towards sdk-style projects. As of now, all code/resources etc. is duplicated for new projects in new folders. this will be moved back to the original locations (and then squashed). App currently does not build.

src/AndroidFileChooserBindingSdkStyle/AndroidFileChooserBindingSdkStyle.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Transforms\EnumFields.xml" />
+    <None Remove="Transforms\EnumMethods.xml" />
+    <None Remove="Transforms\Metadata.xml" />
+  </ItemGroup>
+  <ItemGroup>
+  <AndroidLibrary Include="..\java\android-filechooser-AS\app\build\outputs\aar\android-filechooser-release.aar" Link="android-filechooser-release.aar" />
+  </ItemGroup>
+</Project>

src/AndroidFileChooserBindingSdkStyle/Transforms/EnumFields.xml

@@ -0,0 +1,14 @@
+<enum-field-mappings>
+  <!--
+  This example converts the constants Fragment_id, Fragment_name,
+  and Fragment_tag from android.support.v4.app.FragmentActivity.FragmentTag
+  to an enum called Android.Support.V4.App.FragmentTagType with values
+  Id, Name, and Tag.
+  
+  <mapping jni-class="android/support/v4/app/FragmentActivity$FragmentTag" clr-enum-type="Android.Support.V4.App.FragmentTagType">
+    <field jni-name="Fragment_name" clr-name="Name" value="0" />
+    <field jni-name="Fragment_id" clr-name="Id" value="1" />
+    <field jni-name="Fragment_tag" clr-name="Tag" value="2" />
+  </mapping>
+  -->
+</enum-field-mappings>

src/AndroidFileChooserBindingSdkStyle/Transforms/EnumMethods.xml

@@ -0,0 +1,13 @@
+<enum-method-mappings>
+  <!--
+  This example changes the Java method:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (int flags)
+  to be:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (Android.OS.ParcelableWriteFlags flags)
+  when bound in C#.
+  
+  <mapping jni-class="android/support/v4/app/Fragment.SavedState">
+    <method jni-name="writeToParcel" parameter="flags" clr-enum-type="Android.OS.ParcelableWriteFlags" />
+  </mapping>
+  -->
+</enum-method-mappings>

src/AndroidFileChooserBindingSdkStyle/Transforms/Metadata.xml

@@ -0,0 +1,22 @@
+<metadata>
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser.providers.localfile']/class[@name='FileObserverEx']" />
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser']/class[@name='FragmentFiles']" />
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser.prefs']" />
+
+	
+	<!--
+	
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser']/class[@name='FragmentFiles']" />
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser.utils.ui.bookmark']/class[@name='BookmarkFragment']" />
+	<remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser.utils.ui.history']/class[@name='HistoryFragment']" />
+	
+	
+  <remove-node path="/api/package[@name='group.pals.android.lib.ui.filechooser.prefs']/class[@name='DisplayPrefs']" />
+	
+  This sample removes the class: android.support.v4.content.AsyncTaskLoader.LoadTask:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='AsyncTaskLoader.LoadTask']" />
+  
+  This sample removes the method: android.support.v4.content.CursorLoader.loadInBackground:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='CursorLoader']/method[@name='loadInBackground']" />
+  -->
+</metadata>

src/JavaFileStorageBindingsStkStyle/Additions/AboutAdditions.txt

@@ -0,0 +1,48 @@
+Additions allow you to add arbitrary C# to the generated classes
+before they are compiled.  This can be helpful for providing convenience
+methods or adding pure C# classes.
+
+== Adding Methods to Generated Classes ==
+
+Let's say the library being bound has a Rectangle class with a constructor
+that takes an x and y position, and a width and length size.  It will look like
+this:
+
+public partial class Rectangle
+{
+    public Rectangle (int x, int y, int width, int height)
+    {
+        // JNI bindings
+    }
+}
+
+Imagine we want to add a constructor to this class that takes a Point and
+Size structure instead of 4 ints.  We can add a new file called Rectangle.cs
+with a partial class containing our new method:
+
+public partial class Rectangle
+{
+    public Rectangle (Point location, Size size) :
+        this (location.X, location.Y, size.Width, size.Height)
+    {
+    }
+}
+
+At compile time, the additions class will be added to the generated class
+and the final assembly will a Rectangle class with both constructors.
+
+
+== Adding C# Classes ==
+
+Another thing that can be done is adding fully C# managed classes to the
+generated library.  In the above example, let's assume that there isn't a
+Point class available in Java or our library.  The one we create doesn't need
+to interact with Java, so we'll create it like a normal class in C#.
+
+By adding a Point.cs file with this class, it will end up in the binding library:
+
+public class Point
+{
+    public int X { get; set; }
+    public int Y { get; set; }
+}

src/JavaFileStorageBindingsStkStyle/JavaFileStorageBindingsStkStyle.csproj

@@ -0,0 +1,38 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <AndroidLibrary Include="..\java\JavaFileStorage\app\build\outputs\aar\JavaFileStorage-debug.aar" Link="JavaFileStorage-debug.aar" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidLibrary Bind="False" Update="dropbox-core-sdk-5.4.6.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\commons-logging-1.1.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-api-client-1.30.5.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-api-client-android-1.30.5.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-api-services-drive-v2-rev102-1.16.0-rc.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-http-client-1.32.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-http-client-android-1.32.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-http-client-gson-1.16.0-rc.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-http-client-jackson-1.16.0-rc.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-http-client-jackson2-1.32.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\google-oauth-client-1.30.4.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\grpc-context-1.22.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\httpclient-4.0.3.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\httpcore-4.0.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\httpmime-4.0.3.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\json_simple-1.1.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\jsr305-3.0.2.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\opencensus-api-0.24.0.jar" />
+    <AndroidLibrary Bind="False" Update="gdrive\opencensus-contrib-http-util-0.24.0.jar" />
+    <AndroidLibrary Bind="False" Update="gson-2.8.6.jar" />
+    <AndroidLibrary Bind="False" Update="jackson-core-2.13.5.jar" />
+    <AndroidLibrary Bind="False" Update="okhttp-4.12.0.jar" />
+    <AndroidLibrary Bind="False" Update="okhttp-digest-3.1.0.jar" />
+    <AndroidLibrary Bind="False" Update="okio-3.6.0.jar" />
+    <AndroidLibrary Bind="False" Update="okio-jvm-3.6.0.jar" />
+  </ItemGroup>
+</Project>

src/JavaFileStorageBindingsStkStyle/Transforms/EnumFields.xml

@@ -0,0 +1,14 @@
+<enum-field-mappings>
+  <!--
+  This example converts the constants Fragment_id, Fragment_name,
+  and Fragment_tag from android.support.v4.app.FragmentActivity.FragmentTag
+  to an enum called Android.Support.V4.App.FragmentTagType with values
+  Id, Name, and Tag.
+  
+  <mapping jni-class="android/support/v4/app/FragmentActivity$FragmentTag" clr-enum-type="Android.Support.V4.App.FragmentTagType">
+    <field jni-name="Fragment_name" clr-name="Name" value="0" />
+    <field jni-name="Fragment_id" clr-name="Id" value="1" />
+    <field jni-name="Fragment_tag" clr-name="Tag" value="2" />
+  </mapping>
+  -->
+</enum-field-mappings>

src/JavaFileStorageBindingsStkStyle/Transforms/EnumMethods.xml

@@ -0,0 +1,13 @@
+<enum-method-mappings>
+  <!--
+  This example changes the Java method:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (int flags)
+  to be:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (Android.OS.ParcelableWriteFlags flags)
+  when bound in C#.
+  
+  <mapping jni-class="android/support/v4/app/Fragment.SavedState">
+    <method jni-name="writeToParcel" parameter="flags" clr-enum-type="Android.OS.ParcelableWriteFlags" />
+  </mapping>
+  -->
+</enum-method-mappings>

src/JavaFileStorageBindingsStkStyle/Transforms/Metadata.xml

@@ -0,0 +1,29 @@
+<metadata>
+  <!--
+  This sample removes the class: android.support.v4.content.AsyncTaskLoader.LoadTask:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='AsyncTaskLoader.LoadTask']" />
+  
+  This sample removes the method: android.support.v4.content.CursorLoader.loadInBackground:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='CursorLoader']/method[@name='loadInBackground']" />
+  -->
+	<remove-node path="/api/package[@name='com.jcraft.jsch']" />
+	<remove-node path="/api/package[@name='com.jcraft.jsch.jce']" />
+	<remove-node path="/api/package[@name='com.jcraft.jsch.jcraft']" />
+	<remove-node path="/api/package[@name='com.jcraft.jzlib']" />
+
+  <remove-node path="/api/package[@name='com.pcloud.sdk']" />
+  <remove-node path="/api/package[@name='io.opencensus.stats']" />
+  <remove-node path="/api/package[@name='io.opencensus']" />
+
+
+  <remove-node path="/api/package[@name='com.dropbox.core']" />
+
+  <remove-node path="/api/package[@name='com.dropbox.core']" />
+  <remove-node path="/api/package[@name='com.dropbox.core.util']" />
+  <remove-node path="/api/package[@name='com.dropbox.core.http']" />
+  <remove-node path="/api/package[@name='com.dropbox.core.v2.sharing']" />
+  <remove-node path="/api/package[@name='com.dropbox.core.v2.team']" />
+
+<remove-node path="/api/package[@name='keepass2android.javafilestorage.webdav']" />
+<remove-node path="/api/package[@name='keepass2android.javafilestorage.onedrive']" />
+</metadata>

src/KP2AKdbLibraryBindingSdkStyle/KP2AKdbLibraryBindingSdkStyle.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Transforms\EnumFields.xml" />
+    <None Remove="Transforms\EnumMethods.xml" />
+    <None Remove="Transforms\Metadata.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidLibrary Include="..\java\KP2AKdbLibrary\app\build\outputs\aar\app-debug.aar" Link="app-debug.aar" />
+  </ItemGroup>
+  <ItemGroup>
+    <TransformFile Update="Transforms\Metadata.xml">
+      <SubType>Designer</SubType>
+    </TransformFile>
+  </ItemGroup>
+</Project>

src/KP2AKdbLibraryBindingSdkStyle/Transforms/EnumFields.xml

@@ -0,0 +1,14 @@
+<enum-field-mappings>
+  <!--
+  This example converts the constants Fragment_id, Fragment_name,
+  and Fragment_tag from android.support.v4.app.FragmentActivity.FragmentTag
+  to an enum called Android.Support.V4.App.FragmentTagType with values
+  Id, Name, and Tag.
+  
+  <mapping jni-class="android/support/v4/app/FragmentActivity$FragmentTag" clr-enum-type="Android.Support.V4.App.FragmentTagType">
+    <field jni-name="Fragment_name" clr-name="Name" value="0" />
+    <field jni-name="Fragment_id" clr-name="Id" value="1" />
+    <field jni-name="Fragment_tag" clr-name="Tag" value="2" />
+  </mapping>
+  -->
+</enum-field-mappings>

src/KP2AKdbLibraryBindingSdkStyle/Transforms/EnumMethods.xml

@@ -0,0 +1,13 @@
+<enum-method-mappings>
+  <!--
+  This example changes the Java method:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (int flags)
+  to be:
+    android.support.v4.app.Fragment.SavedState.writeToParcel (Android.OS.ParcelableWriteFlags flags)
+  when bound in C#.
+  
+  <mapping jni-class="android/support/v4/app/Fragment.SavedState">
+    <method jni-name="writeToParcel" parameter="flags" clr-enum-type="Android.OS.ParcelableWriteFlags" />
+  </mapping>
+  -->
+</enum-method-mappings>

src/KP2AKdbLibraryBindingSdkStyle/Transforms/Metadata.xml

@@ -0,0 +1,32 @@
+<metadata>
+  <!--
+  This sample removes the class: android.support.v4.content.AsyncTaskLoader.LoadTask:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='AsyncTaskLoader.LoadTask']" />
+  
+  This sample removes the method: android.support.v4.content.CursorLoader.loadInBackground:
+  <remove-node path="/api/package[@name='android.support.v4.content']/class[@name='CursorLoader']/method[@name='loadInBackground']" />
+  
+  -->
+<remove-node path="/api/package[@name='org.apache.commons.collections']" />
+<remove-node path="/api/package[@name='org.apache.commons.collections.iterators']" />
+<remove-node path="/api/package[@name='org.apache.commons.collections.keyvalue']" />
+<remove-node path="/api/package[@name='org.apache.commons.collections.map']" />
+<remove-node path="/api/package[@name='org.bouncycastle.asn1']" />
+<remove-node path="/api/package[@name='org.bouncycastle.asn1.oiw']" />
+<remove-node path="/api/package[@name='org.bouncycastle.asn1.pkcs']" />
+<remove-node path="/api/package[@name='org.bouncycastle.asn1.util']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.digests']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.engines']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.generators']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.macs']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.modes']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.paddings']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.params']" />
+<remove-node path="/api/package[@name='org.bouncycastle.crypto.util']" />
+<remove-node path="/api/package[@name='org.bouncycastle.jce.interfaces']" />
+<remove-node path="/api/package[@name='org.bouncycastle.jce.provider']" />
+<remove-node path="/api/package[@name='org.bouncycastle.util']" />
+<remove-node path="/api/package[@name='org.bouncycastle.util.encoders']" />
+<remove-node path="/api/package[@name='org.bouncycastle.util.io']" />
+</metadata>

src/KeePass.sln

@@ -29,6 +29,24 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Kp2aAutofillParser", "Kp2aA
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Kp2aAutofillParserTest", "Kp2aAutofillParserTest\Kp2aAutofillParserTest.csproj", "{3D1560FF-86BB-4CB4-8367-80BA13B81C38}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ZlibAndroidSdkStyle", "ZlibAndroidSdkStyle\ZlibAndroidSdkStyle.csproj", "{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TwofishCipherSdkStyle", "TwofishCipherSdkStyle\TwofishCipherSdkStyle.csproj", "{69D491AA-3A31-4467-8216-3641A4F157BE}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "KeePassLib2AndroidSdkStyle", "KeePassLib2AndroidSdkStyle\KeePassLib2AndroidSdkStyle.csproj", "{6E1DCFE1-D86D-480F-BE02-BBE8FD4601F0}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "KP2AKdbLibraryBindingSdkStyle", "KP2AKdbLibraryBindingSdkStyle\KP2AKdbLibraryBindingSdkStyle.csproj", "{BF542E42-E7A9-4C71-AA3B-DAC0F959F0D5}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AndroidFileChooserBindingSdkStyle", "AndroidFileChooserBindingSdkStyle\AndroidFileChooserBindingSdkStyle.csproj", "{C3A88E81-0809-49A4-A4EC-DF71A6200F41}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "JavaFileStorageBindingsStkStyle", "JavaFileStorageBindingsStkStyle\JavaFileStorageBindingsStkStyle.csproj", "{4F2E6B45-2C9F-4DF6-A9DC-9F81DC8681BC}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Kp2aBusinessLogicSdkStyle", "Kp2aBusinessLogicSdkStyle\Kp2aBusinessLogicSdkStyle.csproj", "{862D7A27-4211-4258-A4B0-741B4C0A73CF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Kp2aAutofillParserSdkStyle", "Kp2aAutofillParserSdkStyle\Kp2aAutofillParserSdkStyle.csproj", "{2D5E3AEF-6EB2-4737-9ACB-921A22928682}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "keepass2android-appSdkStyle", "keepass2android-appSdkStyle\keepass2android-appSdkStyle.csproj", "{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -335,6 +353,234 @@ Global
 		{3D1560FF-86BB-4CB4-8367-80BA13B81C38}.ReleaseNoNet|Win32.Build.0 = Release|Any CPU
 		{3D1560FF-86BB-4CB4-8367-80BA13B81C38}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU
 		{3D1560FF-86BB-4CB4-8367-80BA13B81C38}.ReleaseNoNet|x64.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Win32.ActiveCfg = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|Win32.Build.0 = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Debug|x64.Build.0 = Debug|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Mixed Platforms.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Win32.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|Win32.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|x64.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.Release|x64.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Any CPU.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Any CPU.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Mixed Platforms.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Win32.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|Win32.Build.0 = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU
+		{1DF9DA08-D2FE-4227-BD53-761CD3F6CA42}.ReleaseNoNet|x64.Build.0 = Release|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Mixed Platforms.ActiveCfg = Debug|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Win32.ActiveCfg = Debug|Any CPU
+		{69D491AA-3A31-4467-8216-3641A4F157BE}.Debug|Win32.Build.0 = Debug|Any CPU
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+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Any CPU.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Mixed Platforms.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Mixed Platforms.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Win32.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Win32.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|Win32.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|x64.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|x64.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.Release|x64.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Any CPU.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Any CPU.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Any CPU.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Mixed Platforms.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Mixed Platforms.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Mixed Platforms.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Win32.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Win32.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|Win32.Deploy.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|x64.ActiveCfg = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|x64.Build.0 = Release|Any CPU
+		{0CCDA3EB-8A24-4A42-BC91-A4DD254504E7}.ReleaseNoNet|x64.Deploy.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/KeePassLib2Android/KeePassLib2Android.csproj

@@ -32,9 +32,10 @@
     <Optimize>True</Optimize>
     <OutputPath>bin\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
+    <WarningLevel>5</WarningLevel>
     <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
     <ConsolePause>False</ConsolePause>
+    <PlatformTarget>x86</PlatformTarget>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseNoNet|AnyCPU' ">
     <DebugType>none</DebugType>
@@ -149,7 +150,6 @@
     <Compile Include="Serialization\KdbxFile.Write.cs" />
     <Compile Include="Serialization\IOConnectionInfo.cs" />
     <Compile Include="Serialization\OldFormatException.cs" />
-    <Compile Include="Serialization\ProtoBuf\KdbpFile.cs" />
     <Compile Include="Translation\KPStringTable.cs" />
     <Compile Include="Translation\KPStringTableItem.cs" />
     <Compile Include="Translation\KPTranslation.cs" />
@@ -179,5 +179,8 @@
       <Name>KP2AKdbLibraryBinding</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Serialization\ProtoBuf\" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Novell\Novell.MonoDroid.CSharp.targets" />
 </Project>

src/KeePassLib2Android/Utility/UrlUtil.cs

@@ -687,25 +687,6 @@ namespace KeePassLib.Utility
 			return false;
 		}
 
-		public static string GetTempPath()
-		{
-			string strDir;
-			if (NativeLib.IsUnix())
-				strDir = NativeMethods.GetUserRuntimeDir();
-#if KeePassUAP
-			else strDir = Windows.Storage.ApplicationData.Current.TemporaryFolder.Path;
-#else
-			else strDir = Path.GetTempPath();
-#endif
-
-			try
-			{
-				if (!Directory.Exists(strDir)) Directory.CreateDirectory(strDir);
-			}
-			catch (Exception) { Debug.Assert(false); }
-
-			return strDir;
-		}
 
 #if !KeePassLibSD
 		// Structurally mostly equivalent to UrlUtil.GetFileInfos

src/KeePassLib2AndroidSdkStyle/Collections/AutoTypeConfig.cs

@@ -0,0 +1,244 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+using KeePassLib.Interfaces;
+
+namespace KeePassLib.Collections
+{
+	[Flags]
+	public enum AutoTypeObfuscationOptions
+	{
+		None = 0,
+		UseClipboard = 1
+	}
+
+	public sealed class AutoTypeAssociation : IEquatable<AutoTypeAssociation>,
+		IDeepCloneable<AutoTypeAssociation>
+	{
+		private string m_strWindow = string.Empty;
+		public string WindowName
+		{
+			get { return m_strWindow; }
+			set
+			{
+				Debug.Assert(value != null); if(value == null) throw new ArgumentNullException("value");
+				m_strWindow = value;
+			}
+		}
+
+		private string m_strSequence = string.Empty;
+		public string Sequence
+		{
+			get { return m_strSequence; }
+			set
+			{
+				Debug.Assert(value != null); if(value == null) throw new ArgumentNullException("value");
+				m_strSequence = value;
+			}
+		}
+
+		public AutoTypeAssociation() { }
+
+		public AutoTypeAssociation(string strWindow, string strSeq)
+		{
+			if(strWindow == null) throw new ArgumentNullException("strWindow");
+			if(strSeq == null) throw new ArgumentNullException("strSeq");
+
+			m_strWindow = strWindow;
+			m_strSequence = strSeq;
+		}
+
+		public bool Equals(AutoTypeAssociation other)
+		{
+			if(other == null) return false;
+
+			if(m_strWindow != other.m_strWindow) return false;
+			if(m_strSequence != other.m_strSequence) return false;
+
+			return true;
+		}
+
+		public AutoTypeAssociation CloneDeep()
+		{
+			return (AutoTypeAssociation)this.MemberwiseClone();
+		}
+	}
+
+	/// <summary>
+	/// A list of auto-type associations.
+	/// </summary>
+	public sealed class AutoTypeConfig : IEquatable<AutoTypeConfig>,
+		IDeepCloneable<AutoTypeConfig>
+	{
+		private bool m_bEnabled = true;
+		private AutoTypeObfuscationOptions m_atooObfuscation =
+			AutoTypeObfuscationOptions.None;
+		private string m_strDefaultSequence = string.Empty;
+		private List<AutoTypeAssociation> m_lWindowAssocs =
+			new List<AutoTypeAssociation>();
+
+		/// <summary>
+		/// Specify whether auto-type is enabled or not.
+		/// </summary>
+		public bool Enabled
+		{
+			get { return m_bEnabled; }
+			set { m_bEnabled = value; }
+		}
+
+		/// <summary>
+		/// Specify whether the typing should be obfuscated.
+		/// </summary>
+		public AutoTypeObfuscationOptions ObfuscationOptions
+		{
+			get { return m_atooObfuscation; }
+			set { m_atooObfuscation = value; }
+		}
+
+		/// <summary>
+		/// The default keystroke sequence that is auto-typed if
+		/// no matching window is found in the <c>Associations</c>
+		/// container.
+		/// </summary>
+		public string DefaultSequence
+		{
+			get { return m_strDefaultSequence; }
+			set
+			{
+				Debug.Assert(value != null); if(value == null) throw new ArgumentNullException("value");
+				m_strDefaultSequence = value;
+			}
+		}
+
+		/// <summary>
+		/// Get all auto-type window/keystroke sequence pairs.
+		/// </summary>
+		public IEnumerable<AutoTypeAssociation> Associations
+		{
+			get { return m_lWindowAssocs; }
+		}
+
+		public int AssociationsCount
+		{
+			get { return m_lWindowAssocs.Count; }
+		}
+
+		/// <summary>
+		/// Construct a new auto-type associations list.
+		/// </summary>
+		public AutoTypeConfig()
+		{
+		}
+
+		/// <summary>
+		/// Remove all associations.
+		/// </summary>
+		public void Clear()
+		{
+			m_lWindowAssocs.Clear();
+		}
+
+		/// <summary>
+		/// Clone the auto-type associations list.
+		/// </summary>
+		/// <returns>New, cloned object.</returns>
+		public AutoTypeConfig CloneDeep()
+		{
+			AutoTypeConfig newCfg = new AutoTypeConfig();
+
+			newCfg.m_bEnabled = m_bEnabled;
+			newCfg.m_atooObfuscation = m_atooObfuscation;
+			newCfg.m_strDefaultSequence = m_strDefaultSequence;
+
+			foreach(AutoTypeAssociation a in m_lWindowAssocs)
+				newCfg.Add(a.CloneDeep());
+
+			return newCfg;
+		}
+
+		public bool Equals(AutoTypeConfig other)
+		{
+			if(other == null) { Debug.Assert(false); return false; }
+
+			if(m_bEnabled != other.m_bEnabled) return false;
+			if(m_atooObfuscation != other.m_atooObfuscation) return false;
+			if(m_strDefaultSequence != other.m_strDefaultSequence) return false;
+
+			if(m_lWindowAssocs.Count != other.m_lWindowAssocs.Count) return false;
+			for(int i = 0; i < m_lWindowAssocs.Count; ++i)
+			{
+				if(!m_lWindowAssocs[i].Equals(other.m_lWindowAssocs[i]))
+					return false;
+			}
+
+			return true;
+		}
+
+		public AutoTypeAssociation GetAt(int iIndex)
+		{
+			if((iIndex < 0) || (iIndex >= m_lWindowAssocs.Count))
+				throw new ArgumentOutOfRangeException("iIndex");
+
+			return m_lWindowAssocs[iIndex];
+		}
+
+		public void Add(AutoTypeAssociation a)
+		{
+			if(a == null) { Debug.Assert(false); throw new ArgumentNullException("a"); }
+
+			m_lWindowAssocs.Add(a);
+		}
+
+		public void Insert(int iIndex, AutoTypeAssociation a)
+		{
+			if((iIndex < 0) || (iIndex > m_lWindowAssocs.Count))
+				throw new ArgumentOutOfRangeException("iIndex");
+			if(a == null) { Debug.Assert(false); throw new ArgumentNullException("a"); }
+
+			m_lWindowAssocs.Insert(iIndex, a);
+		}
+
+		public void RemoveAt(int iIndex)
+		{
+			if((iIndex < 0) || (iIndex >= m_lWindowAssocs.Count))
+				throw new ArgumentOutOfRangeException("iIndex");
+
+			m_lWindowAssocs.RemoveAt(iIndex);
+		}
+
+		// public void Sort()
+		// {
+		//	m_lWindowAssocs.Sort(AutoTypeConfig.AssocCompareFn);
+		// }
+
+		// private static int AssocCompareFn(AutoTypeAssociation x,
+		//	AutoTypeAssociation y)
+		// {
+		//	if(x == null) { Debug.Assert(false); return ((y == null) ? 0 : -1); }
+		//	if(y == null) { Debug.Assert(false); return 1; }
+		//	int cn = x.WindowName.CompareTo(y.WindowName);
+		//	if(cn != 0) return cn;
+		//	return x.Sequence.CompareTo(y.Sequence);
+		// }
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/ProtectedBinaryDictionary.cs

@@ -0,0 +1,178 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Interfaces;
+using KeePassLib.Security;
+
+#if KeePassLibSD
+using KeePassLibSD;
+#endif
+
+namespace KeePassLib.Collections
+{
+	/// <summary>
+	/// A list of <c>ProtectedBinary</c> objects (dictionary).
+	/// </summary>
+	public sealed class ProtectedBinaryDictionary :
+		IDeepCloneable<ProtectedBinaryDictionary>,
+		IEnumerable<KeyValuePair<string, ProtectedBinary>>
+	{
+		/*
+		private SortedDictionary<string, ProtectedBinary> m_vBinaries =
+			new SortedDictionary<string, ProtectedBinary>();
+		*/
+
+		private Dictionary<string, ProtectedBinary> m_vBinaries =
+			new Dictionary<string, ProtectedBinary>();
+
+
+		/// <summary>
+		/// Get the number of binaries in this entry.
+		/// </summary>
+		public uint UCount
+		{
+			get { return (uint)m_vBinaries.Count; }
+		}
+
+		/// <summary>
+		/// Construct a new list of protected binaries.
+		/// </summary>
+		public ProtectedBinaryDictionary()
+		{
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vBinaries.GetEnumerator();
+		}
+
+		public IEnumerator<KeyValuePair<string, ProtectedBinary>> GetEnumerator()
+		{
+			return m_vBinaries.GetEnumerator();
+		}
+
+		public void Clear()
+		{
+			m_vBinaries.Clear();
+		}
+
+		/// <summary>
+		/// Clone the current <c>ProtectedBinaryList</c> object, including all
+		/// stored protected strings.
+		/// </summary>
+		/// <returns>New <c>ProtectedBinaryList</c> object.</returns>
+		public ProtectedBinaryDictionary CloneDeep()
+		{
+			ProtectedBinaryDictionary plNew = new ProtectedBinaryDictionary();
+
+			foreach(KeyValuePair<string, ProtectedBinary> kvpBin in m_vBinaries)
+			{
+				// ProtectedBinary objects are immutable
+				plNew.Set(kvpBin.Key, kvpBin.Value);
+			}
+
+			return plNew;
+		}
+
+		public bool EqualsDictionary(ProtectedBinaryDictionary dict)
+		{
+			if(dict == null) { Debug.Assert(false); return false; }
+
+			if(m_vBinaries.Count != dict.m_vBinaries.Count) return false;
+
+			foreach(KeyValuePair<string, ProtectedBinary> kvp in m_vBinaries)
+			{
+				ProtectedBinary pb = dict.Get(kvp.Key);
+				if(pb == null) return false;
+				if(!pb.Equals(kvp.Value)) return false;
+			}
+
+			return true;
+		}
+
+		/// <summary>
+		/// Get one of the stored binaries.
+		/// </summary>
+		/// <param name="strName">Binary identifier.</param>
+		/// <returns>Protected binary. If the binary identified by
+		/// <paramref name="strName" /> cannot be found, the function
+		/// returns <c>null</c>.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public ProtectedBinary Get(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			ProtectedBinary pb;
+			if(m_vBinaries.TryGetValue(strName, out pb)) return pb;
+
+			return null;
+		}
+
+		/// <summary>
+		/// Set a binary object.
+		/// </summary>
+		/// <param name="strField">Identifier of the binary field to modify.</param>
+		/// <param name="pbNewValue">New value. This parameter must not be <c>null</c>.</param>
+		/// <exception cref="System.ArgumentNullException">Thrown if any of the input
+		/// parameters is <c>null</c>.</exception>
+		public void Set(string strField, ProtectedBinary pbNewValue)
+		{
+			Debug.Assert(strField != null); if(strField == null) throw new ArgumentNullException("strField");
+			Debug.Assert(pbNewValue != null); if(pbNewValue == null) throw new ArgumentNullException("pbNewValue");
+
+			m_vBinaries[strField] = pbNewValue;
+		}
+
+		/// <summary>
+		/// Remove a binary object.
+		/// </summary>
+		/// <param name="strField">Identifier of the binary field to remove.</param>
+		/// <returns>Returns <c>true</c> if the object has been successfully
+		/// removed, otherwise <c>false</c>.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input parameter
+		/// is <c>null</c>.</exception>
+		public bool Remove(string strField)
+		{
+			Debug.Assert(strField != null); if(strField == null) throw new ArgumentNullException("strField");
+
+			return m_vBinaries.Remove(strField);
+		}
+
+		public string KeysToString()
+		{
+			if(m_vBinaries.Count == 0) return string.Empty;
+
+			StringBuilder sb = new StringBuilder();
+			foreach(KeyValuePair<string, ProtectedBinary> kvp in m_vBinaries)
+			{
+				if(sb.Length > 0) sb.Append(", ");
+				sb.Append(kvp.Key);
+			}
+
+			return sb.ToString();
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/ProtectedBinarySet.cs

@@ -0,0 +1,170 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Delegates;
+using KeePassLib.Security;
+
+namespace KeePassLib.Collections
+{
+	internal sealed class ProtectedBinarySet : IEnumerable<KeyValuePair<int, ProtectedBinary>>
+	{
+		private Dictionary<int, ProtectedBinary> m_d =
+			new Dictionary<int, ProtectedBinary>();
+
+		private readonly bool m_bDedupAdd;
+
+		public ProtectedBinarySet(bool bDedupAdd)
+		{
+			m_bDedupAdd = bDedupAdd;
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_d.GetEnumerator();
+		}
+
+		public IEnumerator<KeyValuePair<int, ProtectedBinary>> GetEnumerator()
+		{
+			return m_d.GetEnumerator();
+		}
+
+		private int GetFreeID()
+		{
+			int i = m_d.Count;
+			while (m_d.ContainsKey(i)) { ++i; }
+			Debug.Assert(i == m_d.Count); // m_d.Count should be free
+			return i;
+		}
+
+		public ProtectedBinary Get(int iID)
+		{
+			ProtectedBinary pb;
+			if (m_d.TryGetValue(iID, out pb)) return pb;
+
+			// Debug.Assert(false); // No assert
+			return null;
+		}
+
+		public int Find(ProtectedBinary pb)
+		{
+			if (pb == null) { Debug.Assert(false); return -1; }
+
+			// Fast search by reference
+			foreach (KeyValuePair<int, ProtectedBinary> kvp in m_d)
+			{
+				if (object.ReferenceEquals(pb, kvp.Value))
+				{
+					Debug.Assert(pb.Equals(kvp.Value));
+					return kvp.Key;
+				}
+			}
+
+			// Slow search by content
+			foreach (KeyValuePair<int, ProtectedBinary> kvp in m_d)
+			{
+				if (pb.Equals(kvp.Value)) return kvp.Key;
+			}
+
+			// Debug.Assert(false); // No assert
+			return -1;
+		}
+
+		public void Set(int iID, ProtectedBinary pb)
+		{
+			if (iID < 0) { Debug.Assert(false); return; }
+			if (pb == null) { Debug.Assert(false); return; }
+
+			m_d[iID] = pb;
+		}
+
+		public void Add(ProtectedBinary pb)
+		{
+			if (pb == null) { Debug.Assert(false); return; }
+
+			if (m_bDedupAdd && (Find(pb) >= 0)) return; // Exists already
+
+			m_d[GetFreeID()] = pb;
+		}
+
+		public void AddFrom(ProtectedBinaryDictionary d)
+		{
+			if (d == null) { Debug.Assert(false); return; }
+
+			foreach (KeyValuePair<string, ProtectedBinary> kvp in d)
+			{
+				Add(kvp.Value);
+			}
+		}
+
+		public void AddFrom(PwGroup pg)
+		{
+			if (pg == null) { Debug.Assert(false); return; }
+
+			EntryHandler eh = delegate (PwEntry pe)
+			{
+				if (pe == null) { Debug.Assert(false); return true; }
+
+				AddFrom(pe.Binaries);
+				foreach (PwEntry peHistory in pe.History)
+				{
+					if (peHistory == null) { Debug.Assert(false); continue; }
+					AddFrom(peHistory.Binaries);
+				}
+
+				return true;
+			};
+
+			pg.TraverseTree(TraversalMethod.PreOrder, null, eh);
+		}
+
+		public ProtectedBinary[] ToArray()
+		{
+			int n = m_d.Count;
+			ProtectedBinary[] v = new ProtectedBinary[n];
+
+			foreach (KeyValuePair<int, ProtectedBinary> kvp in m_d)
+			{
+				if ((kvp.Key < 0) || (kvp.Key >= n))
+				{
+					Debug.Assert(false);
+					throw new InvalidOperationException();
+				}
+
+				v[kvp.Key] = kvp.Value;
+			}
+
+			for (int i = 0; i < n; ++i)
+			{
+				if (v[i] == null)
+				{
+					Debug.Assert(false);
+					throw new InvalidOperationException();
+				}
+			}
+
+			return v;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/ProtectedStringDictionary.cs

@@ -0,0 +1,304 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Interfaces;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+#if KeePassLibSD
+using KeePassLibSD;
+#endif
+
+namespace KeePassLib.Collections
+{
+	/// <summary>
+	/// A list of <c>ProtectedString</c> objects (dictionary).
+	/// </summary>
+	public sealed class ProtectedStringDictionary :
+		IDeepCloneable<ProtectedStringDictionary>,
+		IEnumerable<KeyValuePair<string, ProtectedString>>
+	{
+		/*private SortedDictionary<string, ProtectedString> m_vStrings =
+			new SortedDictionary<string, ProtectedString>();*/
+		private Dictionary<string, ProtectedString> m_vStrings = new Dictionary<string, ProtectedString>();
+
+		/// <summary>
+		/// Get the number of strings in this entry.
+		/// </summary>
+		public uint UCount
+		{
+			get { return (uint)m_vStrings.Count; }
+		}
+
+		/// <summary>
+		/// Construct a new list of protected strings.
+		/// </summary>
+		public ProtectedStringDictionary()
+		{
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vStrings.GetEnumerator();
+		}
+
+		public IEnumerator<KeyValuePair<string, ProtectedString>> GetEnumerator()
+		{
+			return m_vStrings.GetEnumerator();
+		}
+
+		public void Clear()
+		{
+			m_vStrings.Clear();
+		}
+
+		/// <summary>
+		/// Clone the current <c>ProtectedStringList</c> object, including all
+		/// stored protected strings.
+		/// </summary>
+		/// <returns>New <c>ProtectedStringList</c> object.</returns>
+		public ProtectedStringDictionary CloneDeep()
+		{
+			ProtectedStringDictionary plNew = new ProtectedStringDictionary();
+
+			foreach(KeyValuePair<string, ProtectedString> kvpStr in m_vStrings)
+			{
+				// ProtectedString objects are immutable
+				plNew.Set(kvpStr.Key, kvpStr.Value);
+			}
+
+			return plNew;
+		}
+
+		[Obsolete]
+		public bool EqualsDictionary(ProtectedStringDictionary dict)
+		{
+			return EqualsDictionary(dict, PwCompareOptions.None, MemProtCmpMode.None);
+		}
+
+		[Obsolete]
+		public bool EqualsDictionary(ProtectedStringDictionary dict,
+			MemProtCmpMode mpCompare)
+		{
+			return EqualsDictionary(dict, PwCompareOptions.None, mpCompare);
+		}
+
+		public bool EqualsDictionary(ProtectedStringDictionary dict,
+			PwCompareOptions pwOpt, MemProtCmpMode mpCompare)
+		{
+			if(dict == null) { Debug.Assert(false); return false; }
+
+			bool bNeEqStd = ((pwOpt & PwCompareOptions.NullEmptyEquivStd) !=
+				PwCompareOptions.None);
+			if(!bNeEqStd)
+			{
+				if(m_vStrings.Count != dict.m_vStrings.Count) return false;
+			}
+
+			foreach(KeyValuePair<string, ProtectedString> kvp in m_vStrings)
+			{
+				bool bStdField = PwDefs.IsStandardField(kvp.Key);
+				ProtectedString ps = dict.Get(kvp.Key);
+
+				if(bNeEqStd && (ps == null) && bStdField)
+					ps = ProtectedString.Empty;
+
+				if(ps == null) return false;
+
+				if(mpCompare == MemProtCmpMode.Full)
+				{
+					if(ps.IsProtected != kvp.Value.IsProtected) return false;
+				}
+				else if(mpCompare == MemProtCmpMode.CustomOnly)
+				{
+					if(!bStdField && (ps.IsProtected != kvp.Value.IsProtected))
+						return false;
+				}
+
+				if(ps.ReadString() != kvp.Value.ReadString()) return false;
+			}
+
+			if(bNeEqStd)
+			{
+				foreach(KeyValuePair<string, ProtectedString> kvp in dict.m_vStrings)
+				{
+					ProtectedString ps = Get(kvp.Key);
+
+					if(ps != null) continue; // Compared previously
+					if(!PwDefs.IsStandardField(kvp.Key)) return false;
+					if(!kvp.Value.IsEmpty) return false;
+				}
+			}
+
+			return true;
+		}
+
+		/// <summary>
+		/// Get one of the protected strings.
+		/// </summary>
+		/// <param name="strName">String identifier.</param>
+		/// <returns>Protected string. If the string identified by
+		/// <paramref name="strName" /> cannot be found, the function
+		/// returns <c>null</c>.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input parameter
+		/// is <c>null</c>.</exception>
+		public ProtectedString Get(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			ProtectedString ps;
+			if(m_vStrings.TryGetValue(strName, out ps)) return ps;
+
+			return null;
+		}
+
+		/// <summary>
+		/// Get one of the protected strings. The return value is never <c>null</c>.
+		/// If the requested string cannot be found, an empty protected string
+		/// object is returned.
+		/// </summary>
+		/// <param name="strName">String identifier.</param>
+		/// <returns>Returns a protected string object. If the standard string
+		/// has not been set yet, the return value is an empty string (<c>""</c>).</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public ProtectedString GetSafe(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			ProtectedString ps;
+			if(m_vStrings.TryGetValue(strName, out ps)) return ps;
+
+			return ProtectedString.Empty;
+		}
+
+		/// <summary>
+		/// Test if a named string exists.
+		/// </summary>
+		/// <param name="strName">Name of the string to try.</param>
+		/// <returns>Returns <c>true</c> if the string exists, otherwise <c>false</c>.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if
+		/// <paramref name="strName" /> is <c>null</c>.</exception>
+		public bool Exists(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			return m_vStrings.ContainsKey(strName);
+		}
+
+		/// <summary>
+		/// Get one of the protected strings. If the string doesn't exist, the
+		/// return value is an empty string (<c>""</c>).
+		/// </summary>
+		/// <param name="strName">Name of the requested string.</param>
+		/// <returns>Requested string value or an empty string, if the named
+		/// string doesn't exist.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public string ReadSafe(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			ProtectedString ps;
+			if(m_vStrings.TryGetValue(strName, out ps))
+				return ps.ReadString();
+
+			return string.Empty;
+		}
+
+		/// <summary>
+		/// Get one of the entry strings. If the string doesn't exist, the
+		/// return value is an empty string (<c>""</c>). If the string is
+		/// in-memory protected, the return value is <c>PwDefs.HiddenPassword</c>.
+		/// </summary>
+		/// <param name="strName">Name of the requested string.</param>
+		/// <returns>Returns the requested string in plain-text or
+		/// <c>PwDefs.HiddenPassword</c> if the string cannot be found.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public string ReadSafeEx(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			ProtectedString ps;
+			if(m_vStrings.TryGetValue(strName, out ps))
+			{
+				if(ps.IsProtected) return PwDefs.HiddenPassword;
+				return ps.ReadString();
+			}
+
+			return string.Empty;
+		}
+
+		/// <summary>
+		/// Set a string.
+		/// </summary>
+		/// <param name="strField">Identifier of the string field to modify.</param>
+		/// <param name="psNewValue">New value. This parameter must not be <c>null</c>.</param>
+		/// <exception cref="System.ArgumentNullException">Thrown if one of the input
+		/// parameters is <c>null</c>.</exception>
+		public void Set(string strField, ProtectedString psNewValue)
+		{
+			Debug.Assert(strField != null); if(strField == null) throw new ArgumentNullException("strField");
+			Debug.Assert(psNewValue != null); if(psNewValue == null) throw new ArgumentNullException("psNewValue");
+
+			m_vStrings[strField] = psNewValue;
+		}
+
+		/// <summary>
+		/// Delete a string.
+		/// </summary>
+		/// <param name="strField">Name of the string field to delete.</param>
+		/// <returns>Returns <c>true</c> if the field has been successfully
+		/// removed, otherwise the return value is <c>false</c>.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public bool Remove(string strField)
+		{
+			Debug.Assert(strField != null); if(strField == null) throw new ArgumentNullException("strField");
+
+			return m_vStrings.Remove(strField);
+		}
+
+		public List<string> GetKeys()
+		{
+			return new List<string>(m_vStrings.Keys);
+		}
+
+		public void EnableProtection(string strField, bool bProtect)
+		{
+			ProtectedString ps = Get(strField);
+			if(ps == null) return; // Nothing to do, no assert
+
+			if(ps.IsProtected != bProtect)
+			{
+				byte[] pbData = ps.ReadUtf8();
+				Set(strField, new ProtectedString(bProtect, pbData));
+
+				if(bProtect) MemUtil.ZeroByteArray(pbData);
+			}
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/PwObjectList.cs

@@ -0,0 +1,373 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+using KeePassLib.Interfaces;
+
+namespace KeePassLib.Collections
+{
+	/// <summary>
+	/// List of objects that implement <c>IDeepCloneable</c>,
+	/// and cannot be <c>null</c>.
+	/// </summary>
+	/// <typeparam name="T">Type specifier.</typeparam>
+	public sealed class PwObjectList<T> : IEnumerable<T>
+		where T : class, IDeepCloneable<T>
+	{
+		private List<T> m_vObjects = new List<T>();
+
+		/// <summary>
+		/// Get number of objects in this list.
+		/// </summary>
+		public uint UCount
+		{
+			get { return (uint)m_vObjects.Count; }
+		}
+
+		/// <summary>
+		/// Construct a new list of objects.
+		/// </summary>
+		public PwObjectList()
+		{
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vObjects.GetEnumerator();
+		}
+
+		public IEnumerator<T> GetEnumerator()
+		{
+			return m_vObjects.GetEnumerator();
+		}
+
+		public void Clear()
+		{
+			// Do not destroy contained objects!
+			m_vObjects.Clear();
+		}
+
+		/// <summary>
+		/// Clone the current <c>PwObjectList</c>, including all
+		/// stored objects (deep copy).
+		/// </summary>
+		/// <returns>New <c>PwObjectList</c>.</returns>
+		public PwObjectList<T> CloneDeep()
+		{
+			PwObjectList<T> pl = new PwObjectList<T>();
+
+			foreach(T po in m_vObjects)
+				pl.Add(po.CloneDeep());
+
+			return pl;
+		}
+
+		public PwObjectList<T> CloneShallow()
+		{
+			PwObjectList<T> tNew = new PwObjectList<T>();
+
+			foreach(T po in m_vObjects) tNew.Add(po);
+
+			return tNew;
+		}
+
+		public List<T> CloneShallowToList()
+		{
+			PwObjectList<T> tNew = CloneShallow();
+			return tNew.m_vObjects;
+		}
+
+		/// <summary>
+		/// Add an object to this list.
+		/// </summary>
+		/// <param name="pwObject">Object to be added.</param>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public void Add(T pwObject)
+		{
+			Debug.Assert(pwObject != null);
+			if(pwObject == null) throw new ArgumentNullException("pwObject");
+
+			m_vObjects.Add(pwObject);
+		}
+
+		public void Add(PwObjectList<T> vObjects)
+		{
+			Debug.Assert(vObjects != null);
+			if(vObjects == null) throw new ArgumentNullException("vObjects");
+
+			foreach(T po in vObjects)
+			{
+				m_vObjects.Add(po);
+			}
+		}
+
+		public void Add(List<T> vObjects)
+		{
+			Debug.Assert(vObjects != null);
+			if(vObjects == null) throw new ArgumentNullException("vObjects");
+
+			foreach(T po in vObjects)
+			{
+				m_vObjects.Add(po);
+			}
+		}
+
+		public void Insert(uint uIndex, T pwObject)
+		{
+			Debug.Assert(pwObject != null);
+			if(pwObject == null) throw new ArgumentNullException("pwObject");
+
+			m_vObjects.Insert((int)uIndex, pwObject);
+		}
+
+		/// <summary>
+		/// Get an object of the list.
+		/// </summary>
+		/// <param name="uIndex">Index of the object to get. Must be valid, otherwise an
+		/// exception is thrown.</param>
+		/// <returns>Reference to an existing <c>T</c> object. Is never <c>null</c>.</returns>
+		public T GetAt(uint uIndex)
+		{
+			Debug.Assert(uIndex < m_vObjects.Count);
+			if(uIndex >= m_vObjects.Count) throw new ArgumentOutOfRangeException("uIndex");
+
+			return m_vObjects[(int)uIndex];
+		}
+
+		public void SetAt(uint uIndex, T pwObject)
+		{
+			Debug.Assert(pwObject != null);
+			if(pwObject == null) throw new ArgumentNullException("pwObject");
+			if(uIndex >= (uint)m_vObjects.Count)
+				throw new ArgumentOutOfRangeException("uIndex");
+
+			m_vObjects[(int)uIndex] = pwObject;
+		}
+
+		/// <summary>
+		/// Get a range of objects.
+		/// </summary>
+		/// <param name="uStartIndexIncl">Index of the first object to be
+		/// returned (inclusive).</param>
+		/// <param name="uEndIndexIncl">Index of the last object to be
+		/// returned (inclusive).</param>
+		/// <returns></returns>
+		public List<T> GetRange(uint uStartIndexIncl, uint uEndIndexIncl)
+		{
+			if(uStartIndexIncl >= (uint)m_vObjects.Count)
+				throw new ArgumentOutOfRangeException("uStartIndexIncl");
+			if(uEndIndexIncl >= (uint)m_vObjects.Count)
+				throw new ArgumentOutOfRangeException("uEndIndexIncl");
+			if(uStartIndexIncl > uEndIndexIncl)
+				throw new ArgumentException();
+
+			List<T> list = new List<T>((int)(uEndIndexIncl - uStartIndexIncl) + 1);
+			for(uint u = uStartIndexIncl; u <= uEndIndexIncl; ++u)
+			{
+				list.Add(m_vObjects[(int)u]);
+			}
+
+			return list;
+		}
+
+		public int IndexOf(T pwReference)
+		{
+			Debug.Assert(pwReference != null); if(pwReference == null) throw new ArgumentNullException("pwReference");
+
+			return m_vObjects.IndexOf(pwReference);
+		}
+
+		/// <summary>
+		/// Delete an object of this list. The object to be deleted is identified
+		/// by a reference handle.
+		/// </summary>
+		/// <param name="pwReference">Reference of the object to be deleted.</param>
+		/// <returns>Returns <c>true</c> if the object was deleted, <c>false</c> if
+		/// the object wasn't found in this list.</returns>
+		/// <exception cref="System.ArgumentNullException">Thrown if the input
+		/// parameter is <c>null</c>.</exception>
+		public bool Remove(T pwReference)
+		{
+			Debug.Assert(pwReference != null); if(pwReference == null) throw new ArgumentNullException("pwReference");
+
+			return m_vObjects.Remove(pwReference);
+		}
+
+		public void RemoveAt(uint uIndex)
+		{
+			m_vObjects.RemoveAt((int)uIndex);
+		}
+
+		/// <summary>
+		/// Move an object up or down.
+		/// </summary>
+		/// <param name="tObject">The object to be moved.</param>
+		/// <param name="bUp">Move one up. If <c>false</c>, move one down.</param>
+		public void MoveOne(T tObject, bool bUp)
+		{
+			Debug.Assert(tObject != null);
+			if(tObject == null) throw new ArgumentNullException("tObject");
+
+			int nCount = m_vObjects.Count;
+			if(nCount <= 1) return;
+
+			int nIndex = m_vObjects.IndexOf(tObject);
+			if(nIndex < 0) { Debug.Assert(false); return; }
+
+			if(bUp && (nIndex > 0)) // No assert for top item
+			{
+				T tTemp = m_vObjects[nIndex - 1];
+				m_vObjects[nIndex - 1] = m_vObjects[nIndex];
+				m_vObjects[nIndex] = tTemp;
+			}
+			else if(!bUp && (nIndex != (nCount - 1))) // No assert for bottom item
+			{
+				T tTemp = m_vObjects[nIndex + 1];
+				m_vObjects[nIndex + 1] = m_vObjects[nIndex];
+				m_vObjects[nIndex] = tTemp;
+			}
+		}
+
+		public void MoveOne(T[] vObjects, bool bUp)
+		{
+			Debug.Assert(vObjects != null);
+			if(vObjects == null) throw new ArgumentNullException("vObjects");
+		/// <summary>
+			List<int> lIndices = new List<int>();
+			foreach(T t in vObjects)
+			{
+				if(t == null) { Debug.Assert(false); continue; }
+		/// Move some of the objects in this list to the top/bottom.
+				int p = IndexOf(t);
+				if(p >= 0) lIndices.Add(p);
+				else { Debug.Assert(false); }
+			}
+		/// </summary>
+			MoveOne(lIndices.ToArray(), bUp);
+		}
+		/// <param name="vObjects">List of objects to be moved.</param>
+		public void MoveOne(int[] vIndices, bool bUp)
+		{
+			Debug.Assert(vIndices != null);
+			if(vIndices == null) throw new ArgumentNullException("vIndices");
+		/// <param name="bTop">Move to top. If <c>false</c>, move to bottom.</param>
+			int n = m_vObjects.Count;
+			if(n <= 1) return; // No moving possible
+
+			int m = vIndices.Length;
+			if(m == 0) return; // Nothing to move
+
+			int[] v = new int[m];
+			Array.Copy(vIndices, v, m);
+			Array.Sort<int>(v);
+
+			if((bUp && (v[0] <= 0)) || (!bUp && (v[m - 1] >= (n - 1))))
+				return; // Moving as a block is not possible
+
+			int iStart = (bUp ? 0 : (m - 1));
+			int iExcl = (bUp ? m : -1);
+			int iStep = (bUp ? 1 : -1);
+
+			for(int i = iStart; i != iExcl; i += iStep)
+			{
+				int p = v[i];
+				if((p < 0) || (p >= n)) { Debug.Assert(false); continue; }
+
+				T t = m_vObjects[p];
+
+				if(bUp)
+				{
+					Debug.Assert(p > 0);
+					m_vObjects.RemoveAt(p);
+					m_vObjects.Insert(p - 1, t);
+				}
+				else // Down
+				{
+					Debug.Assert(p < (n - 1));
+					m_vObjects.RemoveAt(p);
+					m_vObjects.Insert(p + 1, t);
+				}
+			}
+		}
+
+		/// <summary>
+		/// Move some of the objects in this list to the top/bottom.
+		/// </summary>
+		/// <param name="vObjects">List of objects to be moved.</param>
+		/// <param name="bTop">Move to top. If <c>false</c>, move to bottom.</param>
+		public void MoveTopBottom(T[] vObjects, bool bTop)
+		{
+			Debug.Assert(vObjects != null);
+			if(vObjects == null) throw new ArgumentNullException("vObjects");
+
+			if(vObjects.Length == 0) return;
+
+			int nCount = m_vObjects.Count;
+			foreach(T t in vObjects) m_vObjects.Remove(t);
+
+			if(bTop)
+			{
+				int nPos = 0;
+				foreach(T t in vObjects)
+				{
+					m_vObjects.Insert(nPos, t);
+					++nPos;
+				}
+			}
+			else // Move to bottom
+			{
+				foreach(T t in vObjects) m_vObjects.Add(t);
+			}
+
+			Debug.Assert(nCount == m_vObjects.Count);
+			if(nCount != m_vObjects.Count)
+				throw new ArgumentException("At least one of the T objects in the vObjects list doesn't exist!");
+		}
+
+		public void Sort(IComparer<T> tComparer)
+		{
+			if(tComparer == null) throw new ArgumentNullException("tComparer");
+
+			m_vObjects.Sort(tComparer);
+		}
+
+		public static PwObjectList<T> FromArray(T[] tArray)
+		{
+			if(tArray == null) throw new ArgumentNullException("tArray");
+
+			PwObjectList<T> l = new PwObjectList<T>();
+			foreach(T t in tArray) { l.Add(t); }
+			return l;
+		}
+
+		public static PwObjectList<T> FromList(List<T> tList)
+		{
+			if(tList == null) throw new ArgumentNullException("tList");
+
+			PwObjectList<T> l = new PwObjectList<T>();
+			l.Add(tList);
+			return l;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/PwObjectPool.cs

@@ -0,0 +1,232 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Delegates;
+using KeePassLib.Interfaces;
+using KeePassLib.Utility;
+
+#if KeePassLibSD
+using KeePassLibSD;
+#endif
+
+namespace KeePassLib.Collections
+{
+	public sealed class PwObjectPool
+	{
+		private SortedDictionary<PwUuid, IStructureItem> m_dict =
+			new SortedDictionary<PwUuid, IStructureItem>();
+
+		public static PwObjectPool FromGroupRecursive(PwGroup pgRoot, bool bEntries)
+		{
+			if(pgRoot == null) throw new ArgumentNullException("pgRoot");
+
+			PwObjectPool p = new PwObjectPool();
+
+			if(!bEntries) p.m_dict[pgRoot.Uuid] = pgRoot;
+			GroupHandler gh = delegate(PwGroup pg)
+			{
+				p.m_dict[pg.Uuid] = pg;
+				return true;
+			};
+
+			EntryHandler eh = delegate(PwEntry pe)
+			{
+				p.m_dict[pe.Uuid] = pe;
+				return true;
+			};
+
+			pgRoot.TraverseTree(TraversalMethod.PreOrder, bEntries ? null : gh,
+				bEntries ? eh : null);
+			return p;
+		}
+
+		public IStructureItem Get(PwUuid pwUuid)
+		{
+			IStructureItem pItem;
+			m_dict.TryGetValue(pwUuid, out pItem);
+			return pItem;
+		}
+
+		public bool ContainsOnlyType(Type t)
+		{
+			foreach(KeyValuePair<PwUuid, IStructureItem> kvp in m_dict)
+			{
+				if(kvp.Value.GetType() != t) return false;
+			}
+
+			return true;
+		}
+	}
+
+	internal sealed class PwObjectPoolEx
+	{
+		private Dictionary<PwUuid, ulong> m_dUuidToId =
+			new Dictionary<PwUuid, ulong>();
+		private Dictionary<ulong, IStructureItem> m_dIdToItem =
+			new Dictionary<ulong, IStructureItem>();
+
+		private PwObjectPoolEx()
+		{
+}
+
+		public static PwObjectPoolEx FromGroup(PwGroup pg)
+		{
+			PwObjectPoolEx p = new PwObjectPoolEx();
+
+			if(pg == null) { Debug.Assert(false); return p; }
+
+			ulong uFreeId = 2; // 0 = "not found", 1 is a hole
+
+			p.m_dUuidToId[pg.Uuid] = uFreeId;
+			p.m_dIdToItem[uFreeId] = pg;
+			uFreeId += 2; // Make hole
+
+			p.AddGroupRec(pg, ref uFreeId);
+			return p;
+		}
+
+		private void AddGroupRec(PwGroup pg, ref ulong uFreeId)
+		{
+			if(pg == null) { Debug.Assert(false); return; }
+
+			ulong uId = uFreeId;
+
+			// Consecutive entries must have consecutive IDs
+			foreach(PwEntry pe in pg.Entries)
+			{
+				Debug.Assert(!m_dUuidToId.ContainsKey(pe.Uuid));
+				Debug.Assert(!m_dIdToItem.ContainsValue(pe));
+
+				m_dUuidToId[pe.Uuid] = uId;
+				m_dIdToItem[uId] = pe;
+				++uId;
+			}
+			++uId; // Make hole
+
+			// Consecutive groups must have consecutive IDs
+			foreach(PwGroup pgSub in pg.Groups)
+			{
+				Debug.Assert(!m_dUuidToId.ContainsKey(pgSub.Uuid));
+				Debug.Assert(!m_dIdToItem.ContainsValue(pgSub));
+
+				m_dUuidToId[pgSub.Uuid] = uId;
+				m_dIdToItem[uId] = pgSub;
+				++uId;
+			}
+			++uId; // Make hole
+
+			foreach(PwGroup pgSub in pg.Groups)
+			{
+				AddGroupRec(pgSub, ref uId);
+			}
+
+			uFreeId = uId;
+		}
+
+		public ulong GetIdByUuid(PwUuid pwUuid)
+		{
+			if(pwUuid == null) { Debug.Assert(false); return 0; }
+
+			ulong uId;
+			m_dUuidToId.TryGetValue(pwUuid, out uId);
+			return uId;
+		}
+
+		public IStructureItem GetItemByUuid(PwUuid pwUuid)
+		{
+			if(pwUuid == null) { Debug.Assert(false); return null; }
+
+			ulong uId;
+			if(!m_dUuidToId.TryGetValue(pwUuid, out uId)) return null;
+			Debug.Assert(uId != 0);
+
+			return GetItemById(uId);
+		}
+
+		public IStructureItem GetItemById(ulong uId)
+		{
+			IStructureItem p;
+			m_dIdToItem.TryGetValue(uId, out p);
+			return p;
+		}
+	}
+
+	internal sealed class PwObjectBlock<T> : IEnumerable<T>
+		where T : class, ITimeLogger, IStructureItem, IDeepCloneable<T>
+	{
+		private List<T> m_l = new List<T>();
+
+		public T PrimaryItem
+		{
+			get { return ((m_l.Count > 0) ? m_l[0] : null); }
+		}
+
+		private DateTime m_dtLocationChanged = TimeUtil.SafeMinValueUtc;
+		public DateTime LocationChanged
+		{
+			get { return m_dtLocationChanged; }
+		}
+
+		private PwObjectPoolEx m_poolAssoc = null;
+		public PwObjectPoolEx PoolAssoc
+		{
+			get { return m_poolAssoc; }
+		}
+
+		public PwObjectBlock()
+		{
+		}
+
+#if DEBUG
+		public override string ToString()
+		{
+			return ("PwObjectBlock, Count = " + m_l.Count.ToString());
+		}
+#endif
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_l.GetEnumerator();
+		}
+
+		public IEnumerator<T> GetEnumerator()
+		{
+			return m_l.GetEnumerator();
+		}
+
+		public void Add(T t, DateTime dtLoc, PwObjectPoolEx pool)
+		{
+			if(t == null) { Debug.Assert(false); return; }
+
+			m_l.Add(t);
+
+			if(dtLoc > m_dtLocationChanged)
+			{
+				m_dtLocationChanged = dtLoc;
+				m_poolAssoc = pool;
+			}
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/StringDictionaryEx.cs

@@ -0,0 +1,170 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Interfaces;
+
+#if KeePassLibSD
+using KeePassLibSD;
+#endif
+
+namespace KeePassLib.Collections
+{
+	public sealed class StringDictionaryEx : IDeepCloneable<StringDictionaryEx>,
+		IEnumerable<KeyValuePair<string, string>>, IEquatable<StringDictionaryEx>
+	{
+		private SortedDictionary<string, string> m_d =
+			new SortedDictionary<string, string>();
+
+		// Non-null if and only if last mod. times should be remembered
+		private Dictionary<string, DateTime> m_dLastMod = null;
+
+		public int Count
+		{
+			get { return m_d.Count; }
+		}
+
+		public StringDictionaryEx()
+		{
+		}
+
+		internal StringDictionaryEx(bool bRememberLastMod)
+		{
+			if (bRememberLastMod) m_dLastMod = new Dictionary<string, DateTime>();
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_d.GetEnumerator();
+		}
+
+		public IEnumerator<KeyValuePair<string, string>> GetEnumerator()
+		{
+			return m_d.GetEnumerator();
+		}
+
+		public StringDictionaryEx CloneDeep()
+		{
+			StringDictionaryEx sdNew = new StringDictionaryEx();
+
+			foreach (KeyValuePair<string, string> kvp in m_d)
+				sdNew.m_d[kvp.Key] = kvp.Value;
+
+			if (m_dLastMod != null)
+				sdNew.m_dLastMod = new Dictionary<string, DateTime>(m_dLastMod);
+
+			Debug.Assert(Equals(sdNew));
+			return sdNew;
+		}
+
+		public bool Equals(StringDictionaryEx sdOther)
+		{
+			if (sdOther == null) { Debug.Assert(false); return false; }
+
+			if (m_d.Count != sdOther.m_d.Count) return false;
+
+			foreach (KeyValuePair<string, string> kvp in sdOther.m_d)
+			{
+				string str = Get(kvp.Key);
+				if ((str == null) || (str != kvp.Value)) return false;
+			}
+
+			int cLastModT = ((m_dLastMod != null) ? m_dLastMod.Count : -1);
+			int cLastModO = ((sdOther.m_dLastMod != null) ? sdOther.m_dLastMod.Count : -1);
+			if (cLastModT != cLastModO) return false;
+
+			if (m_dLastMod != null)
+			{
+				foreach (KeyValuePair<string, DateTime> kvp in sdOther.m_dLastMod)
+				{
+					DateTime? odt = GetLastModificationTime(kvp.Key);
+					if (!odt.HasValue) return false;
+					if (odt.Value != kvp.Value) return false;
+				}
+			}
+
+			return true;
+		}
+
+		public string Get(string strName)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+
+			string str;
+			m_d.TryGetValue(strName, out str);
+			return str;
+		}
+
+		internal DateTime? GetLastModificationTime(string strName)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+
+			if (m_dLastMod == null) return null;
+
+			DateTime dt;
+			if (m_dLastMod.TryGetValue(strName, out dt)) return dt;
+			return null;
+		}
+
+		public bool Exists(string strName)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+
+			return m_d.ContainsKey(strName);
+		}
+
+		public void Set(string strName, string strValue)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+			if (strValue == null) { Debug.Assert(false); throw new ArgumentNullException("strValue"); }
+
+			m_d[strName] = strValue;
+
+			if (m_dLastMod != null) m_dLastMod[strName] = DateTime.UtcNow;
+		}
+
+		internal void Set(string strName, string strValue, DateTime? odtLastMod)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+			if (strValue == null) { Debug.Assert(false); throw new ArgumentNullException("strValue"); }
+
+			m_d[strName] = strValue;
+
+			if (m_dLastMod != null)
+			{
+				if (odtLastMod.HasValue) m_dLastMod[strName] = odtLastMod.Value;
+				else m_dLastMod.Remove(strName);
+			}
+		}
+
+		public bool Remove(string strName)
+		{
+			if (strName == null) { Debug.Assert(false); throw new ArgumentNullException("strName"); }
+
+			if (m_dLastMod != null) m_dLastMod.Remove(strName);
+
+			return m_d.Remove(strName);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Collections/VariantDictionary.cs

@@ -0,0 +1,415 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+
+using KeePassLib.Resources;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Collections
+{
+	public class VariantDictionary : ICloneable
+	{
+		private const ushort VdVersion = 0x0100;
+		private const ushort VdmCritical = 0xFF00;
+		private const ushort VdmInfo = 0x00FF;
+
+		private Dictionary<string, object> m_d = new Dictionary<string, object>();
+
+		private enum VdType : byte
+		{
+			None = 0,
+
+			// Byte = 0x02,
+			// UInt16 = 0x03,
+			UInt32 = 0x04,
+			UInt64 = 0x05,
+
+			// Signed mask: 0x08
+			Bool = 0x08,
+			// SByte = 0x0A,
+			// Int16 = 0x0B,
+			Int32 = 0x0C,
+			Int64 = 0x0D,
+
+			// Float = 0x10,
+			// Double = 0x11,
+			// Decimal = 0x12,
+
+			// Char = 0x17, // 16-bit Unicode character
+			String = 0x18,
+
+			// Array mask: 0x40
+			ByteArray = 0x42
+		}
+
+		public int Count
+		{
+			get { return m_d.Count; }
+		}
+
+		public VariantDictionary()
+		{
+			Debug.Assert((VdmCritical & VdmInfo) == ushort.MinValue);
+			Debug.Assert((VdmCritical | VdmInfo) == ushort.MaxValue);
+		}
+
+		private bool Get<T>(string strName, out T t)
+		{
+			t = default(T);
+
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return false; }
+
+			object o;
+			if(!m_d.TryGetValue(strName, out o)) return false; // No assert
+
+			if(o == null) { Debug.Assert(false); return false; }
+			if(o.GetType() != typeof(T)) { Debug.Assert(false); return false; }
+
+			t = (T)o;
+			return true;
+		}
+
+		private void SetStruct<T>(string strName, T t)
+			where T : struct
+		{
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return; }
+
+#if DEBUG
+			T tEx;
+			Get<T>(strName, out tEx); // Assert same type
+#endif
+
+			m_d[strName] = t;
+		}
+
+		private void SetRef<T>(string strName, T t)
+			where T : class
+		{
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return; }
+			if(t == null) { Debug.Assert(false); return; }
+
+#if DEBUG
+			T tEx;
+			Get<T>(strName, out tEx); // Assert same type
+#endif
+
+			m_d[strName] = t;
+		}
+
+		public bool Remove(string strName)
+		{
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return false; }
+
+			return m_d.Remove(strName);
+		}
+
+		public void CopyTo(VariantDictionary d)
+		{
+			if(d == null) { Debug.Assert(false); return; }
+
+			// Do not clear the target
+			foreach(KeyValuePair<string, object> kvp in m_d)
+			{
+				d.m_d[kvp.Key] = kvp.Value;
+			}
+		}
+
+		public Type GetTypeOf(string strName)
+		{
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return null; }
+
+			object o;
+			m_d.TryGetValue(strName, out o);
+			if(o == null) return null; // No assert
+
+			return o.GetType();
+		}
+
+		public uint GetUInt32(string strName, uint uDefault)
+		{
+			uint u;
+			if(Get<uint>(strName, out u)) return u;
+			return uDefault;
+		}
+
+		public void SetUInt32(string strName, uint uValue)
+		{
+			SetStruct<uint>(strName, uValue);
+		}
+
+		public ulong GetUInt64(string strName, ulong uDefault)
+		{
+			ulong u;
+			if(Get<ulong>(strName, out u)) return u;
+			return uDefault;
+		}
+
+		public void SetUInt64(string strName, ulong uValue)
+		{
+			SetStruct<ulong>(strName, uValue);
+		}
+
+		public bool GetBool(string strName, bool bDefault)
+		{
+			bool b;
+			if(Get<bool>(strName, out b)) return b;
+			return bDefault;
+		}
+
+		public void SetBool(string strName, bool bValue)
+		{
+			SetStruct<bool>(strName, bValue);
+		}
+
+		public int GetInt32(string strName, int iDefault)
+		{
+			int i;
+			if(Get<int>(strName, out i)) return i;
+			return iDefault;
+		}
+
+		public void SetInt32(string strName, int iValue)
+		{
+			SetStruct<int>(strName, iValue);
+		}
+
+		public long GetInt64(string strName, long lDefault)
+		{
+			long l;
+			if(Get<long>(strName, out l)) return l;
+			return lDefault;
+		}
+
+		public void SetInt64(string strName, long lValue)
+		{
+			SetStruct<long>(strName, lValue);
+		}
+
+		public string GetString(string strName)
+		{
+			string str;
+			Get<string>(strName, out str);
+			return str;
+		}
+
+		public void SetString(string strName, string strValue)
+		{
+			SetRef<string>(strName, strValue);
+		}
+
+		public byte[] GetByteArray(string strName)
+		{
+			byte[] pb;
+			Get<byte[]>(strName, out pb);
+			return pb;
+		}
+
+		public void SetByteArray(string strName, byte[] pbValue)
+		{
+			SetRef<byte[]>(strName, pbValue);
+		}
+
+		/// <summary>
+		/// Create a deep copy.
+		/// </summary>
+		public virtual object Clone()
+		{
+			VariantDictionary vdNew = new VariantDictionary();
+
+			foreach(KeyValuePair<string, object> kvp in m_d)
+			{
+				object o = kvp.Value;
+				if(o == null) { Debug.Assert(false); continue; }
+
+				Type t = o.GetType();
+				if(t == typeof(byte[]))
+				{
+					byte[] p = (byte[])o;
+					byte[] pNew = new byte[p.Length];
+					if(p.Length > 0) Array.Copy(p, pNew, p.Length);
+
+					o = pNew;
+				}
+
+				vdNew.m_d[kvp.Key] = o;
+			}
+
+			return vdNew;
+		}
+
+		public static byte[] Serialize(VariantDictionary p)
+		{
+			if(p == null) { Debug.Assert(false); return null; }
+
+			byte[] pbRet;
+			using(MemoryStream ms = new MemoryStream())
+			{
+				MemUtil.Write(ms, MemUtil.UInt16ToBytes(VdVersion));
+
+				foreach(KeyValuePair<string, object> kvp in p.m_d)
+				{
+					string strName = kvp.Key;
+					if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); continue; }
+					byte[] pbName = StrUtil.Utf8.GetBytes(strName);
+
+					object o = kvp.Value;
+					if(o == null) { Debug.Assert(false); continue; }
+
+					Type t = o.GetType();
+					VdType vt = VdType.None;
+					byte[] pbValue = null;
+					if(t == typeof(uint))
+					{
+						vt = VdType.UInt32;
+						pbValue = MemUtil.UInt32ToBytes((uint)o);
+					}
+					else if(t == typeof(ulong))
+					{
+						vt = VdType.UInt64;
+						pbValue = MemUtil.UInt64ToBytes((ulong)o);
+					}
+					else if(t == typeof(bool))
+					{
+						vt = VdType.Bool;
+						pbValue = new byte[1];
+						pbValue[0] = ((bool)o ? (byte)1 : (byte)0);
+					}
+					else if(t == typeof(int))
+					{
+						vt = VdType.Int32;
+						pbValue = MemUtil.Int32ToBytes((int)o);
+					}
+					else if(t == typeof(long))
+					{
+						vt = VdType.Int64;
+						pbValue = MemUtil.Int64ToBytes((long)o);
+					}
+					else if(t == typeof(string))
+					{
+						vt = VdType.String;
+						pbValue = StrUtil.Utf8.GetBytes((string)o);
+					}
+					else if(t == typeof(byte[]))
+					{
+						vt = VdType.ByteArray;
+						pbValue = (byte[])o;
+					}
+					else { Debug.Assert(false); continue; } // Unknown type
+
+					ms.WriteByte((byte)vt);
+					MemUtil.Write(ms, MemUtil.Int32ToBytes(pbName.Length));
+					MemUtil.Write(ms, pbName);
+					MemUtil.Write(ms, MemUtil.Int32ToBytes(pbValue.Length));
+					MemUtil.Write(ms, pbValue);
+				}
+
+				ms.WriteByte((byte)VdType.None);
+				pbRet = ms.ToArray();
+			}
+
+			return pbRet;
+		}
+
+		public static VariantDictionary Deserialize(byte[] pb)
+		{
+			if(pb == null) { Debug.Assert(false); return null; }
+
+			VariantDictionary d = new VariantDictionary();
+			using(MemoryStream ms = new MemoryStream(pb, false))
+			{
+				ushort uVersion = MemUtil.BytesToUInt16(MemUtil.Read(ms, 2));
+				if((uVersion & VdmCritical) > (VdVersion & VdmCritical))
+					throw new FormatException(KLRes.FileNewVerReq);
+
+				while(true)
+				{
+					int iType = ms.ReadByte();
+					if(iType < 0) throw new EndOfStreamException(KLRes.FileCorrupted);
+					byte btType = (byte)iType;
+					if(btType == (byte)VdType.None) break;
+
+					int cbName = MemUtil.BytesToInt32(MemUtil.Read(ms, 4));
+					byte[] pbName = MemUtil.Read(ms, cbName);
+					if(pbName.Length != cbName)
+						throw new EndOfStreamException(KLRes.FileCorrupted);
+					string strName = StrUtil.Utf8.GetString(pbName);
+
+					int cbValue = MemUtil.BytesToInt32(MemUtil.Read(ms, 4));
+					byte[] pbValue = MemUtil.Read(ms, cbValue);
+					if(pbValue.Length != cbValue)
+						throw new EndOfStreamException(KLRes.FileCorrupted);
+
+					switch(btType)
+					{
+						case (byte)VdType.UInt32:
+							if(cbValue == 4)
+								d.SetUInt32(strName, MemUtil.BytesToUInt32(pbValue));
+							else { Debug.Assert(false); }
+							break;
+
+						case (byte)VdType.UInt64:
+							if(cbValue == 8)
+								d.SetUInt64(strName, MemUtil.BytesToUInt64(pbValue));
+							else { Debug.Assert(false); }
+							break;
+
+						case (byte)VdType.Bool:
+							if(cbValue == 1)
+								d.SetBool(strName, (pbValue[0] != 0));
+							else { Debug.Assert(false); }
+							break;
+
+						case (byte)VdType.Int32:
+							if(cbValue == 4)
+								d.SetInt32(strName, MemUtil.BytesToInt32(pbValue));
+							else { Debug.Assert(false); }
+							break;
+
+						case (byte)VdType.Int64:
+							if(cbValue == 8)
+								d.SetInt64(strName, MemUtil.BytesToInt64(pbValue));
+							else { Debug.Assert(false); }
+							break;
+
+						case (byte)VdType.String:
+							d.SetString(strName, StrUtil.Utf8.GetString(pbValue));
+							break;
+
+						case (byte)VdType.ByteArray:
+							d.SetByteArray(strName, pbValue);
+							break;
+
+						default:
+							Debug.Assert(false); // Unknown type
+							break;
+					}
+				}
+
+				Debug.Assert(ms.ReadByte() < 0);
+			}
+
+			return d;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/ChaCha20Cipher.cs

@@ -0,0 +1,254 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+
+using KeePassLib.Resources;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	/// <summary>
+	/// Implementation of the ChaCha20 cipher with a 96-bit nonce,
+	/// as specified in RFC 7539.
+	/// https://tools.ietf.org/html/rfc7539
+	/// </summary>
+	public sealed class ChaCha20Cipher : CtrBlockCipher
+	{
+		private uint[] m_s = new uint[16]; // State
+		private uint[] m_x = new uint[16]; // Working buffer
+
+		private bool m_bLargeCounter; // See constructor documentation
+
+		private static readonly uint[] g_sigma = new uint[4] {
+			0x61707865, 0x3320646E, 0x79622D32, 0x6B206574
+		};
+
+		private const string StrNameRfc = "ChaCha20 (RFC 7539)";
+
+		public override int BlockSize
+		{
+			get { return 64; }
+		}
+
+		public ChaCha20Cipher(byte[] pbKey32, byte[] pbIV12) :
+			this(pbKey32, pbIV12, false)
+		{
+		}
+
+		/// <summary>
+		/// Constructor.
+		/// </summary>
+		/// <param name="pbKey32">Key (32 bytes).</param>
+		/// <param name="pbIV12">Nonce (12 bytes).</param>
+		/// <param name="bLargeCounter">If <c>false</c>, the RFC 7539 version
+		/// of ChaCha20 is used. In this case, only 256 GB of data can be
+		/// encrypted securely (because the block counter is a 32-bit variable);
+		/// an attempt to encrypt more data throws an exception.
+		/// If <paramref name="bLargeCounter" /> is <c>true</c>, the 32-bit
+		/// counter overflows to another 32-bit variable (i.e. the counter
+		/// effectively is a 64-bit variable), like in the original ChaCha20
+		/// specification by D. J. Bernstein (which has a 64-bit counter and a
+		/// 64-bit nonce). To be compatible with this version, the 64-bit nonce
+		/// must be stored in the last 8 bytes of <paramref name="pbIV12" />
+		/// and the first 4 bytes must be 0.
+		/// If the IV was generated randomly, a 12-byte IV and a large counter
+		/// can be used to securely encrypt more than 256 GB of data (but note
+		/// this is incompatible with RFC 7539 and the original specification).</param>
+		public ChaCha20Cipher(byte[] pbKey32, byte[] pbIV12, bool bLargeCounter) :
+			base()
+		{
+			if(pbKey32 == null) throw new ArgumentNullException("pbKey32");
+			if(pbKey32.Length != 32) throw new ArgumentOutOfRangeException("pbKey32");
+			if(pbIV12 == null) throw new ArgumentNullException("pbIV12");
+			if(pbIV12.Length != 12) throw new ArgumentOutOfRangeException("pbIV12");
+
+			m_bLargeCounter = bLargeCounter;
+
+			// Key setup
+			m_s[4] = MemUtil.BytesToUInt32(pbKey32, 0);
+			m_s[5] = MemUtil.BytesToUInt32(pbKey32, 4);
+			m_s[6] = MemUtil.BytesToUInt32(pbKey32, 8);
+			m_s[7] = MemUtil.BytesToUInt32(pbKey32, 12);
+			m_s[8] = MemUtil.BytesToUInt32(pbKey32, 16);
+			m_s[9] = MemUtil.BytesToUInt32(pbKey32, 20);
+			m_s[10] = MemUtil.BytesToUInt32(pbKey32, 24);
+			m_s[11] = MemUtil.BytesToUInt32(pbKey32, 28);
+			m_s[0] = g_sigma[0];
+			m_s[1] = g_sigma[1];
+			m_s[2] = g_sigma[2];
+			m_s[3] = g_sigma[3];
+
+			// IV setup
+			m_s[12] = 0; // Counter
+			m_s[13] = MemUtil.BytesToUInt32(pbIV12, 0);
+			m_s[14] = MemUtil.BytesToUInt32(pbIV12, 4);
+			m_s[15] = MemUtil.BytesToUInt32(pbIV12, 8);
+		}
+
+		protected override void Dispose(bool bDisposing)
+		{
+			if(bDisposing)
+			{
+				MemUtil.ZeroArray<uint>(m_s);
+				MemUtil.ZeroArray<uint>(m_x);
+			}
+
+			base.Dispose(bDisposing);
+		}
+
+		protected override void NextBlock(byte[] pBlock)
+		{
+			if(pBlock == null) throw new ArgumentNullException("pBlock");
+			if(pBlock.Length != 64) throw new ArgumentOutOfRangeException("pBlock");
+
+			// x is a local alias for the working buffer; with this,
+			// the compiler/runtime might remove some checks
+			uint[] x = m_x;
+			if(x == null) throw new InvalidOperationException();
+			if(x.Length < 16) throw new InvalidOperationException();
+
+			uint[] s = m_s;
+			if(s == null) throw new InvalidOperationException();
+			if(s.Length < 16) throw new InvalidOperationException();
+
+			Array.Copy(s, x, 16);
+
+			unchecked
+			{
+				// 10 * 8 quarter rounds = 20 rounds
+				for(int i = 0; i < 10; ++i)
+				{
+					// Column quarter rounds
+					x[ 0] += x[ 4];
+					x[12] = MemUtil.RotateLeft32(x[12] ^ x[ 0], 16);
+					x[ 8] += x[12];
+					x[ 4] = MemUtil.RotateLeft32(x[ 4] ^ x[ 8], 12);
+					x[ 0] += x[ 4];
+					x[12] = MemUtil.RotateLeft32(x[12] ^ x[ 0], 8);
+					x[ 8] += x[12];
+					x[ 4] = MemUtil.RotateLeft32(x[ 4] ^ x[ 8], 7);
+
+					x[ 1] += x[ 5];
+					x[13] = MemUtil.RotateLeft32(x[13] ^ x[ 1], 16);
+					x[ 9] += x[13];
+					x[ 5] = MemUtil.RotateLeft32(x[ 5] ^ x[ 9], 12);
+					x[ 1] += x[ 5];
+					x[13] = MemUtil.RotateLeft32(x[13] ^ x[ 1], 8);
+					x[ 9] += x[13];
+					x[ 5] = MemUtil.RotateLeft32(x[ 5] ^ x[ 9], 7);
+
+					x[ 2] += x[ 6];
+					x[14] = MemUtil.RotateLeft32(x[14] ^ x[ 2], 16);
+					x[10] += x[14];
+					x[ 6] = MemUtil.RotateLeft32(x[ 6] ^ x[10], 12);
+					x[ 2] += x[ 6];
+					x[14] = MemUtil.RotateLeft32(x[14] ^ x[ 2], 8);
+					x[10] += x[14];
+					x[ 6] = MemUtil.RotateLeft32(x[ 6] ^ x[10], 7);
+
+					x[ 3] += x[ 7];
+					x[15] = MemUtil.RotateLeft32(x[15] ^ x[ 3], 16);
+					x[11] += x[15];
+					x[ 7] = MemUtil.RotateLeft32(x[ 7] ^ x[11], 12);
+					x[ 3] += x[ 7];
+					x[15] = MemUtil.RotateLeft32(x[15] ^ x[ 3], 8);
+					x[11] += x[15];
+					x[ 7] = MemUtil.RotateLeft32(x[ 7] ^ x[11], 7);
+
+					// Diagonal quarter rounds
+					x[ 0] += x[ 5];
+					x[15] = MemUtil.RotateLeft32(x[15] ^ x[ 0], 16);
+					x[10] += x[15];
+					x[ 5] = MemUtil.RotateLeft32(x[ 5] ^ x[10], 12);
+					x[ 0] += x[ 5];
+					x[15] = MemUtil.RotateLeft32(x[15] ^ x[ 0],  8);
+					x[10] += x[15];
+					x[ 5] = MemUtil.RotateLeft32(x[ 5] ^ x[10],  7);
+
+					x[ 1] += x[ 6];
+					x[12] = MemUtil.RotateLeft32(x[12] ^ x[ 1], 16);
+					x[11] += x[12];
+					x[ 6] = MemUtil.RotateLeft32(x[ 6] ^ x[11], 12);
+					x[ 1] += x[ 6];
+					x[12] = MemUtil.RotateLeft32(x[12] ^ x[ 1],  8);
+					x[11] += x[12];
+					x[ 6] = MemUtil.RotateLeft32(x[ 6] ^ x[11],  7);
+
+					x[ 2] += x[ 7];
+					x[13] = MemUtil.RotateLeft32(x[13] ^ x[ 2], 16);
+					x[ 8] += x[13];
+					x[ 7] = MemUtil.RotateLeft32(x[ 7] ^ x[ 8], 12);
+					x[ 2] += x[ 7];
+					x[13] = MemUtil.RotateLeft32(x[13] ^ x[ 2],  8);
+					x[ 8] += x[13];
+					x[ 7] = MemUtil.RotateLeft32(x[ 7] ^ x[ 8],  7);
+
+					x[ 3] += x[ 4];
+					x[14] = MemUtil.RotateLeft32(x[14] ^ x[ 3], 16);
+					x[ 9] += x[14];
+					x[ 4] = MemUtil.RotateLeft32(x[ 4] ^ x[ 9], 12);
+					x[ 3] += x[ 4];
+					x[14] = MemUtil.RotateLeft32(x[14] ^ x[ 3],  8);
+					x[ 9] += x[14];
+					x[ 4] = MemUtil.RotateLeft32(x[ 4] ^ x[ 9],  7);
+				}
+
+				for(int i = 0; i < 16; ++i) x[i] += s[i];
+
+				for(int i = 0; i < 16; ++i)
+				{
+					int i4 = i << 2;
+					uint xi = x[i];
+
+					pBlock[i4] = (byte)xi;
+					pBlock[i4 + 1] = (byte)(xi >> 8);
+					pBlock[i4 + 2] = (byte)(xi >> 16);
+					pBlock[i4 + 3] = (byte)(xi >> 24);
+				}
+
+				++s[12];
+				if(s[12] == 0)
+				{
+					if(!m_bLargeCounter)
+						throw new InvalidOperationException(
+							KLRes.EncDataTooLarge.Replace(@"{PARAM}", StrNameRfc));
+					++s[13]; // Increment high half of large counter
+				}
+			}
+		}
+
+		public long Seek(long lOffset, SeekOrigin so)
+		{
+			if(so != SeekOrigin.Begin) throw new NotSupportedException();
+
+			if((lOffset < 0) || ((lOffset & 63) != 0) ||
+				((lOffset >> 6) > (long)uint.MaxValue))
+				throw new ArgumentOutOfRangeException("lOffset");
+
+			m_s[12] = (uint)(lOffset >> 6);
+			InvalidateBlock();
+
+			return lOffset;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/ChaCha20Engine.cs

@@ -0,0 +1,191 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+
+using KeePassLib.Resources;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	public sealed class ChaCha20Engine : ICipherEngine2
+    {
+        private static PwUuid m_uuid = null;
+
+        internal static PwUuid ChaCha20Uuid
+        {
+            get
+            {
+                PwUuid pu = m_uuid;
+                if (pu == null)
+                {
+                    pu = new PwUuid(new byte[] {
+                        0xD6, 0x03, 0x8A, 0x2B, 0x8B, 0x6F, 0x4C, 0xB5,
+                        0xA5, 0x24, 0x33, 0x9A, 0x31, 0xDB, 0xB5, 0x9A });
+                    m_uuid = pu;
+                }
+
+                return pu;
+            }
+        }
+
+		public PwUuid CipherUuid
+		{
+			get { return ChaCha20Uuid; }
+		}
+
+		public string DisplayName
+		{
+			get
+			{
+				return ("ChaCha20 (" + KLRes.KeyBits.Replace(@"{PARAM}",
+					"256") + ", RFC 7539)");
+			}
+		}
+
+		public int KeyLength
+		{
+			get { return 32; }
+		}
+
+		public int IVLength
+		{
+			get { return 12; } // 96 bits
+		}
+
+		public Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV)
+		{
+			return new ChaCha20Stream(sPlainText, true, pbKey, pbIV);
+		}
+
+		public Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV)
+		{
+			return new ChaCha20Stream(sEncrypted, false, pbKey, pbIV);
+		}
+	}
+
+	internal sealed class ChaCha20Stream : Stream
+	{
+		private Stream m_sBase;
+		private readonly bool m_bWriting;
+		private ChaCha20Cipher m_c;
+
+		private byte[] m_pbBuffer = null;
+
+		public override bool CanRead
+		{
+			get { return !m_bWriting; }
+		}
+
+		public override bool CanSeek
+		{
+			get { return false; }
+		}
+
+		public override bool CanWrite
+		{
+			get { return m_bWriting; }
+		}
+
+		public override long Length
+		{
+			get { Debug.Assert(false); throw new NotSupportedException(); }
+		}
+
+		public override long Position
+		{
+			get { Debug.Assert(false); throw new NotSupportedException(); }
+			set { Debug.Assert(false); throw new NotSupportedException(); }
+		}
+
+		public ChaCha20Stream(Stream sBase, bool bWriting, byte[] pbKey32,
+			byte[] pbIV12)
+		{
+			if(sBase == null) throw new ArgumentNullException("sBase");
+
+			m_sBase = sBase;
+			m_bWriting = bWriting;
+			m_c = new ChaCha20Cipher(pbKey32, pbIV12);
+		}
+
+		protected override void Dispose(bool bDisposing)
+		{
+			if(bDisposing)
+			{
+				if(m_sBase != null)
+				{
+					m_c.Dispose();
+					m_c = null;
+
+					m_sBase.Close();
+					m_sBase = null;
+				}
+
+				m_pbBuffer = null;
+			}
+
+			base.Dispose(bDisposing);
+		}
+
+		public override void Flush()
+		{
+			Debug.Assert(m_sBase != null);
+			if(m_bWriting && (m_sBase != null)) m_sBase.Flush();
+		}
+
+		public override long Seek(long lOffset, SeekOrigin soOrigin)
+		{
+			Debug.Assert(false);
+			throw new NotImplementedException();
+		}
+
+		public override void SetLength(long lValue)
+		{
+			Debug.Assert(false);
+			throw new NotImplementedException();
+		}
+
+		public override int Read(byte[] pbBuffer, int iOffset, int nCount)
+		{
+			if(m_bWriting) throw new InvalidOperationException();
+
+			int cbRead = m_sBase.Read(pbBuffer, iOffset, nCount);
+			m_c.Decrypt(pbBuffer, iOffset, cbRead);
+			return cbRead;
+		}
+
+		public override void Write(byte[] pbBuffer, int iOffset, int nCount)
+		{
+			if(nCount < 0) throw new ArgumentOutOfRangeException("nCount");
+			if(nCount == 0) return;
+
+			if(!m_bWriting) throw new InvalidOperationException();
+
+			if((m_pbBuffer == null) || (m_pbBuffer.Length < nCount))
+				m_pbBuffer = new byte[nCount];
+			Array.Copy(pbBuffer, iOffset, m_pbBuffer, 0, nCount);
+
+			m_c.Encrypt(m_pbBuffer, 0, nCount);
+			m_sBase.Write(m_pbBuffer, 0, nCount);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/CipherPool.cs

@@ -0,0 +1,171 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using System.Diagnostics;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	/// <summary>
+	/// Pool of encryption/decryption algorithms (ciphers).
+	/// </summary>
+	public sealed class CipherPool
+	{
+		private List<ICipherEngine> m_vCiphers = new List<ICipherEngine>();
+		private static CipherPool m_poolGlobal = null;
+
+		/// <summary>
+		/// Reference to the global cipher pool.
+		/// </summary>
+		public static CipherPool GlobalPool
+		{
+			get
+			{
+				CipherPool cp = m_poolGlobal;
+				if(cp == null)
+				{
+					cp = new CipherPool();
+					cp.AddCipher(new StandardAesEngine());
+					cp.AddCipher(new ChaCha20Engine());
+					m_poolGlobal = cp;
+				}
+
+				return cp;
+			}
+		}
+
+		/// <summary>
+		/// Remove all cipher engines from the current pool.
+		/// </summary>
+		public void Clear()
+		{
+			m_vCiphers.Clear();
+		}
+
+		/// <summary>
+		/// Add a cipher engine to the pool.
+		/// </summary>
+		/// <param name="csEngine">Cipher engine to add. Must not be <c>null</c>.</param>
+		public void AddCipher(ICipherEngine csEngine)
+		{
+			Debug.Assert(csEngine != null);
+			if(csEngine == null) throw new ArgumentNullException("csEngine");
+
+			// Return if a cipher with that ID is registered already.
+			for(int i = 0; i < m_vCiphers.Count; ++i)
+				if(m_vCiphers[i].CipherUuid.Equals(csEngine.CipherUuid))
+					return;
+
+			m_vCiphers.Add(csEngine);
+		}
+
+		/// <summary>
+		/// Get a cipher identified by its UUID.
+		/// </summary>
+		/// <param name="uuidCipher">UUID of the cipher to return.</param>
+		/// <returns>Reference to the requested cipher. If the cipher is
+		/// not found, <c>null</c> is returned.</returns>
+		public ICipherEngine GetCipher(PwUuid uuidCipher)
+		{
+			foreach(ICipherEngine iEngine in m_vCiphers)
+			{
+				if(iEngine.CipherUuid.Equals(uuidCipher))
+					return iEngine;
+			}
+
+			return null;
+		}
+
+		/// <summary>
+		/// Get the index of a cipher. This index is temporary and should
+		/// not be stored or used to identify a cipher.
+		/// </summary>
+		/// <param name="uuidCipher">UUID of the cipher.</param>
+		/// <returns>Index of the requested cipher. Returns <c>-1</c> if
+		/// the specified cipher is not found.</returns>
+		public int GetCipherIndex(PwUuid uuidCipher)
+		{
+			for(int i = 0; i < m_vCiphers.Count; ++i)
+			{
+				if(m_vCiphers[i].CipherUuid.Equals(uuidCipher))
+					return i;
+			}
+
+			Debug.Assert(false);
+			return -1;
+		}
+
+		/// <summary>
+		/// Get the index of a cipher. This index is temporary and should
+		/// not be stored or used to identify a cipher.
+		/// </summary>
+		/// <param name="strDisplayName">Name of the cipher. Note that
+		/// multiple ciphers can have the same name. In this case, the
+		/// first matching cipher is returned.</param>
+		/// <returns>Cipher with the specified name or <c>-1</c> if
+		/// no cipher with that name is found.</returns>
+		public int GetCipherIndex(string strDisplayName)
+		{
+			for(int i = 0; i < m_vCiphers.Count; ++i)
+				if(m_vCiphers[i].DisplayName == strDisplayName)
+					return i;
+
+			Debug.Assert(false);
+			return -1;
+		}
+
+		/// <summary>
+		/// Get the number of cipher engines in this pool.
+		/// </summary>
+		public int EngineCount
+		{
+			get { return m_vCiphers.Count; }
+		}
+
+		/// <summary>
+		/// Get the cipher engine at the specified position. Throws
+		/// an exception if the index is invalid. You can use this
+		/// to iterate over all ciphers, but do not use it to
+		/// identify ciphers.
+		/// </summary>
+		/// <param name="nIndex">Index of the requested cipher engine.</param>
+		/// <returns>Reference to the cipher engine at the specified
+		/// position.</returns>
+		public ICipherEngine this[int nIndex]
+		{
+			get
+			{
+				if((nIndex < 0) || (nIndex >= m_vCiphers.Count))
+					throw new ArgumentOutOfRangeException("nIndex");
+
+				return m_vCiphers[nIndex];
+			}
+		}
+
+		public IEnumerable<ICipherEngine> Engines
+		{
+			get {
+				return m_vCiphers;
+			}
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/CtrBlockCipher.cs

@@ -0,0 +1,104 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	public abstract class CtrBlockCipher : IDisposable
+	{
+		private byte[] m_pBlock;
+		private int m_iBlockPos;
+
+		public abstract int BlockSize
+		{
+			get;
+		}
+
+		public CtrBlockCipher()
+		{
+			int cb = this.BlockSize;
+			if(cb <= 0) throw new InvalidOperationException("this.BlockSize");
+
+			m_pBlock = new byte[cb];
+			m_iBlockPos = cb;
+		}
+
+		public void Dispose()
+		{
+			Dispose(true);
+			GC.SuppressFinalize(this);
+		}
+
+		protected virtual void Dispose(bool bDisposing)
+		{
+			if(bDisposing)
+			{
+				MemUtil.ZeroByteArray(m_pBlock);
+				m_iBlockPos = m_pBlock.Length;
+			}
+		}
+
+		protected void InvalidateBlock()
+		{
+			m_iBlockPos = m_pBlock.Length;
+		}
+
+		protected abstract void NextBlock(byte[] pBlock);
+
+		public void Encrypt(byte[] m, int iOffset, int cb)
+		{
+			if(m == null) throw new ArgumentNullException("m");
+			if(iOffset < 0) throw new ArgumentOutOfRangeException("iOffset");
+			if(cb < 0) throw new ArgumentOutOfRangeException("cb");
+			if(iOffset > (m.Length - cb)) throw new ArgumentOutOfRangeException("cb");
+
+			int cbBlock = m_pBlock.Length;
+
+			while(cb > 0)
+			{
+				Debug.Assert(m_iBlockPos <= cbBlock);
+				if(m_iBlockPos == cbBlock)
+				{
+					NextBlock(m_pBlock);
+					m_iBlockPos = 0;
+				}
+
+				int cbCopy = Math.Min(cbBlock - m_iBlockPos, cb);
+				Debug.Assert(cbCopy > 0);
+
+				MemUtil.XorArray(m_pBlock, m_iBlockPos, m, iOffset, cbCopy);
+
+				m_iBlockPos += cbCopy;
+				iOffset += cbCopy;
+				cb -= cbCopy;
+			}
+		}
+
+		public void Decrypt(byte[] m, int iOffset, int cb)
+		{
+			Encrypt(m, iOffset, cb);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/ICipherEngine.cs

@@ -0,0 +1,87 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.IO;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	/// <summary>
+	/// Interface of an encryption/decryption class.
+	/// </summary>
+	public interface ICipherEngine
+	{
+		/// <summary>
+		/// UUID of the engine. If you want to write an engine/plugin,
+		/// please contact the KeePass team to obtain a new UUID.
+		/// </summary>
+		PwUuid CipherUuid
+		{
+			get;
+		}
+
+		/// <summary>
+		/// String displayed in the list of available encryption/decryption
+		/// engines in the GUI.
+		/// </summary>
+		string DisplayName
+		{
+			get;
+		}
+
+		/// <summary>
+		/// Encrypt a stream.
+		/// </summary>
+		/// <param name="sPlainText">Stream to read the plain-text from.</param>
+		/// <param name="pbKey">Key to use.</param>
+		/// <param name="pbIV">Initialization vector.</param>
+		/// <returns>Stream, from which the encrypted data can be read.</returns>
+		Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV);
+
+		/// <summary>
+		/// Decrypt a stream.
+		/// </summary>
+		/// <param name="sEncrypted">Stream to read the encrypted data from.</param>
+		/// <param name="pbKey">Key to use.</param>
+		/// <param name="pbIV">Initialization vector.</param>
+		/// <returns>Stream, from which the decrypted data can be read.</returns>
+		Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV);
+	}
+
+	public interface ICipherEngine2 : ICipherEngine
+	{
+		/// <summary>
+		/// Length of an encryption key in bytes.
+		/// The base <c>ICipherEngine</c> assumes 32.
+		/// </summary>
+		int KeyLength
+		{
+			get;
+}
+
+		/// <summary>
+		/// Length of the initialization vector in bytes.
+		/// The base <c>ICipherEngine</c> assumes 16.
+		/// </summary>
+		int IVLength
+		{
+			get;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/Salsa20Cipher.cs

@@ -0,0 +1,165 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+// Implementation of the Salsa20 cipher, based on the eSTREAM submission.
+
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	public sealed class Salsa20Cipher : CtrBlockCipher
+	{
+		private uint[] m_s = new uint[16]; // State
+		private uint[] m_x = new uint[16]; // Working buffer
+
+		private static readonly uint[] g_sigma = new uint[4] {
+			0x61707865, 0x3320646E, 0x79622D32, 0x6B206574
+		};
+
+		public override int BlockSize
+		{
+			get { return 64; }
+		}
+
+		public Salsa20Cipher(byte[] pbKey32, byte[] pbIV8) : base()
+		{
+			if(pbKey32 == null) throw new ArgumentNullException("pbKey32");
+			if(pbKey32.Length != 32) throw new ArgumentOutOfRangeException("pbKey32");
+			if(pbIV8 == null) throw new ArgumentNullException("pbIV8");
+			if(pbIV8.Length != 8) throw new ArgumentOutOfRangeException("pbIV8");
+			// Clear sensitive data
+			// Key setup
+			m_s[1] = MemUtil.BytesToUInt32(pbKey32, 0);
+			m_s[2] = MemUtil.BytesToUInt32(pbKey32, 4);
+			m_s[3] = MemUtil.BytesToUInt32(pbKey32, 8);
+			m_s[4] = MemUtil.BytesToUInt32(pbKey32, 12);
+			m_s[11] = MemUtil.BytesToUInt32(pbKey32, 16);
+			m_s[12] = MemUtil.BytesToUInt32(pbKey32, 20);
+			m_s[13] = MemUtil.BytesToUInt32(pbKey32, 24);
+			m_s[14] = MemUtil.BytesToUInt32(pbKey32, 28);
+			m_s[0] = g_sigma[0];
+			m_s[5] = g_sigma[1];
+			m_s[10] = g_sigma[2];
+			m_s[15] = g_sigma[3];
+
+			// IV setup
+			m_s[6] = MemUtil.BytesToUInt32(pbIV8, 0);
+			m_s[7] = MemUtil.BytesToUInt32(pbIV8, 4);
+			m_s[8] = 0; // Counter, low
+			m_s[9] = 0; // Counter, high
+		}
+
+		protected override void Dispose(bool bDisposing)
+		{
+			if(bDisposing)
+			{
+				MemUtil.ZeroArray<uint>(m_s);
+				MemUtil.ZeroArray<uint>(m_x);
+			}
+
+			base.Dispose(bDisposing);
+		}
+			// Compiler/runtime might remove array bound checks after this
+		protected override void NextBlock(byte[] pBlock)
+		{
+			if(pBlock == null) throw new ArgumentNullException("pBlock");
+			if(pBlock.Length != 64) throw new ArgumentOutOfRangeException("pBlock");
+
+			// x is a local alias for the working buffer; with this,
+			// the compiler/runtime might remove some checks
+			uint[] x = m_x;
+			if(x == null) throw new InvalidOperationException();
+			if(x.Length < 16) throw new InvalidOperationException();
+
+			uint[] s = m_s;
+			if(s == null) throw new InvalidOperationException();
+			if(s.Length < 16) throw new InvalidOperationException();
+
+			Array.Copy(s, x, 16);
+
+			unchecked
+			{
+				// 10 * 8 quarter rounds = 20 rounds
+				for(int i = 0; i < 10; ++i) // (int i = 20; i > 0; i -= 2)
+				{
+					x[ 4] ^= MemUtil.RotateLeft32(x[ 0] + x[12],  7);
+					x[ 8] ^= MemUtil.RotateLeft32(x[ 4] + x[ 0],  9);
+					x[12] ^= MemUtil.RotateLeft32(x[ 8] + x[ 4], 13);
+					x[ 0] ^= MemUtil.RotateLeft32(x[12] + x[ 8], 18);
+
+					x[ 9] ^= MemUtil.RotateLeft32(x[ 5] + x[ 1],  7);
+					x[13] ^= MemUtil.RotateLeft32(x[ 9] + x[ 5],  9);
+					x[ 1] ^= MemUtil.RotateLeft32(x[13] + x[ 9], 13);
+					x[ 5] ^= MemUtil.RotateLeft32(x[ 1] + x[13], 18);
+
+					x[14] ^= MemUtil.RotateLeft32(x[10] + x[ 6],  7);
+					x[ 2] ^= MemUtil.RotateLeft32(x[14] + x[10],  9);
+					x[ 6] ^= MemUtil.RotateLeft32(x[ 2] + x[14], 13);
+					x[10] ^= MemUtil.RotateLeft32(x[ 6] + x[ 2], 18);
+
+					x[ 3] ^= MemUtil.RotateLeft32(x[15] + x[11],  7);
+					x[ 7] ^= MemUtil.RotateLeft32(x[ 3] + x[15],  9);
+					x[11] ^= MemUtil.RotateLeft32(x[ 7] + x[ 3], 13);
+					x[15] ^= MemUtil.RotateLeft32(x[11] + x[ 7], 18);
+
+					x[ 1] ^= MemUtil.RotateLeft32(x[ 0] + x[ 3],  7);
+					x[ 2] ^= MemUtil.RotateLeft32(x[ 1] + x[ 0],  9);
+					x[ 3] ^= MemUtil.RotateLeft32(x[ 2] + x[ 1], 13);
+					x[ 0] ^= MemUtil.RotateLeft32(x[ 3] + x[ 2], 18);
+
+					x[ 6] ^= MemUtil.RotateLeft32(x[ 5] + x[ 4],  7);
+					x[ 7] ^= MemUtil.RotateLeft32(x[ 6] + x[ 5],  9);
+					x[ 4] ^= MemUtil.RotateLeft32(x[ 7] + x[ 6], 13);
+					x[ 5] ^= MemUtil.RotateLeft32(x[ 4] + x[ 7], 18);
+
+					x[11] ^= MemUtil.RotateLeft32(x[10] + x[ 9],  7);
+					x[ 8] ^= MemUtil.RotateLeft32(x[11] + x[10],  9);
+					x[ 9] ^= MemUtil.RotateLeft32(x[ 8] + x[11], 13);
+					x[10] ^= MemUtil.RotateLeft32(x[ 9] + x[ 8], 18);
+
+					x[12] ^= MemUtil.RotateLeft32(x[15] + x[14],  7);
+					x[13] ^= MemUtil.RotateLeft32(x[12] + x[15],  9);
+					x[14] ^= MemUtil.RotateLeft32(x[13] + x[12], 13);
+					x[15] ^= MemUtil.RotateLeft32(x[14] + x[13], 18);
+		}
+
+				for(int i = 0; i < 16; ++i) x[i] += s[i];
+
+				for(int i = 0; i < 16; ++i)
+		{
+					int i4 = i << 2;
+					uint xi = x[i];
+
+					pBlock[i4] = (byte)xi;
+					pBlock[i4 + 1] = (byte)(xi >> 8);
+					pBlock[i4 + 2] = (byte)(xi >> 16);
+					pBlock[i4 + 3] = (byte)(xi >> 24);
+		}
+
+				++s[8];
+				if(s[8] == 0) ++s[9];
+			}
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Cipher/StandardAesEngine.cs

@@ -0,0 +1,157 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using System.Security;
+using System.Diagnostics;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Resources;
+
+namespace KeePassLib.Cryptography.Cipher
+{
+	/// <summary>
+	/// Standard AES cipher implementation.
+	/// </summary>
+	public sealed class StandardAesEngine : ICipherEngine
+	{
+#if !KeePassUAP
+		private const CipherMode m_rCipherMode = CipherMode.CBC;
+		private const PaddingMode m_rCipherPadding = PaddingMode.PKCS7;
+#endif
+
+		private static PwUuid g_uuidAes = null;
+
+		/// <summary>
+		/// UUID of the cipher engine. This ID uniquely identifies the
+		/// AES engine. Must not be used by other ciphers.
+		/// </summary>
+		public static PwUuid AesUuid
+		{
+			get
+			{
+				PwUuid pu = g_uuidAes;
+				if(pu == null)
+				{
+					pu = new PwUuid(new byte[] {
+						0x31, 0xC1, 0xF2, 0xE6, 0xBF, 0x71, 0x43, 0x50,
+						0xBE, 0x58, 0x05, 0x21, 0x6A, 0xFC, 0x5A, 0xFF });
+					g_uuidAes = pu;
+				}
+
+				return pu;
+			}
+		}
+
+		/// <summary>
+		/// Get the UUID of this cipher engine as <c>PwUuid</c> object.
+		/// </summary>
+		public PwUuid CipherUuid
+		{
+			get { return StandardAesEngine.AesUuid; }
+		}
+
+		/// <summary>
+		/// Get a displayable name describing this cipher engine.
+		/// </summary>
+		public string DisplayName
+		{
+			get
+			{
+				return ("AES/Rijndael (" + KLRes.KeyBits.Replace(@"{PARAM}",
+					"256") + ", FIPS 197)");
+			}
+		}
+
+		private static void ValidateArguments(Stream stream, bool bEncrypt, byte[] pbKey, byte[] pbIV)
+		{
+			Debug.Assert(stream != null); if(stream == null) throw new ArgumentNullException("stream");
+
+			Debug.Assert(pbKey != null); if(pbKey == null) throw new ArgumentNullException("pbKey");
+			Debug.Assert(pbKey.Length == 32);
+			if(pbKey.Length != 32) throw new ArgumentException("Key must be 256 bits wide!");
+
+			Debug.Assert(pbIV != null); if(pbIV == null) throw new ArgumentNullException("pbIV");
+			Debug.Assert(pbIV.Length == 16);
+			if(pbIV.Length != 16) throw new ArgumentException("Initialization vector must be 128 bits wide!");
+
+			if(bEncrypt)
+			{
+				Debug.Assert(stream.CanWrite);
+				if(!stream.CanWrite) throw new ArgumentException("Stream must be writable!");
+			}
+			else // Decrypt
+			{
+				Debug.Assert(stream.CanRead);
+				if(!stream.CanRead) throw new ArgumentException("Encrypted stream must be readable!");
+			}
+		}
+
+		private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
+		{
+			StandardAesEngine.ValidateArguments(s, bEncrypt, pbKey, pbIV);
+
+			byte[] pbLocalIV = new byte[16];
+			Array.Copy(pbIV, pbLocalIV, 16);
+
+			byte[] pbLocalKey = new byte[32];
+			Array.Copy(pbKey, pbLocalKey, 32);
+
+#if KeePassUAP
+			return StandardAesEngineExt.CreateStream(s, bEncrypt, pbLocalKey, pbLocalIV);
+#else
+			RijndaelManaged r = new RijndaelManaged();
+			if(r.BlockSize != 128) // AES block size
+			{
+				Debug.Assert(false);
+				r.BlockSize = 128;
+			}
+
+			r.IV = pbLocalIV;
+			r.KeySize = 256;
+			r.Key = pbLocalKey;
+			r.Mode = m_rCipherMode;
+			r.Padding = m_rCipherPadding;
+
+			ICryptoTransform iTransform = (bEncrypt ? r.CreateEncryptor() : r.CreateDecryptor());
+			Debug.Assert(iTransform != null);
+			if(iTransform == null) throw new SecurityException("Unable to create Rijndael transform!");
+
+			return new CryptoStream(s, iTransform, bEncrypt ? CryptoStreamMode.Write :
+				CryptoStreamMode.Read);
+#endif
+		}
+
+		public Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV)
+		{
+			return StandardAesEngine.CreateStream(sPlainText, true, pbKey, pbIV);
+		}
+
+		public Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV)
+		{
+			return StandardAesEngine.CreateStream(sEncrypted, false, pbKey, pbIV);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/CryptoRandom.cs

@@ -0,0 +1,393 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2016 Dominik Reichl <dominik.reichl@t-online.de>
+  
+  Modified to be used with Mono for Android. Changes Copyright (C) 2013 Philipp Crocoll
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Globalization;
+using System.IO;
+
+#if !KeePassUAP
+using System.Drawing;
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Native;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	/// <summary>
+	/// Cryptographically secure pseudo-random number generator.
+	/// The returned values are unpredictable and cannot be reproduced.
+	/// <c>CryptoRandom</c> is a singleton class.
+	/// </summary>
+	public sealed class CryptoRandom
+	{
+		private byte[] m_pbEntropyPool = new byte[64];
+		private ulong m_uCounter;
+		private RNGCryptoServiceProvider m_rng = new RNGCryptoServiceProvider();
+		private ulong m_uGeneratedBytesCount = 0;
+
+		private static object g_oSyncRoot = new object();
+		private object m_oSyncRoot = new object();
+
+		private static CryptoRandom g_pInstance = null;
+		public static CryptoRandom Instance
+		{
+			get
+			{
+				CryptoRandom cr;
+				lock(g_oSyncRoot)
+				{
+					cr = g_pInstance;
+					if(cr == null)
+					{
+						cr = new CryptoRandom();
+						g_pInstance = cr;
+					}
+				}
+
+				return cr;
+			}
+		}
+
+		/// <summary>
+		/// Get the number of random bytes that this instance generated so far.
+		/// Note that this number can be higher than the number of random bytes
+		/// actually requested using the <c>GetRandomBytes</c> method.
+		/// </summary>
+		public ulong GeneratedBytesCount
+		{
+			get
+			{
+				ulong u;
+				lock(m_oSyncRoot) { u = m_uGeneratedBytesCount; }
+				return u;
+			}
+		}
+
+		/// <summary>
+		/// Event that is triggered whenever the internal <c>GenerateRandom256</c>
+		/// method is called to generate random bytes.
+		/// </summary>
+		public event EventHandler GenerateRandom256Pre;
+
+		private CryptoRandom()
+		{
+
+			// byte[] pb = new byte[8];
+			// rWeak.NextBytes(pb);
+			// m_uCounter = MemUtil.BytesToUInt64(pb);
+			m_uCounter = (ulong)DateTime.UtcNow.ToBinary();
+
+			AddEntropy(GetSystemData());
+			AddEntropy(GetCspData());
+		}
+
+		/// <summary>
+		/// Update the internal seed of the random number generator based
+		/// on entropy data.
+		/// This method is thread-safe.
+		/// </summary>
+		/// <param name="pbEntropy">Entropy bytes.</param>
+		public void AddEntropy(byte[] pbEntropy)
+		{
+			if(pbEntropy == null) { Debug.Assert(false); return; }
+			if(pbEntropy.Length == 0) { Debug.Assert(false); return; }
+
+			byte[] pbNewData = pbEntropy;
+			if(pbEntropy.Length > 64)
+			{
+#if KeePassLibSD
+				using(SHA256Managed shaNew = new SHA256Managed())
+#else
+				using(SHA512Managed shaNew = new SHA512Managed())
+#endif
+				{
+				pbNewData = shaNew.ComputeHash(pbEntropy);
+			}
+			}
+
+			lock(m_oSyncRoot)
+			{
+				int cbPool = m_pbEntropyPool.Length;
+				int cbNew = pbNewData.Length;
+
+				byte[] pbCmp = new byte[cbPool + cbNew];
+				Array.Copy(m_pbEntropyPool, pbCmp, cbPool);
+				Array.Copy(pbNewData, 0, pbCmp, cbPool, cbNew);
+
+				MemUtil.ZeroByteArray(m_pbEntropyPool);
+
+#if KeePassLibSD
+				using(SHA256Managed shaPool = new SHA256Managed())
+#else
+				using(SHA512Managed shaPool = new SHA512Managed())
+#endif
+				{
+					m_pbEntropyPool = shaPool.ComputeHash(pbCmp);
+			}
+
+				MemUtil.ZeroByteArray(pbCmp);
+		}
+		}
+
+		private static byte[] GetSystemData()
+		{
+			MemoryStream ms = new MemoryStream();
+			byte[] pb;
+
+			pb = MemUtil.Int32ToBytes(Environment.TickCount);
+			MemUtil.Write(ms, pb);
+
+			pb = MemUtil.Int64ToBytes(DateTime.UtcNow.ToBinary());
+			MemUtil.Write(ms, pb);
+
+#if !KeePassLibSD
+			/*Not supported on Android
+			// In try-catch for systems without GUI;
+			// https://sourceforge.net/p/keepass/discussion/329221/thread/20335b73/
+			try
+			{
+				Point pt = Cursor.Position;
+				pb = MemUtil.Int32ToBytes(pt.X);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int32ToBytes(pt.Y);
+				MemUtil.Write(ms, pb);
+			}
+			catch(Exception) { }
+			 */
+#endif
+
+			pb = MemUtil.UInt32ToBytes((uint)NativeLib.GetPlatformID());
+			MemUtil.Write(ms, pb);
+
+			try
+			{
+#if KeePassUAP
+				string strOS = EnvironmentExt.OSVersion.VersionString;
+#else
+				string strOS = Environment.OSVersion.VersionString;
+#endif
+				AddStrHash(ms, strOS);
+
+				pb = MemUtil.Int32ToBytes(Environment.ProcessorCount);
+				MemUtil.Write(ms, pb);
+
+#if !KeePassUAP
+				AddStrHash(ms, Environment.CommandLine);
+
+				pb = MemUtil.Int64ToBytes(Environment.WorkingSet);
+				MemUtil.Write(ms, pb);
+#endif
+			}
+			catch(Exception) { Debug.Assert(false); }
+
+			try
+			{
+				foreach(DictionaryEntry de in Environment.GetEnvironmentVariables())
+				{
+					AddStrHash(ms, (de.Key as string));
+					AddStrHash(ms, (de.Value as string));
+				}
+			}
+			catch(Exception) { Debug.Assert(false); }
+
+#if KeePassUAP
+			pb = DiagnosticsExt.GetProcessEntropy();
+			MemUtil.Write(ms, pb);
+#elif !KeePassLibSD
+			Process p = null;
+			try
+			{
+				p = Process.GetCurrentProcess();
+				// Not supported in Mono 1.2.6:
+				pb = MemUtil.Int64ToBytes(p.Handle.ToInt64());
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int32ToBytes(p.HandleCount);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int32ToBytes(p.Id);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.NonpagedSystemMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PagedMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PagedSystemMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PeakPagedMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PeakVirtualMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PeakWorkingSet64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.PrivateMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.StartTime.ToBinary());
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.VirtualMemorySize64);
+				MemUtil.Write(ms, pb);
+				pb = MemUtil.Int64ToBytes(p.WorkingSet64);
+				MemUtil.Write(ms, pb);
+				// pb = MemUtil.UInt32ToBytes((uint)p.SessionId);
+				// ms.Write(pb, 0, pb.Length);
+				// pb = MemUtil.UInt32ToBytes((uint)p.SessionId);
+				// MemUtil.Write(ms, pb);
+			}
+			catch(Exception) { Debug.Assert(NativeLib.IsUnix()); }
+			finally
+			{
+				try { if(p != null) p.Dispose(); }
+				catch(Exception) { Debug.Assert(false); }
+			}
+#endif
+
+			try
+			{
+				CultureInfo ci = CultureInfo.CurrentCulture;
+				if(ci != null)
+				{
+					pb = MemUtil.Int32ToBytes(ci.GetHashCode());
+					MemUtil.Write(ms, pb);
+				}
+				else { Debug.Assert(false); }
+			}
+			catch(Exception) { Debug.Assert(false); }
+
+			pb = Guid.NewGuid().ToByteArray();
+			MemUtil.Write(ms, pb);
+
+			byte[] pbAll = ms.ToArray();
+			ms.Close();
+			return pbAll;
+		}
+
+		private static void AddStrHash(Stream s, string str)
+		{
+			if(s == null) { Debug.Assert(false); return; }
+			if(string.IsNullOrEmpty(str)) return;
+
+			byte[] pbUtf8 = StrUtil.Utf8.GetBytes(str);
+			byte[] pbHash = CryptoUtil.HashSha256(pbUtf8);
+			MemUtil.Write(s, pbHash);
+		}
+
+		private byte[] GetCspData()
+		{
+			byte[] pbCspRandom = new byte[32];
+			m_rng.GetBytes(pbCspRandom);
+			return pbCspRandom;
+		}
+
+		private byte[] GenerateRandom256()
+		{
+			if(this.GenerateRandom256Pre != null)
+				this.GenerateRandom256Pre(this, EventArgs.Empty);
+
+			byte[] pbCmp;
+			lock(m_oSyncRoot)
+			{
+				m_uCounter += 0x74D8B29E4D38E161UL; // Prime number
+				byte[] pbCounter = MemUtil.UInt64ToBytes(m_uCounter);
+
+				byte[] pbCspRandom = GetCspData();
+
+				int cbPool = m_pbEntropyPool.Length;
+				int cbCtr = pbCounter.Length;
+				int cbCsp = pbCspRandom.Length;
+
+				pbCmp = new byte[cbPool + cbCtr + cbCsp];
+				Array.Copy(m_pbEntropyPool, pbCmp, cbPool);
+				Array.Copy(pbCounter, 0, pbCmp, cbPool, cbCtr);
+				Array.Copy(pbCspRandom, 0, pbCmp, cbPool + cbCtr, cbCsp);
+
+				MemUtil.ZeroByteArray(pbCspRandom);
+
+				m_uGeneratedBytesCount += 32;
+			}
+
+			byte[] pbRet = CryptoUtil.HashSha256(pbCmp);
+			MemUtil.ZeroByteArray(pbCmp);
+			return pbRet;
+		}
+
+		/// <summary>
+		/// Get a number of cryptographically strong random bytes.
+		/// This method is thread-safe.
+		/// </summary>
+		/// <param name="uRequestedBytes">Number of requested random bytes.</param>
+		/// <returns>A byte array consisting of <paramref name="uRequestedBytes" />
+		/// random bytes.</returns>
+		public byte[] GetRandomBytes(uint uRequestedBytes)
+		{
+			if(uRequestedBytes == 0) return MemUtil.EmptyByteArray;
+			if(uRequestedBytes > (uint)int.MaxValue)
+			{
+				Debug.Assert(false);
+				throw new ArgumentOutOfRangeException("uRequestedBytes");
+			}
+
+			int cbRem = (int)uRequestedBytes;
+			byte[] pbRes = new byte[cbRem];
+			int iPos = 0;
+
+			while(cbRem != 0)
+			{
+				byte[] pbRandom256 = GenerateRandom256();
+				Debug.Assert(pbRandom256.Length == 32);
+
+				int cbCopy = Math.Min(cbRem, pbRandom256.Length);
+				Array.Copy(pbRandom256, 0, pbRes, iPos, cbCopy);
+
+				MemUtil.ZeroByteArray(pbRandom256);
+
+				iPos += cbCopy;
+				cbRem -= cbCopy;
+			}
+
+			Debug.Assert(iPos == pbRes.Length);
+			return pbRes;
+		}
+
+
+        private static int g_iWeakSeed = 0;
+        public static Random NewWeakRandom()
+        {
+            long s64 = DateTime.UtcNow.ToBinary();
+            int s32 = (int)((s64 >> 32) ^ s64);
+
+            lock (g_oSyncRoot)
+            {
+                unchecked
+                {
+                    g_iWeakSeed += 0x78A8C4B7; // Prime number
+                    s32 ^= g_iWeakSeed;
+                }
+            }
+
+            // Prevent overflow in the Random constructor of .NET 2.0
+            if (s32 == int.MinValue) s32 = int.MaxValue;
+
+            return new Random(s32);
+        }
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/CryptoRandomStream.cs

@@ -0,0 +1,258 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Diagnostics;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Cryptography.Cipher;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	/// <summary>
+	/// Algorithms supported by <c>CryptoRandomStream</c>.
+	/// </summary>
+	public enum CrsAlgorithm
+	{
+		/// <summary>
+		/// Not supported.
+		/// </summary>
+		Null = 0,
+
+		/// <summary>
+		/// A variant of the ARCFour algorithm (RC4 incompatible).
+		/// </summary>
+		/// </summary>
+		ArcFourVariant = 1,
+
+		/// <summary>
+		/// Salsa20 stream cipher algorithm.
+		/// </summary>
+		Salsa20 = 2,
+
+		/// <summary>
+		/// ChaCha20 stream cipher algorithm.
+		/// </summary>
+		ChaCha20 = 3,
+
+		Count = 4
+	}
+
+	/// <summary>
+	/// A random stream class. The class is initialized using random
+	/// bytes provided by the caller. The produced stream has random
+	/// properties, but for the same seed always the same stream
+	/// is produced, i.e. this class can be used as stream cipher.
+	/// </summary>
+	public sealed class CryptoRandomStream : IDisposable
+	{
+		private readonly CrsAlgorithm m_crsAlgorithm;
+
+		private byte[] m_pbState = null;
+		private byte m_i = 0;
+		private byte m_j = 0;
+
+		private Salsa20Cipher m_salsa20 = null;
+		private ChaCha20Cipher m_chacha20 = null;
+
+		/// <summary>
+		/// Construct a new cryptographically secure random stream object.
+		/// </summary>
+		/// <param name="genAlgorithm">Algorithm to use.</param>
+		/// <param name="pbKey">Initialization key. Must not be <c>null</c> and
+		/// must contain at least 1 byte.</param>
+		public CryptoRandomStream(CrsAlgorithm a, byte[] pbKey)
+		{
+			if(pbKey == null) { Debug.Assert(false); throw new ArgumentNullException("pbKey"); }
+		/// <exception cref="System.ArgumentNullException">Thrown if the
+			int cbKey = pbKey.Length;
+			if(cbKey <= 0)
+			{
+				Debug.Assert(false); // Need at least one byte
+				throw new ArgumentOutOfRangeException("pbKey");
+			}
+		/// <paramref name="pbKey" /> parameter is <c>null</c>.</exception>
+			m_crsAlgorithm = a;
+		/// <exception cref="System.ArgumentException">Thrown if the
+			if(a == CrsAlgorithm.ChaCha20)
+			{
+				byte[] pbKey32 = new byte[32];
+				byte[] pbIV12 = new byte[12];
+		/// <paramref name="pbKey" /> parameter contains no bytes or the
+				using(SHA512Managed h = new SHA512Managed())
+				{
+					byte[] pbHash = h.ComputeHash(pbKey);
+					Array.Copy(pbHash, pbKey32, 32);
+					Array.Copy(pbHash, 32, pbIV12, 0, 12);
+					MemUtil.ZeroByteArray(pbHash);
+				}
+		/// algorithm is unknown.</exception>
+				m_chacha20 = new ChaCha20Cipher(pbKey32, pbIV12, true);
+			}
+			else if(a == CrsAlgorithm.Salsa20)
+		{
+				byte[] pbKey32 = CryptoUtil.HashSha256(pbKey);
+				byte[] pbIV8 = new byte[8] { 0xE8, 0x30, 0x09, 0x4B,
+					0x97, 0x20, 0x5D, 0x2A }; // Unique constant
+
+				m_salsa20 = new Salsa20Cipher(pbKey32, pbIV8);
+			}
+			else if(a == CrsAlgorithm.ArcFourVariant)
+			{
+				// Fill the state linearly
+				m_pbState = new byte[256];
+				for(int w = 0; w < 256; ++w) m_pbState[w] = (byte)w;
+
+				unchecked
+				{
+					byte j = 0, t;
+					int inxKey = 0;
+					for(int w = 0; w < 256; ++w) // Key setup
+					{
+						j += (byte)(m_pbState[w] + pbKey[inxKey]);
+
+						t = m_pbState[0]; // Swap entries
+						m_pbState[0] = m_pbState[j];
+						m_pbState[j] = t;
+
+						++inxKey;
+						if(inxKey >= cbKey) inxKey = 0;
+					}
+				}
+
+				GetRandomBytes(512); // Increases security, see cryptanalysis
+			}
+			else // Unknown algorithm
+			{
+				Debug.Assert(false);
+				throw new ArgumentOutOfRangeException("a");
+			}
+		}
+
+		public void Dispose()
+		{
+			Dispose(true);
+			GC.SuppressFinalize(this);
+		}
+
+		private void Dispose(bool disposing)
+		{
+			if(disposing)
+			{
+				if(m_crsAlgorithm == CrsAlgorithm.ChaCha20)
+					m_chacha20.Dispose();
+				else if(m_crsAlgorithm == CrsAlgorithm.Salsa20)
+					m_salsa20.Dispose();
+				else if(m_crsAlgorithm == CrsAlgorithm.ArcFourVariant)
+				{
+					MemUtil.ZeroByteArray(m_pbState);
+					m_i = 0;
+					m_j = 0;
+				}
+				else { Debug.Assert(false); }
+			}
+		}
+
+		/// <summary>
+		/// Get <paramref name="uRequestedCount" /> random bytes.
+		/// </summary>
+		/// <param name="uRequestedCount">Number of random bytes to retrieve.</param>
+		/// <returns>Returns <paramref name="uRequestedCount" /> random bytes.</returns>
+		public byte[] GetRandomBytes(uint uRequestedCount)
+		{
+			if(uRequestedCount == 0) return MemUtil.EmptyByteArray;
+
+			if(uRequestedCount > (uint)int.MaxValue)
+				throw new ArgumentOutOfRangeException("uRequestedCount");
+			int cb = (int)uRequestedCount;
+
+			byte[] pbRet = new byte[cb];
+
+			if(m_crsAlgorithm == CrsAlgorithm.ChaCha20)
+				m_chacha20.Encrypt(pbRet, 0, cb);
+			else if(m_crsAlgorithm == CrsAlgorithm.Salsa20)
+				m_salsa20.Encrypt(pbRet, 0, cb);
+			else if(m_crsAlgorithm == CrsAlgorithm.ArcFourVariant)
+			{
+				unchecked
+				{
+					for(int w = 0; w < cb; ++w)
+					{
+						++m_i;
+						m_j += m_pbState[m_i];
+
+						byte t = m_pbState[m_i]; // Swap entries
+						m_pbState[m_i] = m_pbState[m_j];
+						m_pbState[m_j] = t;
+
+						t = (byte)(m_pbState[m_i] + m_pbState[m_j]);
+						pbRet[w] = m_pbState[t];
+					}
+				}
+			}
+			else { Debug.Assert(false); }
+
+			return pbRet;
+		}
+
+		public ulong GetRandomUInt64()
+		{
+			byte[] pb = GetRandomBytes(8);
+			return MemUtil.BytesToUInt64(pb);
+			}
+
+#if CRSBENCHMARK
+		public static string Benchmark()
+		{
+			int nRounds = 2000000;
+			
+			string str = "ArcFour small: " + BenchTime(CrsAlgorithm.ArcFourVariant,
+				nRounds, 16).ToString() + "\r\n";
+			str += "ArcFour big: " + BenchTime(CrsAlgorithm.ArcFourVariant,
+				32, 2 * 1024 * 1024).ToString() + "\r\n";
+			str += "Salsa20 small: " + BenchTime(CrsAlgorithm.Salsa20,
+				nRounds, 16).ToString() + "\r\n";
+			str += "Salsa20 big: " + BenchTime(CrsAlgorithm.Salsa20,
+				32, 2 * 1024 * 1024).ToString();
+			return str;
+		}
+
+		private static int BenchTime(CrsAlgorithm cra, int nRounds, int nDataSize)
+		{
+			byte[] pbKey = new byte[4] { 0x00, 0x01, 0x02, 0x03 };
+
+			int nStart = Environment.TickCount;
+			for(int i = 0; i < nRounds; ++i)
+			{
+				using(CryptoRandomStream c = new CryptoRandomStream(cra, pbKey))
+				{
+					c.GetRandomBytes((uint)nDataSize);
+				}
+			}
+			int nEnd = Environment.TickCount;
+
+			return (nEnd - nStart);
+		}
+#endif
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/CryptoUtil.cs

@@ -0,0 +1,254 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2020 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Reflection;
+using System.Text;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Native;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	public static class CryptoUtil
+	{
+		private static bool? g_obProtData = null;
+		public static bool IsProtectedDataSupported
+		{
+			get
+			{
+				if (g_obProtData.HasValue) return g_obProtData.Value;
+
+				bool b = false;
+				try
+				{
+					Random r = CryptoRandom.NewWeakRandom();
+
+					byte[] pbData = new byte[137];
+					r.NextBytes(pbData);
+
+					byte[] pbEnt = new byte[41];
+					r.NextBytes(pbEnt);
+
+					byte[] pbEnc = ProtectedData.Protect(pbData, pbEnt,
+						DataProtectionScope.CurrentUser);
+					if ((pbEnc != null) && !MemUtil.ArraysEqual(pbEnc, pbData))
+					{
+						byte[] pbDec = ProtectedData.Unprotect(pbEnc, pbEnt,
+							DataProtectionScope.CurrentUser);
+						if ((pbDec != null) && MemUtil.ArraysEqual(pbDec, pbData))
+							b = true;
+					}
+				}
+				catch (Exception) { Debug.Assert(false); }
+
+				Debug.Assert(b); // Should be supported on all systems
+				g_obProtData = b;
+				return b;
+			}
+		}
+
+		public static byte[] HashSha256(byte[] pbData)
+		{
+			if (pbData == null) throw new ArgumentNullException("pbData");
+
+			return HashSha256(pbData, 0, pbData.Length);
+		}
+
+		public static byte[] HashSha256(byte[] pbData, int iOffset, int cbCount)
+		{
+			if (pbData == null) throw new ArgumentNullException("pbData");
+
+#if DEBUG
+			byte[] pbCopy = new byte[pbData.Length];
+			Array.Copy(pbData, pbCopy, pbData.Length);
+#endif
+
+			byte[] pbHash;
+			using (SHA256Managed h = new SHA256Managed())
+			{
+				pbHash = h.ComputeHash(pbData, iOffset, cbCount);
+			}
+
+#if DEBUG
+			// Ensure the data has not been modified
+			Debug.Assert(MemUtil.ArraysEqual(pbData, pbCopy));
+
+			Debug.Assert((pbHash != null) && (pbHash.Length == 32));
+			byte[] pbZero = new byte[32];
+			Debug.Assert(!MemUtil.ArraysEqual(pbHash, pbZero));
+#endif
+
+			return pbHash;
+		}
+
+		internal static byte[] HashSha256(string strFilePath)
+		{
+			byte[] pbHash = null;
+
+			using (FileStream fs = new FileStream(strFilePath, FileMode.Open,
+				FileAccess.Read, FileShare.Read))
+			{
+				using (SHA256Managed h = new SHA256Managed())
+				{
+					pbHash = h.ComputeHash(fs);
+				}
+			}
+
+			return pbHash;
+		}
+
+		/// <summary>
+		/// Create a cryptographic key of length <paramref name="cbOut" />
+		/// (in bytes) from <paramref name="pbIn" />.
+		/// </summary>
+		public static byte[] ResizeKey(byte[] pbIn, int iInOffset,
+			int cbIn, int cbOut)
+		{
+			if (pbIn == null) throw new ArgumentNullException("pbIn");
+			if (cbOut < 0) throw new ArgumentOutOfRangeException("cbOut");
+
+			if (cbOut == 0) return MemUtil.EmptyByteArray;
+
+			byte[] pbHash;
+			if (cbOut <= 32) pbHash = HashSha256(pbIn, iInOffset, cbIn);
+			else
+			{
+				using (SHA512Managed h = new SHA512Managed())
+				{
+					pbHash = h.ComputeHash(pbIn, iInOffset, cbIn);
+				}
+			}
+
+			if (cbOut == pbHash.Length) return pbHash;
+
+			byte[] pbRet = new byte[cbOut];
+			if (cbOut < pbHash.Length)
+				Array.Copy(pbHash, pbRet, cbOut);
+			else
+			{
+				int iPos = 0;
+				ulong r = 0;
+				while (iPos < cbOut)
+				{
+					Debug.Assert(pbHash.Length == 64);
+					using (HMACSHA256 h = new HMACSHA256(pbHash))
+					{
+						byte[] pbR = MemUtil.UInt64ToBytes(r);
+						byte[] pbPart = h.ComputeHash(pbR);
+
+						int cbCopy = Math.Min(cbOut - iPos, pbPart.Length);
+						Debug.Assert(cbCopy > 0);
+
+						Array.Copy(pbPart, 0, pbRet, iPos, cbCopy);
+						iPos += cbCopy;
+						++r;
+
+						MemUtil.ZeroByteArray(pbPart);
+					}
+				}
+				Debug.Assert(iPos == cbOut);
+			}
+
+#if DEBUG
+			byte[] pbZero = new byte[pbHash.Length];
+			Debug.Assert(!MemUtil.ArraysEqual(pbHash, pbZero));
+#endif
+			MemUtil.ZeroByteArray(pbHash);
+			return pbRet;
+		}
+
+#if !KeePassUAP
+		private static bool? g_obAesCsp = null;
+		internal static SymmetricAlgorithm CreateAes()
+		{
+			if (g_obAesCsp.HasValue)
+				return (g_obAesCsp.Value ? CreateAesCsp() : new RijndaelManaged());
+
+			SymmetricAlgorithm a = CreateAesCsp();
+			g_obAesCsp = (a != null);
+			return (a ?? new RijndaelManaged());
+		}
+
+		private static SymmetricAlgorithm CreateAesCsp()
+		{
+			try
+			{
+				// On Windows, the CSP implementation is only minimally
+				// faster (and for key derivations it's not used anyway,
+				// as KeePass uses a native implementation based on
+				// CNG/BCrypt, which is much faster)
+				if (!NativeLib.IsUnix()) return null;
+
+				string strFqn = Assembly.CreateQualifiedName(
+					"System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
+					"System.Security.Cryptography.AesCryptoServiceProvider");
+
+				Type t = Type.GetType(strFqn);
+				if (t == null) return null;
+
+				return (Activator.CreateInstance(t) as SymmetricAlgorithm);
+			}
+			catch (Exception) { Debug.Assert(false); }
+
+			return null;
+		}
+#endif
+
+		public static byte[] ProtectData(byte[] pb, byte[] pbOptEntropy,
+			DataProtectionScope s)
+		{
+			return ProtectDataPriv(pb, true, pbOptEntropy, s);
+		}
+
+		public static byte[] UnprotectData(byte[] pb, byte[] pbOptEntropy,
+			DataProtectionScope s)
+		{
+			return ProtectDataPriv(pb, false, pbOptEntropy, s);
+		}
+
+		private static byte[] ProtectDataPriv(byte[] pb, bool bProtect,
+			byte[] pbOptEntropy, DataProtectionScope s)
+		{
+			if (pb == null) throw new ArgumentNullException("pb");
+
+			if ((pbOptEntropy != null) && (pbOptEntropy.Length == 0))
+				pbOptEntropy = null;
+
+			if (CryptoUtil.IsProtectedDataSupported)
+			{
+				if (bProtect)
+					return ProtectedData.Protect(pb, pbOptEntropy, s);
+				return ProtectedData.Unprotect(pb, pbOptEntropy, s);
+			}
+
+			Debug.Assert(false);
+			byte[] pbCopy = new byte[pb.Length];
+			Array.Copy(pb, pbCopy, pb.Length);
+			return pbCopy;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/Hash/Blake2b.cs

@@ -0,0 +1,232 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+// This implementation is based on the official reference C
+// implementation by Samuel Neves (CC0 1.0 Universal).
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.Hash
+{
+	public sealed class Blake2b : HashAlgorithm
+	{
+		private const int NbRounds = 12;
+		private const int NbBlockBytes = 128;
+		private const int NbMaxOutBytes = 64;
+
+		private static readonly ulong[] g_vIV = new ulong[8] {
+			0x6A09E667F3BCC908UL, 0xBB67AE8584CAA73BUL,
+			0x3C6EF372FE94F82BUL, 0xA54FF53A5F1D36F1UL,
+			0x510E527FADE682D1UL, 0x9B05688C2B3E6C1FUL,
+			0x1F83D9ABFB41BD6BUL, 0x5BE0CD19137E2179UL
+		};
+
+		private static readonly int[] g_vSigma = new int[NbRounds * 16] {
+			0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+			14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3,
+			11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4,
+			7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8,
+			9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13,
+			2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9,
+			12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11,
+			13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10,
+			6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5,
+			10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0,
+			0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+			14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3
+		};
+
+		private readonly int m_cbHashLength;
+
+		private ulong[] m_h = new ulong[8];
+		private ulong[] m_t = new ulong[2];
+		private ulong[] m_f = new ulong[2];
+		private byte[] m_buf = new byte[NbBlockBytes];
+		private int m_cbBuf = 0;
+
+		private ulong[] m_m = new ulong[16];
+		private ulong[] m_v = new ulong[16];
+
+		public Blake2b()
+		{
+			m_cbHashLength = NbMaxOutBytes;
+			this.HashSizeValue = NbMaxOutBytes * 8; // Bits
+
+			Initialize();
+		}
+
+		public Blake2b(int cbHashLength)
+		{
+			if((cbHashLength < 0) || (cbHashLength > NbMaxOutBytes))
+				throw new ArgumentOutOfRangeException("cbHashLength");
+
+			m_cbHashLength = cbHashLength;
+			this.HashSizeValue = cbHashLength * 8; // Bits
+
+			Initialize();
+		}
+
+		public override void Initialize()
+		{
+			Debug.Assert(m_h.Length == g_vIV.Length);
+			Array.Copy(g_vIV, m_h, m_h.Length);
+
+			// Fan-out = 1, depth = 1
+			m_h[0] ^= 0x0000000001010000UL ^ (ulong)m_cbHashLength;
+
+			Array.Clear(m_t, 0, m_t.Length);
+			Array.Clear(m_f, 0, m_f.Length);
+			Array.Clear(m_buf, 0, m_buf.Length);
+			m_cbBuf = 0;
+
+			Array.Clear(m_m, 0, m_m.Length);
+			Array.Clear(m_v, 0, m_v.Length);
+		}
+
+		private static void G(ulong[] v, ulong[] m, int r16, int i,
+			int a, int b, int c, int d)
+		{
+			int p = r16 + i;
+
+			v[a] += v[b] + m[g_vSigma[p]];
+			v[d] = MemUtil.RotateRight64(v[d] ^ v[a], 32);
+			v[c] += v[d];
+			v[b] = MemUtil.RotateRight64(v[b] ^ v[c], 24);
+			v[a] += v[b] + m[g_vSigma[p + 1]];
+			v[d] = MemUtil.RotateRight64(v[d] ^ v[a], 16);
+			v[c] += v[d];
+			v[b] = MemUtil.RotateRight64(v[b] ^ v[c], 63);
+		}
+
+		private void Compress(byte[] pb, int iOffset)
+		{
+			ulong[] v = m_v;
+			ulong[] m = m_m;
+			ulong[] h = m_h;
+
+			for(int i = 0; i < 16; ++i)
+				m[i] = MemUtil.BytesToUInt64(pb, iOffset + (i << 3));
+
+			Array.Copy(h, v, 8);
+			v[8] = g_vIV[0];
+			v[9] = g_vIV[1];
+			v[10] = g_vIV[2];
+			v[11] = g_vIV[3];
+			v[12] = g_vIV[4] ^ m_t[0];
+			v[13] = g_vIV[5] ^ m_t[1];
+			v[14] = g_vIV[6] ^ m_f[0];
+			v[15] = g_vIV[7] ^ m_f[1];
+
+			for(int r = 0; r < NbRounds; ++r)
+			{
+				int r16 = r << 4;
+
+				G(v, m, r16, 0, 0, 4, 8, 12);
+				G(v, m, r16, 2, 1, 5, 9, 13);
+				G(v, m, r16, 4, 2, 6, 10, 14);
+				G(v, m, r16, 6, 3, 7, 11, 15);
+				G(v, m, r16, 8, 0, 5, 10, 15);
+				G(v, m, r16, 10, 1, 6, 11, 12);
+				G(v, m, r16, 12, 2, 7, 8, 13);
+				G(v, m, r16, 14, 3, 4, 9, 14);
+			}
+
+			for(int i = 0; i < 8; ++i)
+				h[i] ^= v[i] ^ v[i + 8];
+		}
+
+		private void IncrementCounter(ulong cb)
+		{
+			m_t[0] += cb;
+			if(m_t[0] < cb) ++m_t[1];
+		}
+
+		protected override void HashCore(byte[] array, int ibStart, int cbSize)
+		{
+			Debug.Assert(m_f[0] == 0);
+
+			if((m_cbBuf + cbSize) > NbBlockBytes) // Not '>=' (buffer must not be empty)
+			{
+				int cbFill = NbBlockBytes - m_cbBuf;
+				if(cbFill > 0) Array.Copy(array, ibStart, m_buf, m_cbBuf, cbFill);
+
+				IncrementCounter((ulong)NbBlockBytes);
+				Compress(m_buf, 0);
+
+				m_cbBuf = 0;
+				cbSize -= cbFill;
+				ibStart += cbFill;
+
+				while(cbSize > NbBlockBytes) // Not '>=' (buffer must not be empty)
+				{
+					IncrementCounter((ulong)NbBlockBytes);
+					Compress(array, ibStart);
+
+					cbSize -= NbBlockBytes;
+					ibStart += NbBlockBytes;
+				}
+			}
+
+			if(cbSize > 0)
+			{
+				Debug.Assert((m_cbBuf + cbSize) <= NbBlockBytes);
+
+				Array.Copy(array, ibStart, m_buf, m_cbBuf, cbSize);
+				m_cbBuf += cbSize;
+			}
+		}
+
+		protected override byte[] HashFinal()
+		{
+			if(m_f[0] != 0) { Debug.Assert(false); throw new InvalidOperationException(); }
+			Debug.Assert(((m_t[1] == 0) && (m_t[0] == 0)) ||
+				(m_cbBuf > 0)); // Buffer must not be empty for last block processing
+
+			m_f[0] = ulong.MaxValue; // Indicate last block
+
+			int cbFill = NbBlockBytes - m_cbBuf;
+			if(cbFill > 0) Array.Clear(m_buf, m_cbBuf, cbFill);
+
+			IncrementCounter((ulong)m_cbBuf);
+			Compress(m_buf, 0);
+
+			byte[] pbHash = new byte[NbMaxOutBytes];
+			for(int i = 0; i < m_h.Length; ++i)
+				MemUtil.UInt64ToBytesEx(m_h[i], pbHash, i << 3);
+
+			if(m_cbHashLength == NbMaxOutBytes) return pbHash;
+			Debug.Assert(m_cbHashLength < NbMaxOutBytes);
+
+			byte[] pbShort = new byte[m_cbHashLength];
+			if(m_cbHashLength > 0)
+				Array.Copy(pbHash, pbShort, m_cbHashLength);
+			MemUtil.ZeroByteArray(pbHash);
+			return pbShort;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/HashingStreamEx.cs

@@ -0,0 +1,184 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using System.Security.Cryptography;
+using System.Diagnostics;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	public sealed class HashingStreamEx : Stream
+	{
+		private readonly Stream m_sBaseStream;
+		private bool m_bWriting;
+		private HashAlgorithm m_hash;
+
+		private byte[] m_pbFinalHash = null;
+
+		public byte[] Hash
+		{
+			get { return m_pbFinalHash; }
+		}
+
+		public override bool CanRead
+		{
+			get { return !m_bWriting; }
+		}
+
+		public override bool CanSeek
+		{
+			get { return false; }
+		}
+
+		public override bool CanWrite
+		{
+			get { return m_bWriting; }
+		}
+
+		public override long Length
+		{
+			get { return m_sBaseStream.Length; }
+		}
+
+		public override long Position
+		{
+			get { return m_sBaseStream.Position; }
+			set { throw new NotSupportedException(); }
+		}
+
+		public HashingStreamEx(Stream sBaseStream, bool bWriting, HashAlgorithm hashAlgorithm)
+		{
+			if(sBaseStream == null) throw new ArgumentNullException("sBaseStream");
+
+			m_sBaseStream = sBaseStream;
+			m_bWriting = bWriting;
+
+#if !KeePassLibSD
+			m_hash = (hashAlgorithm ?? new SHA256Managed());
+#else // KeePassLibSD
+			m_hash = null;
+
+			try { m_hash = HashAlgorithm.Create("SHA256"); }
+			catch(Exception) { }
+			try { if(m_hash == null) m_hash = HashAlgorithm.Create(); }
+			catch(Exception) { }
+#endif
+			if(m_hash == null) { Debug.Assert(false); return; }
+
+			// Validate hash algorithm
+			if((!m_hash.CanReuseTransform) || (!m_hash.CanTransformMultipleBlocks) ||
+				(m_hash.InputBlockSize != 1) || (m_hash.OutputBlockSize != 1))
+			{
+#if DEBUG
+				MessageService.ShowWarning("Broken HashAlgorithm object in HashingStreamEx.");
+#endif
+				m_hash = null;
+			}
+		}
+		protected override void Dispose(bool disposing)
+		{
+			if(disposing)
+		{
+			if(m_hash != null)
+			{
+				try
+				{
+					m_hash.TransformFinalBlock(new byte[0], 0, 0);
+
+					m_pbFinalHash = m_hash.Hash;
+				}
+				catch(Exception) { Debug.Assert(false); }
+
+				m_hash = null;
+			}
+
+			m_sBaseStream.Close();
+		}
+
+			base.Dispose(disposing);
+		}
+
+		public override void Flush()
+		{
+			m_sBaseStream.Flush();
+		}
+
+		public override long Seek(long lOffset, SeekOrigin soOrigin)
+		{
+			throw new NotSupportedException();
+		}
+
+		public override void SetLength(long lValue)
+		{
+			throw new NotSupportedException();
+		}
+
+		public override int Read(byte[] pbBuffer, int nOffset, int nCount)
+		{
+			if(m_bWriting) throw new InvalidOperationException();
+
+			int nRead = m_sBaseStream.Read(pbBuffer, nOffset, nCount);
+			int nPartialRead = nRead;
+			while((nRead < nCount) && (nPartialRead != 0))
+			{
+				nPartialRead = m_sBaseStream.Read(pbBuffer, nOffset + nRead,
+					nCount - nRead);
+				nRead += nPartialRead;
+			}
+
+#if DEBUG
+			byte[] pbOrg = new byte[pbBuffer.Length];
+			Array.Copy(pbBuffer, pbOrg, pbBuffer.Length);
+#endif
+
+			if((m_hash != null) && (nRead > 0))
+				m_hash.TransformBlock(pbBuffer, nOffset, nRead, pbBuffer, nOffset);
+
+#if DEBUG
+			Debug.Assert(MemUtil.ArraysEqual(pbBuffer, pbOrg));
+#endif
+
+			return nRead;
+		}
+
+		public override void Write(byte[] pbBuffer, int nOffset, int nCount)
+		{
+			if(!m_bWriting) throw new InvalidOperationException();
+
+#if DEBUG
+			byte[] pbOrg = new byte[pbBuffer.Length];
+			Array.Copy(pbBuffer, pbOrg, pbBuffer.Length);
+#endif
+
+			if((m_hash != null) && (nCount > 0))
+				m_hash.TransformBlock(pbBuffer, nOffset, nCount, pbBuffer, nOffset);
+
+#if DEBUG
+			Debug.Assert(MemUtil.ArraysEqual(pbBuffer, pbOrg));
+#endif
+
+			m_sBaseStream.Write(pbBuffer, nOffset, nCount);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/HmacOtp.cs

@@ -0,0 +1,92 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Security.Cryptography;
+using System.Globalization;
+
+using KeePassLib.Utility;
+
+#if (!KeePassLibSD && !KeePassRT)
+namespace KeePassLib.Cryptography
+{
+	/// <summary>
+	/// Generate HMAC-based one-time passwords as specified in RFC 4226.
+	/// </summary>
+	public static class HmacOtp
+	{
+		private static readonly uint[] vDigitsPower = new uint[]{ 1, 10, 100,
+			1000, 10000, 100000, 1000000, 10000000, 100000000 };
+
+		public static string Generate(byte[] pbSecret, ulong uFactor,
+			uint uCodeDigits, bool bAddChecksum, int iTruncationOffset)
+		{
+			byte[] pbText = MemUtil.UInt64ToBytes(uFactor);
+			Array.Reverse(pbText); // Big-Endian
+
+			HMACSHA1 hsha1 = new HMACSHA1(pbSecret);
+			byte[] pbHash = hsha1.ComputeHash(pbText);
+
+			uint uOffset = (uint)(pbHash[pbHash.Length - 1] & 0xF);
+			if((iTruncationOffset >= 0) && (iTruncationOffset < (pbHash.Length - 4)))
+				uOffset = (uint)iTruncationOffset;
+
+			uint uBinary = (uint)(((pbHash[uOffset] & 0x7F) << 24) |
+				((pbHash[uOffset + 1] & 0xFF) << 16) |
+				((pbHash[uOffset + 2] & 0xFF) << 8) |
+				(pbHash[uOffset + 3] & 0xFF));
+
+			uint uOtp = (uBinary % vDigitsPower[uCodeDigits]);
+			if(bAddChecksum)
+				uOtp = ((uOtp * 10) + CalculateChecksum(uOtp, uCodeDigits));
+
+			uint uDigits = (bAddChecksum ? (uCodeDigits + 1) : uCodeDigits);
+			return uOtp.ToString(NumberFormatInfo.InvariantInfo).PadLeft(
+				(int)uDigits, '0');
+		}
+
+		private static readonly uint[] vDoubleDigits = new uint[]{ 0, 2, 4, 6, 8,
+			1, 3, 5, 7, 9 };
+
+		private static uint CalculateChecksum(uint uNum, uint uDigits)
+		{
+			bool bDoubleDigit = true;
+			uint uTotal = 0;
+
+			while(0 < uDigits--)
+			{
+				uint uDigit = (uNum % 10);
+				uNum /= 10;
+
+				if(bDoubleDigit) uDigit = vDoubleDigits[uDigit];
+
+				uTotal += uDigit;
+				bDoubleDigit = !bDoubleDigit;
+			}
+
+			uint uResult = (uTotal % 10);
+			if(uResult != 0) uResult = 10 - uResult;
+
+			return uResult;
+		}
+	}
+}
+#endif

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/AesKdf.cs

@@ -0,0 +1,281 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+using keepass2android;
+#if KeePassUAP
+using Org.BouncyCastle.Crypto;
+using Org.BouncyCastle.Crypto.Engines;
+using Org.BouncyCastle.Crypto.Parameters;
+#else
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Cryptography;
+using KeePassLib.Native;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+	public sealed class AesKdf : KdfEngine
+	{
+		private static readonly PwUuid g_uuid = new PwUuid(new byte[] {
+			0xC9, 0xD9, 0xF3, 0x9A, 0x62, 0x8A, 0x44, 0x60,
+			0xBF, 0x74, 0x0D, 0x08, 0xC1, 0x8A, 0x4F, 0xEA });
+
+		public const string ParamRounds = "R"; // UInt64
+		public const string ParamSeed = "S"; // Byte[32]
+
+		public override PwUuid Uuid
+		{
+			get { return g_uuid; }
+		}
+
+		public override string Name
+		{
+			get { return "AES-KDF"; }
+		}
+
+        public override byte[] GetSeed(KdfParameters p)
+        { return p.GetByteArray(ParamSeed); }
+
+        public AesKdf()
+		{
+		}
+
+		public override KdfParameters GetDefaultParameters()
+		{
+			KdfParameters p = base.GetDefaultParameters();
+			p.SetUInt64(ParamRounds, PwDefs.DefaultKeyEncryptionRounds);
+			return p;
+		}
+
+		public override void Randomize(KdfParameters p)
+		{
+			if(p == null) { Debug.Assert(false); return; }
+			Debug.Assert(g_uuid.Equals(p.KdfUuid));
+
+			byte[] pbSeed = CryptoRandom.Instance.GetRandomBytes(32);
+			p.SetByteArray(ParamSeed, pbSeed);
+		}
+
+		public override byte[] Transform(byte[] pbMsg, KdfParameters p)
+		{
+			if(pbMsg == null) throw new ArgumentNullException("pbMsg");
+			if(p == null) throw new ArgumentNullException("p");
+
+			Type tRounds = p.GetTypeOf(ParamRounds);
+			if(tRounds == null) throw new ArgumentNullException("p.Rounds");
+			if(tRounds != typeof(ulong)) throw new ArgumentOutOfRangeException("p.Rounds");
+			ulong uRounds = p.GetUInt64(ParamRounds, 0);
+
+			byte[] pbSeed = p.GetByteArray(ParamSeed);
+			if(pbSeed == null) throw new ArgumentNullException("p.Seed");
+
+			if(pbMsg.Length != 32)
+			{
+				Debug.Assert(false);
+				pbMsg = CryptoUtil.HashSha256(pbMsg);
+			}
+
+			if(pbSeed.Length != 32)
+			{
+				Debug.Assert(false);
+				pbSeed = CryptoUtil.HashSha256(pbSeed);
+			}
+
+			return TransformKey(pbMsg, pbSeed, uRounds);
+		}
+
+		private static byte[] TransformKey(byte[] pbOriginalKey32, byte[] pbKeySeed32,
+			ulong uNumRounds)
+		{
+			Debug.Assert((pbOriginalKey32 != null) && (pbOriginalKey32.Length == 32));
+			if(pbOriginalKey32 == null) throw new ArgumentNullException("pbOriginalKey32");
+			if(pbOriginalKey32.Length != 32) throw new ArgumentException();
+
+			Debug.Assert((pbKeySeed32 != null) && (pbKeySeed32.Length == 32));
+			if(pbKeySeed32 == null) throw new ArgumentNullException("pbKeySeed32");
+			if(pbKeySeed32.Length != 32) throw new ArgumentException();
+
+			byte[] pbNewKey = new byte[32];
+			Array.Copy(pbOriginalKey32, pbNewKey, pbNewKey.Length);
+
+			try
+			{
+				// Try to use the native library first
+				if (NativeLib.TransformKey256(pbNewKey, pbKeySeed32, uNumRounds))
+				{
+					//no need to hash, this is already done in the native library.
+					byte[] pbKey = new byte[32];
+					Array.Copy(pbNewKey, pbKey, pbNewKey.Length);
+
+					return pbKey;
+				
+				}
+					
+				if(TransformKeyManaged(pbNewKey, pbKeySeed32, uNumRounds))
+					return CryptoUtil.HashSha256(pbNewKey);
+			}
+			finally { MemUtil.ZeroByteArray(pbNewKey); }
+
+			return null;
+		}
+
+		public static bool TransformKeyManaged(byte[] pbNewKey32, byte[] pbKeySeed32,
+			ulong uNumRounds)
+		{
+		    Kp2aLog.Log("Warning: transforming key managed. Expect this to be slow!");
+#if KeePassUAP
+			KeyParameter kp = new KeyParameter(pbKeySeed32);
+			AesEngine aes = new AesEngine();
+			aes.Init(true, kp);
+
+			for(ulong i = 0; i < uNumRounds; ++i)
+			{
+				aes.ProcessBlock(pbNewKey32, 0, pbNewKey32, 0);
+				aes.ProcessBlock(pbNewKey32, 16, pbNewKey32, 16);
+			}
+#else
+			byte[] pbIV = new byte[16];
+			Array.Clear(pbIV, 0, pbIV.Length);
+
+			RijndaelManaged r = new RijndaelManaged();
+			if(r.BlockSize != 128) // AES block size
+			{
+				Debug.Assert(false);
+				r.BlockSize = 128;
+			}
+
+			r.IV = pbIV;
+			r.Mode = CipherMode.ECB;
+			r.KeySize = 256;
+			r.Key = pbKeySeed32;
+			ICryptoTransform iCrypt = r.CreateEncryptor();
+
+			// !iCrypt.CanReuseTransform -- doesn't work with Mono
+			if((iCrypt == null) || (iCrypt.InputBlockSize != 16) ||
+				(iCrypt.OutputBlockSize != 16))
+			{
+				Debug.Assert(false, "Invalid ICryptoTransform.");
+				Debug.Assert((iCrypt.InputBlockSize == 16), "Invalid input block size!");
+				Debug.Assert((iCrypt.OutputBlockSize == 16), "Invalid output block size!");
+				return false;
+			}
+
+			for(ulong i = 0; i < uNumRounds; ++i)
+			{
+				iCrypt.TransformBlock(pbNewKey32, 0, 16, pbNewKey32, 0);
+				iCrypt.TransformBlock(pbNewKey32, 16, 16, pbNewKey32, 16);
+			}
+#endif
+
+			return true;
+		}
+
+		public override KdfParameters GetBestParameters(uint uMilliseconds)
+		{
+			const ulong uStep = 3001;
+			ulong uRounds;
+
+			KdfParameters p = GetDefaultParameters();
+
+			// Try native method
+			if(NativeLib.TransformKeyBenchmark256(uMilliseconds, out uRounds))
+			{
+				p.SetUInt64(ParamRounds, uRounds);
+				return p;
+			}
+
+			byte[] pbKey = new byte[32];
+			byte[] pbNewKey = new byte[32];
+			for(int i = 0; i < pbKey.Length; ++i)
+			{
+				pbKey[i] = (byte)i;
+				pbNewKey[i] = (byte)i;
+			}
+
+#if KeePassUAP
+			KeyParameter kp = new KeyParameter(pbKey);
+			AesEngine aes = new AesEngine();
+			aes.Init(true, kp);
+#else
+			byte[] pbIV = new byte[16];
+			Array.Clear(pbIV, 0, pbIV.Length);
+
+			RijndaelManaged r = new RijndaelManaged();
+			if(r.BlockSize != 128) // AES block size
+			{
+				Debug.Assert(false);
+				r.BlockSize = 128;
+			}
+
+			r.IV = pbIV;
+			r.Mode = CipherMode.ECB;
+			r.KeySize = 256;
+			r.Key = pbKey;
+			ICryptoTransform iCrypt = r.CreateEncryptor();
+
+			// !iCrypt.CanReuseTransform -- doesn't work with Mono
+			if((iCrypt == null) || (iCrypt.InputBlockSize != 16) ||
+				(iCrypt.OutputBlockSize != 16))
+			{
+				Debug.Assert(false, "Invalid ICryptoTransform.");
+				Debug.Assert(iCrypt.InputBlockSize == 16, "Invalid input block size!");
+				Debug.Assert(iCrypt.OutputBlockSize == 16, "Invalid output block size!");
+
+				p.SetUInt64(ParamRounds, PwDefs.DefaultKeyEncryptionRounds);
+				return p;
+			}
+#endif
+
+			uRounds = 0;
+			int tStart = Environment.TickCount;
+			while(true)
+			{
+				for(ulong j = 0; j < uStep; ++j)
+				{
+#if KeePassUAP
+					aes.ProcessBlock(pbNewKey, 0, pbNewKey, 0);
+					aes.ProcessBlock(pbNewKey, 16, pbNewKey, 16);
+#else
+					iCrypt.TransformBlock(pbNewKey, 0, 16, pbNewKey, 0);
+					iCrypt.TransformBlock(pbNewKey, 16, 16, pbNewKey, 16);
+#endif
+				}
+
+				uRounds += uStep;
+				if(uRounds < uStep) // Overflow check
+				{
+					uRounds = ulong.MaxValue;
+					break;
+				}
+
+				uint tElapsed = (uint)(Environment.TickCount - tStart);
+				if(tElapsed > uMilliseconds) break;
+			}
+
+			p.SetUInt64(ParamRounds, uRounds);
+			return p;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/Argon2Kdf.Core.cs

@@ -0,0 +1,682 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+// This implementation is based on the official reference C
+// implementation by Daniel Dinu and Dmitry Khovratovich (CC0 1.0).
+
+// Relative iterations (* = B2ROUND_ARRAYS \\ G_INLINED):
+//     * | false true
+// ------+-----------
+// false |  8885 9618
+//  true |  9009 9636
+#define ARGON2_B2ROUND_ARRAYS
+#define ARGON2_G_INLINED
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading;
+
+using KeePassLib.Cryptography.Hash;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+	public sealed partial class Argon2Kdf : KdfEngine
+	{
+		private const ulong NbBlockSize = 1024;
+		private const ulong NbBlockSizeInQW = NbBlockSize / 8UL;
+		private const ulong NbSyncPoints = 4;
+
+        private const ulong NbAddressesInBlock = 128;
+
+		private const int NbPreHashDigestLength = 64;
+		private const int NbPreHashSeedLength = NbPreHashDigestLength + 8;
+
+#if ARGON2_B2ROUND_ARRAYS
+		private static int[][] g_vFBCols = null;
+		private static int[][] g_vFBRows = null;
+#endif
+
+		private sealed class Argon2Ctx
+		{
+            public Argon2Type Type = Argon2Type.D;
+			public uint Version = 0;
+
+			public ulong Lanes = 0;
+			public ulong TCost = 0;
+			public ulong MCost = 0;
+			public ulong MemoryBlocks = 0;
+			public ulong SegmentLength = 0;
+			public ulong LaneLength = 0;
+
+			public ulong[] Mem = null;
+		}
+
+		private sealed class Argon2ThreadInfo
+		{
+			public Argon2Ctx Context = null;
+			public ManualResetEvent Finished = new ManualResetEvent(false);
+
+			public ulong Pass = 0;
+			public ulong Lane = 0;
+			public ulong Slice = 0;
+			public ulong Index = 0;
+
+			public void Release()
+			{
+				if(this.Finished != null)
+				{
+					this.Finished.Close();
+					this.Finished = null;
+				}
+				else { Debug.Assert(false); }
+			}
+		}
+
+        private byte[] Argon2Transform(byte[] pbMsg, byte[] pbSalt, uint uParallel,
+            ulong uMem, ulong uIt, int cbOut, uint uVersion, byte[] pbSecretKey,
+            byte[] pbAssocData)
+		{
+			pbSecretKey = (pbSecretKey ?? MemUtil.EmptyByteArray);
+			pbAssocData = (pbAssocData ?? MemUtil.EmptyByteArray);
+
+#if ARGON2_B2ROUND_ARRAYS
+			InitB2RoundIndexArrays();
+#endif
+
+			Argon2Ctx ctx = new Argon2Ctx();
+            ctx.Type = m_t;
+			ctx.Version = uVersion;
+
+			ctx.Lanes = uParallel;
+			ctx.TCost = uIt;
+			ctx.MCost = uMem / NbBlockSize;
+			ctx.MemoryBlocks = Math.Max(ctx.MCost, 2UL * NbSyncPoints * ctx.Lanes);
+
+			ctx.SegmentLength = ctx.MemoryBlocks / (ctx.Lanes * NbSyncPoints);
+			ctx.MemoryBlocks = ctx.SegmentLength * ctx.Lanes * NbSyncPoints;
+
+			ctx.LaneLength = ctx.SegmentLength * NbSyncPoints;
+
+			Debug.Assert(NbBlockSize == (NbBlockSizeInQW *
+#if KeePassUAP
+				(ulong)Marshal.SizeOf<ulong>()
+#else
+				(ulong)Marshal.SizeOf(typeof(ulong))
+#endif
+				));
+			ctx.Mem = new ulong[ctx.MemoryBlocks * NbBlockSizeInQW];
+
+			Blake2b h = new Blake2b();
+
+			// Initial hash
+			Debug.Assert(h.HashSize == (NbPreHashDigestLength * 8));
+			byte[] pbBuf = new byte[4];
+			MemUtil.UInt32ToBytesEx(uParallel, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			MemUtil.UInt32ToBytesEx((uint)cbOut, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			MemUtil.UInt32ToBytesEx((uint)ctx.MCost, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			MemUtil.UInt32ToBytesEx((uint)uIt, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			MemUtil.UInt32ToBytesEx(uVersion, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+            MemUtil.UInt32ToBytesEx((uint)m_t, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			MemUtil.UInt32ToBytesEx((uint)pbMsg.Length, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			h.TransformBlock(pbMsg, 0, pbMsg.Length, pbMsg, 0);
+			MemUtil.UInt32ToBytesEx((uint)pbSalt.Length, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			h.TransformBlock(pbSalt, 0, pbSalt.Length, pbSalt, 0);
+			MemUtil.UInt32ToBytesEx((uint)pbSecretKey.Length, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			h.TransformBlock(pbSecretKey, 0, pbSecretKey.Length, pbSecretKey, 0);
+			MemUtil.UInt32ToBytesEx((uint)pbAssocData.Length, pbBuf, 0);
+			h.TransformBlock(pbBuf, 0, pbBuf.Length, pbBuf, 0);
+			h.TransformBlock(pbAssocData, 0, pbAssocData.Length, pbAssocData, 0);
+			h.TransformFinalBlock(MemUtil.EmptyByteArray, 0, 0);
+			byte[] pbH0 = h.Hash;
+			Debug.Assert(pbH0.Length == 64);
+
+			byte[] pbBlockHash = new byte[NbPreHashSeedLength];
+			Array.Copy(pbH0, pbBlockHash, pbH0.Length);
+			MemUtil.ZeroByteArray(pbH0);
+
+			FillFirstBlocks(ctx, pbBlockHash, h);
+			MemUtil.ZeroByteArray(pbBlockHash);
+
+			FillMemoryBlocks(ctx);
+
+			byte[] pbOut = FinalHash(ctx, cbOut, h);
+
+			h.Clear();
+			MemUtil.ZeroArray<ulong>(ctx.Mem);
+			return pbOut;
+		}
+
+		private static void LoadBlock(ulong[] pqDst, ulong uDstOffset, byte[] pbIn)
+		{
+			// for(ulong i = 0; i < NbBlockSizeInQW; ++i)
+			//	pqDst[uDstOffset + i] = MemUtil.BytesToUInt64(pbIn, (int)(i << 3));
+
+			Debug.Assert((uDstOffset + NbBlockSizeInQW - 1UL) <= (ulong)int.MaxValue);
+			int iDstOffset = (int)uDstOffset;
+			for(int i = 0; i < (int)NbBlockSizeInQW; ++i)
+				pqDst[iDstOffset + i] = MemUtil.BytesToUInt64(pbIn, i << 3);
+		}
+
+		private static void StoreBlock(byte[] pbDst, ulong[] pqSrc)
+		{
+			for(int i = 0; i < (int)NbBlockSizeInQW; ++i)
+				MemUtil.UInt64ToBytesEx(pqSrc[i], pbDst, i << 3);
+		}
+
+		private static void CopyBlock(ulong[] vDst, ulong uDstOffset, ulong[] vSrc,
+			ulong uSrcOffset)
+		{
+			// for(ulong i = 0; i < NbBlockSizeInQW; ++i)
+			//	vDst[uDstOffset + i] = vSrc[uSrcOffset + i];
+
+			// Debug.Assert((uDstOffset + NbBlockSizeInQW - 1UL) <= (ulong)int.MaxValue);
+			// Debug.Assert((uSrcOffset + NbBlockSizeInQW - 1UL) <= (ulong)int.MaxValue);
+			// int iDstOffset = (int)uDstOffset;
+			// int iSrcOffset = (int)uSrcOffset;
+			// for(int i = 0; i < (int)NbBlockSizeInQW; ++i)
+			//	vDst[iDstOffset + i] = vSrc[iSrcOffset + i];
+
+#if KeePassUAP
+			Array.Copy(vSrc, (int)uSrcOffset, vDst, (int)uDstOffset,
+				(int)NbBlockSizeInQW);
+#else
+			Array.Copy(vSrc, (long)uSrcOffset, vDst, (long)uDstOffset,
+				(long)NbBlockSizeInQW);
+#endif
+		}
+
+		private static void XorBlock(ulong[] vDst, ulong uDstOffset, ulong[] vSrc,
+			ulong uSrcOffset)
+		{
+			// for(ulong i = 0; i < NbBlockSizeInQW; ++i)
+			//	vDst[uDstOffset + i] ^= vSrc[uSrcOffset + i];
+
+			Debug.Assert((uDstOffset + NbBlockSizeInQW - 1UL) <= (ulong)int.MaxValue);
+			Debug.Assert((uSrcOffset + NbBlockSizeInQW - 1UL) <= (ulong)int.MaxValue);
+			int iDstOffset = (int)uDstOffset;
+			int iSrcOffset = (int)uSrcOffset;
+			for(int i = 0; i < (int)NbBlockSizeInQW; ++i)
+				vDst[iDstOffset + i] ^= vSrc[iSrcOffset + i];
+		}
+
+		private static void Blake2bLong(byte[] pbOut, int cbOut,
+			byte[] pbIn, int cbIn, Blake2b h)
+		{
+			Debug.Assert((h != null) && (h.HashSize == (64 * 8)));
+
+			byte[] pbOutLen = new byte[4];
+			MemUtil.UInt32ToBytesEx((uint)cbOut, pbOutLen, 0);
+
+			if(cbOut <= 64)
+			{
+				Blake2b hOut = ((cbOut == 64) ? h : new Blake2b(cbOut));
+				if(cbOut == 64) hOut.Initialize();
+
+				hOut.TransformBlock(pbOutLen, 0, pbOutLen.Length, pbOutLen, 0);
+				hOut.TransformBlock(pbIn, 0, cbIn, pbIn, 0);
+				hOut.TransformFinalBlock(MemUtil.EmptyByteArray, 0, 0);
+
+				Array.Copy(hOut.Hash, pbOut, cbOut);
+
+				if(cbOut < 64) hOut.Clear();
+				return;
+			}
+
+			h.Initialize();
+			h.TransformBlock(pbOutLen, 0, pbOutLen.Length, pbOutLen, 0);
+			h.TransformBlock(pbIn, 0, cbIn, pbIn, 0);
+			h.TransformFinalBlock(MemUtil.EmptyByteArray, 0, 0);
+
+			byte[] pbOutBuffer = new byte[64];
+			Array.Copy(h.Hash, pbOutBuffer, pbOutBuffer.Length);
+
+			int ibOut = 64 / 2;
+			Array.Copy(pbOutBuffer, pbOut, ibOut);
+			int cbToProduce = cbOut - ibOut;
+
+			h.Initialize();
+			while(cbToProduce > 64)
+			{
+				byte[] pbHash = h.ComputeHash(pbOutBuffer);
+				Array.Copy(pbHash, pbOutBuffer, 64);
+
+				Array.Copy(pbHash, 0, pbOut, ibOut, 64 / 2);
+				ibOut += 64 / 2;
+				cbToProduce -= 64 / 2;
+
+				MemUtil.ZeroByteArray(pbHash);
+			}
+
+			using(Blake2b hOut = new Blake2b(cbToProduce))
+			{
+				byte[] pbHash = hOut.ComputeHash(pbOutBuffer);
+				Array.Copy(pbHash, 0, pbOut, ibOut, cbToProduce);
+
+				MemUtil.ZeroByteArray(pbHash);
+			}
+
+			MemUtil.ZeroByteArray(pbOutBuffer);
+		}
+
+#if !ARGON2_G_INLINED
+		private static ulong BlaMka(ulong x, ulong y)
+		{
+			ulong xy = (x & 0xFFFFFFFFUL) * (y & 0xFFFFFFFFUL);
+			return (x + y + (xy << 1));
+		}
+
+		private static void G(ulong[] v, int a, int b, int c, int d)
+		{
+			ulong va = v[a], vb = v[b], vc = v[c], vd = v[d];
+
+			va = BlaMka(va, vb);
+			vd = MemUtil.RotateRight64(vd ^ va, 32);
+			vc = BlaMka(vc, vd);
+			vb = MemUtil.RotateRight64(vb ^ vc, 24);
+			va = BlaMka(va, vb);
+			vd = MemUtil.RotateRight64(vd ^ va, 16);
+			vc = BlaMka(vc, vd);
+			vb = MemUtil.RotateRight64(vb ^ vc, 63);
+
+			v[a] = va;
+			v[b] = vb;
+			v[c] = vc;
+			v[d] = vd;
+		}
+#else
+		private static void G(ulong[] v, int a, int b, int c, int d)
+		{
+			ulong va = v[a], vb = v[b], vc = v[c], vd = v[d];
+
+			ulong xy = (va & 0xFFFFFFFFUL) * (vb & 0xFFFFFFFFUL);
+			va += vb + (xy << 1);
+
+			vd = MemUtil.RotateRight64(vd ^ va, 32);
+
+			xy = (vc & 0xFFFFFFFFUL) * (vd & 0xFFFFFFFFUL);
+			vc += vd + (xy << 1);
+
+			vb = MemUtil.RotateRight64(vb ^ vc, 24);
+
+			xy = (va & 0xFFFFFFFFUL) * (vb & 0xFFFFFFFFUL);
+			va += vb + (xy << 1);
+
+			vd = MemUtil.RotateRight64(vd ^ va, 16);
+
+			xy = (vc & 0xFFFFFFFFUL) * (vd & 0xFFFFFFFFUL);
+			vc += vd + (xy << 1);
+
+			vb = MemUtil.RotateRight64(vb ^ vc, 63);
+
+			v[a] = va;
+			v[b] = vb;
+			v[c] = vc;
+			v[d] = vd;
+		}
+#endif
+
+#if ARGON2_B2ROUND_ARRAYS
+		private static void Blake2RoundNoMsg(ulong[] pbR, int[] v)
+		{
+			G(pbR, v[0], v[4], v[8], v[12]);
+			G(pbR, v[1], v[5], v[9], v[13]);
+			G(pbR, v[2], v[6], v[10], v[14]);
+			G(pbR, v[3], v[7], v[11], v[15]);
+			G(pbR, v[0], v[5], v[10], v[15]);
+			G(pbR, v[1], v[6], v[11], v[12]);
+			G(pbR, v[2], v[7], v[8], v[13]);
+			G(pbR, v[3], v[4], v[9], v[14]);
+		}
+#else
+		private static void Blake2RoundNoMsgCols16i(ulong[] pbR, int i)
+		{
+			G(pbR, i,     i + 4, i +  8, i + 12);
+			G(pbR, i + 1, i + 5, i +  9, i + 13);
+			G(pbR, i + 2, i + 6, i + 10, i + 14);
+			G(pbR, i + 3, i + 7, i + 11, i + 15);
+			G(pbR, i,     i + 5, i + 10, i + 15);
+			G(pbR, i + 1, i + 6, i + 11, i + 12);
+			G(pbR, i + 2, i + 7, i +  8, i + 13);
+			G(pbR, i + 3, i + 4, i +  9, i + 14);
+		}
+
+		private static void Blake2RoundNoMsgRows2i(ulong[] pbR, int i)
+		{
+			G(pbR, i,      i + 32, i + 64, i +  96);
+			G(pbR, i +  1, i + 33, i + 65, i +  97);
+			G(pbR, i + 16, i + 48, i + 80, i + 112);
+			G(pbR, i + 17, i + 49, i + 81, i + 113);
+			G(pbR, i,      i + 33, i + 80, i + 113);
+			G(pbR, i +  1, i + 48, i + 81, i +  96);
+			G(pbR, i + 16, i + 49, i + 64, i +  97);
+			G(pbR, i + 17, i + 32, i + 65, i + 112);
+		}
+#endif
+
+		private static void FillFirstBlocks(Argon2Ctx ctx, byte[] pbBlockHash,
+			Blake2b h)
+		{
+			byte[] pbBlock = new byte[NbBlockSize];
+
+			for(ulong l = 0; l < ctx.Lanes; ++l)
+			{
+				MemUtil.UInt32ToBytesEx(0, pbBlockHash, NbPreHashDigestLength);
+				MemUtil.UInt32ToBytesEx((uint)l, pbBlockHash, NbPreHashDigestLength + 4);
+
+				Blake2bLong(pbBlock, (int)NbBlockSize, pbBlockHash,
+					NbPreHashSeedLength, h);
+				LoadBlock(ctx.Mem, l * ctx.LaneLength * NbBlockSizeInQW, pbBlock);
+
+				MemUtil.UInt32ToBytesEx(1, pbBlockHash, NbPreHashDigestLength);
+
+				Blake2bLong(pbBlock, (int)NbBlockSize, pbBlockHash,
+					NbPreHashSeedLength, h);
+				LoadBlock(ctx.Mem, (l * ctx.LaneLength + 1UL) * NbBlockSizeInQW, pbBlock);
+			}
+
+			MemUtil.ZeroByteArray(pbBlock);
+		}
+
+		private static ulong IndexAlpha(Argon2Ctx ctx, Argon2ThreadInfo ti,
+			uint uPseudoRand, bool bSameLane)
+		{
+			ulong uRefAreaSize;
+			if(ti.Pass == 0)
+			{
+				if(ti.Slice == 0)
+				{
+					Debug.Assert(ti.Index > 0);
+					uRefAreaSize = ti.Index - 1UL;
+				}
+				else
+				{
+					if(bSameLane)
+						uRefAreaSize = ti.Slice * ctx.SegmentLength +
+							ti.Index - 1UL;
+					else
+						uRefAreaSize = ti.Slice * ctx.SegmentLength -
+							((ti.Index == 0UL) ? 1UL : 0UL);
+				}
+			}
+			else
+			{
+				if(bSameLane)
+					uRefAreaSize = ctx.LaneLength - ctx.SegmentLength +
+						ti.Index - 1UL;
+				else
+					uRefAreaSize = ctx.LaneLength - ctx.SegmentLength -
+						((ti.Index == 0) ? 1UL : 0UL);
+			}
+			Debug.Assert(uRefAreaSize <= (ulong)uint.MaxValue);
+
+			ulong uRelPos = uPseudoRand;
+			uRelPos = (uRelPos * uRelPos) >> 32;
+			uRelPos = uRefAreaSize - 1UL - ((uRefAreaSize * uRelPos) >> 32);
+
+			ulong uStart = 0;
+			if(ti.Pass != 0)
+				uStart = (((ti.Slice + 1UL) == NbSyncPoints) ? 0UL :
+					((ti.Slice + 1UL) * ctx.SegmentLength));
+			Debug.Assert(uStart <= (ulong)uint.MaxValue);
+
+			Debug.Assert(ctx.LaneLength <= (ulong)uint.MaxValue);
+			return ((uStart + uRelPos) % ctx.LaneLength);
+		}
+
+		private static void FillMemoryBlocks(Argon2Ctx ctx)
+		{
+			int np = (int)ctx.Lanes;
+			Argon2ThreadInfo[] v = new Argon2ThreadInfo[np];
+
+			for(ulong r = 0; r < ctx.TCost; ++r)
+			{
+				for(ulong s = 0; s < NbSyncPoints; ++s)
+				{
+					for(int l = 0; l < np; ++l)
+					{
+						Argon2ThreadInfo ti = new Argon2ThreadInfo();
+						ti.Context = ctx;
+
+						ti.Pass = r;
+						ti.Lane = (ulong)l;
+						ti.Slice = s;
+
+						if(!ThreadPool.QueueUserWorkItem(FillSegmentThr, ti))
+						{
+							Debug.Assert(false);
+							throw new OutOfMemoryException();
+						}
+
+						v[l] = ti;
+					}
+
+					for(int l = 0; l < np; ++l)
+					{
+						v[l].Finished.WaitOne();
+						v[l].Release();
+					}
+				}
+			}
+		}
+
+		private static void FillSegmentThr(object o)
+		{
+			Argon2ThreadInfo ti = (o as Argon2ThreadInfo);
+			if (ti == null) { Debug.Assert(false); return; }
+
+			try
+			{
+				Argon2Ctx ctx = ti.Context;
+				if (ctx == null) { Debug.Assert(false); return; }
+
+				Debug.Assert(ctx.Version >= MinVersion);
+				bool bCanXor = (ctx.Version >= 0x13U);
+
+				ulong[] pbR = new ulong[NbBlockSizeInQW];
+				ulong[] pbTmp = new ulong[NbBlockSizeInQW];
+				ulong[] pbAddrInputZero = null;
+
+				bool bDataIndependentAddr = ((ctx.Type == Argon2Type.ID) &&
+					(ti.Pass == 0) && (ti.Slice < (NbSyncPoints / 2)));
+				if (bDataIndependentAddr)
+				{
+					pbAddrInputZero = new ulong[NbBlockSizeInQW * 3];
+
+					const int iInput = (int)NbBlockSizeInQW;
+					pbAddrInputZero[iInput] = ti.Pass;
+					pbAddrInputZero[iInput + 1] = ti.Lane;
+					pbAddrInputZero[iInput + 2] = ti.Slice;
+					pbAddrInputZero[iInput + 3] = ctx.MemoryBlocks;
+					pbAddrInputZero[iInput + 4] = ctx.TCost;
+					pbAddrInputZero[iInput + 5] = (ulong)ctx.Type;
+				}
+
+				ulong uStart = 0;
+				if ((ti.Pass == 0) && (ti.Slice == 0))
+				{
+					uStart = 2;
+
+					if (bDataIndependentAddr)
+						NextAddresses(pbAddrInputZero, pbR, pbTmp);
+				}
+
+				ulong uCur = (ti.Lane * ctx.LaneLength) + (ti.Slice *
+					ctx.SegmentLength) + uStart;
+
+				ulong uPrev = (((uCur % ctx.LaneLength) == 0) ?
+					(uCur + ctx.LaneLength - 1UL) : (uCur - 1UL));
+
+				for (ulong i = uStart; i < ctx.SegmentLength; ++i)
+				{
+					if ((uCur % ctx.LaneLength) == 1)
+						uPrev = uCur - 1UL;
+
+					ulong uPseudoRand;
+					if (bDataIndependentAddr)
+					{
+						ulong iMod = i % NbAddressesInBlock;
+						if (iMod == 0)
+							NextAddresses(pbAddrInputZero, pbR, pbTmp);
+						uPseudoRand = pbAddrInputZero[iMod];
+					}
+					else uPseudoRand = ctx.Mem[uPrev * NbBlockSizeInQW];
+
+					ulong uRefLane = (uPseudoRand >> 32) % ctx.Lanes;
+					if ((ti.Pass == 0) && (ti.Slice == 0))
+						uRefLane = ti.Lane;
+
+					ti.Index = i;
+					ulong uRefIndex = IndexAlpha(ctx, ti, (uint)uPseudoRand,
+						(uRefLane == ti.Lane));
+
+					ulong uRefBlockIndex = (ctx.LaneLength * uRefLane +
+						uRefIndex) * NbBlockSizeInQW;
+					ulong uCurBlockIndex = uCur * NbBlockSizeInQW;
+
+					FillBlock(ctx.Mem, uPrev * NbBlockSizeInQW, uRefBlockIndex,
+						uCurBlockIndex, ((ti.Pass != 0) && bCanXor), pbR, pbTmp);
+
+					++uCur;
+					++uPrev;
+				}
+
+				MemUtil.ZeroArray<ulong>(pbR);
+				MemUtil.ZeroArray<ulong>(pbTmp);
+				if (pbAddrInputZero != null) MemUtil.ZeroArray<ulong>(pbAddrInputZero);
+			}
+			catch (Exception) { Debug.Assert(false); }
+
+			try { ti.Finished.Set(); }
+			catch (Exception) { Debug.Assert(false); }
+		}
+
+#if ARGON2_B2ROUND_ARRAYS
+		private static void InitB2RoundIndexArrays()
+		{
+			int[][] vCols = g_vFBCols;
+			if(vCols == null)
+			{
+				vCols = new int[8][];
+				Debug.Assert(vCols.Length == 8);
+				int e = 0;
+				for(int i = 0; i < 8; ++i)
+				{
+					vCols[i] = new int[16];
+					for(int j = 0; j < 16; ++j)
+					{
+						vCols[i][j] = e;
+						++e;
+					}
+				}
+
+				g_vFBCols = vCols;
+			}
+
+			int[][] vRows = g_vFBRows;
+			if(vRows == null)
+			{
+				vRows = new int[8][];
+				for(int i = 0; i < 8; ++i)
+				{
+					vRows[i] = new int[16];
+					for(int j = 0; j < 16; ++j)
+					{
+						int jh = j / 2;
+						vRows[i][j] = (2 * i) + (16 * jh) + (j & 1);
+					}
+				}
+
+				g_vFBRows = vRows;
+			}
+		}
+#endif
+
+		private static void FillBlock(ulong[] pMem, ulong uPrev, ulong uRef,
+			ulong uNext, bool bXor, ulong[] pbR, ulong[] pbTmp)
+		{
+			CopyBlock(pbR, 0, pMem, uRef);
+			XorBlock(pbR, 0, pMem, uPrev);
+			CopyBlock(pbTmp, 0, pbR, 0);
+			if(bXor) XorBlock(pbTmp, 0, pMem, uNext);
+
+#if ARGON2_B2ROUND_ARRAYS
+			int[][] vCols = g_vFBCols;
+			int[][] vRows = g_vFBRows;
+			for(int i = 0; i < 8; ++i)
+				Blake2RoundNoMsg(pbR, vCols[i]);
+			for(int i = 0; i < 8; ++i)
+				Blake2RoundNoMsg(pbR, vRows[i]);
+#else
+			for(int i = 0; i < (8 * 16); i += 16)
+				Blake2RoundNoMsgCols16i(pbR, i);
+			for(int i = 0; i < (8 * 2); i += 2)
+				Blake2RoundNoMsgRows2i(pbR, i);
+#endif
+
+			CopyBlock(pMem, uNext, pbTmp, 0);
+			XorBlock(pMem, uNext, pbR, 0);
+		}
+
+        private static void NextAddresses(ulong[] pbAddrInputZero, ulong[] pbR,
+            ulong[] pbTmp)
+        {
+            // pbAddrInputZero contains an address block, an input block and a zero block
+            const ulong uAddr = 0;
+            const ulong uInput = NbBlockSizeInQW;
+            const ulong uZero = NbBlockSizeInQW * 2;
+
+            ++pbAddrInputZero[uInput + 6];
+            FillBlock(pbAddrInputZero, uZero, uInput, uAddr, false, pbR, pbTmp);
+            FillBlock(pbAddrInputZero, uZero, uAddr, uAddr, false, pbR, pbTmp);
+        }
+
+		private static byte[] FinalHash(Argon2Ctx ctx, int cbOut, Blake2b h)
+		{
+			ulong[] pqBlockHash = new ulong[NbBlockSizeInQW];
+			CopyBlock(pqBlockHash, 0, ctx.Mem, (ctx.LaneLength - 1UL) *
+				NbBlockSizeInQW);
+			for(ulong l = 1; l < ctx.Lanes; ++l)
+				XorBlock(pqBlockHash, 0, ctx.Mem, (l * ctx.LaneLength +
+					ctx.LaneLength - 1UL) * NbBlockSizeInQW);
+
+			byte[] pbBlockHashBytes = new byte[NbBlockSize];
+			StoreBlock(pbBlockHashBytes, pqBlockHash);
+
+			byte[] pbOut = new byte[cbOut];
+			Blake2bLong(pbOut, cbOut, pbBlockHashBytes, (int)NbBlockSize, h);
+
+			MemUtil.ZeroArray<ulong>(pqBlockHash);
+			MemUtil.ZeroByteArray(pbBlockHashBytes);
+			return pbOut;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/Argon2Kdf.cs

@@ -0,0 +1,226 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+    public enum Argon2Type
+    {
+        // The values must be the same as in the Argon2 specification
+        D = 0,
+        ID = 2
+    }
+    public sealed partial class Argon2Kdf : KdfEngine
+	{
+       
+
+        private static readonly PwUuid g_uuidD = new PwUuid(new byte[] {
+            0xEF, 0x63, 0x6D, 0xDF, 0x8C, 0x29, 0x44, 0x4B,
+            0x91, 0xF7, 0xA9, 0xA4, 0x03, 0xE3, 0x0A, 0x0C });
+        private static readonly PwUuid g_uuidID = new PwUuid(new byte[] {
+            0x9E, 0x29, 0x8B, 0x19, 0x56, 0xDB, 0x47, 0x73,
+            0xB2, 0x3D, 0xFC, 0x3E, 0xC6, 0xF0, 0xA1, 0xE6 });
+
+		public const string ParamSalt = "S"; // Byte[]
+		public const string ParamParallelism = "P"; // UInt32
+		public const string ParamMemory = "M"; // UInt64
+		public const string ParamIterations = "I"; // UInt64
+		public const string ParamVersion = "V"; // UInt32
+		public const string ParamSecretKey = "K"; // Byte[]
+		public const string ParamAssocData = "A"; // Byte[]
+
+		private const uint MinVersion = 0x10;
+		private const uint MaxVersion = 0x13;
+
+		private const int MinSalt = 8;
+		private const int MaxSalt = int.MaxValue; // .NET limit; 2^32 - 1 in spec
+
+		internal const ulong MinIterations = 1;
+		internal const ulong MaxIterations = uint.MaxValue;
+
+		internal const ulong MinMemory = 1024 * 8; // For parallelism = 1
+		// internal const ulong MaxMemory = (ulong)uint.MaxValue * 1024UL; // Spec
+		internal const ulong MaxMemory = int.MaxValue; // .NET limit
+
+		internal const uint MinParallelism = 1;
+		internal const uint MaxParallelism = (1 << 24) - 1;
+
+        internal const ulong DefaultIterations = 2;
+        internal const ulong DefaultMemory = 64 * 1024 * 1024; // 64 MB
+        internal const uint DefaultParallelism = 2;
+
+        private readonly Argon2Type m_t;
+
+        public override PwUuid Uuid
+        {
+            get { return ((m_t == Argon2Type.D) ? g_uuidD : g_uuidID); }
+        }
+
+        public override string Name
+        {
+            get { return ((m_t == Argon2Type.D) ? "Argon2d" : "Argon2id"); }
+        }
+
+        public Argon2Kdf() : this(Argon2Type.D)
+        {
+        }
+
+        public Argon2Kdf(Argon2Type t)
+        {
+            if ((t != Argon2Type.D) && (t != Argon2Type.ID))
+                throw new NotSupportedException();
+
+            m_t = t;
+        }
+        public override byte[] GetSeed(KdfParameters p)
+        { return p.GetByteArray(ParamSalt); }
+
+        public override KdfParameters GetDefaultParameters()
+		{
+			KdfParameters p = base.GetDefaultParameters();
+
+			p.SetUInt32(ParamVersion, MaxVersion);
+
+			p.SetUInt64(ParamIterations, DefaultIterations);
+			p.SetUInt64(ParamMemory, DefaultMemory);
+			p.SetUInt32(ParamParallelism, DefaultParallelism);
+
+			return p;
+		}
+
+		public override void Randomize(KdfParameters p)
+		{
+			if(p == null) { Debug.Assert(false); return; }
+            Debug.Assert(p.KdfUuid.Equals(this.Uuid));
+
+			byte[] pb = CryptoRandom.Instance.GetRandomBytes(32);
+			p.SetByteArray(ParamSalt, pb);
+		}
+
+		public override byte[] Transform(byte[] pbMsg, KdfParameters p)
+		{
+			if(pbMsg == null) throw new ArgumentNullException("pbMsg");
+			if(p == null) throw new ArgumentNullException("p");
+
+			byte[] pbSalt = p.GetByteArray(ParamSalt);
+			if(pbSalt == null)
+				throw new ArgumentNullException("p.Salt");
+			if((pbSalt.Length < MinSalt) || (pbSalt.Length > MaxSalt))
+				throw new ArgumentOutOfRangeException("p.Salt");
+
+			uint uPar = p.GetUInt32(ParamParallelism, 0);
+			if((uPar < MinParallelism) || (uPar > MaxParallelism))
+				throw new ArgumentOutOfRangeException("p.Parallelism");
+
+			ulong uMem = p.GetUInt64(ParamMemory, 0);
+			if((uMem < MinMemory) || (uMem > MaxMemory))
+				throw new ArgumentOutOfRangeException("p.Memory");
+
+			ulong uIt = p.GetUInt64(ParamIterations, 0);
+			if((uIt < MinIterations) || (uIt > MaxIterations))
+				throw new ArgumentOutOfRangeException("p.Iterations");
+
+			uint v = p.GetUInt32(ParamVersion, 0);
+			if((v < MinVersion) || (v > MaxVersion))
+				throw new ArgumentOutOfRangeException("p.Version");
+
+			byte[] pbSecretKey = p.GetByteArray(ParamSecretKey);
+			byte[] pbAssocData = p.GetByteArray(ParamAssocData);
+
+            byte[] pbRet;
+
+			if (m_t == Argon2Type.ID)
+            {
+                 pbRet = Argon2Transform(pbMsg, pbSalt, uPar, uMem,
+                    uIt, 32, v, pbSecretKey, pbAssocData);
+			}
+            else
+            {
+                if (pbSecretKey != null)
+                {
+                    throw new ArgumentOutOfRangeException("Unsupported configuration: non-null pbSecretKey");
+                }
+
+                if (pbAssocData != null)
+                {
+                    throw new ArgumentOutOfRangeException("Unsupported configuration: non-null pbAssocData");
+                }
+
+                /*
+                byte[] pbRet = Argon2d(pbMsg, pbSalt, uPar, uMem, uIt,
+                    32, v, pbSecretKey, pbAssocData);
+                */
+
+                IntPtr msgPtr = Marshal.AllocHGlobal(pbMsg.Length);
+                IntPtr saltPtr = Marshal.AllocHGlobal(pbSalt.Length);
+                IntPtr retPtr = Marshal.AllocHGlobal(32);
+                Marshal.Copy(pbMsg, 0, msgPtr, pbMsg.Length);
+                Marshal.Copy(pbSalt, 0, saltPtr, pbSalt.Length);
+
+                const UInt32 Argon2_d = 0;
+
+                int ret = argon2_hash(
+                    (UInt32)uIt, (UInt32)(uMem / 1024), uPar,
+                    msgPtr, (IntPtr)pbMsg.Length,
+                    saltPtr, (IntPtr)pbSalt.Length,
+                    retPtr, (IntPtr)32,
+                    (IntPtr)0, (IntPtr)0, Argon2_d, v);
+
+                if (ret != 0)
+                {
+                    throw new Exception("argon2_hash failed with " + ret);
+                }
+
+                pbRet = new byte[32];
+                Marshal.Copy(retPtr, pbRet, 0, 32);
+
+                Marshal.FreeHGlobal(msgPtr);
+                Marshal.FreeHGlobal(saltPtr);
+                Marshal.FreeHGlobal(retPtr);
+			}
+
+            if(uMem > (100UL * 1024UL * 1024UL)) GC.Collect();
+			return pbRet;
+		}
+
+		public override KdfParameters GetBestParameters(uint uMilliseconds)
+		{
+			KdfParameters p = GetDefaultParameters();
+			Randomize(p);
+
+			MaximizeParamUInt64(p, ParamIterations, MinIterations,
+				MaxIterations, uMilliseconds, true);
+			return p;
+		}
+
+		[DllImport("argon2")]
+		static extern int argon2_hash(
+				UInt32 t_cost, UInt32 m_cost, UInt32 parallelism,
+				IntPtr pwd, IntPtr pwdlen,
+				IntPtr salt, IntPtr saltlen,
+				IntPtr hash, IntPtr hashlen,
+				IntPtr encoded, IntPtr encodedlen,
+				UInt32 type, UInt32 version);
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/KdfEngine.cs

@@ -0,0 +1,144 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+	public abstract class KdfEngine
+	{
+		public abstract PwUuid Uuid
+		{
+			get;
+		}
+
+		public abstract string Name
+		{
+			get;
+		}
+
+        public abstract byte[] GetSeed(KdfParameters p);
+
+        public virtual KdfParameters GetDefaultParameters()
+		{
+			return new KdfParameters(this.Uuid);
+		}
+
+		/// <summary>
+		/// Generate random seeds and store them in <paramref name="p" />.
+		/// </summary>
+		public virtual void Randomize(KdfParameters p)
+		{
+			Debug.Assert(p != null);
+			Debug.Assert(p.KdfUuid.Equals(this.Uuid));
+		}
+
+		public abstract byte[] Transform(byte[] pbMsg, KdfParameters p);
+
+		public virtual KdfParameters GetBestParameters(uint uMilliseconds)
+		{
+			throw new NotImplementedException();
+		}
+
+		protected void MaximizeParamUInt64(KdfParameters p, string strName,
+			ulong uMin, ulong uMax, uint uMilliseconds, bool bInterpSearch)
+		{
+			if(p == null) { Debug.Assert(false); return; }
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return; }
+			if(uMin > uMax) { Debug.Assert(false); return; }
+
+			if(uMax > (ulong.MaxValue >> 1))
+			{
+				Debug.Assert(false);
+				uMax = ulong.MaxValue >> 1;
+
+				if(uMin > uMax) { p.SetUInt64(strName, uMin); return; }
+			}
+
+			byte[] pbMsg = new byte[32];
+			for(int i = 0; i < pbMsg.Length; ++i) pbMsg[i] = (byte)i;
+
+			ulong uLow = uMin;
+			ulong uHigh = uMin + 1UL;
+			long tLow = 0;
+			long tHigh = 0;
+			long tTarget = (long)uMilliseconds;
+
+			// Determine range
+			while(uHigh <= uMax)
+			{
+				p.SetUInt64(strName, uHigh);
+
+				// GC.Collect();
+				Stopwatch sw = Stopwatch.StartNew();
+				Transform(pbMsg, p);
+				sw.Stop();
+
+				tHigh = sw.ElapsedMilliseconds;
+				if(tHigh > tTarget) break;
+
+				uLow = uHigh;
+				tLow = tHigh;
+				uHigh <<= 1;
+			}
+			if(uHigh > uMax) { uHigh = uMax; tHigh = 0; }
+			if(uLow > uHigh) uLow = uHigh; // Skips to end
+
+			// Find optimal number of iterations
+			while((uHigh - uLow) >= 2UL)
+			{
+				ulong u = (uHigh + uLow) >> 1; // Binary search
+				// Interpolation search, if possible
+				if(bInterpSearch && (tLow > 0) && (tHigh > tTarget) &&
+					(tLow <= tTarget))
+				{
+					u = uLow + (((uHigh - uLow) * (ulong)(tTarget - tLow)) /
+						(ulong)(tHigh - tLow));
+					if((u >= uLow) && (u <= uHigh))
+					{
+						u = Math.Max(u, uLow + 1UL);
+						u = Math.Min(u, uHigh - 1UL);
+					}
+					else
+					{
+						Debug.Assert(false);
+						u = (uHigh + uLow) >> 1;
+					}
+				}
+
+				p.SetUInt64(strName, u);
+
+				// GC.Collect();
+				Stopwatch sw = Stopwatch.StartNew();
+				Transform(pbMsg, p);
+				sw.Stop();
+
+				long t = sw.ElapsedMilliseconds;
+				if(t == tTarget) { uLow = u; break; }
+				else if(t > tTarget) { uHigh = u; tHigh = t; }
+				else { uLow = u; tLow = t; }
+			}
+
+			p.SetUInt64(strName, uLow);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/KdfParameters.cs

@@ -0,0 +1,80 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2020 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+
+using KeePassLib.Collections;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+	public sealed class KdfParameters : VariantDictionary
+	{
+		private const string ParamUuid = @"$UUID";
+
+		private readonly PwUuid m_puKdf;
+		public PwUuid KdfUuid
+		{
+			get { return m_puKdf; }
+		}
+
+		public KdfParameters(PwUuid puKdf)
+		{
+			if(puKdf == null) throw new ArgumentNullException("puKdf");
+
+			m_puKdf = puKdf;
+			SetByteArray(ParamUuid, puKdf.UuidBytes);
+		}
+
+		/// <summary>
+		/// Unsupported.
+		/// </summary>
+		public override object Clone()
+		{
+			throw new NotSupportedException();
+		}
+
+		public static byte[] SerializeExt(KdfParameters p)
+		{
+			return VariantDictionary.Serialize(p);
+		}
+
+		public static KdfParameters DeserializeExt(byte[] pb)
+		{
+			VariantDictionary d = VariantDictionary.Deserialize(pb);
+			if(d == null) { Debug.Assert(false); return null; }
+
+			byte[] pbUuid = d.GetByteArray(ParamUuid);
+			if((pbUuid == null) || (pbUuid.Length != (int)PwUuid.UuidSize))
+			{
+				Debug.Assert(false);
+				return null;
+			}
+
+			PwUuid pu = new PwUuid(pbUuid);
+			KdfParameters p = new KdfParameters(pu);
+			d.CopyTo(p);
+			return p;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/KeyDerivation/KdfPool.cs

@@ -0,0 +1,97 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2020 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.KeyDerivation
+{
+	public static class KdfPool
+	{
+		private static List<KdfEngine> g_l = new List<KdfEngine>();
+
+		public static IEnumerable<KdfEngine> Engines
+		{
+			get
+			{
+				EnsureInitialized();
+				return g_l;
+			}
+		}
+
+		private static void EnsureInitialized()
+		{
+			if(g_l.Count != 0) return;
+
+			g_l.Add(new AesKdf());
+			g_l.Add(new Argon2Kdf(Argon2Type.D));
+			g_l.Add(new Argon2Kdf(Argon2Type.ID));
+		}
+
+		internal static KdfParameters GetDefaultParameters()
+		{
+			EnsureInitialized();
+			return g_l[0].GetDefaultParameters();
+		}
+
+		public static KdfEngine Get(PwUuid pu)
+		{
+			if(pu == null) { Debug.Assert(false); return null; }
+
+			EnsureInitialized();
+
+			foreach(KdfEngine kdf in g_l)
+			{
+				if(pu.Equals(kdf.Uuid)) return kdf;
+			}
+
+			return null;
+		}
+
+		public static KdfEngine Get(string strName)
+		{
+			if(string.IsNullOrEmpty(strName)) { Debug.Assert(false); return null; }
+
+			EnsureInitialized();
+
+			foreach(KdfEngine kdf in g_l)
+			{
+				if(strName.Equals(kdf.Name, StrUtil.CaseIgnoreCmp)) return kdf;
+			}
+
+			return null;
+		}
+
+		public static void Add(KdfEngine kdf)
+		{
+			if(kdf == null) { Debug.Assert(false); return; }
+
+			EnsureInitialized();
+
+			if(Get(kdf.Uuid) != null) { Debug.Assert(false); return; }
+			if(Get(kdf.Name) != null) { Debug.Assert(false); return; }
+
+			g_l.Add(kdf);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/CharSetBasedGenerator.cs

@@ -0,0 +1,65 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	internal static class CharSetBasedGenerator
+	{
+		internal static PwgError Generate(out ProtectedString psOut,
+			PwProfile pwProfile, CryptoRandomStream crsRandomSource)
+		{
+			psOut = ProtectedString.Empty;
+			if(pwProfile.Length == 0) return PwgError.Success;
+
+			PwCharSet pcs = new PwCharSet(pwProfile.CharSet.ToString());
+			char[] vGenerated = new char[pwProfile.Length];
+
+			PwGenerator.PrepareCharSet(pcs, pwProfile);
+
+			for(int nIndex = 0; nIndex < (int)pwProfile.Length; ++nIndex)
+			{
+				char ch = PwGenerator.GenerateCharacter(pwProfile, pcs,
+					crsRandomSource);
+
+				if(ch == char.MinValue)
+				{
+					MemUtil.ZeroArray<char>(vGenerated);
+					return PwgError.TooFewCharacters;
+				}
+
+				vGenerated[nIndex] = ch;
+			}
+
+			byte[] pbUtf8 = StrUtil.Utf8.GetBytes(vGenerated);
+			psOut = new ProtectedString(true, pbUtf8);
+			MemUtil.ZeroByteArray(pbUtf8);
+			MemUtil.ZeroArray<char>(vGenerated);
+
+			return PwgError.Success;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/CustomPwGenerator.cs

@@ -0,0 +1,66 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using KeePassLib;
+using KeePassLib.Security;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	public abstract class CustomPwGenerator
+	{
+		/// <summary>
+		/// Each custom password generation algorithm must have
+		/// its own unique UUID.
+		/// </summary>
+		public abstract PwUuid Uuid { get; }
+
+		/// <summary>
+		/// Displayable name of the password generation algorithm.
+		/// </summary>
+		public abstract string Name { get; }
+
+		public virtual bool SupportsOptions
+		{
+			get { return false; }
+		}
+
+		/// <summary>
+		/// Password generation function.
+		/// </summary>
+		/// <param name="prf">Password generation options chosen
+		/// by the user. This may be <c>null</c>, if the default
+		/// options should be used.</param>
+		/// <param name="crsRandomSource">Source that the algorithm
+		/// can use to generate random numbers.</param>
+		/// <returns>Generated password or <c>null</c> in case
+		/// of failure. If returning <c>null</c>, the caller assumes
+		/// that an error message has already been shown to the user.</returns>
+		public abstract ProtectedString Generate(PwProfile prf,
+			CryptoRandomStream crsRandomSource);
+
+		public virtual string GetOptions(string strCurrentOptions)
+		{
+			return string.Empty;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/CustomPwGeneratorPool.cs

@@ -0,0 +1,110 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	public sealed class CustomPwGeneratorPool : IEnumerable<CustomPwGenerator>
+	{
+		private List<CustomPwGenerator> m_vGens = new List<CustomPwGenerator>();
+
+		public int Count
+		{
+			get { return m_vGens.Count; }
+		}
+
+		public CustomPwGeneratorPool()
+		{
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vGens.GetEnumerator();
+		}
+
+		public IEnumerator<CustomPwGenerator> GetEnumerator()
+		{
+			return m_vGens.GetEnumerator();
+		}
+
+		public void Add(CustomPwGenerator pwg)
+		{
+			if(pwg == null) throw new ArgumentNullException("pwg");
+
+			PwUuid uuid = pwg.Uuid;
+			if(uuid == null) throw new ArgumentException();
+
+			int nIndex = FindIndex(uuid);
+
+			if(nIndex >= 0) m_vGens[nIndex] = pwg; // Replace
+			else m_vGens.Add(pwg);
+		}
+
+		public CustomPwGenerator Find(PwUuid uuid)
+		{
+			if(uuid == null) throw new ArgumentNullException("uuid");
+
+			foreach(CustomPwGenerator pwg in m_vGens)
+			{
+				if(uuid.Equals(pwg.Uuid)) return pwg;
+			}
+
+			return null;
+		}
+
+		public CustomPwGenerator Find(string strName)
+		{
+			if(strName == null) throw new ArgumentNullException("strName");
+
+			foreach(CustomPwGenerator pwg in m_vGens)
+			{
+				if(pwg.Name == strName) return pwg;
+			}
+
+			return null;
+		}
+
+		private int FindIndex(PwUuid uuid)
+		{
+			if(uuid == null) throw new ArgumentNullException("uuid");
+
+			for(int i = 0; i < m_vGens.Count; ++i)
+			{
+				if(uuid.Equals(m_vGens[i].Uuid)) return i;
+			}
+
+			return -1;
+		}
+
+		public bool Remove(PwUuid uuid)
+		{
+			if(uuid == null) throw new ArgumentNullException("uuid");
+
+			int nIndex = FindIndex(uuid);
+			if(nIndex < 0) return false;
+
+			m_vGens.RemoveAt(nIndex);
+			return true;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/PatternBasedGenerator.cs

@@ -0,0 +1,173 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	internal static class PatternBasedGenerator
+	{
+		internal static PwgError Generate(out ProtectedString psOut,
+			PwProfile pwProfile, CryptoRandomStream crsRandomSource)
+		{
+			psOut = ProtectedString.Empty;
+			LinkedList<char> vGenerated = new LinkedList<char>();
+			PwCharSet pcsCurrent = new PwCharSet();
+			PwCharSet pcsCustom = new PwCharSet();
+			PwCharSet pcsUsed = new PwCharSet();
+			bool bInCharSetDef = false;
+
+			string strPattern = ExpandPattern(pwProfile.Pattern);
+			if(strPattern.Length == 0) return PwgError.Success;
+
+			CharStream csStream = new CharStream(strPattern);
+			char ch = csStream.ReadChar();
+
+			while(ch != char.MinValue)
+			{
+				pcsCurrent.Clear();
+
+				bool bGenerateChar = false;
+
+				if(ch == '\\')
+				{
+					ch = csStream.ReadChar();
+					if(ch == char.MinValue) // Backslash at the end
+					{
+						vGenerated.AddLast('\\');
+						break;
+					}
+
+					if(bInCharSetDef) pcsCustom.Add(ch);
+					else
+					{
+						vGenerated.AddLast(ch);
+						pcsUsed.Add(ch);
+					}
+				}
+				else if(ch == '[')
+				{
+					pcsCustom.Clear();
+					bInCharSetDef = true;
+				}
+				else if(ch == ']')
+				{
+					pcsCurrent.Add(pcsCustom.ToString());
+
+					bInCharSetDef = false;
+					bGenerateChar = true;
+				}
+				else if(bInCharSetDef)
+				{
+					if(pcsCustom.AddCharSet(ch) == false)
+						pcsCustom.Add(ch);
+				}
+				else if(pcsCurrent.AddCharSet(ch) == false)
+				{
+					vGenerated.AddLast(ch);
+					pcsUsed.Add(ch);
+				}
+				else bGenerateChar = true;
+
+				if(bGenerateChar)
+				{
+					PwGenerator.PrepareCharSet(pcsCurrent, pwProfile);
+
+					if(pwProfile.NoRepeatingCharacters)
+						pcsCurrent.Remove(pcsUsed.ToString());
+
+					char chGen = PwGenerator.GenerateCharacter(pwProfile,
+						pcsCurrent, crsRandomSource);
+
+					if(chGen == char.MinValue) return PwgError.TooFewCharacters;
+
+					vGenerated.AddLast(chGen);
+					pcsUsed.Add(chGen);
+				}
+
+				ch = csStream.ReadChar();
+			}
+
+			if(vGenerated.Count == 0) return PwgError.Success;
+
+			char[] vArray = new char[vGenerated.Count];
+			vGenerated.CopyTo(vArray, 0);
+
+			if(pwProfile.PatternPermutePassword)
+				PwGenerator.ShufflePassword(vArray, crsRandomSource);
+
+			byte[] pbUtf8 = StrUtil.Utf8.GetBytes(vArray);
+			psOut = new ProtectedString(true, pbUtf8);
+			MemUtil.ZeroByteArray(pbUtf8);
+			MemUtil.ZeroArray<char>(vArray);
+			vGenerated.Clear();
+
+			return PwgError.Success;
+		}
+
+		private static string ExpandPattern(string strPattern)
+		{
+			Debug.Assert(strPattern != null); if(strPattern == null) return string.Empty;
+			string str = strPattern;
+
+			while(true)
+			{
+				int nOpen = FindFirstUnescapedChar(str, '{');
+				int nClose = FindFirstUnescapedChar(str, '}');
+
+				if((nOpen >= 0) && (nOpen < nClose))
+				{
+					string strCount = str.Substring(nOpen + 1, nClose - nOpen - 1);
+					str = str.Remove(nOpen, nClose - nOpen + 1);
+
+					uint uRepeat;
+					if(StrUtil.TryParseUInt(strCount, out uRepeat) && (nOpen >= 1))
+					{
+						if(uRepeat == 0)
+							str = str.Remove(nOpen - 1, 1);
+						else
+							str = str.Insert(nOpen, new string(str[nOpen - 1], (int)uRepeat - 1));
+					}
+				}
+				else break;
+			}
+
+			return str;
+		}
+
+		private static int FindFirstUnescapedChar(string str, char ch)
+		{
+			for(int i = 0; i < str.Length; ++i)
+			{
+				char chCur = str[i];
+
+				if(chCur == '\\') ++i; // Next is escaped, skip it
+				else if(chCur == ch) return i;
+			}
+
+			return -1;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/PwCharSet.cs

@@ -0,0 +1,351 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	public sealed class PwCharSet
+	{
+		public const string UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+		public const string LowerCase = "abcdefghijklmnopqrstuvwxyz";
+		public const string Digits = "0123456789";
+
+		public const string UpperConsonants = "BCDFGHJKLMNPQRSTVWXYZ";
+		public const string LowerConsonants = "bcdfghjklmnpqrstvwxyz";
+		public const string UpperVowels = "AEIOU";
+		public const string LowerVowels = "aeiou";
+
+		public const string Punctuation = @",.;:";
+		public const string Brackets = @"[]{}()<>";
+
+		public const string PrintableAsciiSpecial = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
+
+		public const string UpperHex = "0123456789ABCDEF";
+		public const string LowerHex = "0123456789abcdef";
+
+		public const string Invalid = "\t\r\n";
+		public const string LookAlike = @"O0l1I|";
+
+		internal const string MenuAccels = PwCharSet.LowerCase + PwCharSet.Digits;
+
+		private const int CharTabSize = (0x10000 / 8);
+
+		private List<char> m_vChars = new List<char>();
+		private byte[] m_vTab = new byte[CharTabSize];
+
+		private static string m_strHighAnsi = null;
+		public static string HighAnsiChars
+		{
+			get
+			{
+				if(m_strHighAnsi == null) { new PwCharSet(); } // Create string
+				Debug.Assert(m_strHighAnsi != null);
+				return m_strHighAnsi;
+			}
+		}
+
+		private static string m_strSpecial = null;
+		public static string SpecialChars
+		{
+			get
+			{
+				if(m_strSpecial == null) { new PwCharSet(); } // Create string
+				Debug.Assert(m_strSpecial != null);
+				return m_strSpecial;
+			}
+		}
+
+		/// <summary>
+		/// Create a new, empty character set collection object.
+		/// </summary>
+		public PwCharSet()
+		{
+			Initialize(true);
+		}
+
+		public PwCharSet(string strCharSet)
+		{
+			Initialize(true);
+			Add(strCharSet);
+		}
+
+		private PwCharSet(bool bFullInitialize)
+		{
+			Initialize(bFullInitialize);
+		}
+
+		private void Initialize(bool bFullInitialize)
+		{
+			Clear();
+
+			if(!bFullInitialize) return;
+
+			if(m_strHighAnsi == null)
+			{
+				StringBuilder sbHighAnsi = new StringBuilder();
+				// [U+0080, U+009F] are C1 control characters,
+				// U+00A0 is non-breaking space
+				for(char ch = '\u00A1'; ch <= '\u00AC'; ++ch)
+					sbHighAnsi.Append(ch);
+				// U+00AD is soft hyphen (format character)
+				for(char ch = '\u00AE'; ch < '\u00FF'; ++ch)
+					sbHighAnsi.Append(ch);
+				sbHighAnsi.Append('\u00FF');
+
+				m_strHighAnsi = sbHighAnsi.ToString();
+			}
+
+			if(m_strSpecial == null)
+			{
+				PwCharSet pcs = new PwCharSet(false);
+				pcs.AddRange('!', '/');
+				pcs.AddRange(':', '@');
+				pcs.AddRange('[', '`');
+				pcs.Add(@"|~");
+				pcs.Remove(@"-_ ");
+				pcs.Remove(PwCharSet.Brackets);
+
+				m_strSpecial = pcs.ToString();
+			}
+		}
+
+		/// <summary>
+		/// Number of characters in this set.
+		/// </summary>
+		public uint Size
+		{
+			get { return (uint)m_vChars.Count; }
+		}
+
+		/// <summary>
+		/// Get a character of the set using an index.
+		/// </summary>
+		/// <param name="uPos">Index of the character to get.</param>
+		/// <returns>Character at the specified position. If the index is invalid,
+		/// an <c>ArgumentOutOfRangeException</c> is thrown.</returns>
+		public char this[uint uPos]
+		{
+			get
+			{
+				if(uPos >= (uint)m_vChars.Count)
+					throw new ArgumentOutOfRangeException("uPos");
+
+				return m_vChars[(int)uPos];
+			}
+		}
+
+		/// <summary>
+		/// Remove all characters from this set.
+		/// </summary>
+		public void Clear()
+		{
+			m_vChars.Clear();
+			Array.Clear(m_vTab, 0, m_vTab.Length);
+		}
+
+		public bool Contains(char ch)
+		{
+			return (((m_vTab[ch / 8] >> (ch % 8)) & 1) != char.MinValue);
+		}
+
+		public bool Contains(string strCharacters)
+		{
+			Debug.Assert(strCharacters != null);
+			if(strCharacters == null) throw new ArgumentNullException("strCharacters");
+
+			foreach(char ch in strCharacters)
+			{
+				if(!Contains(ch)) return false;
+			}
+
+			return true;
+		}
+
+		/// <summary>
+		/// Add characters to the set.
+		/// </summary>
+		/// <param name="ch">Character to add.</param>
+		public void Add(char ch)
+		{
+			if(ch == char.MinValue) { Debug.Assert(false); return; }
+
+			if(!Contains(ch))
+			{
+				m_vChars.Add(ch);
+				m_vTab[ch / 8] |= (byte)(1 << (ch % 8));
+			}
+		}
+
+		/// <summary>
+		/// Add characters to the set.
+		/// </summary>
+		/// <param name="strCharSet">String containing characters to add.</param>
+		public void Add(string strCharSet)
+		{
+			Debug.Assert(strCharSet != null);
+			if(strCharSet == null) throw new ArgumentNullException("strCharSet");
+
+			m_vChars.Capacity = m_vChars.Count + strCharSet.Length;
+
+			foreach(char ch in strCharSet)
+				Add(ch);
+		}
+
+		public void Add(string strCharSet1, string strCharSet2)
+		{
+			Add(strCharSet1);
+			Add(strCharSet2);
+		}
+
+		public void Add(string strCharSet1, string strCharSet2, string strCharSet3)
+		{
+			Add(strCharSet1);
+			Add(strCharSet2);
+			Add(strCharSet3);
+		}
+
+		public void AddRange(char chMin, char chMax)
+		{
+			m_vChars.Capacity = m_vChars.Count + (chMax - chMin) + 1;
+
+			for(char ch = chMin; ch < chMax; ++ch)
+				Add(ch);
+
+			Add(chMax);
+		}
+
+		public bool AddCharSet(char chCharSetIdentifier)
+		{
+			bool bResult = true;
+
+			switch(chCharSetIdentifier)
+			{
+				case 'a': Add(PwCharSet.LowerCase, PwCharSet.Digits); break;
+				case 'A': Add(PwCharSet.LowerCase, PwCharSet.UpperCase,
+					PwCharSet.Digits); break;
+				case 'U': Add(PwCharSet.UpperCase, PwCharSet.Digits); break;
+				case 'c': Add(PwCharSet.LowerConsonants); break;
+				case 'C': Add(PwCharSet.LowerConsonants,
+					PwCharSet.UpperConsonants); break;
+				case 'z': Add(PwCharSet.UpperConsonants); break;
+				case 'd': Add(PwCharSet.Digits); break; // Digit
+				case 'h': Add(PwCharSet.LowerHex); break;
+				case 'H': Add(PwCharSet.UpperHex); break;
+				case 'l': Add(PwCharSet.LowerCase); break;
+				case 'L': Add(PwCharSet.LowerCase, PwCharSet.UpperCase); break;
+				case 'u': Add(PwCharSet.UpperCase); break;
+				case 'p': Add(PwCharSet.Punctuation); break;
+				case 'b': Add(PwCharSet.Brackets); break;
+				case 's': Add(PwCharSet.PrintableAsciiSpecial); break;
+				case 'S': Add(PwCharSet.UpperCase, PwCharSet.LowerCase);
+					Add(PwCharSet.Digits, PwCharSet.PrintableAsciiSpecial); break;
+				case 'v': Add(PwCharSet.LowerVowels); break;
+				case 'V': Add(PwCharSet.LowerVowels, PwCharSet.UpperVowels); break;
+				case 'Z': Add(PwCharSet.UpperVowels); break;
+				case 'x': Add(m_strHighAnsi); break;
+				default: bResult = false; break;
+			}
+
+			return bResult;
+		}
+
+		public bool Remove(char ch)
+		{
+			m_vTab[ch / 8] &= (byte)(~(1 << (ch % 8)));
+			return m_vChars.Remove(ch);
+		}
+
+		public bool Remove(string strCharacters)
+		{
+			Debug.Assert(strCharacters != null);
+			if(strCharacters == null) throw new ArgumentNullException("strCharacters");
+
+			bool bResult = true;
+			foreach(char ch in strCharacters)
+			{
+				if(!Remove(ch)) bResult = false;
+			}
+
+			return bResult;
+		}
+
+		public bool RemoveIfAllExist(string strCharacters)
+		{
+			Debug.Assert(strCharacters != null);
+			if(strCharacters == null) throw new ArgumentNullException("strCharacters");
+
+			if(!Contains(strCharacters))
+				return false;
+
+			return Remove(strCharacters);
+		}
+
+		/// <summary>
+		/// Convert the character set to a string containing all its characters.
+		/// </summary>
+		/// <returns>String containing all character set characters.</returns>
+		public override string ToString()
+		{
+			StringBuilder sb = new StringBuilder();
+			foreach(char ch in m_vChars)
+				sb.Append(ch);
+
+			return sb.ToString();
+		}
+
+		public string PackAndRemoveCharRanges()
+		{
+			StringBuilder sb = new StringBuilder();
+
+			sb.Append(RemoveIfAllExist(PwCharSet.UpperCase) ? 'U' : '_');
+			sb.Append(RemoveIfAllExist(PwCharSet.LowerCase) ? 'L' : '_');
+			sb.Append(RemoveIfAllExist(PwCharSet.Digits) ? 'D' : '_');
+			sb.Append(RemoveIfAllExist(m_strSpecial) ? 'S' : '_');
+			sb.Append(RemoveIfAllExist(PwCharSet.Punctuation) ? 'P' : '_');
+			sb.Append(RemoveIfAllExist(@"-") ? 'm' : '_');
+			sb.Append(RemoveIfAllExist(@"_") ? 'u' : '_');
+			sb.Append(RemoveIfAllExist(@" ") ? 's' : '_');
+			sb.Append(RemoveIfAllExist(PwCharSet.Brackets) ? 'B' : '_');
+			sb.Append(RemoveIfAllExist(m_strHighAnsi) ? 'H' : '_');
+
+			return sb.ToString();
+		}
+
+		public void UnpackCharRanges(string strRanges)
+		{
+			if(strRanges == null) { Debug.Assert(false); return; }
+			if(strRanges.Length < 10) { Debug.Assert(false); return; }
+
+			if(strRanges[0] != '_') Add(PwCharSet.UpperCase);
+			if(strRanges[1] != '_') Add(PwCharSet.LowerCase);
+			if(strRanges[2] != '_') Add(PwCharSet.Digits);
+			if(strRanges[3] != '_') Add(m_strSpecial);
+			if(strRanges[4] != '_') Add(PwCharSet.Punctuation);
+			if(strRanges[5] != '_') Add('-');
+			if(strRanges[6] != '_') Add('_');
+			if(strRanges[7] != '_') Add(' ');
+			if(strRanges[8] != '_') Add(PwCharSet.Brackets);
+			if(strRanges[9] != '_') Add(m_strHighAnsi);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/PwGenerator.cs

@@ -0,0 +1,152 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2016 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Security.Cryptography;
+using System.Text;
+
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	public enum PwgError
+	{
+		Success = 0,
+		Unknown = 1,
+		TooFewCharacters = 2,
+		UnknownAlgorithm = 3
+	}
+
+	/// <summary>
+	/// Utility functions for generating random passwords.
+	/// </summary>
+	public static class PwGenerator
+	{
+		public static PwgError Generate(out ProtectedString psOut,
+			PwProfile pwProfile, byte[] pbUserEntropy,
+			CustomPwGeneratorPool pwAlgorithmPool)
+		{
+			Debug.Assert(pwProfile != null);
+			if (pwProfile == null) throw new ArgumentNullException("pwProfile");
+
+			CryptoRandomStream crs = CreateCryptoStream(pbUserEntropy);
+			PwgError e = PwgError.Unknown;
+
+			if (pwProfile.GeneratorType == PasswordGeneratorType.CharSet)
+				e = CharSetBasedGenerator.Generate(out psOut, pwProfile, crs);
+			else if (pwProfile.GeneratorType == PasswordGeneratorType.Pattern)
+				e = PatternBasedGenerator.Generate(out psOut, pwProfile, crs);
+			else if (pwProfile.GeneratorType == PasswordGeneratorType.Custom)
+				e = GenerateCustom(out psOut, pwProfile, crs, pwAlgorithmPool);
+			else { Debug.Assert(false); psOut = ProtectedString.Empty; }
+
+			return e;
+		}
+
+		private static CryptoRandomStream CreateCryptoStream(byte[] pbAdditionalEntropy)
+		{
+			byte[] pbKey = CryptoRandom.Instance.GetRandomBytes(128);
+
+			// Mix in additional entropy
+			Debug.Assert(pbKey.Length >= 64);
+			if ((pbAdditionalEntropy != null) && (pbAdditionalEntropy.Length > 0))
+			{
+				using (SHA512Managed h = new SHA512Managed())
+				{
+					byte[] pbHash = h.ComputeHash(pbAdditionalEntropy);
+					MemUtil.XorArray(pbHash, 0, pbKey, 0, pbHash.Length);
+				}
+			}
+
+			return new CryptoRandomStream(CrsAlgorithm.ChaCha20, pbKey);
+		}
+
+		internal static char GenerateCharacter(PwProfile pwProfile,
+			PwCharSet pwCharSet, CryptoRandomStream crsRandomSource)
+		{
+			if (pwCharSet.Size == 0) return char.MinValue;
+
+			ulong uIndex = crsRandomSource.GetRandomUInt64();
+			uIndex %= (ulong)pwCharSet.Size;
+
+			char ch = pwCharSet[(uint)uIndex];
+
+			if (pwProfile.NoRepeatingCharacters)
+				pwCharSet.Remove(ch);
+
+			return ch;
+		}
+
+		internal static void PrepareCharSet(PwCharSet pwCharSet, PwProfile pwProfile)
+		{
+			pwCharSet.Remove(PwCharSet.Invalid);
+
+			if (pwProfile.ExcludeLookAlike) pwCharSet.Remove(PwCharSet.LookAlike);
+
+			if (pwProfile.ExcludeCharacters.Length > 0)
+				pwCharSet.Remove(pwProfile.ExcludeCharacters);
+		}
+
+		internal static void ShufflePassword(char[] pPassword,
+			CryptoRandomStream crsRandomSource)
+		{
+			Debug.Assert(pPassword != null); if (pPassword == null) return;
+			Debug.Assert(crsRandomSource != null); if (crsRandomSource == null) return;
+
+			if (pPassword.Length <= 1) return; // Nothing to shuffle
+
+			for (int nSelect = 0; nSelect < pPassword.Length; ++nSelect)
+			{
+				ulong uRandomIndex = crsRandomSource.GetRandomUInt64();
+				uRandomIndex %= (ulong)(pPassword.Length - nSelect);
+
+				char chTemp = pPassword[nSelect];
+				pPassword[nSelect] = pPassword[nSelect + (int)uRandomIndex];
+				pPassword[nSelect + (int)uRandomIndex] = chTemp;
+			}
+		}
+
+		private static PwgError GenerateCustom(out ProtectedString psOut,
+			PwProfile pwProfile, CryptoRandomStream crs,
+			CustomPwGeneratorPool pwAlgorithmPool)
+		{
+			psOut = ProtectedString.Empty;
+
+			Debug.Assert(pwProfile.GeneratorType == PasswordGeneratorType.Custom);
+			if (pwAlgorithmPool == null) return PwgError.UnknownAlgorithm;
+
+			string strID = pwProfile.CustomAlgorithmUuid;
+			if (string.IsNullOrEmpty(strID)) { Debug.Assert(false); return PwgError.UnknownAlgorithm; }
+
+			byte[] pbUuid = Convert.FromBase64String(strID);
+			PwUuid uuid = new PwUuid(pbUuid);
+			CustomPwGenerator pwg = pwAlgorithmPool.Find(uuid);
+			if (pwg == null) { Debug.Assert(false); return PwgError.UnknownAlgorithm; }
+
+			ProtectedString pwd = pwg.Generate(pwProfile.CloneDeep(), crs);
+			if (pwd == null) return PwgError.Unknown;
+
+			psOut = pwd;
+			return PwgError.Success;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PasswordGenerator/PwProfile.cs

@@ -0,0 +1,278 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Xml.Serialization;
+using System.ComponentModel;
+using System.Diagnostics;
+
+using KeePassLib.Interfaces;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography.PasswordGenerator
+{
+	/// <summary>
+	/// Type of the password generator. Different types like generators
+	/// based on given patterns, based on character sets, etc. are
+	/// available.
+	/// </summary>
+	public enum PasswordGeneratorType
+	{
+		/// <summary>
+		/// Generator based on character spaces/sets, i.e. groups
+		/// of characters like lower-case, upper-case or numeric characters.
+		/// </summary>
+		CharSet = 0,
+
+		/// <summary>
+		/// Password generation based on a pattern. The user has provided
+		/// a pattern, which describes how the generated password has to
+		/// look like.
+		/// </summary>
+		Pattern = 1,
+
+		Custom = 2
+	}
+
+	public sealed class PwProfile : IDeepCloneable<PwProfile>
+	{
+		private string m_strName = string.Empty;
+		[DefaultValue("")]
+		public string Name
+		{
+			get { return m_strName; }
+			set { m_strName = value; }
+		}
+
+		private PasswordGeneratorType m_type = PasswordGeneratorType.CharSet;
+		public PasswordGeneratorType GeneratorType
+		{
+			get { return m_type; }
+			set { m_type = value; }
+		}
+
+		private bool m_bUserEntropy = false;
+		[DefaultValue(false)]
+		public bool CollectUserEntropy
+		{
+			get { return m_bUserEntropy; }
+			set { m_bUserEntropy = value; }
+		}
+
+		private uint m_uLength = 20;
+		public uint Length
+		{
+			get { return m_uLength; }
+			set { m_uLength = value; }
+		}
+
+		private PwCharSet m_pwCharSet = new PwCharSet(PwCharSet.UpperCase +
+			PwCharSet.LowerCase + PwCharSet.Digits);
+		[XmlIgnore]
+		public PwCharSet CharSet
+		{
+			get { return m_pwCharSet; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_pwCharSet = value;
+			}
+		}
+
+		private string m_strCharSetRanges = string.Empty;
+		[DefaultValue("")]
+		public string CharSetRanges
+		{
+			get { this.UpdateCharSet(true); return m_strCharSetRanges; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strCharSetRanges = value;
+				this.UpdateCharSet(false);
+			}
+		}
+
+		private string m_strCharSetAdditional = string.Empty;
+		[DefaultValue("")]
+		public string CharSetAdditional
+		{
+			get { this.UpdateCharSet(true); return m_strCharSetAdditional; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strCharSetAdditional = value;
+				this.UpdateCharSet(false);
+			}
+		}
+
+		private string m_strPattern = string.Empty;
+		[DefaultValue("")]
+		public string Pattern
+		{
+			get { return m_strPattern; }
+			set { m_strPattern = value; }
+		}
+
+		private bool m_bPatternPermute = false;
+		[DefaultValue(false)]
+		public bool PatternPermutePassword
+		{
+			get { return m_bPatternPermute; }
+			set { m_bPatternPermute = value; }
+		}
+
+		private bool m_bNoLookAlike = false;
+		[DefaultValue(false)]
+		public bool ExcludeLookAlike
+		{
+			get { return m_bNoLookAlike; }
+			set { m_bNoLookAlike = value; }
+		}
+
+		private bool m_bNoRepeat = false;
+		[DefaultValue(false)]
+		public bool NoRepeatingCharacters
+		{
+			get { return m_bNoRepeat; }
+			set { m_bNoRepeat = value; }
+		}
+
+		private string m_strExclude = string.Empty;
+		[DefaultValue("")]
+		public string ExcludeCharacters
+		{
+			get { return m_strExclude; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strExclude = value;
+			}
+		}
+
+		private string m_strCustomID = string.Empty;
+		[DefaultValue("")]
+		public string CustomAlgorithmUuid
+		{
+			get { return m_strCustomID; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strCustomID = value;
+			}
+		}
+
+		private string m_strCustomOpt = string.Empty;
+		[DefaultValue("")]
+		public string CustomAlgorithmOptions
+		{
+			get { return m_strCustomOpt; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strCustomOpt = value;
+			}
+		}
+
+		public PwProfile()
+		{
+		}
+
+		public PwProfile CloneDeep()
+		{
+			PwProfile p = new PwProfile();
+
+			p.m_strName = m_strName;
+			p.m_type = m_type;
+			p.m_bUserEntropy = m_bUserEntropy;
+			p.m_uLength = m_uLength;
+			p.m_pwCharSet = new PwCharSet(m_pwCharSet.ToString());
+			p.m_strCharSetRanges = m_strCharSetRanges;
+			p.m_strCharSetAdditional = m_strCharSetAdditional;
+			p.m_strPattern = m_strPattern;
+			p.m_bPatternPermute = m_bPatternPermute;
+			p.m_bNoLookAlike = m_bNoLookAlike;
+			p.m_bNoRepeat = m_bNoRepeat;
+			p.m_strExclude = m_strExclude;
+			p.m_strCustomID = m_strCustomID;
+			p.m_strCustomOpt = m_strCustomOpt;
+
+			return p;
+		}
+
+		private void UpdateCharSet(bool bSetXml)
+		{
+			if(bSetXml)
+			{
+				PwCharSet pcs = new PwCharSet(m_pwCharSet.ToString());
+				m_strCharSetRanges = pcs.PackAndRemoveCharRanges();
+				m_strCharSetAdditional = pcs.ToString();
+			}
+			else
+			{
+				PwCharSet pcs = new PwCharSet(m_strCharSetAdditional);
+				pcs.UnpackCharRanges(m_strCharSetRanges);
+				m_pwCharSet = pcs;
+			}
+		}
+
+		public static PwProfile DeriveFromPassword(ProtectedString psPassword)
+		{
+			PwProfile pp = new PwProfile();
+			Debug.Assert(psPassword != null); if(psPassword == null) return pp;
+
+			byte[] pbUtf8 = psPassword.ReadUtf8();
+			char[] vChars = StrUtil.Utf8.GetChars(pbUtf8);
+
+			pp.GeneratorType = PasswordGeneratorType.CharSet;
+			pp.Length = (uint)vChars.Length;
+
+			PwCharSet pcs = pp.CharSet;
+			pcs.Clear();
+
+			foreach(char ch in vChars)
+			{
+				if((ch >= 'A') && (ch <= 'Z')) pcs.Add(PwCharSet.UpperCase);
+				else if((ch >= 'a') && (ch <= 'z')) pcs.Add(PwCharSet.LowerCase);
+				else if((ch >= '0') && (ch <= '9')) pcs.Add(PwCharSet.Digits);
+				else if(PwCharSet.SpecialChars.IndexOf(ch) >= 0)
+					pcs.Add(PwCharSet.SpecialChars);
+				else if(ch == ' ') pcs.Add(' ');
+				else if(ch == '-') pcs.Add('-');
+				else if(ch == '_') pcs.Add('_');
+				else if(PwCharSet.Brackets.IndexOf(ch) >= 0)
+					pcs.Add(PwCharSet.Brackets);
+				else if(PwCharSet.HighAnsiChars.IndexOf(ch) >= 0)
+					pcs.Add(PwCharSet.HighAnsiChars);
+				else pcs.Add(ch);
+			}
+
+			MemUtil.ZeroArray<char>(vChars);
+			MemUtil.ZeroByteArray(pbUtf8);
+			return pp;
+		}
+
+		public bool HasSecurityReducingOption()
+		{
+			return (m_bNoLookAlike || m_bNoRepeat || (m_strExclude.Length > 0));
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/PopularPasswords.cs

@@ -0,0 +1,134 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	public static class PopularPasswords
+	{
+		private static Dictionary<int, Dictionary<string, bool>> m_dicts =
+			new Dictionary<int, Dictionary<string, bool>>();
+
+		internal static int MaxLength
+		{
+			get
+			{
+				Debug.Assert(m_dicts.Count > 0); // Should be initialized
+
+				int iMaxLen = 0;
+				foreach(int iLen in m_dicts.Keys)
+				{
+					if(iLen > iMaxLen) iMaxLen = iLen;
+				}
+
+				return iMaxLen;
+			}
+		}
+
+		internal static bool ContainsLength(int nLength)
+		{
+			Dictionary<string, bool> dDummy;
+			return m_dicts.TryGetValue(nLength, out dDummy);
+		}
+
+		public static bool IsPopularPassword(char[] vPassword)
+		{
+			ulong uDummy;
+			return IsPopularPassword(vPassword, out uDummy);
+		}
+
+		public static bool IsPopularPassword(char[] vPassword, out ulong uDictSize)
+		{
+			if(vPassword == null) throw new ArgumentNullException("vPassword");
+			if(vPassword.Length == 0) { uDictSize = 0; return false; }
+
+			string str = new string(vPassword);
+
+			try { return IsPopularPasswordPriv(str, out uDictSize); }
+			catch(Exception) { Debug.Assert(false); }
+
+			uDictSize = 0;
+			return false;
+		}
+
+		private static bool IsPopularPasswordPriv(string str, out ulong uDictSize)
+		{
+			Debug.Assert(m_dicts.Count > 0); // Should be initialized with data
+
+			Dictionary<string, bool> d;
+			if(!m_dicts.TryGetValue(str.Length, out d))
+			{
+				uDictSize = 0;
+				return false;
+			}
+
+			uDictSize = (ulong)d.Count;
+			return d.ContainsKey(str);
+		}
+
+		public static void Add(byte[] pbData, bool bGZipped)
+		{
+			try
+			{
+				if(bGZipped)
+					pbData = MemUtil.Decompress(pbData);
+
+				string strData = StrUtil.Utf8.GetString(pbData, 0, pbData.Length);
+				if(string.IsNullOrEmpty(strData)) { Debug.Assert(false); return; }
+
+				if(!char.IsWhiteSpace(strData[strData.Length - 1]))
+					strData += "\n";
+
+				StringBuilder sb = new StringBuilder();
+				for(int i = 0; i < strData.Length; ++i)
+				{
+					char ch = strData[i];
+
+					if(char.IsWhiteSpace(ch))
+					{
+						int cc = sb.Length;
+						if(cc > 0)
+						{
+							string strWord = sb.ToString();
+							Debug.Assert(strWord.Length == cc);
+
+							Dictionary<string, bool> d;
+							if(!m_dicts.TryGetValue(cc, out d))
+							{
+								d = new Dictionary<string, bool>();
+								m_dicts[cc] = d;
+							}
+
+							d[strWord] = true;
+							sb.Remove(0, cc);
+						}
+					}
+					else sb.Append(char.ToLower(ch));
+				}
+			}
+			catch(Exception) { Debug.Assert(false); }
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Cryptography/QualityEstimation.cs

@@ -0,0 +1,768 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Cryptography.PasswordGenerator;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Cryptography
+{
+	/// <summary>
+	/// A class that offers static functions to estimate the quality of
+	/// passwords.
+	/// </summary>
+	public static class QualityEstimation
+	{
+		private static class PatternID
+		{
+			public const char LowerAlpha = 'L';
+			public const char UpperAlpha = 'U';
+			public const char Digit = 'D';
+			public const char Special = 'S';
+			public const char High = 'H';
+			public const char Other = 'X';
+
+			public const char Dictionary = 'W';
+			public const char Repetition = 'R';
+			public const char Number = 'N';
+			public const char DiffSeq = 'C';
+
+			public const string All = "LUDSHXWRNC";
+		}
+
+		// private static class CharDistrib
+		// {
+		//	public static readonly ulong[] LowerAlpha = new ulong[26] {
+		//		884, 211, 262, 249, 722, 98, 172, 234, 556, 124, 201, 447, 321,
+		//		483, 518, 167, 18, 458, 416, 344, 231, 105, 80, 48, 238, 76
+		//	};
+		//	public static readonly ulong[] UpperAlpha = new ulong[26] {
+		//		605, 188, 209, 200, 460, 81, 130, 163, 357, 122, 144, 332, 260,
+		//		317, 330, 132, 18, 320, 315, 250, 137, 76, 60, 36, 161, 54
+		//	};
+		//	public static readonly ulong[] Digit = new ulong[10] {
+		//		574, 673, 524, 377, 339, 336, 312, 310, 357, 386
+		//	};
+		// }
+
+		private sealed class QeCharType
+		{
+			private readonly char m_chTypeID;
+			public char TypeID { get { return m_chTypeID; } }
+
+			private readonly string m_strAlph;
+			public string Alphabet { get { return m_strAlph; } }
+
+			private readonly int m_nChars;
+			public int CharCount { get { return m_nChars; } }
+
+			private readonly char m_chFirst;
+			private readonly char m_chLast;
+
+			private readonly double m_dblCharSize;
+			public double CharSize { get { return m_dblCharSize; } }
+
+			public QeCharType(char chTypeID, string strAlphabet, bool bIsConsecutive)
+			{
+				if(strAlphabet == null) throw new ArgumentNullException();
+				if(strAlphabet.Length == 0) throw new ArgumentException();
+
+				m_chTypeID = chTypeID;
+				m_strAlph = strAlphabet;
+				m_nChars = m_strAlph.Length;
+				m_chFirst = (bIsConsecutive ? m_strAlph[0] : char.MinValue);
+				m_chLast = (bIsConsecutive ? m_strAlph[m_nChars - 1] : char.MinValue);
+
+				m_dblCharSize = Log2(m_nChars);
+
+				Debug.Assert(((int)(m_chLast - m_chFirst) == (m_nChars - 1)) ||
+					!bIsConsecutive);
+			}
+
+			public QeCharType(char chTypeID, int nChars) // Catch-none set
+			{
+				if(nChars <= 0) throw new ArgumentOutOfRangeException();
+
+				m_chTypeID = chTypeID;
+				m_strAlph = string.Empty;
+				m_nChars = nChars;
+				m_chFirst = char.MinValue;
+				m_chLast = char.MinValue;
+
+				m_dblCharSize = Log2(m_nChars);
+			}
+
+			public bool Contains(char ch)
+			{
+				if(m_chLast != char.MinValue)
+					return ((ch >= m_chFirst) && (ch <= m_chLast));
+
+				Debug.Assert(m_strAlph.Length > 0); // Don't call for catch-none set
+				return (m_strAlph.IndexOf(ch) >= 0);
+			}
+		}
+
+		private sealed class EntropyEncoder
+		{
+			private readonly string m_strAlph;
+			private Dictionary<char, ulong> m_dHisto = new Dictionary<char, ulong>();
+			private readonly ulong m_uBaseWeight;
+			private readonly ulong m_uCharWeight;
+			private readonly ulong m_uOccExclThreshold;
+
+			public EntropyEncoder(string strAlphabet, ulong uBaseWeight,
+				ulong uCharWeight, ulong uOccExclThreshold)
+			{
+				if(strAlphabet == null) throw new ArgumentNullException();
+				if(strAlphabet.Length == 0) throw new ArgumentException();
+
+				m_strAlph = strAlphabet;
+				m_uBaseWeight = uBaseWeight;
+				m_uCharWeight = uCharWeight;
+				m_uOccExclThreshold = uOccExclThreshold;
+
+#if DEBUG
+				Dictionary<char, bool> d = new Dictionary<char, bool>();
+				foreach(char ch in m_strAlph) { d[ch] = true; }
+				Debug.Assert(d.Count == m_strAlph.Length); // No duplicates
+#endif
+			}
+
+			public void Reset()
+			{
+				m_dHisto.Clear();
+			}
+
+			public void Write(char ch)
+			{
+				Debug.Assert(m_strAlph.IndexOf(ch) >= 0);
+
+				ulong uOcc;
+				m_dHisto.TryGetValue(ch, out uOcc);
+				Debug.Assert(m_dHisto.ContainsKey(ch) || (uOcc == 0));
+				m_dHisto[ch] = uOcc + 1;
+			}
+
+			public double GetOutputSize()
+			{
+				ulong uTotalWeight = m_uBaseWeight * (ulong)m_strAlph.Length;
+				foreach(ulong u in m_dHisto.Values)
+				{
+					Debug.Assert(u >= 1);
+					if(u > m_uOccExclThreshold)
+						uTotalWeight += (u - m_uOccExclThreshold) * m_uCharWeight;
+				}
+
+				double dSize = 0.0, dTotalWeight = (double)uTotalWeight;
+				foreach(ulong u in m_dHisto.Values)
+				{
+					ulong uWeight = m_uBaseWeight;
+					if(u > m_uOccExclThreshold)
+						uWeight += (u - m_uOccExclThreshold) * m_uCharWeight;
+
+					dSize -= (double)u * Log2((double)uWeight / dTotalWeight);
+				}
+
+				return dSize;
+			}
+		}
+
+		private sealed class MultiEntropyEncoder
+		{
+			private Dictionary<char, EntropyEncoder> m_dEncs =
+				new Dictionary<char, EntropyEncoder>();
+
+			public MultiEntropyEncoder()
+			{
+			}
+
+			public void AddEncoder(char chTypeID, EntropyEncoder ec)
+			{
+				if(ec == null) { Debug.Assert(false); return; }
+
+				Debug.Assert(!m_dEncs.ContainsKey(chTypeID));
+				m_dEncs[chTypeID] = ec;
+			}
+
+			public void Reset()
+			{
+				foreach(EntropyEncoder ec in m_dEncs.Values) { ec.Reset(); }
+			}
+
+			public bool Write(char chTypeID, char chData)
+			{
+				EntropyEncoder ec;
+				if(!m_dEncs.TryGetValue(chTypeID, out ec))
+					return false;
+
+				ec.Write(chData);
+				return true;
+			}
+
+			public double GetOutputSize()
+			{
+				double d = 0.0;
+
+				foreach(EntropyEncoder ec in m_dEncs.Values)
+				{
+					d += ec.GetOutputSize();
+				}
+
+				return d;
+			}
+		}
+
+		private sealed class QePatternInstance
+		{
+			private readonly int m_iPos;
+			public int Position { get { return m_iPos; } }
+
+			private readonly int m_nLen;
+			public int Length { get { return m_nLen; } }
+
+			private readonly char m_chPatternID;
+			public char PatternID { get { return m_chPatternID; } }
+
+			private readonly double m_dblCost;
+			public double Cost { get { return m_dblCost; } }
+
+			private readonly QeCharType m_ctSingle;
+			public QeCharType SingleCharType { get { return m_ctSingle; } }
+
+			public QePatternInstance(int iPosition, int nLength, char chPatternID,
+				double dblCost)
+			{
+				m_iPos = iPosition;
+				m_nLen = nLength;
+				m_chPatternID = chPatternID;
+				m_dblCost = dblCost;
+				m_ctSingle = null;
+			}
+
+			public QePatternInstance(int iPosition, int nLength, QeCharType ctSingle)
+			{
+				m_iPos = iPosition;
+				m_nLen = nLength;
+				m_chPatternID = ctSingle.TypeID;
+				m_dblCost = ctSingle.CharSize;
+				m_ctSingle = ctSingle;
+			}
+		}
+
+		private sealed class QePathState
+		{
+			public readonly int Position;
+			public readonly List<QePatternInstance> Path;
+
+			public QePathState(int iPosition, List<QePatternInstance> lPath)
+			{
+				this.Position = iPosition;
+				this.Path = lPath;
+			}
+		}
+
+		private static object m_objSyncInit = new object();
+		private static List<QeCharType> m_lCharTypes = null;
+
+		private static void EnsureInitialized()
+		{
+			lock(m_objSyncInit)
+			{
+				if(m_lCharTypes == null)
+				{
+					string strSpecial = PwCharSet.PrintableAsciiSpecial;
+					if(strSpecial.IndexOf(' ') >= 0) { Debug.Assert(false); }
+					else strSpecial = strSpecial + " ";
+
+					int nSp = strSpecial.Length;
+					int nHi = PwCharSet.HighAnsiChars.Length;
+
+					m_lCharTypes = new List<QeCharType>();
+
+					m_lCharTypes.Add(new QeCharType(PatternID.LowerAlpha,
+						PwCharSet.LowerCase, true));
+					m_lCharTypes.Add(new QeCharType(PatternID.UpperAlpha,
+						PwCharSet.UpperCase, true));
+					m_lCharTypes.Add(new QeCharType(PatternID.Digit,
+						PwCharSet.Digits, true));
+					m_lCharTypes.Add(new QeCharType(PatternID.Special,
+						strSpecial, false));
+					m_lCharTypes.Add(new QeCharType(PatternID.High,
+						PwCharSet.HighAnsiChars, false));
+					m_lCharTypes.Add(new QeCharType(PatternID.Other,
+						0x10000 - (2 * 26) - 10 - nSp - nHi));
+				}
+			}
+		}
+
+		/// <summary>
+		/// Estimate the quality of a password.
+		/// </summary>
+		/// <param name="vPasswordChars">Password to check.</param>
+		/// <returns>Estimated bit-strength of the password.</returns>
+		public static uint EstimatePasswordBits(char[] vPasswordChars)
+		{
+			if(vPasswordChars == null) { Debug.Assert(false); return 0; }
+			if(vPasswordChars.Length == 0) return 0;
+
+			EnsureInitialized();
+
+			int n = vPasswordChars.Length;
+			List<QePatternInstance>[] vPatterns = new List<QePatternInstance>[n];
+			for(int i = 0; i < n; ++i)
+			{
+				vPatterns[i] = new List<QePatternInstance>();
+
+				QePatternInstance piChar = new QePatternInstance(i, 1,
+					GetCharType(vPasswordChars[i]));
+				vPatterns[i].Add(piChar);
+			}
+
+			FindRepetitions(vPasswordChars, vPatterns);
+			FindNumbers(vPasswordChars, vPatterns);
+			FindDiffSeqs(vPasswordChars, vPatterns);
+			FindPopularPasswords(vPasswordChars, vPatterns);
+
+			// Encoders must not be static, because the entropy estimation
+			// may run concurrently in multiple threads and the encoders are
+			// not read-only
+			EntropyEncoder ecPattern = new EntropyEncoder(PatternID.All, 0, 1, 0);
+			MultiEntropyEncoder mcData = new MultiEntropyEncoder();
+			for(int i = 0; i < (m_lCharTypes.Count - 1); ++i)
+			{
+				// Let m be the alphabet size. In order to ensure that two same
+				// characters cost at least as much as a single character, for
+				// the probability p and weight w of the character it must hold:
+				//     -log(1/m) >= -2*log(p)
+				// <=> log(1/m) <= log(p^2) <=> 1/m <= p^2 <=> p >= sqrt(1/m);
+				//     sqrt(1/m) = (1+w)/(m+w)
+				// <=> m+w = (1+w)*sqrt(m) <=> m+w = sqrt(m) + w*sqrt(m)
+				// <=> w*(1-sqrt(m)) = sqrt(m) - m <=> w = (sqrt(m)-m)/(1-sqrt(m))
+				// <=> w = (sqrt(m)-m)*(1+sqrt(m))/(1-m)
+				// <=> w = (sqrt(m)-m+m-m*sqrt(m))/(1-m) <=> w = sqrt(m)
+				ulong uw = (ulong)Math.Sqrt((double)m_lCharTypes[i].CharCount);
+
+				mcData.AddEncoder(m_lCharTypes[i].TypeID, new EntropyEncoder(
+					m_lCharTypes[i].Alphabet, 1, uw, 1));
+			}
+
+			double dblMinCost = (double)int.MaxValue;
+			int tStart = Environment.TickCount;
+
+			Stack<QePathState> sRec = new Stack<QePathState>();
+			sRec.Push(new QePathState(0, new List<QePatternInstance>()));
+			while(sRec.Count > 0)
+			{
+				int tDiff = Environment.TickCount - tStart;
+				if(tDiff > 500) break;
+
+				QePathState s = sRec.Pop();
+
+				if(s.Position >= n)
+				{
+					Debug.Assert(s.Position == n);
+
+					double dblCost = ComputePathCost(s.Path, vPasswordChars,
+						ecPattern, mcData);
+					if(dblCost < dblMinCost) dblMinCost = dblCost;
+				}
+				else
+				{
+					List<QePatternInstance> lSubs = vPatterns[s.Position];
+					for(int i = lSubs.Count - 1; i >= 0; --i)
+					{
+						QePatternInstance pi = lSubs[i];
+						Debug.Assert(pi.Position == s.Position);
+						Debug.Assert(pi.Length >= 1);
+
+						List<QePatternInstance> lNewPath =
+							new List<QePatternInstance>(s.Path.Count + 1);
+						lNewPath.AddRange(s.Path);
+						lNewPath.Add(pi);
+						Debug.Assert(lNewPath.Capacity == (s.Path.Count + 1));
+
+						QePathState sNew = new QePathState(s.Position +
+							pi.Length, lNewPath);
+						sRec.Push(sNew);
+					}
+				}
+			}
+
+			return (uint)Math.Ceiling(dblMinCost);
+		}
+
+		/// <summary>
+		/// Estimate the quality of a password.
+		/// </summary>
+		/// <param name="pbUnprotectedUtf8">Password to check, UTF-8 encoded.</param>
+		/// <returns>Estimated bit-strength of the password.</returns>
+		public static uint EstimatePasswordBits(byte[] pbUnprotectedUtf8)
+		{
+			if(pbUnprotectedUtf8 == null) { Debug.Assert(false); return 0; }
+
+			char[] vChars = StrUtil.Utf8.GetChars(pbUnprotectedUtf8);
+			uint uResult = EstimatePasswordBits(vChars);
+			MemUtil.ZeroArray<char>(vChars);
+
+			return uResult;
+		}
+
+		private static QeCharType GetCharType(char ch)
+		{
+			int nTypes = m_lCharTypes.Count;
+			Debug.Assert((nTypes > 0) && (m_lCharTypes[nTypes - 1].CharCount > 256));
+
+			for(int i = 0; i < (nTypes - 1); ++i)
+			{
+				if(m_lCharTypes[i].Contains(ch))
+					return m_lCharTypes[i];
+			}
+
+			return m_lCharTypes[nTypes - 1];
+		}
+
+		private static double ComputePathCost(List<QePatternInstance> l,
+			char[] vPassword, EntropyEncoder ecPattern, MultiEntropyEncoder mcData)
+		{
+			ecPattern.Reset();
+			for(int i = 0; i < l.Count; ++i)
+				ecPattern.Write(l[i].PatternID);
+			double dblPatternCost = ecPattern.GetOutputSize();
+
+			mcData.Reset();
+			double dblDataCost = 0.0;
+			foreach(QePatternInstance pi in l)
+			{
+				QeCharType tChar = pi.SingleCharType;
+				if(tChar != null)
+				{
+					char ch = vPassword[pi.Position];
+					if(!mcData.Write(tChar.TypeID, ch))
+						dblDataCost += pi.Cost;
+				}
+				else dblDataCost += pi.Cost;
+			}
+			dblDataCost += mcData.GetOutputSize();
+
+			return (dblPatternCost + dblDataCost);
+		}
+
+		private static void FindPopularPasswords(char[] vPassword,
+			List<QePatternInstance>[] vPatterns)
+		{
+			int n = vPassword.Length;
+
+			char[] vLower = new char[n];
+			char[] vLeet = new char[n];
+			for(int i = 0; i < n; ++i)
+			{
+				char ch = vPassword[i];
+
+				vLower[i] = char.ToLower(ch);
+				vLeet[i] = char.ToLower(DecodeLeetChar(ch));
+			}
+
+			char chErased = default(char);
+			Debug.Assert(chErased == char.MinValue);
+
+			int nMaxLen = Math.Min(n, PopularPasswords.MaxLength);
+			for(int nSubLen = nMaxLen; nSubLen >= 3; --nSubLen)
+			{
+				if(!PopularPasswords.ContainsLength(nSubLen)) continue;
+
+				char[] vSub = new char[nSubLen];
+
+				for(int i = 0; i <= (n - nSubLen); ++i)
+				{
+					if(Array.IndexOf<char>(vLower, chErased, i, nSubLen) >= 0)
+						continue;
+
+					Array.Copy(vLower, i, vSub, 0, nSubLen);
+					if(!EvalAddPopularPasswordPattern(vPatterns, vPassword,
+						i, vSub, 0.0))
+					{
+						Array.Copy(vLeet, i, vSub, 0, nSubLen);
+						if(EvalAddPopularPasswordPattern(vPatterns, vPassword,
+							i, vSub, 1.5))
+						{
+							Array.Clear(vLower, i, nSubLen); // Not vLeet
+							Debug.Assert(vLower[i] == chErased);
+						}
+					}
+					else
+					{
+						Array.Clear(vLower, i, nSubLen);
+						Debug.Assert(vLower[i] == chErased);
+					}
+				}
+			}
+		}
+
+		private static bool EvalAddPopularPasswordPattern(List<QePatternInstance>[] vPatterns,
+			char[] vPassword, int i, char[] vSub, double dblCostPerMod)
+		{
+			ulong uDictSize;
+			if(!PopularPasswords.IsPopularPassword(vSub, out uDictSize))
+				return false;
+
+			int n = vSub.Length;
+			int d = HammingDist(vSub, 0, vPassword, i, n);
+
+			double dblCost = Log2((double)uDictSize);
+
+			// dblCost += log2(n binom d)
+			int k = Math.Min(d, n - d);
+			for(int j = n; j > (n - k); --j)
+				dblCost += Log2(j);
+			for(int j = k; j >= 2; --j)
+				dblCost -= Log2(j);
+
+			dblCost += dblCostPerMod * (double)d;
+
+			vPatterns[i].Add(new QePatternInstance(i, n, PatternID.Dictionary,
+				dblCost));
+			return true;
+		}
+
+		private static char DecodeLeetChar(char chLeet)
+		{
+			if((chLeet >= '\u00C0') && (chLeet <= '\u00C6')) return 'a';
+			if((chLeet >= '\u00C8') && (chLeet <= '\u00CB')) return 'e';
+			if((chLeet >= '\u00CC') && (chLeet <= '\u00CF')) return 'i';
+			if((chLeet >= '\u00D2') && (chLeet <= '\u00D6')) return 'o';
+			if((chLeet >= '\u00D9') && (chLeet <= '\u00DC')) return 'u';
+			if((chLeet >= '\u00E0') && (chLeet <= '\u00E6')) return 'a';
+			if((chLeet >= '\u00E8') && (chLeet <= '\u00EB')) return 'e';
+			if((chLeet >= '\u00EC') && (chLeet <= '\u00EF')) return 'i';
+			if((chLeet >= '\u00F2') && (chLeet <= '\u00F6')) return 'o';
+			if((chLeet >= '\u00F9') && (chLeet <= '\u00FC')) return 'u';
+
+			char ch;
+			switch(chLeet)
+			{
+				case '4':
+				case '@':
+				case '?':
+				case '^':
+				case '\u00AA': ch = 'a'; break;
+				case '8':
+				case '\u00DF': ch = 'b'; break;
+				case '(':
+				case '{':
+				case '[':
+				case '<':
+				case '\u00A2':
+				case '\u00A9':
+				case '\u00C7':
+				case '\u00E7': ch = 'c'; break;
+				case '\u00D0':
+				case '\u00F0': ch = 'd'; break;
+				case '3':
+				case '\u20AC':
+				case '&':
+				case '\u00A3': ch = 'e'; break;
+				case '6':
+				case '9': ch = 'g'; break;
+				case '#': ch = 'h'; break;
+				case '1':
+				case '!':
+				case '|':
+				case '\u00A1':
+				case '\u00A6': ch = 'i'; break;
+				case '\u00D1':
+				case '\u00F1': ch = 'n'; break;
+				case '0':
+				case '*':
+				case '\u00A4': // Currency
+				case '\u00B0': // Degree
+				case '\u00D8':
+				case '\u00F8': ch = 'o'; break;
+				case '\u00AE': ch = 'r'; break;
+				case '$':
+				case '5':
+				case '\u00A7': ch = 's'; break;
+				case '+':
+				case '7': ch = 't'; break;
+				case '\u00B5': ch = 'u'; break;
+				case '%':
+				case '\u00D7': ch = 'x'; break;
+				case '\u00A5':
+				case '\u00DD':
+				case '\u00FD':
+				case '\u00FF': ch = 'y'; break;
+				case '2': ch = 'z'; break;
+				default: ch = chLeet; break;
+			}
+
+			return ch;
+		}
+
+		private static int HammingDist(char[] v1, int iOffset1,
+			char[] v2, int iOffset2, int nLength)
+		{
+			int nDist = 0;
+			for(int i = 0; i < nLength; ++i)
+			{
+				if(v1[iOffset1 + i] != v2[iOffset2 + i]) ++nDist;
+			}
+
+			return nDist;
+		}
+
+		private static void FindRepetitions(char[] vPassword,
+			List<QePatternInstance>[] vPatterns)
+		{
+			int n = vPassword.Length;
+			char[] v = new char[n];
+			Array.Copy(vPassword, v, n);
+
+			char chErased = char.MaxValue;
+			for(int m = (n / 2); m >= 3; --m)
+			{
+				for(int x1 = 0; x1 <= (n - (2 * m)); ++x1)
+				{
+					bool bFoundRep = false;
+
+					for(int x2 = (x1 + m); x2 <= (n - m); ++x2)
+					{
+						if(PartsEqual(v, x1, x2, m))
+						{
+							double dblCost = Log2(x1 + 1) + Log2(m);
+							vPatterns[x2].Add(new QePatternInstance(x2, m,
+								PatternID.Repetition, dblCost));
+
+							ErasePart(v, x2, m, ref chErased);
+							bFoundRep = true;
+						}
+					}
+
+					if(bFoundRep) ErasePart(v, x1, m, ref chErased);
+				}
+			}
+		}
+
+		private static bool PartsEqual(char[] v, int x1, int x2, int nLength)
+		{
+			for(int i = 0; i < nLength; ++i)
+			{
+				if(v[x1 + i] != v[x2 + i]) return false;
+			}
+
+			return true;
+		}
+
+		private static void ErasePart(char[] v, int i, int n, ref char chErased)
+		{
+			for(int j = 0; j < n; ++j)
+			{
+				v[i + j] = chErased;
+				--chErased;
+			}
+		}
+
+		private static void FindNumbers(char[] vPassword,
+			List<QePatternInstance>[] vPatterns)
+		{
+			int n = vPassword.Length;
+			StringBuilder sb = new StringBuilder();
+			for(int i = 0; i < n; ++i)
+			{
+				char ch = vPassword[i];
+				if((ch >= '0') && (ch <= '9')) sb.Append(ch);
+				else
+				{
+					AddNumberPattern(vPatterns, sb.ToString(), i - sb.Length);
+					sb.Remove(0, sb.Length);
+				}
+			}
+			AddNumberPattern(vPatterns, sb.ToString(), n - sb.Length);
+		}
+
+		private static void AddNumberPattern(List<QePatternInstance>[] vPatterns,
+			string strNumber, int i)
+		{
+			if(strNumber.Length <= 2) return;
+
+			int nZeros = 0;
+			for(int j = 0; j < strNumber.Length; ++j)
+			{
+				if(strNumber[j] != '0') break;
+				++nZeros;
+			}
+
+			double dblCost = Log2(nZeros + 1);
+			if(nZeros < strNumber.Length)
+			{
+				string strNonZero = strNumber.Substring(nZeros);
+
+#if KeePassLibSD
+				try { dblCost += Log2(double.Parse(strNonZero)); }
+				catch(Exception) { Debug.Assert(false); return; }
+#else
+				double d;
+				if(double.TryParse(strNonZero, out d))
+					dblCost += Log2(d);
+				else { Debug.Assert(false); return; }
+#endif
+			}
+
+			vPatterns[i].Add(new QePatternInstance(i, strNumber.Length,
+				PatternID.Number, dblCost));
+		}
+
+		private static void FindDiffSeqs(char[] vPassword,
+			List<QePatternInstance>[] vPatterns)
+		{
+			int d = int.MinValue, p = 0;
+			string str = new string(vPassword) + new string(char.MaxValue, 1);
+
+			for(int i = 1; i < str.Length; ++i)
+			{
+				int dCur = (int)str[i] - (int)str[i - 1];
+				if(dCur != d)
+				{
+					if((i - p) >= 3) // At least 3 chars involved
+					{
+						QeCharType ct = GetCharType(str[p]);
+						double dblCost = ct.CharSize + Log2(i - p - 1);
+
+						vPatterns[p].Add(new QePatternInstance(p,
+							i - p, PatternID.DiffSeq, dblCost));
+					}
+
+					d = dCur;
+					p = i - 1;
+				}
+			}
+		}
+
+		private static double Log2(double dblValue)
+		{
+#if KeePassLibSD
+			return (Math.Log(dblValue) / Math.Log(2.0));
+#else
+			return Math.Log(dblValue, 2.0);
+#endif
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Delegates/Handlers.cs

@@ -0,0 +1,49 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+namespace KeePassLib.Delegates
+{
+	/// <summary>
+	/// Function definition of a method that performs an action on a group.
+	/// When traversing the internal tree, this function will be invoked
+	/// for all visited groups.
+	/// </summary>
+	/// <param name="pg">Currently visited group.</param>
+	/// <returns>You must return <c>true</c> if you want to continue the
+	/// traversal. If you want to immediately stop the whole traversal,
+	/// return <c>false</c>.</returns>
+	public delegate bool GroupHandler(PwGroup pg);
+
+	/// <summary>
+	/// Function definition of a method that performs an action on an entry.
+	/// When traversing the internal tree, this function will be invoked
+	/// for all visited entries.
+	/// </summary>
+	/// <param name="pe">Currently visited entry.</param>
+	/// <returns>You must return <c>true</c> if you want to continue the
+	/// traversal. If you want to immediately stop the whole traversal,
+	/// return <c>false</c>.</returns>
+	public delegate bool EntryHandler(PwEntry pe);
+
+	public delegate void VoidDelegate();
+
+	public delegate string StrPwEntryDelegate(string str, PwEntry pe);
+}

src/KeePassLib2AndroidSdkStyle/IDatabaseFormat.cs

@@ -0,0 +1,28 @@
+using System.IO;
+using KeePassLib.Interfaces;
+using KeePassLib.Keys;
+
+namespace KeePassLib
+{
+	public interface IDatabaseFormat
+	{
+		void PopulateDatabaseFromStream(PwDatabase db, Stream s, IStatusLogger slLogger);
+
+		byte[] HashOfLastStream { get; }
+
+		bool CanWrite { get;  }
+		string SuccessMessage { get; }
+		void Save(PwDatabase kpDatabase, Stream stream);
+
+		bool CanHaveEntriesInRootGroup { get; }
+		bool CanHaveMultipleAttachments { get;  }
+		bool CanHaveCustomFields { get;  }
+		bool HasDefaultUsername { get; }
+		bool HasDatabaseName { get; }
+		bool SupportsAttachmentKeys { get;  }
+		bool SupportsTags { get; }
+		bool SupportsOverrideUrl { get; }
+		bool CanRecycle { get; }
+		bool SupportsTemplates { get; }
+	}
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/IDeepCloneable.cs

@@ -0,0 +1,37 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+
+namespace KeePassLib.Interfaces
+{
+	/// <summary>
+	/// Interface for objects that are deeply cloneable.
+	/// </summary>
+	/// <typeparam name="T">Reference type.</typeparam>
+	public interface IDeepCloneable<T> where T : class
+	{
+		/// <summary>
+		/// Deeply clone the object.
+		/// </summary>
+		/// <returns>Cloned object.</returns>
+		T CloneDeep();
+	}
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/IStatusLogger.cs

@@ -0,0 +1,105 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+
+namespace KeePassLib.Interfaces
+{
+	/// <summary>
+	/// Status message types.
+	/// </summary>
+	public enum LogStatusType
+	{
+		/// <summary>
+		/// Default type: simple information type.
+		/// </summary>
+		Info = 0,
+
+		/// <summary>
+		/// Warning message.
+		/// </summary>
+		Warning,
+
+		/// <summary>
+		/// Error message.
+		/// </summary>
+		Error,
+
+		/// <summary>
+		/// Additional information. Depends on lines above.
+		/// </summary>
+		AdditionalInfo
+	}
+
+	/// <summary>
+	/// Status logging interface.
+	/// </summary>
+	public interface IStatusLogger
+	{
+		/// <summary>
+		/// Function which needs to be called when logging is started.
+		/// </summary>
+		/// <param name="strOperation">This string should roughly describe
+		/// the operation, of which the status is logged.</param>
+		/// <param name="bWriteOperationToLog">Specifies whether the
+		/// operation is written to the log or not.</param>
+		void StartLogging(string strOperation, bool bWriteOperationToLog);
+
+		/// <summary>
+		/// Function which needs to be called when logging is ended
+		/// (i.e. when no more messages will be logged and when the
+		/// percent value won't change any more).
+		/// </summary>
+		void EndLogging();
+
+		/// <summary>
+		/// Set the current progress in percent.
+		/// </summary>
+		/// <param name="uPercent">Percent of work finished.</param>
+		/// <returns>Returns <c>true</c> if the caller should continue
+		/// the current work.</returns>
+		bool SetProgress(uint uPercent);
+
+		/// <summary>
+		/// Set the current status text.
+		/// </summary>
+		/// <param name="strNewText">Status text.</param>
+		/// <param name="lsType">Type of the message.</param>
+		/// <returns>Returns <c>true</c> if the caller should continue
+		/// the current work.</returns>
+		bool SetText(string strNewText, LogStatusType lsType);
+
+		/// <summary>
+		/// Check if the user cancelled the current work.
+		/// </summary>
+		/// <returns>Returns <c>true</c> if the caller should continue
+		/// the current work.</returns>
+		bool ContinueWork();
+	}
+
+	public sealed class NullStatusLogger : IStatusLogger
+	{
+		public void StartLogging(string strOperation, bool bWriteOperationToLog) { }
+		public void EndLogging() { }
+		public bool SetProgress(uint uPercent) { return true; }
+		public bool SetText(string strNewText, LogStatusType lsType) { return true; }
+		public bool ContinueWork() { return true; }
+	}
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/IStructureItem.cs

@@ -0,0 +1,42 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+namespace KeePassLib.Interfaces
+{
+    public interface IStructureItem : ITimeLogger // Provides LocationChanged
+    {
+        PwUuid Uuid
+        {
+            get;
+            set;
+        }
+
+        PwGroup ParentGroup
+        {
+            get;
+        }
+
+        PwUuid PreviousParentGroup
+        {
+            get;
+        }
+    }
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/ITimeLogger.cs

@@ -0,0 +1,105 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+namespace KeePassLib.Interfaces
+{
+	/// <summary>
+	/// Interface for objects that support various times (creation time, last
+	/// access time, last modification time and expiry time). Offers
+	/// several helper functions (for example a function to touch the current
+	/// object).
+	/// </summary>
+	public interface ITimeLogger
+	{
+		/// <summary>
+		/// The date/time when the object was created.
+		/// </summary>
+		DateTime CreationTime
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// The date/time when the object was last modified.
+		/// </summary>
+		DateTime LastModificationTime
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// The date/time when the object was last accessed.
+		/// </summary>
+		DateTime LastAccessTime
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// The date/time when the object expires.
+		/// </summary>
+		DateTime ExpiryTime
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// Flag that determines if the object does expire.
+		/// </summary>
+		bool Expires
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// Get or set the usage count of the object. To increase the usage
+		/// count by one, use the <c>Touch</c> function.
+		/// </summary>
+		ulong UsageCount
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// The date/time when the location of the object was last changed.
+		/// </summary>
+		DateTime LocationChanged
+		{
+			get;
+			set;
+		}
+
+		/// <summary>
+		/// Touch the object. This function updates the internal last access
+		/// time. If the <paramref name="bModified" /> parameter is <c>true</c>,
+		/// the last modification time gets updated, too. Each time you call
+		/// <c>Touch</c>, the usage count of the object is increased by one.
+		/// </summary>
+		/// <param name="bModified">Update last modification time.</param>
+		void Touch(bool bModified);
+	}
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/IUIOperations.cs

@@ -0,0 +1,37 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace KeePassLib.Interfaces
+{
+	public interface IUIOperations
+	{
+		/// <summary>
+		/// Let the user interface save the current database.
+		/// </summary>
+		/// <param name="bForceSave">If <c>true</c>, the UI will not ask for
+		/// whether to synchronize or overwrite, it'll simply overwrite the
+		/// file.</param>
+		/// <returns>Returns <c>true</c> if the file has been saved.</returns>
+		bool UIFileSave(bool bForceSave);
+	}
+}

src/KeePassLib2AndroidSdkStyle/Interfaces/IXmlSerializerEx.cs

@@ -0,0 +1,33 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using System.Xml;
+
+namespace KeePassLib.Interfaces
+{
+	public interface IXmlSerializerEx
+	{
+		void Serialize(XmlWriter xmlWriter, object o);
+		object Deserialize(Stream s);
+	}
+}

src/KeePassLib2AndroidSdkStyle/KeePassLib2AndroidSdkStyle.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-android</TargetFramework>
+    <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Resources\values\Strings.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="System.Security.Cryptography.ProtectedData" Version="8.0.0" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\keepass2android-appSdkStyle\keepass2android-appSdkStyle.csproj" />
+    <ProjectReference Include="..\KP2AKdbLibraryBindingSdkStyle\KP2AKdbLibraryBindingSdkStyle.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Update="Resources\values\Strings.xml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:UpdateGeneratedFiles</Generator>
+    </AndroidResource>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Update="Serialization\IOConnection.cs">
+      <SubType>Component</SubType>
+    </Compile>
+  </ItemGroup>
+</Project>

src/KeePassLib2AndroidSdkStyle/Keys/CompositeKey.cs

@@ -0,0 +1,279 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using KeePassLib.Cryptography;
+using KeePassLib.Cryptography.KeyDerivation;
+using KeePassLib.Resources;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Keys
+{
+	/// <summary>
+	/// Represents a key. A key can be build up using several user key data sources
+	/// like a password, a key file, the currently logged on user credentials,
+	/// the current computer ID, etc.
+	/// </summary>
+	public sealed class CompositeKey
+	{
+		private List<IUserKey> m_vUserKeys = new List<IUserKey>();
+
+		/// <summary>
+		/// List of all user keys contained in the current composite key.
+		/// </summary>
+		public IEnumerable<IUserKey> UserKeys
+		{
+			get { return m_vUserKeys; }
+		}
+
+		public uint UserKeyCount
+		{
+			get { return (uint)m_vUserKeys.Count; }
+		}
+
+		/// <summary>
+		/// Construct a new, empty key object.
+		/// </summary>
+		public CompositeKey()
+		{
+		}
+
+		// /// <summary>
+		// /// Deconstructor, clears up the key.
+		// /// </summary>
+		// ~CompositeKey()
+		// {
+		//	Clear();
+		// }
+
+		// /// <summary>
+		// /// Clears the key. This function also erases all previously stored
+		// /// user key data objects.
+		// /// </summary>
+		// public void Clear()
+		// {
+		//	foreach(IUserKey pKey in m_vUserKeys)
+		//		pKey.Clear();
+		//	m_vUserKeys.Clear();
+		// }
+
+		/// <summary>
+		/// Add a user key.
+		/// </summary>
+		/// <param name="pKey">User key to add.</param>
+		public void AddUserKey(IUserKey pKey)
+		{
+			Debug.Assert(pKey != null); if(pKey == null) throw new ArgumentNullException("pKey");
+
+			m_vUserKeys.Add(pKey);
+		}
+
+		/// <summary>
+		/// Remove a user key.
+		/// </summary>
+		/// <param name="pKey">User key to remove.</param>
+		/// <returns>Returns <c>true</c> if the key was removed successfully.</returns>
+		public bool RemoveUserKey(IUserKey pKey)
+		{
+			Debug.Assert(pKey != null); if(pKey == null) throw new ArgumentNullException("pKey");
+
+			Debug.Assert(m_vUserKeys.IndexOf(pKey) >= 0);
+			return m_vUserKeys.Remove(pKey);
+		}
+
+		/// <summary>
+		/// Test whether the composite key contains a specific type of
+		/// user keys (password, key file, ...). If at least one user
+		/// key of that type is present, the function returns <c>true</c>.
+		/// </summary>
+		/// <param name="tUserKeyType">User key type.</param>
+		/// <returns>Returns <c>true</c>, if the composite key contains
+		/// a user key of the specified type.</returns>
+		public bool ContainsType(Type tUserKeyType)
+		{
+			Debug.Assert(tUserKeyType != null);
+			if(tUserKeyType == null) throw new ArgumentNullException("tUserKeyType");
+
+			foreach(IUserKey pKey in m_vUserKeys)
+			{
+				if(pKey == null) { Debug.Assert(false); continue; }
+
+#if KeePassUAP
+				if(pKey.GetType() == tUserKeyType)
+					return true;
+#else
+				if(tUserKeyType.IsInstanceOfType(pKey))
+					return true;
+#endif
+			}
+
+			return false;
+		}
+
+		/// <summary>
+		/// Get the first user key of a specified type.
+		/// </summary>
+		/// <param name="tUserKeyType">Type of the user key to get.</param>
+		/// <returns>Returns the first user key of the specified type
+		/// or <c>null</c> if no key of that type is found.</returns>
+		public IUserKey GetUserKey(Type tUserKeyType)
+		{
+			Debug.Assert(tUserKeyType != null);
+			if(tUserKeyType == null) throw new ArgumentNullException("tUserKeyType");
+
+			foreach(IUserKey pKey in m_vUserKeys)
+			{
+				if(pKey == null) { Debug.Assert(false); continue; }
+
+#if KeePassUAP
+				if(pKey.GetType() == tUserKeyType)
+					return pKey;
+#else
+				if(tUserKeyType.IsInstanceOfType(pKey))
+					return pKey;
+#endif
+			}
+
+			return null;
+		}
+
+		public T GetUserKey<T>() where T : IUserKey
+		{
+			return (T) GetUserKey(typeof (T));
+		}
+
+		/// <summary>
+		/// Creates the composite key from the supplied user key sources (password,
+		/// key file, user account, computer ID, etc.).
+		/// </summary>
+		private byte[] CreateRawCompositeKey32(byte[] mPbMasterSeed, byte[] mPbKdfSeed)
+		{
+			ValidateUserKeys();
+
+			// Concatenate user key data
+			List<byte[]> lData = new List<byte[]>();
+			int cbData = 0;
+			foreach(IUserKey pKey in m_vUserKeys)
+			{
+				if (pKey is ISeedBasedUserKey)
+					((ISeedBasedUserKey)pKey).SetParams(mPbMasterSeed, mPbKdfSeed);
+				ProtectedBinary b = pKey.KeyData;
+				if(b != null)
+				{
+					byte[] pbKeyData = b.ReadData();
+					lData.Add(pbKeyData);
+					cbData += pbKeyData.Length;
+				}
+			}
+
+			byte[] pbAllData = new byte[cbData];
+			int p = 0;
+			foreach(byte[] pbData in lData)
+			{
+				Array.Copy(pbData, 0, pbAllData, p, pbData.Length);
+				p += pbData.Length;
+				MemUtil.ZeroByteArray(pbData);
+			}
+			Debug.Assert(p == cbData);
+
+			byte[] pbHash = CryptoUtil.HashSha256(pbAllData);
+			MemUtil.ZeroByteArray(pbAllData);
+			return pbHash;
+		}
+
+
+		/// <summary>
+		/// Generate a 32-byte (256-bit) key from the composite key.
+		/// </summary>
+		public ProtectedBinary GenerateKey32(KdfParameters p, byte[] mPbMasterSeed)
+		{
+			if(p == null) { Debug.Assert(false); throw new ArgumentNullException("p"); }
+
+
+		    KdfEngine kdf = KdfPool.Get(p.KdfUuid);
+		    if (kdf == null) // CryptographicExceptions are translated to "file corrupted"
+		        throw new Exception(KLRes.UnknownKdf + MessageService.NewParagraph +
+		                            KLRes.FileNewVerOrPlgReq + MessageService.NewParagraph +
+		                            "UUID: " + p.KdfUuid.ToHexString() + ".");
+
+            byte[] pbRaw32 = CreateRawCompositeKey32(mPbMasterSeed, kdf.GetSeed(p));
+			if((pbRaw32 == null) || (pbRaw32.Length != 32))
+				{ Debug.Assert(false); return null; }
+
+
+			byte[] pbTrf32 = kdf.Transform(pbRaw32, p);
+			if(pbTrf32 == null) { Debug.Assert(false); return null; }
+
+			if(pbTrf32.Length != 32)
+			{
+				Debug.Assert(false);
+				pbTrf32 = CryptoUtil.HashSha256(pbTrf32);
+			}
+
+			ProtectedBinary pbRet = new ProtectedBinary(true, pbTrf32);
+			MemUtil.ZeroByteArray(pbTrf32);
+			MemUtil.ZeroByteArray(pbRaw32);
+			return pbRet;
+		}
+
+		private void ValidateUserKeys()
+		{
+			int nAccounts = 0;
+
+			foreach(IUserKey uKey in m_vUserKeys)
+			{
+				if(uKey is KcpUserAccount)
+					++nAccounts;
+			}
+
+			if(nAccounts >= 2)
+			{
+				Debug.Assert(false);
+				throw new InvalidOperationException();
+			}
+		}
+	}
+
+	public interface ISeedBasedUserKey
+	{
+		void SetParams(byte[] masterSeed, byte[] mPbKdfSeed);
+	}
+
+	public sealed class InvalidCompositeKeyException : Exception
+	{
+		public override string Message
+		{
+			get
+			{
+				return KLRes.InvalidCompositeKey + MessageService.NewParagraph +
+					KLRes.InvalidCompositeKeyHint;
+			}
+		}
+
+		/// <summary>
+		/// Construct a new invalid composite key exception.
+		/// </summary>
+		public InvalidCompositeKeyException()
+		{
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/IUserKey.cs

@@ -0,0 +1,48 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+using KeePassLib.Security;
+
+namespace KeePassLib.Keys
+{
+	/// <summary>
+	/// Interface to a user key, like a password, key file data, etc.
+	/// </summary>
+	public interface IUserKey
+	{
+		/// <summary>
+		/// Get key data. Querying this property is fast (it returns a
+		/// reference to a cached <c>ProtectedBinary</c> object).
+		/// If no key data is available, <c>null</c> is returned.
+		/// </summary>
+		ProtectedBinary KeyData
+		{
+			get;
+		}
+
+        // /// <summary>
+        // /// Clear the key and securely erase all security-critical information.
+        // /// </summary>
+        // void Clear();
+
+        uint GetMinKdbxVersion();
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KcpCustomKey.cs

@@ -0,0 +1,73 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Cryptography;
+using KeePassLib.Security;
+
+namespace KeePassLib.Keys
+{
+	public sealed class KcpCustomKey : IUserKey
+	{
+		private readonly string m_strName;
+		private ProtectedBinary m_pbKey;
+
+		/// <summary>
+		/// Name of the provider that generated the custom key.
+		/// </summary>
+		public string Name
+		{
+			get { return m_strName; }
+		}
+
+		public ProtectedBinary KeyData
+		{
+			get { return m_pbKey; }
+		}
+
+	    public uint GetMinKdbxVersion()
+	    {
+	        return 0;
+	    }
+
+	    public KcpCustomKey(string strName, byte[] pbKeyData, bool bPerformHash)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+			Debug.Assert(pbKeyData != null); if(pbKeyData == null) throw new ArgumentNullException("pbKeyData");
+
+			m_strName = strName;
+
+			if(bPerformHash)
+			{
+				byte[] pbRaw = CryptoUtil.HashSha256(pbKeyData);
+				m_pbKey = new ProtectedBinary(true, pbRaw);
+			}
+			else m_pbKey = new ProtectedBinary(true, pbKeyData);
+		}
+
+		// public void Clear()
+		// {
+		//	m_pbKey = null;
+		// }
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KcpKeyFile.Xml.cs

@@ -0,0 +1,281 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Xml.Serialization;
+
+using KeePassLib.Cryptography;
+using KeePassLib.Resources;
+using KeePassLib.Serialization;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Keys
+{
+	[XmlType("KeyFile")]
+	public sealed class KfxFile
+	{
+		private const ulong KfxVersionCriticalMask = 0xFFFF000000000000UL;
+		private const int KfxDataHashLength = 4;
+
+		private KfxMeta m_meta = new KfxMeta();
+		public KfxMeta Meta
+		{
+			get { return m_meta; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_meta = value;
+			}
+		}
+
+		private KfxKey m_key = new KfxKey();
+		public KfxKey Key
+		{
+			get { return m_key; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_key = value;
+			}
+		}
+
+		public static KfxFile Create(ulong uVersion, byte[] pbKey, byte[] pbHash)
+		{
+			if(pbKey == null) throw new ArgumentNullException("pbKey");
+			if(pbKey.Length == 0) throw new ArgumentOutOfRangeException("pbKey");
+
+			if(uVersion == 0) uVersion = 0x0002000000000000;
+
+			// Null hash: generate one, empty hash: store no hash
+			if(pbHash == null) pbHash = HashData(pbKey);
+			VerifyHash(pbKey, pbHash);
+
+			KfxFile kf = new KfxFile();
+
+			if(uVersion == 0x0001000000000000)
+				kf.Meta.Version = "1.00"; // KeePass <= 2.46 used two zeros
+			else kf.Meta.Version = StrUtil.VersionToString(uVersion, 2);
+
+			if(uVersion == 0x0001000000000000)
+				kf.Key.Data.Value = Convert.ToBase64String(pbKey);
+			else if(uVersion == 0x0002000000000000)
+			{
+				kf.Key.Data.Value = FormatKeyHex(pbKey, 3);
+
+				if(pbHash.Length != 0)
+					kf.Key.Data.Hash = MemUtil.ByteArrayToHexString(pbHash);
+			}
+			else throw new NotSupportedException(KLRes.FileVersionUnsupported);
+
+			return kf;
+		}
+
+		internal static KfxFile Create(ulong uVersion, string strKey, string strHash)
+		{
+			byte[] pbKey = ParseKey(uVersion, strKey);
+			byte[] pbHash = ((strHash != null) ? ParseHash(strHash) : null);
+
+			return Create(uVersion, pbKey, pbHash);
+		}
+
+		internal static bool CanLoad(string strFilePath)
+		{
+			if(string.IsNullOrEmpty(strFilePath)) { Debug.Assert(false); return false; }
+
+			try
+			{
+				IOConnectionInfo ioc = IOConnectionInfo.FromPath(strFilePath);
+				using(Stream s = IOConnection.OpenRead(ioc))
+				{
+					return (Load(s) != null);
+				}
+			}
+			catch(Exception) { }
+
+			return false;
+		}
+
+		public static KfxFile Load(Stream s)
+		{
+			return XmlUtilEx.Deserialize<KfxFile>(s);
+		}
+
+		public void Save(Stream s)
+		{
+			XmlUtilEx.Serialize<KfxFile>(s, this, true);
+		}
+
+		private static string FormatKeyHex(byte[] pb, int cTabs)
+		{
+			StringBuilder sb = new StringBuilder();
+			string str = MemUtil.ByteArrayToHexString(pb);
+
+			for(int i = 0; i < str.Length; ++i)
+			{
+				if((i & 0x1F) == 0)
+				{
+					sb.AppendLine();
+					sb.Append('\t', cTabs);
+				}
+				else if((i & 0x07) == 0) sb.Append(' ');
+
+				sb.Append(str[i]);
+			}
+
+			sb.AppendLine();
+			if(cTabs > 0) sb.Append('\t', cTabs - 1);
+			return sb.ToString();
+		}
+
+		private ulong GetVersion()
+		{
+			string str = m_meta.Version;
+			if(string.IsNullOrEmpty(str)) return 0;
+
+			return StrUtil.ParseVersion(str);
+		}
+
+		public byte[] GetKey()
+		{
+			ulong uVersion = GetVersion();
+
+			byte[] pbKey = ParseKey(uVersion, m_key.Data.Value);
+			if((pbKey == null) || (pbKey.Length == 0))
+				throw new FormatException(KLRes.FileCorrupted);
+
+			byte[] pbHash = ParseHash(m_key.Data.Hash);
+			VerifyHash(pbKey, pbHash);
+
+			return pbKey;
+		}
+
+		private static byte[] HashData(byte[] pb)
+		{
+			return MemUtil.Mid(CryptoUtil.HashSha256(pb), 0, KfxDataHashLength);
+		}
+
+		private static void VerifyHash(byte[] pbKey, byte[] pbHash)
+		{
+			// The hash is optional; empty hash means success
+			if((pbHash == null) || (pbHash.Length == 0)) return;
+
+			byte[] pbHashCmp = HashData(pbKey);
+			if(!MemUtil.ArraysEqual(pbHash, pbHashCmp))
+				throw new Exception("Keyfile hash mismatch!");
+		}
+
+		private static byte[] ParseKey(ulong uVersion, string strKey)
+		{
+			if(strKey == null) throw new ArgumentNullException("strKey");
+
+			strKey = StrUtil.RemoveWhiteSpace(strKey);
+			if(string.IsNullOrEmpty(strKey)) return MemUtil.EmptyByteArray;
+
+			uVersion &= KfxVersionCriticalMask;
+
+			byte[] pbKey;
+			if(uVersion == 0x0001000000000000)
+				pbKey = Convert.FromBase64String(strKey);
+			else if(uVersion == 0x0002000000000000)
+				pbKey = ParseHex(strKey);
+			else throw new NotSupportedException(KLRes.FileVersionUnsupported);
+
+			return pbKey;
+		}
+
+		private static byte[] ParseHash(string strHash)
+		{
+			return ParseHex(strHash);
+		}
+
+		private static byte[] ParseHex(string str)
+		{
+			if(str == null) throw new ArgumentNullException("str");
+			if(str.Length == 0) return MemUtil.EmptyByteArray;
+
+			if(((str.Length & 1) != 0) || !StrUtil.IsHexString(str, true))
+				throw new FormatException();
+
+			return MemUtil.HexStringToByteArray(str);
+		}
+	}
+
+	public sealed class KfxMeta
+	{
+		private string m_strVersion = string.Empty;
+		[DefaultValue("")]
+		public string Version
+		{
+			get { return m_strVersion; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strVersion = value;
+			}
+		}
+	}
+
+	public sealed class KfxKey
+	{
+		private KfxData m_data = new KfxData();
+		public KfxData Data
+		{
+			get { return m_data; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_data = value;
+			}
+		}
+	}
+
+	public sealed class KfxData
+	{
+		private string m_strHash = string.Empty;
+		[DefaultValue("")]
+		[XmlAttribute("Hash")]
+		public string Hash
+		{
+			get { return m_strHash; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strHash = value;
+			}
+		}
+
+		private string m_strValue = string.Empty;
+		[DefaultValue("")]
+		[XmlText]
+		public string Value
+		{
+			get { return m_strValue; }
+			set
+			{
+				if(value == null) throw new ArgumentNullException("value");
+				m_strValue = value;
+			}
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KcpKeyFile.cs

@@ -0,0 +1,358 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Security;
+using System.Text;
+using System.Xml;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Cryptography;
+using KeePassLib.Resources;
+using KeePassLib.Security;
+using KeePassLib.Serialization;
+using KeePassLib.Utility;
+using InvalidDataException = KeePassLib.Serialization.InvalidDataException;
+
+namespace KeePassLib.Keys
+{
+	/// <summary>
+	/// Key files as provided by the user.
+	/// </summary>
+	public sealed class KcpKeyFile : IUserKey
+	{
+		private IOConnectionInfo m_ioc;
+		private ProtectedBinary m_pbKeyData;
+		private ProtectedBinary m_pbFileData;
+
+		/// <summary>
+		/// Path to the key file.
+		/// </summary>
+		public string Path
+		{
+			get { return m_ioc.Path; }
+		}
+
+		/// <summary>
+		/// Get key data. Querying this property is fast (it returns a
+		/// reference to a cached <c>ProtectedBinary</c> object).
+		/// If no key data is available, <c>null</c> is returned.
+		/// </summary>
+		public ProtectedBinary KeyData
+		{
+			get { return m_pbKeyData; }
+		}
+
+	    public uint GetMinKdbxVersion()
+	    {
+	        return 0;
+	    }
+
+	    public IOConnectionInfo Ioc
+		{
+			get { return m_ioc; }
+		}
+
+		public ProtectedBinary RawFileData
+		{
+			get { return m_pbFileData; }
+		}
+
+		public KcpKeyFile(string strKeyFile)
+		{
+			Construct(IOConnectionInfo.FromPath(strKeyFile), false);
+		}
+
+		public KcpKeyFile(string strKeyFile, bool bThrowIfDbFile)
+		{
+			Construct(IOConnectionInfo.FromPath(strKeyFile), bThrowIfDbFile);
+		}
+
+		public KcpKeyFile(IOConnectionInfo iocKeyFile)
+		{
+			Construct(iocKeyFile, false);
+		}
+
+		public KcpKeyFile(IOConnectionInfo iocKeyFile, bool bThrowIfDbFile)
+		{
+			Construct(iocKeyFile, bThrowIfDbFile);
+		}
+
+		public KcpKeyFile(byte[] keyFileContents, IOConnectionInfo iocKeyFile, bool bThrowIfDbFile)
+		{
+			Construct(keyFileContents, iocKeyFile, bThrowIfDbFile);
+		}
+
+		private void Construct(byte[] pbFileData, IOConnectionInfo iocKeyFile, bool bThrowIfDbFile)
+		{
+			if (pbFileData == null) throw new Java.IO.FileNotFoundException();
+			m_pbFileData = new ProtectedBinary(true, pbFileData);
+
+			if(bThrowIfDbFile && (pbFileData.Length >= 8))
+			{
+				uint uSig1 = MemUtil.BytesToUInt32(MemUtil.Mid(pbFileData, 0, 4));
+				uint uSig2 = MemUtil.BytesToUInt32(MemUtil.Mid(pbFileData, 4, 4));
+
+				if(((uSig1 == KdbxFile.FileSignature1) &&
+					(uSig2 == KdbxFile.FileSignature2)) ||
+					((uSig1 == KdbxFile.FileSignaturePreRelease1) &&
+					(uSig2 == KdbxFile.FileSignaturePreRelease2)) ||
+					((uSig1 == KdbxFile.FileSignatureOld1) &&
+					(uSig2 == KdbxFile.FileSignatureOld2)))
+#if KeePassLibSD
+					throw new Exception(KLRes.KeyFileDbSel);
+#else
+					throw new InvalidDataException(KLRes.KeyFileDbSel);
+#endif
+			}
+
+            byte[] pbKey = LoadKeyFile(pbFileData);
+
+			if (pbKey == null) throw new InvalidOperationException();
+
+			m_ioc = iocKeyFile;
+			m_pbKeyData = new ProtectedBinary(true, pbKey);
+
+			MemUtil.ZeroByteArray(pbKey);
+		}
+
+		private void Construct(IOConnectionInfo iocFile, bool bThrowIfDbFile)
+		{
+			byte[] pbFileData = IOConnection.ReadFile(iocFile);
+			Construct(pbFileData, iocFile, bThrowIfDbFile);
+		}
+		// public void Clear()
+		// {
+		//	m_strPath = string.Empty;
+		//	m_pbKeyData = null;
+		// }
+
+
+        private static byte[] LoadKeyFile(byte[] pbFileData)
+        {
+            if (pbFileData == null) throw new ArgumentNullException("pbFileData");
+
+            byte[] pbKey = LoadKeyFileXml(pbFileData);
+            if (pbKey != null) return pbKey;
+
+            int cb = pbFileData.Length;
+            if (cb == 32) return pbFileData;
+
+            if (cb == 64)
+            {
+                pbKey = LoadKeyFileHex(pbFileData);
+                if (pbKey != null) return pbKey;
+            }
+
+            return CryptoUtil.HashSha256(pbFileData);
+        }
+
+        private static byte[] LoadKeyFileXml(byte[] pbFileData)
+        {
+            KfxFile kf;
+            try
+            {
+                using (MemoryStream ms = new MemoryStream(pbFileData, false))
+                {
+                    kf = KfxFile.Load(ms);
+                }
+            }
+            catch (Exception) { return null; }
+
+            // We have a syntactically valid XML key file;
+            // failing to verify the key should throw an exception
+            return ((kf != null) ? kf.GetKey() : null);
+        }
+
+        private static byte[] LoadKeyFileHex(byte[] pbFileData)
+        {
+            if (pbFileData == null) { Debug.Assert(false); return null; }
+
+            try
+            {
+                int cc = pbFileData.Length;
+                if ((cc & 1) != 0) { Debug.Assert(false); return null; }
+
+                if (!StrUtil.IsHexString(pbFileData, true)) return null;
+
+                string strHex = StrUtil.Utf8.GetString(pbFileData);
+                return MemUtil.HexStringToByteArray(strHex);
+            }
+            catch (Exception) { Debug.Assert(false); }
+
+            return null;
+        }
+		/// <summary>
+		/// Create a new, random key-file.
+		/// </summary>
+		/// <param name="strFilePath">Path where the key-file should be saved to.
+		/// If the file exists already, it will be overwritten.</param>
+		/// <param name="pbAdditionalEntropy">Additional entropy used to generate
+		/// the random key. May be <c>null</c> (in this case only the KeePass-internal
+		/// random number generator is used).</param>
+		/// <returns>Returns a <c>FileSaveResult</c> error code.</returns>
+		public static void Create(string strFilePath, byte[] pbAdditionalEntropy)
+		{
+			byte[] pbKey32 = CryptoRandom.Instance.GetRandomBytes(32);
+			if(pbKey32 == null) throw new SecurityException();
+
+			byte[] pbFinalKey32;
+			if((pbAdditionalEntropy == null) || (pbAdditionalEntropy.Length == 0))
+				pbFinalKey32 = pbKey32;
+			else
+			{
+				using(MemoryStream ms = new MemoryStream())
+				{
+					MemUtil.Write(ms, pbAdditionalEntropy);
+					MemUtil.Write(ms, pbKey32);
+
+					pbFinalKey32 = CryptoUtil.HashSha256(ms.ToArray());
+				}
+			}
+
+			CreateXmlKeyFile(strFilePath, pbFinalKey32);
+		}
+
+		// ================================================================
+		// XML Key Files
+		// ================================================================
+
+		// Sample XML file:
+		// <?xml version="1.0" encoding="utf-8"?>
+		// <KeyFile>
+		//     <Meta>
+		//         <Version>1.00</Version>
+		//     </Meta>
+		//     <Key>
+		//         <Data>ySFoKuCcJblw8ie6RkMBdVCnAf4EedSch7ItujK6bmI=</Data>
+		//     </Key>
+		// </KeyFile>
+
+		private const string RootElementName = "KeyFile";
+		private const string MetaElementName = "Meta";
+		private const string VersionElementName = "Version";
+		private const string KeyElementName = "Key";
+		private const string KeyDataElementName = "Data";
+
+		private static byte[] LoadXmlKeyFile(byte[] pbFileData)
+		{
+			if(pbFileData == null) { Debug.Assert(false); return null; }
+
+			MemoryStream ms = new MemoryStream(pbFileData, false);
+			byte[] pbKeyData = null;
+
+			try
+			{
+				XmlDocument doc = new XmlDocument() { XmlResolver = null };
+				doc.Load(ms);
+
+				XmlElement el = doc.DocumentElement;
+				if((el == null) || !el.Name.Equals(RootElementName)) return null;
+				if(el.ChildNodes.Count < 2) return null;
+
+				foreach(XmlNode xmlChild in el.ChildNodes)
+				{
+					if(xmlChild.Name.Equals(MetaElementName)) { } // Ignore Meta
+					else if(xmlChild.Name == KeyElementName)
+					{
+						foreach(XmlNode xmlKeyChild in xmlChild.ChildNodes)
+						{
+							if(xmlKeyChild.Name == KeyDataElementName)
+							{
+								if(pbKeyData == null)
+									pbKeyData = Convert.FromBase64String(xmlKeyChild.InnerText);
+							}
+						}
+					}
+				}
+			}
+			catch(Exception) { pbKeyData = null; }
+			finally { ms.Close(); }
+
+			return pbKeyData;
+		}
+
+		private static void CreateXmlKeyFile(string strFile, byte[] pbKeyData)
+		{
+			Debug.Assert(strFile != null);
+			if(strFile == null) throw new ArgumentNullException("strFile");
+			Debug.Assert(pbKeyData != null);
+			if(pbKeyData == null) throw new ArgumentNullException("pbKeyData");
+
+			IOConnectionInfo ioc = IOConnectionInfo.FromPath(strFile);
+			Stream sOut = IOConnection.OpenWrite(ioc);
+
+#if KeePassUAP
+			XmlWriterSettings xws = new XmlWriterSettings();
+			xws.Encoding = StrUtil.Utf8;
+			xws.Indent = false;
+
+			XmlWriter xtw = XmlWriter.Create(sOut, xws);
+#else
+			XmlTextWriter xtw = new XmlTextWriter(sOut, StrUtil.Utf8);
+#endif
+
+			xtw.WriteStartDocument();
+			xtw.WriteWhitespace("\r\n");
+			xtw.WriteStartElement(RootElementName); // KeyFile
+			xtw.WriteWhitespace("\r\n\t");
+
+			xtw.WriteStartElement(MetaElementName); // Meta
+			xtw.WriteWhitespace("\r\n\t\t");
+			xtw.WriteStartElement(VersionElementName); // Version
+			xtw.WriteString("1.00");
+			xtw.WriteEndElement(); // End Version
+			xtw.WriteWhitespace("\r\n\t");
+			xtw.WriteEndElement(); // End Meta
+			xtw.WriteWhitespace("\r\n\t");
+
+			xtw.WriteStartElement(KeyElementName); // Key
+			xtw.WriteWhitespace("\r\n\t\t");
+
+			xtw.WriteStartElement(KeyDataElementName); // Data
+			xtw.WriteString(Convert.ToBase64String(pbKeyData));
+			xtw.WriteEndElement(); // End Data
+			xtw.WriteWhitespace("\r\n\t");
+
+			xtw.WriteEndElement(); // End Key
+			xtw.WriteWhitespace("\r\n");
+
+			xtw.WriteEndElement(); // RootElementName
+			xtw.WriteWhitespace("\r\n");
+			xtw.WriteEndDocument(); // End KeyFile
+			xtw.Close();
+
+			sOut.Close();
+		}
+
+		/// <summary>
+		/// Allows to change the ioc value (without reloading the data, assuming it's the same content)
+		/// </summary>
+		/// <param name="newIoc"></param>
+		public void ResetIoc(IOConnectionInfo newIoc)
+		{
+			m_ioc = newIoc;
+	}
+}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KcpPassword.cs

@@ -0,0 +1,106 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Cryptography;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Keys
+{
+	/// <summary>
+	/// Master password / passphrase as provided by the user.
+	/// </summary>
+	public sealed class KcpPassword : IUserKey
+	{
+		private ProtectedString m_psPassword;
+		private ProtectedBinary m_pbKeyData;
+
+		/// <summary>
+		/// Get the password as protected string.
+		/// </summary>
+		public ProtectedString Password
+		{
+			get { return m_psPassword; }
+		}
+
+		/// <summary>
+		/// Get key data. Querying this property is fast (it returns a
+		/// reference to a cached <c>ProtectedBinary</c> object).
+		/// If no key data is available, <c>null</c> is returned.
+		/// </summary>
+		public ProtectedBinary KeyData
+		{
+			get { return m_pbKeyData; }
+		}
+
+	    public uint GetMinKdbxVersion()
+	    {
+	        return 0;
+	    }
+
+	    public KcpPassword(byte[] pbPasswordUtf8)
+		{
+			SetKey(pbPasswordUtf8);
+		}
+
+		public KcpPassword(string strPassword)
+		{
+			SetKey(StrUtil.Utf8.GetBytes(strPassword));
+		}
+
+		private void SetKey(byte[] pbPasswordUtf8)
+		{
+			Debug.Assert(pbPasswordUtf8 != null);
+			if(pbPasswordUtf8 == null) throw new ArgumentNullException("pbPasswordUtf8");
+
+#if (DEBUG && !KeePassLibSD)
+			Debug.Assert(ValidatePassword(pbPasswordUtf8));
+#endif
+
+			byte[] pbRaw = CryptoUtil.HashSha256(pbPasswordUtf8);
+
+			m_psPassword = new ProtectedString(true, pbPasswordUtf8);
+			m_pbKeyData = new ProtectedBinary(true, pbRaw);
+		}
+
+		// public void Clear()
+		// {
+		//	m_psPassword = null;
+		//	m_pbKeyData = null;
+		// }
+
+#if (DEBUG && !KeePassLibSD)
+		private static bool ValidatePassword(byte[] pb)
+		{
+			try
+			{
+				string str = StrUtil.Utf8.GetString(pb);
+				return str.IsNormalized(NormalizationForm.FormC);
+	}
+			catch(Exception) { Debug.Assert(false); }
+
+			return false;
+}
+#endif
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KcpUserAccount.cs

@@ -0,0 +1,115 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2016 Dominik Reichl <dominik.reichl@t-online.de>
+  
+  Modified to be used with Mono for Android. Changes Copyright (C) 2013 Philipp Crocoll
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Diagnostics;
+using System.Security;
+
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Cryptography;
+using KeePassLib.Resources;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+
+namespace KeePassLib.Keys
+{
+	/// <summary>
+	/// A user key depending on the currently logged on Windows user account.
+	/// </summary>
+	public sealed class KcpUserAccount : IUserKey
+	{
+		private ProtectedBinary m_pbKeyData = null;
+
+		// Constant initialization vector (unique for KeePass)
+		private static readonly byte[] m_pbEntropy = new byte[]{
+			0xDE, 0x13, 0x5B, 0x5F, 0x18, 0xA3, 0x46, 0x70,
+			0xB2, 0x57, 0x24, 0x29, 0x69, 0x88, 0x98, 0xE6
+		};
+
+		private const string UserKeyFileName = "ProtectedUserKey.bin";
+
+		/// <summary>
+		/// Get key data. Querying this property is fast (it returns a
+		/// reference to a cached <c>ProtectedBinary</c> object).
+		/// If no key data is available, <c>null</c> is returned.
+		/// </summary>
+		public ProtectedBinary KeyData
+		{
+			get { return m_pbKeyData; }
+		}
+
+	    public uint GetMinKdbxVersion()
+	    {
+	        return 0;
+	    }
+
+	    /// <summary>
+		/// Construct a user account key.
+		/// </summary>
+		public KcpUserAccount()
+		{
+			throw new NotSupportedException("DataProtection not supported on MonoForAndroid!");
+		}
+
+		// public void Clear()
+		// {
+		//	m_pbKeyData = null;
+		// }
+
+	    private static byte[] LoadUserKey(bool bShowWarning)
+		{
+			byte[] pbKey = null;
+
+#if !KeePassLibSD
+			try
+			{
+				throw new NotSupportedException("DataProtection not supported on MonoForAndroid!");
+			}
+			catch (Exception exLoad)
+			{
+				if (bShowWarning) MessageService.ShowWarning(exLoad);
+
+				pbKey = null;
+			}
+#endif
+
+			return pbKey;
+		}
+
+		private static byte[] CreateUserKey()
+		{
+			byte[] pbKey = null;
+
+#if !KeePassLibSD
+			try
+			{
+				throw new NotSupportedException("DataProtection not supported on MonoForAndroid!");
+			}
+			catch (Exception) { pbKey = null; }
+#endif
+
+			return pbKey;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KeyProvider.cs

@@ -0,0 +1,152 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using KeePassLib.Serialization;
+
+namespace KeePassLib.Keys
+{
+	public sealed class KeyProviderQueryContext
+	{
+		private IOConnectionInfo m_ioInfo;
+		public IOConnectionInfo DatabaseIOInfo
+		{
+			get { return m_ioInfo; }
+		}
+
+		public string DatabasePath
+		{
+			get { return m_ioInfo.Path; }
+		}
+
+		private bool m_bCreatingNewKey;
+		public bool CreatingNewKey
+		{
+			get { return m_bCreatingNewKey; }
+		}
+
+		private bool m_bSecDesktop;
+		public bool IsOnSecureDesktop
+		{
+			get { return m_bSecDesktop; }
+		}
+
+		public KeyProviderQueryContext(IOConnectionInfo ioInfo, bool bCreatingNewKey,
+			bool bOnSecDesktop)
+		{
+			if(ioInfo == null) throw new ArgumentNullException("ioInfo");
+
+			m_ioInfo = ioInfo.CloneDeep();
+			m_bCreatingNewKey = bCreatingNewKey;
+			m_bSecDesktop = bOnSecDesktop;
+		}
+	}
+
+	public abstract class KeyProvider
+	{
+		/// <summary>
+		/// Name of your key provider (should be unique).
+		/// </summary>
+		public abstract string Name
+		{
+			get;
+		}
+
+		/// <summary>
+		/// Property indicating whether the provider is exclusive.
+		/// If the provider is exclusive, KeePass doesn't allow other
+		/// key sources (master password, Windows user account, ...)
+		/// to be combined with the provider.
+		/// Key providers typically should return <c>false</c>
+		/// (to allow non-exclusive use), i.e. don't override this
+		/// property.
+		/// </summary>
+		public virtual bool Exclusive
+		{
+			get { return false; }
+		}
+
+		/// <summary>
+		/// Property that specifies whether the returned key data
+		/// gets hashed by KeePass first or is written directly to
+		/// the user key data stream.
+		/// Standard key provider plugins should return <c>false</c>
+		/// (i.e. don't overwrite this property). Returning <c>true</c>
+		/// may cause severe security problems and is highly
+		/// discouraged.
+		/// </summary>
+		public virtual bool DirectKey
+		{
+			get { return false; }
+		}
+
+		// public virtual PwIcon ImageIndex
+		// {
+		//	get { return PwIcon.UserKey; }
+		// }
+
+		/// <summary>
+		/// This property specifies whether the <c>GetKey</c> method might
+		/// show a form or dialog. If there is any chance that the method shows
+		/// one, this property must return <c>true</c>. Only if it's guaranteed
+		/// that the <c>GetKey</c> method doesn't show any form or dialog, this
+		/// property should return <c>false</c>.
+		/// </summary>
+		public virtual bool GetKeyMightShowGui
+		{
+			get { return true; }
+		}
+
+		/// <summary>
+		/// This property specifies whether the key provider is compatible
+		/// with the secure desktop mode. This almost never is the case,
+		/// so you usually won't override this property.
+		/// </summary>
+		public virtual bool SecureDesktopCompatible
+		{
+			get { return false; }
+		}
+
+		public abstract byte[] GetKey(KeyProviderQueryContext ctx);
+	}
+
+#if DEBUG
+	public sealed class SampleKeyProvider : KeyProvider
+	{
+		public override string Name
+		{
+			get { return "Built-In Sample Key Provider"; }
+		}
+
+		// Do not just copy this to your own key provider class! See above.
+		public override bool GetKeyMightShowGui
+		{
+			get { return false; }
+		}
+
+		public override byte[] GetKey(KeyProviderQueryContext ctx)
+		{
+			return new byte[]{ 2, 3, 5, 7, 11, 13 };
+		}
+	}
+#endif
+}

src/KeePassLib2AndroidSdkStyle/Keys/KeyProviderPool.cs

@@ -0,0 +1,105 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+namespace KeePassLib.Keys
+{
+	public sealed class KeyProviderPool : IEnumerable<KeyProvider>
+	{
+		private List<KeyProvider> m_vProviders = new List<KeyProvider>();
+
+		public int Count
+		{
+			get { return m_vProviders.Count; }
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vProviders.GetEnumerator();
+		}
+
+		public IEnumerator<KeyProvider> GetEnumerator()
+		{
+			return m_vProviders.GetEnumerator();
+		}
+
+		public void Add(KeyProvider prov)
+		{
+			Debug.Assert(prov != null); if(prov == null) throw new ArgumentNullException("prov");
+
+			m_vProviders.Add(prov);
+		}
+
+		public bool Remove(KeyProvider prov)
+		{
+			Debug.Assert(prov != null); if(prov == null) throw new ArgumentNullException("prov");
+
+			return m_vProviders.Remove(prov);
+		}
+
+		public KeyProvider Get(string strProviderName)
+		{
+			if(strProviderName == null) throw new ArgumentNullException("strProviderName");
+
+			foreach(KeyProvider prov in m_vProviders)
+			{
+				if(prov.Name == strProviderName) return prov;
+			}
+
+			return null;
+		}
+
+		public bool IsKeyProvider(string strName)
+		{
+			Debug.Assert(strName != null); if(strName == null) throw new ArgumentNullException("strName");
+
+			foreach(KeyProvider prov in m_vProviders)
+			{
+				if(prov.Name == strName) return true;
+			}
+
+			return false;
+		}
+
+		internal byte[] GetKey(string strProviderName, KeyProviderQueryContext ctx,
+			out bool bPerformHash)
+		{
+			Debug.Assert(strProviderName != null); if(strProviderName == null) throw new ArgumentNullException("strProviderName");
+
+			bPerformHash = true;
+
+			foreach(KeyProvider prov in m_vProviders)
+			{
+				if(prov.Name == strProviderName)
+				{
+					bPerformHash = !prov.DirectKey;
+					return prov.GetKey(ctx);
+				}
+			}
+
+			Debug.Assert(false);
+			return null;
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KeyValidator.cs

@@ -0,0 +1,51 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace KeePassLib.Keys
+{
+	public enum KeyValidationType
+	{
+		MasterPassword = 0
+	}
+
+	public abstract class KeyValidator
+	{
+		/// <summary>
+		/// Name of your key validator (should be unique).
+		/// </summary>
+		public abstract string Name
+		{
+			get;
+		}
+
+		/// <summary>
+		/// Validate a key.
+		/// </summary>
+		/// <param name="strKey">Key to validate.</param>
+		/// <param name="t">Type of the validation to perform.</param>
+		/// <returns>Returns <c>null</c>, if the validation is successful.
+		/// If there's a problem with the key, the returned string describes
+		/// the problem.</returns>
+		public abstract string Validate(string strKey, KeyValidationType t);
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/KeyValidatorPool.cs

@@ -0,0 +1,86 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+
+using KeePassLib.Utility;
+
+namespace KeePassLib.Keys
+{
+	public sealed class KeyValidatorPool : IEnumerable<KeyValidator>
+	{
+		private List<KeyValidator> m_vValidators = new List<KeyValidator>();
+
+		public int Count
+		{
+			get { return m_vValidators.Count; }
+		}
+
+		IEnumerator IEnumerable.GetEnumerator()
+		{
+			return m_vValidators.GetEnumerator();
+		}
+
+		public IEnumerator<KeyValidator> GetEnumerator()
+		{
+			return m_vValidators.GetEnumerator();
+		}
+
+		public void Add(KeyValidator v)
+		{
+			Debug.Assert(v != null); if(v == null) throw new ArgumentNullException("v");
+
+			m_vValidators.Add(v);
+		}
+
+		public bool Remove(KeyValidator v)
+		{
+			Debug.Assert(v != null); if(v == null) throw new ArgumentNullException("v");
+
+			return m_vValidators.Remove(v);
+		}
+
+		public string Validate(string strKey, KeyValidationType t)
+		{
+			Debug.Assert(strKey != null); if(strKey == null) throw new ArgumentNullException("strKey");
+
+			foreach(KeyValidator v in m_vValidators)
+			{
+				string strResult = v.Validate(strKey, t);
+				if(strResult != null) return strResult;
+			}
+
+			return null;
+		}
+
+		public string Validate(byte[] pbKeyUtf8, KeyValidationType t)
+		{
+			Debug.Assert(pbKeyUtf8 != null); if(pbKeyUtf8 == null) throw new ArgumentNullException("pbKeyUtf8");
+
+			if(m_vValidators.Count == 0) return null;
+
+			string strKey = StrUtil.Utf8.GetString(pbKeyUtf8, 0, pbKeyUtf8.Length);
+			return Validate(strKey, t);
+		}
+	}
+}

src/KeePassLib2AndroidSdkStyle/Keys/UserKeyType.cs

@@ -0,0 +1,33 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+
+namespace KeePassLib.Keys
+{
+	[Flags]
+	public enum UserKeyType
+	{
+		None = 0,
+		Other = 1,
+		Password = 2,
+		KeyFile = 4,
+		UserAccount = 8
+	}
+}