Use native Argon2 implementation

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "src/netftpandroid"]
 	path = src/netftpandroid
 	url = https://github.com/PhilippC/netftpandroid.git
+[submodule "src/java/argon2/phc-winner-argon2"]
+	path = src/java/argon2/phc-winner-argon2
+	url = https://github.com/P-H-C/phc-winner-argon2

src/KeePassLib2Android/Cryptography/KeyDerivation/Argon2Kdf.cs

@@ -20,6 +20,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Runtime.InteropServices;
 using System.Text;
 
 namespace KeePassLib.Cryptography.KeyDerivation
@@ -127,8 +128,44 @@ namespace KeePassLib.Cryptography.KeyDerivation
 			byte[] pbSecretKey = p.GetByteArray(ParamSecretKey);
 			byte[] pbAssocData = p.GetByteArray(ParamAssocData);
 
+			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);
+			}
+
+			byte[] 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;
@@ -143,5 +180,14 @@ namespace KeePassLib.Cryptography.KeyDerivation
 				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/build-scripts/build-all.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 set -e
 
+echo '*****************************************'
+echo '******* Building native libraries *******'
+echo '*****************************************'
+./build-native.sh
+
 echo '*****************************************'
 echo '********** Building Java parts **********'
 echo '*****************************************'

src/build-scripts/build-native.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+pushd ../java/argon2
+ndk-build
+popd

src/java/argon2/.gitignore

@@ -0,0 +1 @@
+/libs/

src/java/argon2/jni/Android.mk

@@ -0,0 +1,18 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := argon2
+
+LOCAL_SRC_FILES := \
+	../phc-winner-argon2/src/argon2.c \
+	../phc-winner-argon2/src/core.c \
+	../phc-winner-argon2/src/blake2/blake2b.c \
+	../phc-winner-argon2/src/thread.c \
+	../phc-winner-argon2/src/encoding.c \
+	../phc-winner-argon2/src/ref.c
+
+LOCAL_CFLAGS += -I $(LOCAL_PATH)/../phc-winner-argon2/include
+
+include $(BUILD_SHARED_LIBRARY)
+

src/java/argon2/jni/Application.mk

@@ -0,0 +1,3 @@
+APP_OPTIM        := release
+APP_ABI          := armeabi-v7a arm64-v8a x86 x86_64
+APP_PLATFORM     := android-16

src/keepass2android/keepass2android.csproj

@@ -1920,6 +1920,12 @@
   <ItemGroup>
     <AndroidAsset Include="Assets\publicsuffix.txt" />
   </ItemGroup>
+  <ItemGroup>
+    <AndroidNativeLibrary Include="..\java\argon2\libs\armeabi-v7a\libargon2.so" />
+    <AndroidNativeLibrary Include="..\java\argon2\libs\arm64-v8a\libargon2.so" />
+    <AndroidNativeLibrary Include="..\java\argon2\libs\x86\libargon2.so" />
+    <AndroidNativeLibrary Include="..\java\argon2\libs\x86_64\libargon2.so" />
+  </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
   <Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
   <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">