Added custom logger for better tracability of problems

src/KeePassLib2Android/KeePassLib2Android.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -55,6 +55,7 @@
     <Reference Include="Mono.Security" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Kp2aLog.cs" />
     <Compile Include="Resources\Resource.designer.cs" />
     <Compile Include="Resources\KLRes.Generated.cs" />
     <Compile Include="Resources\KSRes.Generated.cs" />

src/KeePassLib2Android/Keys/CompositeKey.cs

@@ -28,6 +28,7 @@ using KeePassLib.Native;
 using KeePassLib.Resources;
 using KeePassLib.Security;
 using KeePassLib.Utility;
+using keepass2android;
 
 namespace KeePassLib.Keys
 {
@@ -266,7 +267,7 @@ namespace KeePassLib.Keys
 			if (NativeLib.TransformKey256(pbNewKey, pbKeySeed32, uNumRounds))
 			{
 				sw.Stop();
-				Android.Util.Log.Debug("DEBUG", "Native transform:" +sw.ElapsedMilliseconds+"ms");
+				Kp2aLog.Log("Native transform:" +sw.ElapsedMilliseconds+"ms");
 				return pbNewKey;
 			}
 
@@ -274,7 +275,7 @@ namespace KeePassLib.Keys
 			if(TransformKeyManaged(pbNewKey, pbKeySeed32, uNumRounds) == false)
 				return null;
 			sw.Stop();
-			Android.Util.Log.Debug("DEBUG", "Managed transform:" +sw.ElapsedMilliseconds+"ms");
+			Kp2aLog.Log("Managed transform:" +sw.ElapsedMilliseconds+"ms");
 
 			SHA256Managed sha256 = new SHA256Managed();
 			return sha256.ComputeHash(pbNewKey);

src/KeePassLib2Android/Kp2aLog.cs

@@ -0,0 +1,58 @@
+/*
+This file is part of Keepass2Android, Copyright 2013 Philipp Crocoll.
+
+  Keepass2Android 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.
+
+  Keepass2Android 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 Keepass2Android.  If not, see <http://www.gnu.org/licenses/>.
+  */
+
+using System;
+using System.IO;
+using Android.Preferences;
+using KeePassLib.Serialization;
+
+namespace keepass2android
+{
+	public static class Kp2aLog
+	{
+		private static bool? _logToFile;
+
+		public static void Log(string message)
+		{
+			Android.Util.Log.Debug("KP2A", message);
+			if (LogToFile)
+			{
+				using (var streamWriter = File.AppendText(LogFilename))
+				{
+					string stringToLog = DateTime.Now+":"+DateTime.Now.Millisecond+ " -- " + message;
+					streamWriter.WriteLine(stringToLog);
+				}
+			}
+
+		}
+
+		private static string LogFilename
+		{
+			get { return "/mnt/sdcard/keepass2android.log"; }
+		}
+
+		private static bool LogToFile
+		{
+			get
+			{
+				if (_logToFile == null)
+					_logToFile = File.Exists(LogFilename);
+				return (bool) _logToFile;
+			}
+		}
+	}
+}

src/KeePassLib2Android/Native/NativeLib.cs

@@ -164,7 +164,7 @@ namespace KeePassLib.Native
 
 			try
 			{
-				//Android.Util.Log.Debug("DEBUG", "4+1"+new Kp2atest.TestClass().Add1(4));
+				//Kp2aLog.Log("4+1"+new Kp2atest.TestClass().Add1(4));
 				Com.Keepassdroid.Crypto.Finalkey.NativeFinalKey key = new Com.Keepassdroid.Crypto.Finalkey.NativeFinalKey();
 
 				byte[] newKey = key.TransformMasterKey(pKey256, pBuf256, (int)uRounds);

src/KeePassLib2Android/Serialization/IOConnection.cs

@@ -34,6 +34,7 @@ using System.Net.Security;
 
 using KeePassLib.Native;
 using KeePassLib.Utility;
+using keepass2android;
 
 namespace KeePassLib.Serialization
 {
@@ -211,10 +212,10 @@ namespace KeePassLib.Serialization
 						wc.Credentials = credentialCache;
 					} catch (NotImplementedException e)
 					{ 
-						Android.Util.Log.Debug("DEBUG", e.ToString());
+						Kp2aLog.Log(e.ToString());
 					} catch (Exception e)
 					{ 
-						Android.Util.Log.Debug("DEBUG", e.ToString());
+						Kp2aLog.Log(e.ToString());
 						Debug.Assert(false); 
 					}
 				}