revert unintentional change

docs/README.md

@@ -11,10 +11,10 @@ Regular stable releases of Keepass2Android are available on [Google Play](https:
 Beta-releases can be obtained by opting in to the [Beta testing channel](https://play.google.com/apps/testing/keepass2android.keepass2android) or [Beta testing channel for Keepass2Android Offline](https://play.google.com/apps/testing/keepass2android.keepass2android_nonet).
 
 # How can I contribute?
-* Help to translate Keepass2Android into your language or improve translations at [our Crowdin page](http://crowdin.net/project/keepass2android)
+* Help to translate Keepass2Android into your language or improve translations at [our Crowdin page](https://crowdin.net/project/keepass2android)
 * Add features by [creating a plugin](How-to-create-a-plug-in_.md) or creating a pull request. You might want to contact me before you start working so I can coordinate efforts.
 * [Become a GitHub sponsor to boost 🚀 development](https://github.com/sponsors/PhilippC)
-* [Make a donation](http://philipp.crocoll.net/donate.php)
+* [Make a donation](https://philipp.crocoll.net/donate.php)
 
 # How do I learn more?
 Please see the [wiki](https://github.com/PhilippC/keepass2android/wiki/Documentation) for further information.

src/KeePassLib2Android/Cryptography/CryptoRandomStream.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -40,8 +40,8 @@ namespace KeePassLib.Cryptography
         Null = 0,
 
         /// <summary>
-		/// A variant of the ARCFour algorithm (RC4 incompatible).
-		/// </summary>
+        /// A variant of the ArcFour algorithm (RC4 incompatible).
+        /// Insecure; for backward compatibility only.
         /// </summary>
         ArcFourVariant = 1,
 
@@ -66,56 +66,60 @@ namespace KeePassLib.Cryptography
     /// </summary>
     public sealed class CryptoRandomStream : IDisposable
     {
-		private readonly CrsAlgorithm m_crsAlgorithm;
+        private readonly CrsAlgorithm m_alg;
+        private bool m_bDisposed = false;
 
-		private byte[] m_pbState = null;
+        private readonly byte[] m_pbKey = null;
+        private readonly byte[] m_pbIV = null;
+
+        private readonly ChaCha20Cipher m_chacha20 = null;
+        private readonly Salsa20Cipher m_salsa20 = null;
+
+        private readonly 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>
+        /// <param name="a">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
+
+            m_alg = a;
+
             if (a == CrsAlgorithm.ChaCha20)
             {
-				byte[] pbKey32 = new byte[32];
-				byte[] pbIV12 = new byte[12];
-		/// <paramref name="pbKey" /> parameter contains no bytes or the
+                m_pbKey = new byte[32];
+                m_pbIV = new byte[12];
+
                 using (SHA512Managed h = new SHA512Managed())
                 {
                     byte[] pbHash = h.ComputeHash(pbKey);
-					Array.Copy(pbHash, pbKey32, 32);
-					Array.Copy(pbHash, 32, pbIV12, 0, 12);
+                    Array.Copy(pbHash, m_pbKey, 32);
+                    Array.Copy(pbHash, 32, m_pbIV, 0, 12);
                     MemUtil.ZeroByteArray(pbHash);
                 }
-		/// algorithm is unknown.</exception>
-				m_chacha20 = new ChaCha20Cipher(pbKey32, pbIV12, true);
+
+                m_chacha20 = new ChaCha20Cipher(m_pbKey, m_pbIV, true);
             }
             else if (a == CrsAlgorithm.Salsa20)
             {
-				byte[] pbKey32 = CryptoUtil.HashSha256(pbKey);
-				byte[] pbIV8 = new byte[8] { 0xE8, 0x30, 0x09, 0x4B,
+                m_pbKey = CryptoUtil.HashSha256(pbKey);
+                m_pbIV = new byte[8] { 0xE8, 0x30, 0x09, 0x4B,
                     0x97, 0x20, 0x5D, 0x2A }; // Unique constant
 
-				m_salsa20 = new Salsa20Cipher(pbKey32, pbIV8);
+                m_salsa20 = new Salsa20Cipher(m_pbKey, m_pbIV);
             }
             else if (a == CrsAlgorithm.ArcFourVariant)
             {
@@ -159,17 +163,22 @@ namespace KeePassLib.Cryptography
         {
             if (disposing)
             {
-				if(m_crsAlgorithm == CrsAlgorithm.ChaCha20)
+                if (m_alg == CrsAlgorithm.ChaCha20)
                     m_chacha20.Dispose();
-				else if(m_crsAlgorithm == CrsAlgorithm.Salsa20)
+                else if (m_alg == CrsAlgorithm.Salsa20)
                     m_salsa20.Dispose();
-				else if(m_crsAlgorithm == CrsAlgorithm.ArcFourVariant)
+                else if (m_alg == CrsAlgorithm.ArcFourVariant)
                 {
                     MemUtil.ZeroByteArray(m_pbState);
                     m_i = 0;
                     m_j = 0;
                 }
                 else { Debug.Assert(false); }
+
+                if (m_pbKey != null) MemUtil.ZeroByteArray(m_pbKey);
+                if (m_pbIV != null) MemUtil.ZeroByteArray(m_pbIV);
+
+                m_bDisposed = true;
             }
         }
 
@@ -180,19 +189,20 @@ namespace KeePassLib.Cryptography
         /// <returns>Returns <paramref name="uRequestedCount" /> random bytes.</returns>
         public byte[] GetRandomBytes(uint uRequestedCount)
         {
-			if(uRequestedCount == 0) return MemUtil.EmptyByteArray;
+            if (m_bDisposed) throw new ObjectDisposedException(null);
 
+            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)
+            if (m_alg == CrsAlgorithm.ChaCha20)
                 m_chacha20.Encrypt(pbRet, 0, cb);
-			else if(m_crsAlgorithm == CrsAlgorithm.Salsa20)
+            else if (m_alg == CrsAlgorithm.Salsa20)
                 m_salsa20.Encrypt(pbRet, 0, cb);
-			else if(m_crsAlgorithm == CrsAlgorithm.ArcFourVariant)
+            else if (m_alg == CrsAlgorithm.ArcFourVariant)
             {
                 unchecked
                 {
@@ -221,6 +231,25 @@ namespace KeePassLib.Cryptography
             return MemUtil.BytesToUInt64(pb);
         }
 
+        internal ulong GetRandomUInt64(ulong uMaxExcl)
+        {
+            if (uMaxExcl == 0) { Debug.Assert(false); throw new ArgumentOutOfRangeException("uMaxExcl"); }
+
+            ulong uGen, uRem;
+            do
+            {
+                uGen = GetRandomUInt64();
+                uRem = uGen % uMaxExcl;
+            }
+            while ((uGen - uRem) > (ulong.MaxValue - (uMaxExcl - 1UL)));
+            // This ensures that the last number of the block (i.e.
+            // (uGen - uRem) + (uMaxExcl - 1)) is generatable;
+            // for signed longs, overflow to negative number:
+            // while((uGen - uRem) + (uMaxExcl - 1) < 0);
+
+            return uRem;
+        }
+
 #if CRSBENCHMARK
 		public static string Benchmark()
 		{
@@ -237,21 +266,20 @@ namespace KeePassLib.Cryptography
 			return str;
 		}
 
-		private static int BenchTime(CrsAlgorithm cra, int nRounds, int nDataSize)
+		private static int BenchTime(CrsAlgorithm a, int nRounds, int cbData)
 		{
 			byte[] pbKey = new byte[4] { 0x00, 0x01, 0x02, 0x03 };
 
-			int nStart = Environment.TickCount;
+			int tStart = Environment.TickCount;
 			for(int i = 0; i < nRounds; ++i)
 			{
-				using(CryptoRandomStream c = new CryptoRandomStream(cra, pbKey))
+				using(CryptoRandomStream crs = new CryptoRandomStream(a, pbKey))
 				{
-					c.GetRandomBytes((uint)nDataSize);
+					crs.GetRandomBytes((uint)cbData);
 				}
 			}
-			int nEnd = Environment.TickCount;
 
-			return (nEnd - nStart);
+			return (Environment.TickCount - tStart);
 		}
 #endif
     }

src/KeePassLib2Android/Cryptography/PasswordGenerator/CharSetBasedGenerator.cs

@@ -1,65 +0,0 @@
-/*
-  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/KeePassLib2Android/Cryptography/PasswordGenerator/PatternBasedGenerator.cs

@@ -1,173 +0,0 @@
-/*
-  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/KeePassLib2Android/Cryptography/PasswordGenerator/PwCharSet.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -19,122 +19,81 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 using System.Diagnostics;
+using System.Text;
+
+using KeePassLib.Utility;
 
 namespace KeePassLib.Cryptography.PasswordGenerator
 {
-	public sealed class PwCharSet
+    public sealed class PwCharSet : IEquatable<PwCharSet>
     {
-		public const string UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
-		public const string LowerCase = "abcdefghijklmnopqrstuvwxyz";
-		public const string Digits = "0123456789";
+        public static readonly string UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        public static readonly string LowerCase = "abcdefghijklmnopqrstuvwxyz";
+        public static readonly string Digits = "0123456789";
 
-		public const string UpperConsonants = "BCDFGHJKLMNPQRSTVWXYZ";
-		public const string LowerConsonants = "bcdfghjklmnpqrstvwxyz";
-		public const string UpperVowels = "AEIOU";
-		public const string LowerVowels = "aeiou";
+        public static readonly string UpperConsonants = "BCDFGHJKLMNPQRSTVWXYZ";
+        public static readonly string LowerConsonants = "bcdfghjklmnpqrstvwxyz";
+        public static readonly string UpperVowels = "AEIOU";
+        public static readonly string LowerVowels = "aeiou";
 
-		public const string Punctuation = @",.;:";
-		public const string Brackets = @"[]{}()<>";
+        public static readonly string Punctuation = ",.;:";
+        public static readonly string Brackets = @"[]{}()<>";
 
-		public const string PrintableAsciiSpecial = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
+        public static readonly string Special = "!\"#$%&'*+,./:;=?@\\^`|~";
+        public static readonly string PrintableAsciiSpecial = "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~";
 
-		public const string UpperHex = "0123456789ABCDEF";
-		public const string LowerHex = "0123456789abcdef";
+        public static readonly string UpperHex = "0123456789ABCDEF";
+        public static readonly 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;
-			}
-		}
+        public static readonly string LookAlike = "O0Il1|";
 
         /// <summary>
-		/// Create a new, empty character set collection object.
+        /// Latin-1 Supplement except U+00A0 (NBSP) and U+00AD (SHY).
+        /// </summary>
+        public static readonly string Latin1S =
+            "\u00A1\u00A2\u00A3\u00A4\u00A5\u00A6\u00A7" +
+            "\u00A8\u00A9\u00AA\u00AB\u00AC\u00AE\u00AF" +
+            "\u00B0\u00B1\u00B2\u00B3\u00B4\u00B5\u00B6\u00B7" +
+            "\u00B8\u00B9\u00BA\u00BB\u00BC\u00BD\u00BE\u00BF" +
+            "\u00C0\u00C1\u00C2\u00C3\u00C4\u00C5\u00C6\u00C7" +
+            "\u00C8\u00C9\u00CA\u00CB\u00CC\u00CD\u00CE\u00CF" +
+            "\u00D0\u00D1\u00D2\u00D3\u00D4\u00D5\u00D6\u00D7" +
+            "\u00D8\u00D9\u00DA\u00DB\u00DC\u00DD\u00DE\u00DF" +
+            "\u00E0\u00E1\u00E2\u00E3\u00E4\u00E5\u00E6\u00E7" +
+            "\u00E8\u00E9\u00EA\u00EB\u00EC\u00ED\u00EE\u00EF" +
+            "\u00F0\u00F1\u00F2\u00F3\u00F4\u00F5\u00F6\u00F7" +
+            "\u00F8\u00F9\u00FA\u00FB\u00FC\u00FD\u00FE\u00FF";
+
+        // internal static readonly string MenuAccels = PwCharSet.LowerCase + PwCharSet.Digits;
+
+        [Obsolete]
+        public static string SpecialChars { get { return PwCharSet.Special; } }
+        [Obsolete]
+        public static string HighAnsiChars { get { return PwCharSet.Latin1S; } }
+
+        private readonly List<char> m_lChars = new List<char>();
+        private readonly byte[] m_vTab = new byte[0x10000 / 8];
+
+        /// <summary>
+        /// Create a new, empty character set.
         /// </summary>
         public PwCharSet()
         {
-			Initialize(true);
+            Debug.Assert(PwCharSet.Latin1S.Length == (16 * 6 - 2));
         }
 
         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; }
+            get { return (uint)m_lChars.Count; }
         }
 
         /// <summary>
@@ -147,19 +106,39 @@ namespace KeePassLib.Cryptography.PasswordGenerator
         {
             get
             {
-				if(uPos >= (uint)m_vChars.Count)
+                if (uPos >= (uint)m_lChars.Count)
                     throw new ArgumentOutOfRangeException("uPos");
 
-				return m_vChars[(int)uPos];
+                return m_lChars[(int)uPos];
             }
         }
 
+        public bool Equals(PwCharSet other)
+        {
+            if (object.ReferenceEquals(other, this)) return true;
+            if (object.ReferenceEquals(other, null)) return false;
+
+            if (m_lChars.Count != other.m_lChars.Count) return false;
+
+            return MemUtil.ArraysEqual(m_vTab, other.m_vTab);
+        }
+
+        public override bool Equals(object obj)
+        {
+            return Equals(obj as PwCharSet);
+        }
+
+        public override int GetHashCode()
+        {
+            return (int)MemUtil.Hash32(m_vTab, 0, m_vTab.Length);
+        }
+
         /// <summary>
         /// Remove all characters from this set.
         /// </summary>
         public void Clear()
         {
-			m_vChars.Clear();
+            m_lChars.Clear();
             Array.Clear(m_vTab, 0, m_vTab.Length);
         }
 
@@ -191,7 +170,7 @@ namespace KeePassLib.Cryptography.PasswordGenerator
 
             if (!Contains(ch))
             {
-				m_vChars.Add(ch);
+                m_lChars.Add(ch);
                 m_vTab[ch / 8] |= (byte)(1 << (ch % 8));
             }
         }
@@ -205,8 +184,6 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             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);
         }
@@ -226,8 +203,6 @@ namespace KeePassLib.Cryptography.PasswordGenerator
 
         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);
 
@@ -241,11 +216,13 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             switch (chCharSetIdentifier)
             {
                 case 'a': Add(PwCharSet.LowerCase, PwCharSet.Digits); break;
-				case 'A': Add(PwCharSet.LowerCase, PwCharSet.UpperCase,
+                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,
+                case 'C':
+                    Add(PwCharSet.LowerConsonants,
                     PwCharSet.UpperConsonants); break;
                 case 'z': Add(PwCharSet.UpperConsonants); break;
                 case 'd': Add(PwCharSet.Digits); break; // Digit
@@ -257,12 +234,13 @@ namespace KeePassLib.Cryptography.PasswordGenerator
                 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);
+                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;
+                case 'x': Add(PwCharSet.Latin1S); break;
                 default: bResult = false; break;
             }
 
@@ -272,7 +250,7 @@ namespace KeePassLib.Cryptography.PasswordGenerator
         public bool Remove(char ch)
         {
             m_vTab[ch / 8] &= (byte)(~(1 << (ch % 8)));
-			return m_vChars.Remove(ch);
+            return m_lChars.Remove(ch);
         }
 
         public bool Remove(string strCharacters)
@@ -306,8 +284,8 @@ namespace KeePassLib.Cryptography.PasswordGenerator
         /// <returns>String containing all character set characters.</returns>
         public override string ToString()
         {
-			StringBuilder sb = new StringBuilder();
-			foreach(char ch in m_vChars)
+            StringBuilder sb = new StringBuilder(m_lChars.Count);
+            foreach (char ch in m_lChars)
                 sb.Append(ch);
 
             return sb.ToString();
@@ -320,13 +298,13 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             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.Special) ? 'S' : '_');
             sb.Append(RemoveIfAllExist(PwCharSet.Punctuation) ? 'P' : '_');
-			sb.Append(RemoveIfAllExist(@"-") ? 'm' : '_');
-			sb.Append(RemoveIfAllExist(@"_") ? 'u' : '_');
-			sb.Append(RemoveIfAllExist(@" ") ? 's' : '_');
+            sb.Append(RemoveIfAllExist("-") ? 'm' : '_');
+            sb.Append(RemoveIfAllExist("_") ? 'u' : '_');
+            sb.Append(RemoveIfAllExist(" ") ? 's' : '_');
             sb.Append(RemoveIfAllExist(PwCharSet.Brackets) ? 'B' : '_');
-			sb.Append(RemoveIfAllExist(m_strHighAnsi) ? 'H' : '_');
+            sb.Append(RemoveIfAllExist(PwCharSet.Latin1S) ? 'H' : '_');
 
             return sb.ToString();
         }
@@ -339,13 +317,13 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             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[3] != '_') Add(PwCharSet.Special);
             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);
+            if (strRanges[9] != '_') Add(PwCharSet.Latin1S);
         }
     }
 }

src/KeePassLib2Android/Cryptography/PasswordGenerator/PwGenerator.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2016 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -20,9 +20,13 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Security.Cryptography;
 using System.Text;
 
+#if !KeePassUAP
+using System.Security.Cryptography;
+#endif
+
+using KeePassLib.Resources;
 using KeePassLib.Security;
 using KeePassLib.Utility;
 
@@ -33,95 +37,78 @@ namespace KeePassLib.Cryptography.PasswordGenerator
         Success = 0,
         Unknown = 1,
         TooFewCharacters = 2,
-		UnknownAlgorithm = 3
+        UnknownAlgorithm = 3,
+        InvalidCharSet = 4,
+        InvalidPattern = 5
     }
 
     /// <summary>
-	/// Utility functions for generating random passwords.
+    /// Password generator.
     /// </summary>
     public static class PwGenerator
     {
-		public static PwgError Generate(out ProtectedString psOut,
-			PwProfile pwProfile, byte[] pbUserEntropy,
-			CustomPwGeneratorPool pwAlgorithmPool)
+
+        private static CryptoRandomStream CreateRandomStream(byte[] pbAdditionalEntropy,
+            out byte[] pbKey)
         {
-			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);
+            pbKey = CryptoRandom.Instance.GetRandomBytes(128);
 
             // Mix in additional entropy
             Debug.Assert(pbKey.Length >= 64);
-			if ((pbAdditionalEntropy != null) && (pbAdditionalEntropy.Length > 0))
+            if ((pbAdditionalEntropy != null) && (pbAdditionalEntropy.Length != 0))
             {
                 using (SHA512Managed h = new SHA512Managed())
                 {
                     byte[] pbHash = h.ComputeHash(pbAdditionalEntropy);
                     MemUtil.XorArray(pbHash, 0, pbKey, 0, pbHash.Length);
+                    MemUtil.ZeroByteArray(pbHash);
                 }
             }
 
             return new CryptoRandomStream(CrsAlgorithm.ChaCha20, pbKey);
         }
 
-		internal static char GenerateCharacter(PwProfile pwProfile,
-			PwCharSet pwCharSet, CryptoRandomStream crsRandomSource)
+        internal static char GenerateCharacter(PwCharSet pwCharSet,
+            CryptoRandomStream crsRandomSource)
         {
-			if (pwCharSet.Size == 0) return char.MinValue;
+            uint cc = pwCharSet.Size;
+            if (cc == 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;
+            uint i = (uint)crsRandomSource.GetRandomUInt64(cc);
+            return pwCharSet[i];
         }
 
-		internal static void PrepareCharSet(PwCharSet pwCharSet, PwProfile pwProfile)
+        internal static bool PrepareCharSet(PwCharSet pwCharSet, PwProfile pwProfile)
         {
-			pwCharSet.Remove(PwCharSet.Invalid);
+            uint cc = pwCharSet.Size;
+            for (uint i = 0; i < cc; ++i)
+            {
+                char ch = pwCharSet[i];
+                if ((ch == char.MinValue) || (ch == '\t') || (ch == '\r') ||
+                    (ch == '\n') || char.IsSurrogate(ch))
+                    return false;
+            }
 
             if (pwProfile.ExcludeLookAlike) pwCharSet.Remove(PwCharSet.LookAlike);
 
-			if (pwProfile.ExcludeCharacters.Length > 0)
+            if (!string.IsNullOrEmpty(pwProfile.ExcludeCharacters))
                 pwCharSet.Remove(pwProfile.ExcludeCharacters);
+
+            return true;
         }
 
-		internal static void ShufflePassword(char[] pPassword,
-			CryptoRandomStream crsRandomSource)
+        internal static void Shuffle(char[] v, CryptoRandomStream crsRandomSource)
         {
-			Debug.Assert(pPassword != null); if (pPassword == null) return;
-			Debug.Assert(crsRandomSource != null); if (crsRandomSource == null) return;
+            if (v == null) { Debug.Assert(false); return; }
+            if (crsRandomSource == null) { Debug.Assert(false); return; }
 
-			if (pPassword.Length <= 1) return; // Nothing to shuffle
-
-			for (int nSelect = 0; nSelect < pPassword.Length; ++nSelect)
+            for (int i = v.Length - 1; i >= 1; --i)
             {
-				ulong uRandomIndex = crsRandomSource.GetRandomUInt64();
-				uRandomIndex %= (ulong)(pPassword.Length - nSelect);
+                int j = (int)crsRandomSource.GetRandomUInt64((ulong)(i + 1));
 
-				char chTemp = pPassword[nSelect];
-				pPassword[nSelect] = pPassword[nSelect + (int)uRandomIndex];
-				pPassword[nSelect + (int)uRandomIndex] = chTemp;
+                char t = v[i];
+                v[i] = v[j];
+                v[j] = t;
             }
         }
 
@@ -135,7 +122,7 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             if (pwAlgorithmPool == null) return PwgError.UnknownAlgorithm;
 
             string strID = pwProfile.CustomAlgorithmUuid;
-			if (string.IsNullOrEmpty(strID)) { Debug.Assert(false); return PwgError.UnknownAlgorithm; }
+            if (string.IsNullOrEmpty(strID)) return PwgError.UnknownAlgorithm;
 
             byte[] pbUuid = Convert.FromBase64String(strID);
             PwUuid uuid = new PwUuid(pbUuid);
@@ -148,5 +135,57 @@ namespace KeePassLib.Cryptography.PasswordGenerator
             psOut = pwd;
             return PwgError.Success;
         }
+
+        internal static string ErrorToString(PwgError e, bool bHeader)
+        {
+            if (e == PwgError.Success) { Debug.Assert(false); return string.Empty; }
+            if ((e == PwgError.Unknown) && bHeader) return KLRes.PwGenFailed;
+
+            string str = KLRes.UnknownError;
+            switch (e)
+            {
+                // case PwgError.Success:
+                //	break;
+
+                case PwgError.Unknown:
+                    break;
+
+                case PwgError.TooFewCharacters:
+                    str = KLRes.CharSetTooFewChars;
+                    break;
+
+                case PwgError.UnknownAlgorithm:
+                    str = KLRes.AlgorithmUnknown;
+                    break;
+
+                case PwgError.InvalidCharSet:
+                    str = KLRes.CharSetInvalid;
+                    break;
+
+                case PwgError.InvalidPattern:
+                    str = KLRes.PatternInvalid;
+                    break;
+
+                default:
+                    Debug.Assert(false);
+                    break;
+            }
+
+            if (bHeader)
+                str = KLRes.PwGenFailed + MessageService.NewParagraph + str;
+
+            return str;
+        }
+
+        internal static string ErrorToString(Exception ex, bool bHeader)
+        {
+            string str = ((ex == null) ? KLRes.UnknownError :
+                StrUtil.FormatException(ex));
+
+            if (bHeader)
+                str = KLRes.PwGenFailed + MessageService.NewParagraph + str;
+
+            return str;
+        }
     }
 }

src/KeePassLib2Android/Cryptography/PopularPasswords.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -19,8 +19,8 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 using System.Diagnostics;
+using System.Text;
 
 using KeePassLib.Utility;
 
@@ -28,15 +28,17 @@ namespace KeePassLib.Cryptography
 {
     public static class PopularPasswords
     {
-		private static Dictionary<int, Dictionary<string, bool>> m_dicts =
-			new Dictionary<int, Dictionary<string, bool>>();
+        private static readonly Dictionary<int, Dictionary<char[], bool>> g_dicts =
+            new Dictionary<int, Dictionary<char[], bool>>();
 
         internal static int MaxLength
         {
             get
             {
+                Debug.Assert(g_dicts.Count > 0); // Should be initialized
+
                 int iMaxLen = 0;
-				foreach(int iLen in m_dicts.Keys)
+                foreach (int iLen in g_dicts.Keys)
                 {
                     if (iLen > iMaxLen) iMaxLen = iLen;
                 }
@@ -47,8 +49,8 @@ namespace KeePassLib.Cryptography
 
         internal static bool ContainsLength(int nLength)
         {
-			Dictionary<string, bool> dDummy;
-			return m_dicts.TryGetValue(nLength, out dDummy);
+            Dictionary<char[], bool> dDummy;
+            return g_dicts.TryGetValue(nLength, out dDummy);
         }
 
         public static bool IsPopularPassword(char[] vPassword)
@@ -62,28 +64,30 @@ namespace KeePassLib.Cryptography
             if (vPassword == null) throw new ArgumentNullException("vPassword");
             if (vPassword.Length == 0) { uDictSize = 0; return false; }
 
-			string str = new string(vPassword);
+#if DEBUG
+            Array.ForEach(vPassword, ch => Debug.Assert(ch == char.ToLower(ch)));
+#endif
 
-			try { return IsPopularPasswordPriv(str, out uDictSize); }
+            try { return IsPopularPasswordPriv(vPassword, out uDictSize); }
             catch (Exception) { Debug.Assert(false); }
 
             uDictSize = 0;
             return false;
         }
 
-		private static bool IsPopularPasswordPriv(string str, out ulong uDictSize)
+        private static bool IsPopularPasswordPriv(char[] vPassword, out ulong uDictSize)
         {
-			Debug.Assert(m_dicts.Count > 0); // Should be initialized with data
+            Debug.Assert(g_dicts.Count > 0); // Should be initialized with data
 
-			Dictionary<string, bool> d;
-			if(!m_dicts.TryGetValue(str.Length, out d))
+            Dictionary<char[], bool> d;
+            if (!g_dicts.TryGetValue(vPassword.Length, out d))
             {
                 uDictSize = 0;
                 return false;
             }
 
             uDictSize = (ulong)d.Count;
-			return d.ContainsKey(str);
+            return d.ContainsKey(vPassword);
         }
 
         public static void Add(byte[] pbData, bool bGZipped)
@@ -96,30 +100,27 @@ namespace KeePassLib.Cryptography
                 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)
+                for (int i = 0; i <= strData.Length; ++i)
                 {
-					char ch = strData[i];
+                    char ch = ((i == strData.Length) ? ' ' : strData[i]);
 
                     if (char.IsWhiteSpace(ch))
                     {
                         int cc = sb.Length;
                         if (cc > 0)
                         {
-							string strWord = sb.ToString();
-							Debug.Assert(strWord.Length == cc);
+                            char[] vWord = new char[cc];
+                            sb.CopyTo(0, vWord, 0, cc);
 
-							Dictionary<string, bool> d;
-							if(!m_dicts.TryGetValue(cc, out d))
+                            Dictionary<char[], bool> d;
+                            if (!g_dicts.TryGetValue(cc, out d))
                             {
-								d = new Dictionary<string, bool>();
-								m_dicts[cc] = d;
+                                d = new Dictionary<char[], bool>(MemUtil.ArrayHelperExOfChar);
+                                g_dicts[cc] = d;
                             }
 
-							d[strWord] = true;
+                            d[vWord] = true;
                             sb.Remove(0, cc);
                         }
                     }

src/KeePassLib2Android/Cryptography/QualityEstimation.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -19,8 +19,8 @@
 
 using System;
 using System.Collections.Generic;
-using System.Text;
 using System.Diagnostics;
+using System.Text;
 
 using KeePassLib.Cryptography.PasswordGenerator;
 using KeePassLib.Utility;
@@ -35,19 +35,19 @@ namespace KeePassLib.Cryptography
     {
         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';
+            internal const char LowerAlpha = 'L';
+            internal const char UpperAlpha = 'U';
+            internal const char Digit = 'D';
+            internal const char Special = 'S';
+            internal const char Latin1S = 'H';
+            internal const char Other = 'X';
 
-			public const char Dictionary = 'W';
-			public const char Repetition = 'R';
-			public const char Number = 'N';
-			public const char DiffSeq = 'C';
+            internal const char Dictionary = 'W';
+            internal const char Repetition = 'R';
+            internal const char Number = 'N';
+            internal const char DiffSeq = 'C';
 
-			public const string All = "LUDSHXWRNC";
+            internal const string All = "LUDSHXWRNC";
         }
 
         // private static class CharDistrib
@@ -125,7 +125,7 @@ namespace KeePassLib.Cryptography
         private sealed class EntropyEncoder
         {
             private readonly string m_strAlph;
-			private Dictionary<char, ulong> m_dHisto = new Dictionary<char, ulong>();
+            private readonly Dictionary<char, ulong> m_dHisto = new Dictionary<char, ulong>();
             private readonly ulong m_uBaseWeight;
             private readonly ulong m_uCharWeight;
             private readonly ulong m_uOccExclThreshold;
@@ -189,7 +189,7 @@ namespace KeePassLib.Cryptography
 
         private sealed class MultiEntropyEncoder
         {
-			private Dictionary<char, EntropyEncoder> m_dEncs =
+            private readonly Dictionary<char, EntropyEncoder> m_dEncs =
                 new Dictionary<char, EntropyEncoder>();
 
             public MultiEntropyEncoder()
@@ -281,7 +281,7 @@ namespace KeePassLib.Cryptography
             }
         }
 
-		private static object m_objSyncInit = new object();
+        private static readonly object m_objSyncInit = new object();
         private static List<QeCharType> m_lCharTypes = null;
 
         private static void EnsureInitialized()
@@ -292,25 +292,20 @@ namespace KeePassLib.Cryptography
                 {
                     string strSpecial = PwCharSet.PrintableAsciiSpecial;
                     if (strSpecial.IndexOf(' ') >= 0) { Debug.Assert(false); }
-					else strSpecial = strSpecial + " ";
+                    else strSpecial += " ";
 
                     int nSp = strSpecial.Length;
-					int nHi = PwCharSet.HighAnsiChars.Length;
+                    int nL1S = PwCharSet.Latin1S.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));
+                    m_lCharTypes = new List<QeCharType>()
+                    {
+                        new QeCharType(PatternID.LowerAlpha, PwCharSet.LowerCase, true),
+                        new QeCharType(PatternID.UpperAlpha, PwCharSet.UpperCase, true),
+                        new QeCharType(PatternID.Digit, PwCharSet.Digits, true),
+                        new QeCharType(PatternID.Special, strSpecial, false),
+                        new QeCharType(PatternID.Latin1S, PwCharSet.Latin1S, false),
+                        new QeCharType(PatternID.Other, 0x10000 - (2 * 26) - 10 - nSp - nL1S)
+                    };
                 }
             }
         }
@@ -318,30 +313,30 @@ namespace KeePassLib.Cryptography
         /// <summary>
         /// Estimate the quality of a password.
         /// </summary>
-		/// <param name="vPasswordChars">Password to check.</param>
+        /// <param name="vPassword">Password to check.</param>
         /// <returns>Estimated bit-strength of the password.</returns>
-		public static uint EstimatePasswordBits(char[] vPasswordChars)
+        public static uint EstimatePasswordBits(char[] vPassword)
         {
-			if(vPasswordChars == null) { Debug.Assert(false); return 0; }
-			if(vPasswordChars.Length == 0) return 0;
+            if (vPassword == null) { Debug.Assert(false); return 0; }
+            if (vPassword.Length == 0) return 0;
 
             EnsureInitialized();
 
-			int n = vPasswordChars.Length;
+            int n = vPassword.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]));
+                    GetCharType(vPassword[i]));
                 vPatterns[i].Add(piChar);
             }
 
-			FindRepetitions(vPasswordChars, vPatterns);
-			FindNumbers(vPasswordChars, vPatterns);
-			FindDiffSeqs(vPasswordChars, vPatterns);
-			FindPopularPasswords(vPasswordChars, vPatterns);
+            FindRepetitions(vPassword, vPatterns);
+            FindNumbers(vPassword, vPatterns);
+            FindDiffSeqs(vPassword, vPatterns);
+            FindPopularPasswords(vPassword, vPatterns);
 
             // Encoders must not be static, because the entropy estimation
             // may run concurrently in multiple threads and the encoders are
@@ -382,7 +377,7 @@ namespace KeePassLib.Cryptography
                 {
                     Debug.Assert(s.Position == n);
 
-					double dblCost = ComputePathCost(s.Path, vPasswordChars,
+                    double dblCost = ComputePathCost(s.Path, vPassword,
                         ecPattern, mcData);
                     if (dblCost < dblMinCost) dblMinCost = dblCost;
                 }
@@ -420,11 +415,12 @@ namespace KeePassLib.Cryptography
         {
             if (pbUnprotectedUtf8 == null) { Debug.Assert(false); return 0; }
 
-			char[] vChars = StrUtil.Utf8.GetChars(pbUnprotectedUtf8);
-			uint uResult = EstimatePasswordBits(vChars);
-			MemUtil.ZeroArray<char>(vChars);
+            char[] v = StrUtil.Utf8.GetChars(pbUnprotectedUtf8);
+            uint r;
+            try { r = EstimatePasswordBits(v); }
+            finally { MemUtil.ZeroArray<char>(v); }
 
-			return uResult;
+            return r;
         }
 
         private static QeCharType GetCharType(char ch)
@@ -482,7 +478,7 @@ namespace KeePassLib.Cryptography
                 vLeet[i] = char.ToLower(DecodeLeetChar(ch));
             }
 
-			char chErased = default(char);
+            char chErased = default(char); // The value that Array.Clear uses
             Debug.Assert(chErased == char.MinValue);
 
             int nMaxLen = Math.Min(n, PopularPasswords.MaxLength);
@@ -515,7 +511,12 @@ namespace KeePassLib.Cryptography
                         Debug.Assert(vLower[i] == chErased);
                     }
                 }
+
+                MemUtil.ZeroArray<char>(vSub);
             }
+
+            MemUtil.ZeroArray<char>(vLower);
+            MemUtil.ZeroArray<char>(vLeet);
         }
 
         private static bool EvalAddPopularPasswordPattern(List<QePatternInstance>[] vPatterns,
@@ -659,6 +660,8 @@ namespace KeePassLib.Cryptography
                     if (bFoundRep) ErasePart(v, x1, m, ref chErased);
                 }
             }
+
+            MemUtil.ZeroArray<char>(v);
         }
 
         private static bool PartsEqual(char[] v, int x1, int x2, int nLength)
@@ -685,23 +688,25 @@ namespace KeePassLib.Cryptography
         {
             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);
+                    AddNumberPattern(vPatterns, sb, i - sb.Length);
                     sb.Remove(0, sb.Length);
                 }
             }
-			AddNumberPattern(vPatterns, sb.ToString(), n - sb.Length);
+            AddNumberPattern(vPatterns, sb, n - sb.Length);
         }
 
         private static void AddNumberPattern(List<QePatternInstance>[] vPatterns,
-			string strNumber, int i)
+            StringBuilder sb, int i)
         {
-			if(strNumber.Length <= 2) return;
+            if (sb.Length <= 2) return;
+            string strNumber = sb.ToString();
 
             int nZeros = 0;
             for (int j = 0; j < strNumber.Length; ++j)
@@ -733,17 +738,18 @@ namespace KeePassLib.Cryptography
         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);
+            int n = vPassword.Length;
+            int d = int.MaxValue, p = 0;
 
-			for(int i = 1; i < str.Length; ++i)
+            for (int i = 1; i <= n; ++i)
             {
-				int dCur = (int)str[i] - (int)str[i - 1];
+                int dCur = ((i == n) ? int.MinValue :
+                    ((int)vPassword[i] - (int)vPassword[i - 1]));
                 if (dCur != d)
                 {
                     if ((i - p) >= 3) // At least 3 chars involved
                     {
-						QeCharType ct = GetCharType(str[p]);
+                        QeCharType ct = GetCharType(vPassword[p]);
                         double dblCost = ct.CharSize + Log2(i - p - 1);
 
                         vPatterns[p].Add(new QePatternInstance(p,

src/KeePassLib2Android/Delegates/Handlers.cs

@@ -46,4 +46,12 @@ namespace KeePassLib.Delegates
 	public delegate void VoidDelegate();
 
 	public delegate string StrPwEntryDelegate(string str, PwEntry pe);
+
+    public delegate TResult GFunc<TResult>();
+    public delegate TResult GFunc<T, TResult>(T o);
+    public delegate TResult GFunc<T1, T2, TResult>(T1 o1, T2 o2);
+    public delegate TResult GFunc<T1, T2, T3, TResult>(T1 o1, T2 o2, T3 o3);
+    public delegate TResult GFunc<T1, T2, T3, T4, TResult>(T1 o1, T2 o2, T3 o3, T4 o4);
+    public delegate TResult GFunc<T1, T2, T3, T4, T5, TResult>(T1 o1, T2 o2, T3 o3, T4 o4, T5 o5);
+    public delegate TResult GFunc<T1, T2, T3, T4, T5, T6, TResult>(T1 o1, T2 o2, T3 o3, T4 o4, T5 o5, T6 o6);
 }

src/KeePassLib2Android/Utility/MemUtil.cs

@@ -1,6 +1,6 @@
 /*
   KeePass Password Safe - The Open-Source Password Manager
-  Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
+  Copyright (C) 2003-2025 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
@@ -22,6 +22,7 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using System.Text;
 
 #if KeePassLibSD
@@ -30,81 +31,26 @@ using KeePassLibSD;
 using System.IO.Compression;
 #endif
 
+using KeePassLib.Delegates;
+
 namespace KeePassLib.Utility
 {
     /// <summary>
-	/// Contains static buffer manipulation and string conversion routines.
+    /// Buffer manipulation and conversion routines.
     /// </summary>
     public static class MemUtil
     {
         public static readonly byte[] EmptyByteArray = new byte[0];
 
-		private static readonly uint[] m_vSBox = new uint[256] {
-			0xCD2FACB3, 0xE78A7F5C, 0x6F0803FC, 0xBCF6E230,
-			0x3A321712, 0x06403DB1, 0xD2F84B95, 0xDF22A6E4,
-			0x07CE9E5B, 0x31788A0C, 0xF683F6F4, 0xEA061F49,
-			0xFA5C2ACA, 0x4B9E494E, 0xB0AB25BA, 0x767731FC,
-			0x261893A7, 0x2B09F2CE, 0x046261E4, 0x41367B4B,
-			0x18A7F225, 0x8F923C0E, 0x5EF3A325, 0x28D0435E,
-			0x84C22919, 0xED66873C, 0x8CEDE444, 0x7FC47C24,
-			0xFCFC6BA3, 0x676F928D, 0xB4147187, 0xD8FB126E,
-			0x7D798D17, 0xFF82E424, 0x1712FA5B, 0xABB09DD5,
-			0x8156BA63, 0x84E4D969, 0xC937FB9A, 0x2F1E5BFC,
-			0x178ECA11, 0x0E71CD5F, 0x52AAC6F4, 0x71EEFC8F,
-			0x7090D749, 0x21CACA31, 0x92996378, 0x0939A8A8,
-			0xE9EE1934, 0xD2718616, 0xF2500543, 0xB911873C,
-			0xD3CB3EEC, 0x2BA0DBEB, 0xB42D0A27, 0xECE67C0F,
-			0x302925F0, 0x6114F839, 0xD39E6307, 0xE28970D6,
-			0xEB982F99, 0x941B4CDF, 0xC540E550, 0x8124FC45,
-			0x98B025C7, 0xE2BF90EA, 0x4F57C976, 0xCF546FE4,
-			0x59566DC8, 0xE3F4360D, 0xF5F9D231, 0xD6180B22,
-			0xB54E088A, 0xB5DFE6A6, 0x3637A36F, 0x056E9284,
-			0xAFF8FBC5, 0x19E01648, 0x8611F043, 0xDAE44337,
-			0xF61B6A1C, 0x257ACD9E, 0xDD35F507, 0xEF05CAFA,
-			0x05EB4A83, 0xFC25CA92, 0x0A4728E6, 0x9CF150EF,
-			0xAEEF67DE, 0xA9472337, 0x57C81EFE, 0x3E5E009F,
-			0x02CB03BB, 0x2BA85674, 0xF21DC251, 0x78C34A34,
-			0xABB1F5BF, 0xB95A2FBD, 0x1FB47777, 0x9A96E8AC,
-			0x5D2D2838, 0x55AAC92A, 0x99EE324E, 0x10F6214B,
-			0x58ABDFB1, 0x2008794D, 0xBEC880F0, 0xE75E5341,
-			0x88015C34, 0x352D8FBF, 0x622B7F6C, 0xF5C59EA2,
-			0x1F759D8E, 0xADE56159, 0xCC7B4C25, 0x5B8BC48C,
-			0xB6BD15AF, 0x3C5B5110, 0xE74A7C3D, 0xEE613161,
-			0x156A1C67, 0x72C06817, 0xEA0A6F69, 0x4CECF993,
-			0xCA9D554C, 0x8E20361F, 0x42D396B9, 0x595DE578,
-			0x749D7955, 0xFD1BA5FD, 0x81FC160E, 0xDB97E28C,
-			0x7CF148F7, 0x0B0B3CF5, 0x534DE605, 0x46421066,
-			0xD4B68DD1, 0x9E479CE6, 0xAE667A9D, 0xBC082082,
-			0xB06DD6EF, 0x20F0F23F, 0xB99E1551, 0xF47A2E3A,
-			0x71DA50C6, 0x67B65779, 0x2A8CB376, 0x1EA71EEE,
-			0x29ABCD50, 0xB6EB0C6B, 0x23C10511, 0x6F3F2144,
-			0x6AF23012, 0xF696BD9E, 0xB94099D8, 0xAD5A9C81,
-			0x7A0794FA, 0x7EDF59D6, 0x1E72E574, 0x8561913C,
-			0x4E4D568F, 0xEECB9928, 0x9C124D2E, 0x0848B82C,
-			0xF1CA395F, 0x9DAF43DC, 0xF77EC323, 0x394E9B59,
-			0x7E200946, 0x8B811D68, 0x16DA3305, 0xAB8DE2C3,
-			0xE6C53B64, 0x98C2D321, 0x88A97D81, 0xA7106419,
-			0x8E52F7BF, 0x8ED262AF, 0x7CCA974E, 0xF0933241,
-			0x040DD437, 0xE143B3D4, 0x3019F56F, 0xB741521D,
-			0xF1745362, 0x4C435F9F, 0xB4214D0D, 0x0B0C348B,
-			0x5051D189, 0x4C30447E, 0x7393D722, 0x95CEDD0B,
-			0xDD994E80, 0xC3D22ED9, 0x739CD900, 0x131EB9C4,
-			0xEF1062B2, 0x4F0DE436, 0x52920073, 0x9A7F3D80,
-			0x896E7B1B, 0x2C8BBE5A, 0xBD304F8A, 0xA993E22C,
-			0x134C41A0, 0xFA989E00, 0x39CE9726, 0xFB89FCCF,
-			0xE8FBAC97, 0xD4063FFC, 0x935A2B5A, 0x44C8EE83,
-			0xCB2BC7B6, 0x02989E92, 0x75478BEA, 0x144378D0,
-			0xD853C087, 0x8897A34E, 0xDD23629D, 0xBDE2A2A2,
-			0x581D8ECC, 0x5DA8AEE8, 0xFF8AAFD0, 0xBA2BCF6E,
-			0x4BD98DAC, 0xF2EDB9E4, 0xFA2DC868, 0x47E84661,
-			0xECEB1C7D, 0x41705CA4, 0x5982E4D4, 0xEB5204A1,
-			0xD196CAFB, 0x6414804D, 0x3ABD4B46, 0x8B494C26,
-			0xB432D52B, 0x39C5356B, 0x6EC80BF7, 0x71BE5483,
-			0xCEC4A509, 0xE9411D61, 0x52F341E5, 0xD2E6197B,
-			0x4F02826C, 0xA9E48838, 0xD1F8F247, 0xE4957FB3,
-			0x586CCA99, 0x9A8B6A5B, 0x4998FBEA, 0xF762BE4C,
-			0x90DFE33C, 0x9731511E, 0x88C6A82F, 0xDD65A4D4
-		};
+        internal static readonly ArrayHelperEx<char> ArrayHelperExOfChar =
+            new ArrayHelperEx<char>();
+
+        private const MethodImplOptions MioNoOptimize =
+#if KeePassLibSD
+			MethodImplOptions.NoInlining;
+#else
+            (MethodImplOptions.NoOptimization | MethodImplOptions.NoInlining);
+#endif
 
         /// <summary>
         /// Convert a hexadecimal string to a byte array. The input string must be
@@ -143,11 +89,11 @@ namespace KeePassLib.Utility
 
                 ch = strHex[i + 1];
                 if ((ch >= '0') && (ch <= '9'))
-					bt += (byte)(ch - '0');
+                    bt |= (byte)(ch - '0');
                 else if ((ch >= 'a') && (ch <= 'f'))
-					bt += (byte)(ch - 'a' + 10);
+                    bt |= (byte)(ch - 'a' + 10);
                 else if ((ch >= 'A') && (ch <= 'F'))
-					bt += (byte)(ch - 'A' + 10);
+                    bt |= (byte)(ch - 'A' + 10);
                 else { Debug.Assert(false); }
 
                 pb[i >> 1] = bt;
@@ -246,20 +192,26 @@ namespace KeePassLib.Utility
             return l.ToArray();
         }
 
+        internal static byte[] ParseBase32(string str, bool bAutoPad)
+        {
+            if (str == null) { Debug.Assert(false); return null; }
+
+            // https://sourceforge.net/p/keepass/discussion/329220/thread/59b61fddea/
+            if (bAutoPad && ((str.Length % 8) != 0))
+                str = str.PadRight((str.Length & ~7) + 8, '=');
+
+            return ParseBase32(str);
+        }
+
         /// <summary>
         /// Set all bytes in a byte array to zero.
         /// </summary>
         /// <param name="pbArray">Input array. All bytes of this array
         /// will be set to zero.</param>
-#if KeePassLibSD
-		[MethodImpl(MethodImplOptions.NoInlining)]
-#else
-		[MethodImpl(MethodImplOptions.NoOptimization | MethodImplOptions.NoInlining)]
-#endif
+        [MethodImpl(MioNoOptimize)]
         public static void ZeroByteArray(byte[] pbArray)
         {
-			Debug.Assert(pbArray != null);
-			if(pbArray == null) throw new ArgumentNullException("pbArray");
+            if (pbArray == null) { Debug.Assert(false); return; }
 
             Array.Clear(pbArray, 0, pbArray.Length);
         }
@@ -268,18 +220,41 @@ namespace KeePassLib.Utility
         /// Set all elements of an array to the default value.
         /// </summary>
         /// <param name="v">Input array.</param>
-#if KeePassLibSD
-		[MethodImpl(MethodImplOptions.NoInlining)]
-#else
-		[MethodImpl(MethodImplOptions.NoOptimization | MethodImplOptions.NoInlining)]
-#endif
+        [MethodImpl(MioNoOptimize)]
         public static void ZeroArray<T>(T[] v)
         {
-			if(v == null) { Debug.Assert(false); throw new ArgumentNullException("v"); }
+            if (v == null) { Debug.Assert(false); return; }
 
             Array.Clear(v, 0, v.Length);
         }
 
+        private static byte[] g_pbZero = null;
+        [MethodImpl(MioNoOptimize)]
+        public static void ZeroMemory(IntPtr pb, long cb)
+        {
+            if (pb == IntPtr.Zero) { Debug.Assert(false); return; }
+            if (cb < 0) { Debug.Assert(false); return; }
+
+            byte[] pbZero = g_pbZero;
+            if (pbZero == null)
+            {
+                pbZero = new byte[4096];
+                g_pbZero = pbZero;
+            }
+
+            long cbZero = pbZero.Length;
+
+            while (cb != 0)
+            {
+                long cbBlock = Math.Min(cb, cbZero);
+
+                Marshal.Copy(pbZero, 0, pb, (int)cbBlock);
+
+                pb = AddPtr(pb, cbBlock);
+                cb -= cbBlock;
+            }
+        }
+
         /// <summary>
         /// Convert 2 bytes to a 16-bit unsigned integer (little-endian).
         /// </summary>
@@ -396,15 +371,7 @@ namespace KeePassLib.Utility
         /// </summary>
         public static byte[] UInt16ToBytes(ushort uValue)
         {
-			byte[] pb = new byte[2];
-
-			unchecked
-			{
-				pb[0] = (byte)uValue;
-				pb[1] = (byte)(uValue >> 8);
-			}
-
-			return pb;
+            return new byte[2] { (byte)uValue, (byte)(uValue >> 8) };
         }
 
         /// <summary>
@@ -412,17 +379,8 @@ namespace KeePassLib.Utility
         /// </summary>
         public static byte[] UInt32ToBytes(uint uValue)
         {
-			byte[] pb = new byte[4];
-
-			unchecked
-			{
-				pb[0] = (byte)uValue;
-				pb[1] = (byte)(uValue >> 8);
-				pb[2] = (byte)(uValue >> 16);
-				pb[3] = (byte)(uValue >> 24);
-			}
-
-			return pb;
+            return new byte[4] { (byte)uValue, (byte)(uValue >> 8),
+                (byte)(uValue >> 16), (byte)(uValue >> 24) };
         }
 
         /// <summary>
@@ -431,41 +389,27 @@ namespace KeePassLib.Utility
         public static void UInt32ToBytesEx(uint uValue, byte[] pb, int iOffset)
         {
             if (pb == null) { Debug.Assert(false); throw new ArgumentNullException("pb"); }
-			if((iOffset < 0) || ((iOffset + 3) >= pb.Length))
+            if ((iOffset < 0) || (iOffset >= (pb.Length - 3)))
             {
                 Debug.Assert(false);
                 throw new ArgumentOutOfRangeException("iOffset");
             }
 
-			unchecked
-			{
             pb[iOffset] = (byte)uValue;
             pb[iOffset + 1] = (byte)(uValue >> 8);
             pb[iOffset + 2] = (byte)(uValue >> 16);
             pb[iOffset + 3] = (byte)(uValue >> 24);
         }
-		}
 
         /// <summary>
         /// Convert a 64-bit unsigned integer to 8 bytes (little-endian).
         /// </summary>
         public static byte[] UInt64ToBytes(ulong uValue)
         {
-			byte[] pb = new byte[8];
-
-			unchecked
-			{
-				pb[0] = (byte)uValue;
-				pb[1] = (byte)(uValue >> 8);
-				pb[2] = (byte)(uValue >> 16);
-				pb[3] = (byte)(uValue >> 24);
-				pb[4] = (byte)(uValue >> 32);
-				pb[5] = (byte)(uValue >> 40);
-				pb[6] = (byte)(uValue >> 48);
-				pb[7] = (byte)(uValue >> 56);
-			}
-
-			return pb;
+            return new byte[8] { (byte)uValue, (byte)(uValue >> 8),
+                (byte)(uValue >> 16), (byte)(uValue >> 24),
+                (byte)(uValue >> 32), (byte)(uValue >> 40),
+                (byte)(uValue >> 48), (byte)(uValue >> 56) };
         }
 
         /// <summary>
@@ -474,14 +418,12 @@ namespace KeePassLib.Utility
         public static void UInt64ToBytesEx(ulong uValue, byte[] pb, int iOffset)
         {
             if (pb == null) { Debug.Assert(false); throw new ArgumentNullException("pb"); }
-			if((iOffset < 0) || ((iOffset + 7) >= pb.Length))
+            if ((iOffset < 0) || (iOffset >= (pb.Length - 7)))
             {
                 Debug.Assert(false);
                 throw new ArgumentOutOfRangeException("iOffset");
             }
 
-			unchecked
-			{
             pb[iOffset] = (byte)uValue;
             pb[iOffset + 1] = (byte)(uValue >> 8);
             pb[iOffset + 2] = (byte)(uValue >> 16);
@@ -491,18 +433,27 @@ namespace KeePassLib.Utility
             pb[iOffset + 6] = (byte)(uValue >> 48);
             pb[iOffset + 7] = (byte)(uValue >> 56);
         }
-		}
 
         public static byte[] Int32ToBytes(int iValue)
         {
             return UInt32ToBytes((uint)iValue);
         }
 
+        public static void Int32ToBytesEx(int iValue, byte[] pb, int iOffset)
+        {
+            UInt32ToBytesEx((uint)iValue, pb, iOffset);
+        }
+
         public static byte[] Int64ToBytes(long lValue)
         {
             return UInt64ToBytes((ulong)lValue);
         }
 
+        public static void Int64ToBytesEx(long lValue, byte[] pb, int iOffset)
+        {
+            UInt64ToBytesEx((ulong)lValue, pb, iOffset);
+        }
+
         public static uint RotateLeft32(uint u, int nBits)
         {
             return ((u << nBits) | (u >> (32 - nBits)));
@@ -523,14 +474,35 @@ namespace KeePassLib.Utility
             return ((u >> nBits) | (u << (64 - nBits)));
         }
 
+        private static void AddVersionComponent(ref ulong uVersion, int iValue)
+        {
+            if (iValue < 0) iValue = 0;
+            else if (iValue > 0xFFFF) { Debug.Assert(false); iValue = 0xFFFF; }
+
+            uVersion = (uVersion << 16) | (uint)iValue;
+        }
+
+        internal static ulong VersionToUInt64(Version v)
+        {
+            if (v == null) { Debug.Assert(false); return 0; }
+
+            ulong u = 0;
+            AddVersionComponent(ref u, v.Major);
+            AddVersionComponent(ref u, v.Minor);
+            AddVersionComponent(ref u, v.Build);
+            AddVersionComponent(ref u, v.Revision);
+            return u;
+        }
+
         public static bool ArraysEqual(byte[] x, byte[] y)
         {
             // Return false if one of them is null (not comparable)!
             if ((x == null) || (y == null)) { Debug.Assert(false); return false; }
 
-			if(x.Length != y.Length) return false;
+            int cb = x.Length;
+            if (cb != y.Length) return false;
 
-			for(int i = 0; i < x.Length; ++i)
+            for (int i = 0; i < cb; ++i)
             {
                 if (x[i] != y[i]) return false;
             }
@@ -556,28 +528,90 @@ namespace KeePassLib.Utility
         }
 
         /// <summary>
-		/// Fast hash that can be used e.g. for hash tables.
+        /// Fast 32-bit hash (e.g. for hash tables).
         /// The algorithm might change in the future; do not store
         /// the hashes for later use.
         /// </summary>
-		public static uint Hash32(byte[] v, int iStart, int iLength)
+        public static uint Hash32(byte[] pb, int iOffset, int cb)
         {
-			uint u = 0x326F637B;
+            const ulong hI = 0x4295DC458269ED9DUL;
+            const uint hI32 = (uint)(hI >> 32);
 
-			if(v == null) { Debug.Assert(false); return u; }
-			if(iStart < 0) { Debug.Assert(false); return u; }
-			if(iLength < 0) { Debug.Assert(false); return u; }
+            if (pb == null) { Debug.Assert(false); return hI32; }
+            if (iOffset < 0) { Debug.Assert(false); return hI32; }
+            if (cb < 0) { Debug.Assert(false); return hI32; }
 
-			int m = iStart + iLength;
-			if(m > v.Length) { Debug.Assert(false); return u; }
+            int m = iOffset + cb;
+            if ((m < 0) || (m > pb.Length)) { Debug.Assert(false); return hI32; }
 
-			for(int i = iStart; i < m; ++i)
+            int m4 = iOffset + (cb & ~3), cbR = cb & 3;
+            ulong h = hI;
+
+            for (int i = iOffset; i < m4; i += 4)
+                h = (pb[i] ^ ((ulong)pb[i + 1] << 8) ^ ((ulong)pb[i + 2] << 16) ^
+                    ((ulong)pb[i + 3] << 24) ^ h) * 0x5EA4A1E35C8ACDA3UL;
+
+            switch (cbR)
             {
-				u ^= m_vSBox[v[i]];
-				u *= 3;
+                case 1:
+                    Debug.Assert(m4 == (m - 1));
+                    h = (pb[m4] ^ h) * 0x54A1CC5970AF27BBUL;
+                    break;
+                case 2:
+                    Debug.Assert(m4 == (m - 2));
+                    h = (pb[m4] ^ ((ulong)pb[m4 + 1] << 8) ^ h) *
+                        0x6C45CB2537A4271DUL;
+                    break;
+                case 3:
+                    Debug.Assert(m4 == (m - 3));
+                    h = (pb[m4] ^ ((ulong)pb[m4 + 1] << 8) ^
+                        ((ulong)pb[m4 + 2] << 16) ^ h) * 0x59B8E8939E19695DUL;
+                    break;
+                default:
+                    Debug.Assert(m4 == m);
+                    break;
             }
 
-			return u;
+            Debug.Assert((cb != 0) || ((uint)(h >> 32) == hI32));
+            return (uint)(h >> 32);
+        }
+
+        internal static uint Hash32Ex<T>(T[] v, int iOffset, int c)
+        {
+            const ulong hI = 0x4295DC458269ED9DUL;
+            const uint hI32 = (uint)(hI >> 32);
+
+            if (v == null) { Debug.Assert(false); return hI32; }
+            if (iOffset < 0) { Debug.Assert(false); return hI32; }
+            if (c < 0) { Debug.Assert(false); return hI32; }
+
+            int m = iOffset + c;
+            if ((m < 0) || (m > v.Length)) { Debug.Assert(false); return hI32; }
+
+            ulong h = hI;
+
+            for (int i = iOffset; i < m; ++i)
+                h = (h ^ (uint)v[i].GetHashCode()) * 0x5EA4A1E35C8ACDA3UL;
+
+            Debug.Assert((c != 0) || ((uint)(h >> 32) == hI32));
+            return (uint)(h >> 32);
+        }
+
+        internal static ulong Hash64(int[] v, int iOffset, int ci)
+        {
+            ulong h = 0x4295DC458269ED9DUL;
+
+            if (v == null) { Debug.Assert(false); return h; }
+            if (iOffset < 0) { Debug.Assert(false); return h; }
+            if (ci < 0) { Debug.Assert(false); return h; }
+
+            int m = iOffset + ci;
+            if ((m < 0) || (m > v.Length)) { Debug.Assert(false); return h; }
+
+            for (int i = iOffset; i < m; ++i)
+                h = (h ^ (uint)v[i]) * 0x5EA4A1E35C8ACDA3UL;
+
+            return ((h ^ (h >> 32)) * 0x59B8E8939E19695DUL);
         }
 
         public static void CopyStream(Stream sSource, Stream sTarget)
@@ -586,20 +620,31 @@ namespace KeePassLib.Utility
             if (sSource == null) throw new ArgumentNullException("sSource");
             if (sTarget == null) throw new ArgumentNullException("sTarget");
 
-			const int nBufSize = 4096;
-			byte[] pbBuf = new byte[nBufSize];
+            const int cbBuf = 4096;
+            byte[] pbBuf = new byte[cbBuf];
 
             while (true)
             {
-				int nRead = sSource.Read(pbBuf, 0, nBufSize);
-				if(nRead == 0) break;
+                int cbRead = sSource.Read(pbBuf, 0, cbBuf);
+                if (cbRead == 0) break;
 
-				sTarget.Write(pbBuf, 0, nRead);
+                sTarget.Write(pbBuf, 0, cbRead);
             }
 
             // Do not close any of the streams
         }
 
+        public static byte[] Read(Stream s)
+        {
+            if (s == null) throw new ArgumentNullException("s");
+
+            using (MemoryStream ms = new MemoryStream())
+            {
+                CopyStream(s, ms);
+                return ms.ToArray();
+            }
+        }
+
         public static byte[] Read(Stream s, int nCount)
         {
             if (s == null) throw new ArgumentNullException("s");
@@ -626,6 +671,17 @@ namespace KeePassLib.Utility
             return pb;
         }
 
+        internal static string ReadString(Stream s, Encoding enc)
+        {
+            if (s == null) throw new ArgumentNullException("s");
+            if (enc == null) throw new ArgumentNullException("enc");
+
+            using (StreamReader sr = new StreamReader(s, enc, true))
+            {
+                return sr.ReadToEnd();
+            }
+        }
+
         public static void Write(Stream s, byte[] pbData)
         {
             if (s == null) { Debug.Assert(false); return; }
@@ -640,7 +696,6 @@ namespace KeePassLib.Utility
             if (pbData == null) throw new ArgumentNullException("pbData");
             if (pbData.Length == 0) return pbData;
 
-			byte[] pbCompressed;
             using (MemoryStream msSource = new MemoryStream(pbData, false))
             {
                 using (MemoryStream msCompressed = new MemoryStream())
@@ -648,14 +703,12 @@ namespace KeePassLib.Utility
                     using (GZipStream gz = new GZipStream(msCompressed,
                         CompressionMode.Compress))
                     {
-						MemUtil.CopyStream(msSource, gz);
+                        CopyStream(msSource, gz);
                     }
 
-					pbCompressed = msCompressed.ToArray();
+                    return msCompressed.ToArray();
                 }
             }
-
-			return pbCompressed;
         }
 
         public static byte[] Decompress(byte[] pbCompressed)
@@ -663,7 +716,6 @@ namespace KeePassLib.Utility
             if (pbCompressed == null) throw new ArgumentNullException("pbCompressed");
             if (pbCompressed.Length == 0) return pbCompressed;
 
-			byte[] pbData;
             using (MemoryStream msData = new MemoryStream())
             {
                 using (MemoryStream msCompressed = new MemoryStream(pbCompressed, false))
@@ -671,14 +723,12 @@ namespace KeePassLib.Utility
                     using (GZipStream gz = new GZipStream(msCompressed,
                         CompressionMode.Decompress))
                     {
-						MemUtil.CopyStream(gz, msData);
+                        CopyStream(gz, msData);
                     }
                 }
 
-				pbData = msData.ToArray();
+                return msData.ToArray();
             }
-
-			return pbData;
         }
 
         public static int IndexOf<T>(T[] vHaystack, T[] vNeedle)
@@ -688,10 +738,13 @@ namespace KeePassLib.Utility
             if (vNeedle == null) throw new ArgumentNullException("vNeedle");
             if (vNeedle.Length == 0) return 0;
 
-			for(int i = 0; i <= (vHaystack.Length - vNeedle.Length); ++i)
+            int cN = vNeedle.Length;
+            int iMax = vHaystack.Length - cN;
+
+            for (int i = 0; i <= iMax; ++i)
             {
                 bool bFound = true;
-				for(int m = 0; m < vNeedle.Length; ++m)
+                for (int m = 0; m < cN; ++m)
                 {
                     if (!vHaystack[i + m].Equals(vNeedle[m]))
                     {
@@ -786,6 +839,44 @@ namespace KeePassLib.Utility
 
             yield break;
         }
+
+        internal static IEnumerable<T> Distinct<T, TKey>(IEnumerable<T> s,
+            GFunc<T, TKey> fGetKey, bool bPreferLast)
+        {
+            if (s == null) throw new ArgumentNullException("s");
+            if (fGetKey == null) throw new ArgumentNullException("fGetKey");
+
+            Dictionary<TKey, bool> d = new Dictionary<TKey, bool>();
+
+            if (bPreferLast)
+            {
+                List<T> l = new List<T>(s);
+                int n = l.Count;
+                bool[] v = new bool[n];
+
+                for (int i = n - 1; i >= 0; --i)
+                {
+                    TKey k = fGetKey(l[i]);
+                    if (!d.ContainsKey(k)) { d[k] = true; v[i] = true; }
+                }
+
+                for (int i = 0; i < n; ++i)
+                {
+                    if (v[i]) yield return l[i];
+                }
+            }
+            else
+            {
+                foreach (T t in s)
+                {
+                    TKey k = fGetKey(t);
+                    if (!d.ContainsKey(k)) { d[k] = true; yield return t; }
+                }
+            }
+
+            yield break;
+        }
+
         internal static bool ListsEqual<T>(List<T> a, List<T> b)
             where T : class, IEquatable<T>
         {
@@ -809,5 +900,164 @@ namespace KeePassLib.Utility
 
             return true;
         }
+
+        internal static int Count(byte[] pb, byte bt)
+        {
+            if (pb == null) { Debug.Assert(false); return 0; }
+
+            int cb = pb.Length, r = 0;
+            for (int i = 0; i < cb; ++i)
+            {
+                if (pb[i] == bt) ++r;
+            }
+
+            return r;
+        }
+
+        [MethodImpl(MioNoOptimize)]
+        internal static void DisposeIfPossible(object o)
+        {
+            if (o == null) { Debug.Assert(false); return; }
+
+            IDisposable d = (o as IDisposable);
+            if (d != null) d.Dispose();
+        }
+
+        internal static object GetEnumValue(Type tEnum, string strName)
+        {
+            if (tEnum == null) { Debug.Assert(false); return null; }
+            if (!tEnum.IsEnum) { Debug.Assert(false); return null; }
+            if (string.IsNullOrEmpty(strName)) { Debug.Assert(false); return null; }
+
+            return ((Array.IndexOf<string>(Enum.GetNames(tEnum), strName) >= 0) ?
+                Enum.Parse(tEnum, strName) : null);
+        }
+
+        internal static T ConvertObject<T>(object o, T tDefault)
+        {
+            if (o == null) return tDefault;
+
+            try
+            {
+                if (o is T) return (T)o;
+                return (T)Convert.ChangeType(o, typeof(T));
+            }
+            catch (Exception) { Debug.Assert(false); }
+
+            try { return (T)o; }
+            catch (Exception) { Debug.Assert(false); }
+
+            return tDefault;
+        }
+
+        internal static T BytesToStruct<T>(byte[] pb, int iOffset)
+            where T : struct
+        {
+            if (pb == null) throw new ArgumentNullException("pb");
+            if (iOffset < 0) throw new ArgumentOutOfRangeException("iOffset");
+
+            int cb = Marshal.SizeOf(typeof(T));
+            if (cb <= 0) { Debug.Assert(false); return default(T); }
+
+            if (iOffset > (pb.Length - cb)) throw new ArgumentOutOfRangeException("iOffset");
+
+            IntPtr p = Marshal.AllocCoTaskMem(cb);
+            if (p == IntPtr.Zero) throw new OutOfMemoryException();
+
+            object o;
+            try
+            {
+                Marshal.Copy(pb, iOffset, p, cb);
+                o = Marshal.PtrToStructure(p, typeof(T));
+            }
+            finally { Marshal.FreeCoTaskMem(p); }
+
+            return (T)o;
+        }
+
+        internal static byte[] StructToBytes<T>(ref T t)
+            where T : struct
+        {
+            int cb = Marshal.SizeOf(typeof(T));
+            if (cb <= 0) { Debug.Assert(false); return MemUtil.EmptyByteArray; }
+
+            byte[] pb = new byte[cb];
+
+            IntPtr p = Marshal.AllocCoTaskMem(cb);
+            if (p == IntPtr.Zero) throw new OutOfMemoryException();
+
+            try
+            {
+                Marshal.StructureToPtr(t, p, false);
+                Marshal.Copy(p, pb, 0, cb);
+            }
+            finally { Marshal.FreeCoTaskMem(p); }
+
+            return pb;
+        }
+
+        internal static IntPtr AddPtr(IntPtr p, long cb)
+        {
+            // IntPtr.operator+ and IntPtr.Add are not available in .NET 2.0
+
+            if (IntPtr.Size >= 8)
+                return new IntPtr(unchecked(p.ToInt64() + cb));
+            return new IntPtr(unchecked(p.ToInt32() + (int)cb));
+        }
+
+        // Cf. Array.Empty<T>() of .NET 4.6
+        private static class EmptyArrayEx<T>
+        {
+            internal static readonly T[] Instance = new T[0];
+        }
+        internal static T[] EmptyArray<T>()
+        {
+            return EmptyArrayEx<T>.Instance;
+        }
+    }
+
+    internal sealed class ArrayHelperEx<T> : IEqualityComparer<T[]>, IComparer<T[]>
+        where T : IEquatable<T>, IComparable<T>
+    {
+        public int GetHashCode(T[] obj)
+        {
+            if (obj == null) { Debug.Assert(false); throw new ArgumentNullException("obj"); }
+
+            return (int)MemUtil.Hash32Ex<T>(obj, 0, obj.Length);
+        }
+
+        public bool Equals(T[] x, T[] y)
+        {
+            if (object.ReferenceEquals(x, y)) return true;
+            if ((x == null) || (y == null)) return false;
+
+            int n = x.Length;
+            if (n != y.Length) return false;
+
+            for (int i = 0; i < n; ++i)
+            {
+                if (!x[i].Equals(y[i])) return false;
+            }
+
+            return true;
+        }
+
+        public int Compare(T[] x, T[] y)
+        {
+            if (object.ReferenceEquals(x, y)) return 0;
+            if (x == null) return -1;
+            if (y == null) return 1;
+
+            int n = x.Length, m = y.Length;
+            if (n != m) return ((n < m) ? -1 : 1);
+
+            for (int i = 0; i < n; ++i)
+            {
+                T tX = x[i], tY = y[i];
+                if (!tX.Equals(tY)) return tX.CompareTo(tY);
+            }
+
+            return 0;
+        }
     }
 }

src/keepass2android-app/EntryActivity.cs

@@ -1546,10 +1546,10 @@ namespace keepass2android
             string url = _stringViews[urlFieldKey].Text;
 			if (url == null) return false;
 
-			// Default http:// if no protocol specified
+			// Default https:// if no protocol specified
 			if ((!url.Contains(":") || (url.StartsWith("www."))))
 			{
-				url = "http://" + url;
+				url = "https://" + url;
 			}
 
 			try

src/keepass2android-app/GeneratePasswordActivity.cs

@@ -23,6 +23,7 @@ using Android.App;
 using Android.App.Admin;
 using Android.Content;
 using Android.Content.PM;
+using Android.Content.Res;
 using Android.Graphics;
 using Android.OS;
 using Android.Preferences;
@@ -66,8 +67,13 @@ namespace keepass2android
             Resource.Id.cb_exclude_lookalike
         };
 
+        
+
 		PasswordFont _passwordFont = new PasswordFont();
 
+        private static object _popularPasswordsLock = new object();
+        private static bool _popularPasswordsInitialized = false;
+
 
         private ActivityDesign _design;
 	    public GeneratePasswordActivity()
@@ -302,6 +308,10 @@ namespace keepass2android
 
 
             EditText txtPasswordToSet = (EditText) FindViewById(Resource.Id.password_edit);
+            txtPasswordToSet.TextChanged += (sender, args) =>
+            {
+                Task.Run(() => UpdatePasswordStrengthEstimate(txtPasswordToSet.Text));
+            };
 
             _passwordFont.ApplyTo(txtPasswordToSet);
 
@@ -467,17 +477,48 @@ namespace keepass2android
                 return;
 
             String password = "";
-            uint passwordBits = 0;
+            
             
             Task.Run(() =>
             {
                 password = GeneratePassword();
-                passwordBits = QualityEstimation.EstimatePasswordBits(password.ToCharArray());
                 RunOnUiThread(() =>
                 {
                     EditText txtPassword = (EditText)FindViewById(Resource.Id.password_edit);
                     txtPassword.Text = password;
+                    UpdateProfileSpinnerSelection();
+                });
+            });
             
+        }
+
+        private void UpdatePasswordStrengthEstimate(string password)
+        {
+            lock (_popularPasswordsLock)
+            {
+                if (!_popularPasswordsInitialized)
+                {
+
+                    using (StreamReader sr = new StreamReader(Assets.Open("MostPopularPasswords.txt")))
+                    {
+                        var bytes = default(byte[]);
+                        using (var memstream = new MemoryStream())
+                        {
+                            sr.BaseStream.CopyTo(memstream);
+                            bytes = memstream.ToArray();
+                        }
+                        PopularPasswords.Add(bytes, false);
+                    }
+                }
+                    
+            }
+            uint passwordBits = QualityEstimation.EstimatePasswordBits(password.ToCharArray());
+
+
+
+
+            RunOnUiThread(() =>
+            {
                 var progressBar = FindViewById<ProgressBar>(Resource.Id.pb_password_strength);
 
                 progressBar.Progress = (int)passwordBits;
@@ -503,13 +544,7 @@ namespace keepass2android
                     PorterDuff.Mode.SrcIn));
 
                 FindViewById<TextView>(Resource.Id.tv_password_strength).Text = " " + passwordBits + " bits";
-
-
-
-                    UpdateProfileSpinnerSelection();
             });
-            });
-            
         }
 
         private void UpdateProfileSpinnerSelection()

src/keepass2android-app/PasswordActivity.cs

@@ -1423,6 +1423,8 @@ namespace keepass2android
 			if (cbQuickUnlock == null)
 				throw new NullPointerException("cpQuickUnlock");
 			App.Kp2a.SetQuickUnlockEnabled(cbQuickUnlock.Checked);
+            App.Kp2a.ScreenLockWasEnabledWhenOpeningDatabase =
+                (((KeyguardManager)GetSystemService(Context.KeyguardService)!)!).IsDeviceSecure;
 
             if ((_loadDbFileTask != null) &&  (App.Kp2a.OfflineMode != _loadDbTaskOffline))
 			{

src/keepass2android-app/QuickUnlock.cs

@@ -25,6 +25,7 @@ using Android.Widget;
 using Android.Content.PM;
 using KeePassLib.Keys;
 using Android.Preferences;
+using Android.Provider;
 using Android.Runtime;
 
 using Android.Views.InputMethods;
@@ -162,6 +163,29 @@ namespace keepass2android
             if (bundle != null)
                 numFailedAttempts = bundle.GetInt(NumFailedAttemptsKey, 0);
 
+            FindViewById(Resource.Id.QuickUnlock_buttonEnableLock).Click += (object sender, EventArgs e) =>
+            {
+				Intent intent = new Intent(Settings.ActionSecuritySettings);
+                StartActivity(intent);
+
+            };
+
+            FindViewById(Resource.Id.QuickUnlock_buttonCloseDb).Click += (object sender, EventArgs e) =>
+            {
+                App.Kp2a.Lock(false);
+            };
+
+            if (App.Kp2a.ScreenLockWasEnabledWhenOpeningDatabase == false)
+            {
+				FindViewById(Resource.Id.QuickUnlockForm).Visibility = ViewStates.Gone;
+                FindViewById(Resource.Id.QuickUnlockBlocked).Visibility = ViewStates.Visible;
+            }
+            else
+            {
+                FindViewById(Resource.Id.QuickUnlockForm).Visibility = ViewStates.Visible;
+                FindViewById(Resource.Id.QuickUnlockBlocked).Visibility = ViewStates.Gone;
+            }
+
 
 
         }

src/keepass2android-app/Resources/layout/QuickUnlock.xml

@@ -79,6 +79,12 @@ android:paddingRight="16dp"
           android:paddingTop="16dp">
 
         
+        <LinearLayout
+          android:layout_width="wrap_content"
+          android:layout_height="wrap_content"
+          android:orientation="horizontal"
+          android:id="@+id/QuickUnlockForm">
+
           <TextView
             android:id="@+id/QuickUnlock_label"
             android:text="@string/QuickUnlock_label"
@@ -88,11 +94,6 @@ android:paddingRight="16dp"
             android:textSize="14sp"
           />
 
-        <LinearLayout
-          android:layout_width="wrap_content"
-          android:layout_height="wrap_content"
-          android:orientation="horizontal">
-
           <EditText
             android:inputType="textPassword"
             android:layout_width="wrap_content"
@@ -121,6 +122,60 @@ android:paddingRight="16dp"
 
         </LinearLayout>
 
+        <LinearLayout
+          android:layout_width="match_parent"
+          android:layout_height="wrap_content"
+          android:orientation="vertical"
+          android:background="@color/md_theme_secondaryContainer"
+          android:id="@+id/QuickUnlockBlocked"
+          android:padding="16dp"
+          android:layout_gravity="center">
+
+          <TextView
+            android:id="@+id/quick_unlock_blocked_title"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/password_based_quick_unlock_not_available"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            android:gravity="center"
+            android:paddingBottom="8dp"/>
+
+          <TextView
+            android:id="@+id/alert_message"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/password_based_quick_unlock_not_available_text"
+            android:textSize="16sp"
+                            android:paddingBottom="8dp"/>
+          <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+            <Button  
+              android:id="@+id/QuickUnlock_buttonEnableLock"
+              android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:layout_gravity="center"
+              android:backgroundTint="@color/md_theme_secondary"
+              android:textColor="@android:color/white"
+              android:text="@string/enable_screen_lock"
+              android:fontFamily="sans-serif-medium"   />
+
+              <Button  
+              android:id="@+id/QuickUnlock_buttonCloseDb"
+              android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:layout_gravity="center"
+              android:backgroundTint="@color/md_theme_secondary"
+              android:textColor="@android:color/white"
+              android:fontFamily="sans-serif-medium"  
+              android:text="@string/QuickUnlock_lockButton" />
+            
+            </LinearLayout>
+            
+
+          </LinearLayout>
       
         <View
         android:id="@+id/spacing"

src/keepass2android-app/Resources/values/strings.xml

@@ -93,6 +93,8 @@
   <string name="disable_fingerprint_unlock">Disable Biometric Unlock</string>
   <string name="enable_fingerprint_unlock">Enable full Biometric Unlock</string>
   <string name="enable_fingerprint_quickunlock">Enable Biometric Unlock for QuickUnlock</string>
+  <string name="password_based_quick_unlock_not_available">Password-based QuickUnlock not available</string>
+  <string name="password_based_quick_unlock_not_available_text">QuickUnlock using a part of your password is blocked because screen lock is not activated on your device. This behavior is to protect you in case somebody watched you entering your QuickUnlock key.</string>
   <string name="fingerprint_unlock_failed">Biometric Unlock failed. Decryption key was invalidated by Android OS. This usually happens if a biometric authentication or security settings were changed. </string>
   <string name="fingerprint_disabled_wrong_masterkey">Unlocking the database failed: Invalid composite key. Biometric Unlock was disabled because apparently the stored master password is no longer valid. </string>
   <string name="fingerprint_reenable">Please re-enable Biometric Unlock for the new master password.</string>
@@ -319,6 +321,7 @@
   <string name="QuickUnlock_label_secure">Enter QuickUnlock code:</string>
   <string name="QuickUnlock_button">QuickUnlock!</string>
   <string name="QuickUnlock_lockButton">Close database</string>
+  <string name="enable_screen_lock">Enable screen lock</string>
   <string name="QuickUnlockDefaultEnabled_title">Enable QuickUnlock by default</string>
   <string name="QuickUnlockDefaultEnabled_summary">Defines whether QuickUnlock is enabled by default or not.</string>
   <string name="ViewDatabaseSecure_title">Protect database display</string>

src/keepass2android-app/Resources/xml/network_security_config.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <network-security-config>
-  <base-config cleartextTrafficPermitted="true">
+  <base-config>
     <trust-anchors>
       <certificates src="system" />
       <certificates src="user" />

src/keepass2android-app/app/App.cs

@@ -351,6 +351,9 @@ namespace keepass2android
 			QuickUnlockEnabled = enabled;
 		}
 
+		public bool ScreenLockWasEnabledWhenOpeningDatabase { get; set; }
+
+
         public bool QuickUnlockEnabled { get; private set; }
 
 		public int QuickUnlockKeyLength { get; private set; }