Setup solution

2025-10-03 15:40:20 -04:00 · 2019-07-25 16:39:43 +02:00
parent 81509be167
commit 1b2007e6dd
136 changed files with 35834 additions and 0 deletions
--- a/ModernKeePassLib/Cryptography/Cipher/CtrBlockCipher.cs
+++ b/ModernKeePassLib/Cryptography/Cipher/CtrBlockCipher.cs
@@ -0,0 +1,109 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2019 Dominik Reichl <dominik.reichl@t-online.de>
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Text;
+
+using ModernKeePassLib.Utility;
+
+namespace ModernKeePassLib.Cryptography.Cipher
+{
+	public abstract class CtrBlockCipher : IDisposable
+	{
+		private bool m_bDisposed = false;
+
+		private byte[] m_pBlock;
+		private int m_iBlockPos;
+
+		public abstract int BlockSize
+		{
+			get;
+		}
+
+		public CtrBlockCipher()
+		{
+			int cb = this.BlockSize;
+			if(cb <= 0) throw new InvalidOperationException("this.BlockSize");
+
+			m_pBlock = new byte[cb];
+			m_iBlockPos = cb;
+		}
+
+		public void Dispose()
+		{
+			Dispose(true);
+			GC.SuppressFinalize(this);
+		}
+
+		protected virtual void Dispose(bool bDisposing)
+		{
+			if(bDisposing)
+			{
+				MemUtil.ZeroByteArray(m_pBlock);
+				m_iBlockPos = m_pBlock.Length;
+
+				m_bDisposed = true;
+			}
+		}
+
+		protected void InvalidateBlock()
+		{
+			m_iBlockPos = m_pBlock.Length;
+		}
+
+		protected abstract void NextBlock(byte[] pBlock);
+
+		public void Encrypt(byte[] m, int iOffset, int cb)
+		{
+			if(m_bDisposed) throw new ObjectDisposedException(null);
+			if(m == null) throw new ArgumentNullException("m");
+			if(iOffset < 0) throw new ArgumentOutOfRangeException("iOffset");
+			if(cb < 0) throw new ArgumentOutOfRangeException("cb");
+			if(iOffset > (m.Length - cb)) throw new ArgumentOutOfRangeException("cb");
+
+			int cbBlock = m_pBlock.Length;
+
+			while(cb > 0)
+			{
+				Debug.Assert(m_iBlockPos <= cbBlock);
+				if(m_iBlockPos == cbBlock)
+				{
+					NextBlock(m_pBlock);
+					m_iBlockPos = 0;
+				}
+
+				int cbCopy = Math.Min(cbBlock - m_iBlockPos, cb);
+				Debug.Assert(cbCopy > 0);
+
+				MemUtil.XorArray(m_pBlock, m_iBlockPos, m, iOffset, cbCopy);
+
+				m_iBlockPos += cbCopy;
+				iOffset += cbCopy;
+				cb -= cbCopy;
+			}
+		}
+
+		public void Decrypt(byte[] m, int iOffset, int cb)
+		{
+			Encrypt(m, iOffset, cb);
+		}
+	}
+}