357 lines
8.8 KiB
C#
357 lines
8.8 KiB
C#
/*
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KeePass Password Safe - The Open-Source Password Manager
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Copyright (C) 2003-2012 Dominik Reichl <dominik.reichl@t-online.de>
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Modified to be used with Mono for Android. Changes Copyright (C) 2013 Philipp Crocoll
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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using System;
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using System.IO;
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using System.Security.Cryptography;
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using System.Diagnostics;
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using System.Text;
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using KeePassLib.Native;
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using KeePassLib.Utility;
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#if KeePassLibSD
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using KeePassLibSD;
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#endif
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namespace KeePassLib.Serialization
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{
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[System.Serializable]
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public class InvalidDataException: Exception
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="T:InvalidDataExceptionException"/> class
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/// </summary>
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public InvalidDataException ()
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="T:InvalidDataExceptionException"/> class
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/// </summary>
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/// <param name="message">A <see cref="T:System.String"/> that describes the exception. </param>
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public InvalidDataException (string message) : base (message)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="T:InvalidDataExceptionException"/> class
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/// </summary>
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/// <param name="message">A <see cref="T:System.String"/> that describes the exception. </param>
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/// <param name="inner">The exception that is the cause of the current exception. </param>
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public InvalidDataException (string message, Exception inner) : base (message, inner)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="T:InvalidDataExceptionException"/> class
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/// </summary>
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/// <param name="context">The contextual information about the source or destination.</param>
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/// <param name="info">The object that holds the serialized object data.</param>
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protected InvalidDataException (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context) : base (info, context)
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{
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}
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}
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public sealed class HashedBlockStream : Stream
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{
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private const int m_nDefaultBufferSize = 1024 * 1024; // 1 MB
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private Stream m_sBaseStream;
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private bool m_bWriting;
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private bool m_bVerify;
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private bool m_bEos = false;
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private BinaryReader m_brInput;
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private BinaryWriter m_bwOutput;
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private byte[] m_pbBuffer;
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private int m_nBufferPos = 0;
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private uint m_uBufferIndex = 0;
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public override bool CanRead
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{
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get { return !m_bWriting; }
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}
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public override bool CanSeek
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{
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get { return false; }
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}
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public override bool CanWrite
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{
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get { return m_bWriting; }
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}
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public override long Length
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{
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get { throw new NotSupportedException(); }
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}
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public override long Position
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{
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get { throw new NotSupportedException(); }
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set { throw new NotSupportedException(); }
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}
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public HashedBlockStream(Stream sBaseStream, bool bWriting)
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{
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Initialize(sBaseStream, bWriting, 0, true);
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}
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public HashedBlockStream(Stream sBaseStream, bool bWriting, int nBufferSize)
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{
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Initialize(sBaseStream, bWriting, nBufferSize, true);
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}
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public HashedBlockStream(Stream sBaseStream, bool bWriting, int nBufferSize,
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bool bVerify)
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{
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Initialize(sBaseStream, bWriting, nBufferSize, bVerify);
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}
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private void Initialize(Stream sBaseStream, bool bWriting, int nBufferSize,
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bool bVerify)
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{
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if(sBaseStream == null) throw new ArgumentNullException("sBaseStream");
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if(nBufferSize < 0) throw new ArgumentOutOfRangeException("nBufferSize");
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if(nBufferSize == 0) nBufferSize = m_nDefaultBufferSize;
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m_sBaseStream = sBaseStream;
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m_bWriting = bWriting;
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m_bVerify = bVerify;
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UTF8Encoding utf8 = StrUtil.Utf8;
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if(m_bWriting == false) // Reading mode
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{
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if(m_sBaseStream.CanRead == false)
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throw new InvalidOperationException();
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m_brInput = new BinaryReader(sBaseStream, utf8);
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m_pbBuffer = new byte[0];
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}
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else // Writing mode
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{
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if(m_sBaseStream.CanWrite == false)
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throw new InvalidOperationException();
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m_bwOutput = new BinaryWriter(sBaseStream, utf8);
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m_pbBuffer = new byte[nBufferSize];
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}
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}
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public override void Flush()
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{
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if(m_bWriting) m_bwOutput.Flush();
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}
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public override void Close()
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{
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if(m_sBaseStream != null)
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{
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if(m_bWriting == false) // Reading mode
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{
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m_brInput.Close();
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m_brInput = null;
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}
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else // Writing mode
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{
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if(m_nBufferPos == 0) // No data left in buffer
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WriteHashedBlock(); // Write terminating block
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else
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{
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WriteHashedBlock(); // Write remaining buffered data
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WriteHashedBlock(); // Write terminating block
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}
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Flush();
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m_bwOutput.Close();
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m_bwOutput = null;
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}
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m_sBaseStream.Close();
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m_sBaseStream = null;
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}
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}
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public override long Seek(long lOffset, SeekOrigin soOrigin)
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{
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throw new NotSupportedException();
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}
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public override void SetLength(long lValue)
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{
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throw new NotSupportedException();
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}
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public override int Read(byte[] pbBuffer, int nOffset, int nCount)
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{
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if(m_bWriting) throw new InvalidOperationException();
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int nRemaining = nCount;
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while(nRemaining > 0)
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{
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if(m_nBufferPos == m_pbBuffer.Length)
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{
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if(ReadHashedBlock() == false)
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return nCount - nRemaining; // Bytes actually read
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}
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int nCopy = Math.Min(m_pbBuffer.Length - m_nBufferPos, nRemaining);
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Array.Copy(m_pbBuffer, m_nBufferPos, pbBuffer, nOffset, nCopy);
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nOffset += nCopy;
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m_nBufferPos += nCopy;
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nRemaining -= nCopy;
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}
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return nCount;
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}
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private bool ReadHashedBlock()
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{
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if(m_bEos) return false; // End of stream reached already
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m_nBufferPos = 0;
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if(m_brInput.ReadUInt32() != m_uBufferIndex)
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throw new InvalidDataException();
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++m_uBufferIndex;
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byte[] pbStoredHash = m_brInput.ReadBytes(32);
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if((pbStoredHash == null) || (pbStoredHash.Length != 32))
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throw new InvalidDataException();
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int nBufferSize = 0;
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try { nBufferSize = m_brInput.ReadInt32(); }
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catch(NullReferenceException) // Mono bug workaround (LaunchPad 783268)
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{
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if(!NativeLib.IsUnix()) throw;
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}
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if(nBufferSize < 0)
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throw new InvalidDataException();
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if(nBufferSize == 0)
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{
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for(int iHash = 0; iHash < 32; ++iHash)
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{
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if(pbStoredHash[iHash] != 0)
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throw new InvalidDataException();
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}
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m_bEos = true;
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m_pbBuffer = new byte[0];
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return false;
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}
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m_pbBuffer = m_brInput.ReadBytes(nBufferSize);
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if((m_pbBuffer == null) || ((m_pbBuffer.Length != nBufferSize) && m_bVerify))
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throw new InvalidDataException();
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if(m_bVerify)
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{
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SHA256Managed sha256 = new SHA256Managed();
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byte[] pbComputedHash = sha256.ComputeHash(m_pbBuffer);
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if((pbComputedHash == null) || (pbComputedHash.Length != 32))
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throw new InvalidOperationException();
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for(int iHashPos = 0; iHashPos < 32; ++iHashPos)
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{
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if(pbStoredHash[iHashPos] != pbComputedHash[iHashPos])
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throw new InvalidDataException();
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}
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}
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return true;
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}
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public override void Write(byte[] pbBuffer, int nOffset, int nCount)
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{
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if(!m_bWriting) throw new InvalidOperationException();
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while(nCount > 0)
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{
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if(m_nBufferPos == m_pbBuffer.Length)
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WriteHashedBlock();
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int nCopy = Math.Min(m_pbBuffer.Length - m_nBufferPos, nCount);
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Array.Copy(pbBuffer, nOffset, m_pbBuffer, m_nBufferPos, nCopy);
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nOffset += nCopy;
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m_nBufferPos += nCopy;
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nCount -= nCopy;
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}
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}
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private void WriteHashedBlock()
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{
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m_bwOutput.Write(m_uBufferIndex);
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++m_uBufferIndex;
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if(m_nBufferPos > 0)
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{
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SHA256Managed sha256 = new SHA256Managed();
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#if !KeePassLibSD
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byte[] pbHash = sha256.ComputeHash(m_pbBuffer, 0, m_nBufferPos);
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#else
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byte[] pbHash;
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if(m_nBufferPos == m_pbBuffer.Length)
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pbHash = sha256.ComputeHash(m_pbBuffer);
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else
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{
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byte[] pbData = new byte[m_nBufferPos];
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Array.Copy(m_pbBuffer, 0, pbData, 0, m_nBufferPos);
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pbHash = sha256.ComputeHash(pbData);
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}
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#endif
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m_bwOutput.Write(pbHash);
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}
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else
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{
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m_bwOutput.Write((ulong)0); // Zero hash
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m_bwOutput.Write((ulong)0);
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m_bwOutput.Write((ulong)0);
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m_bwOutput.Write((ulong)0);
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}
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m_bwOutput.Write(m_nBufferPos);
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if(m_nBufferPos > 0)
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m_bwOutput.Write(m_pbBuffer, 0, m_nBufferPos);
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m_nBufferPos = 0;
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}
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}
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}
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