mirror of
https://github.com/wismna/ModernKeePass.git
synced 2025-10-03 23:50:18 -04:00
KeePassLib finally portable (but version 2.19)
Windows Store project stub
This commit is contained in:
321
ModernKeePassLib/Serialization/HashedBlockStream.cs
Normal file
321
ModernKeePassLib/Serialization/HashedBlockStream.cs
Normal file
@@ -0,0 +1,321 @@
|
||||
/*
|
||||
KeePass Password Safe - The Open-Source Password Manager
|
||||
Copyright (C) 2003-2012 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.IO;
|
||||
using System.Text;
|
||||
|
||||
using ModernKeePassLib.Native;
|
||||
using ModernKeePassLib.Utility;
|
||||
using ModernKeePassLib.Cryptography;
|
||||
|
||||
#if KeePassLibSD
|
||||
using ModernKeePassLibSD;
|
||||
#endif
|
||||
|
||||
namespace ModernKeePassLib.Serialization
|
||||
{
|
||||
public sealed class HashedBlockStream : Stream
|
||||
{
|
||||
private const int m_nDefaultBufferSize = 1024 * 1024; // 1 MB
|
||||
|
||||
private Stream m_sBaseStream;
|
||||
private bool m_bWriting;
|
||||
private bool m_bVerify;
|
||||
private bool m_bEos = false;
|
||||
|
||||
private BinaryReader m_brInput;
|
||||
private BinaryWriter m_bwOutput;
|
||||
|
||||
private byte[] m_pbBuffer;
|
||||
private int m_nBufferPos = 0;
|
||||
|
||||
private uint m_uBufferIndex = 0;
|
||||
|
||||
public override bool CanRead
|
||||
{
|
||||
get { return !m_bWriting; }
|
||||
}
|
||||
|
||||
public override bool CanSeek
|
||||
{
|
||||
get { return false; }
|
||||
}
|
||||
|
||||
public override bool CanWrite
|
||||
{
|
||||
get { return m_bWriting; }
|
||||
}
|
||||
|
||||
public override long Length
|
||||
{
|
||||
get { throw new NotSupportedException(); }
|
||||
}
|
||||
|
||||
public override long Position
|
||||
{
|
||||
get { throw new NotSupportedException(); }
|
||||
set { throw new NotSupportedException(); }
|
||||
}
|
||||
|
||||
public HashedBlockStream(Stream sBaseStream, bool bWriting)
|
||||
{
|
||||
Initialize(sBaseStream, bWriting, 0, true);
|
||||
}
|
||||
|
||||
public HashedBlockStream(Stream sBaseStream, bool bWriting, int nBufferSize)
|
||||
{
|
||||
Initialize(sBaseStream, bWriting, nBufferSize, true);
|
||||
}
|
||||
|
||||
public HashedBlockStream(Stream sBaseStream, bool bWriting, int nBufferSize,
|
||||
bool bVerify)
|
||||
{
|
||||
Initialize(sBaseStream, bWriting, nBufferSize, bVerify);
|
||||
}
|
||||
|
||||
private void Initialize(Stream sBaseStream, bool bWriting, int nBufferSize,
|
||||
bool bVerify)
|
||||
{
|
||||
if(sBaseStream == null) throw new ArgumentNullException("sBaseStream");
|
||||
if(nBufferSize < 0) throw new ArgumentOutOfRangeException("nBufferSize");
|
||||
|
||||
if(nBufferSize == 0) nBufferSize = m_nDefaultBufferSize;
|
||||
|
||||
m_sBaseStream = sBaseStream;
|
||||
m_bWriting = bWriting;
|
||||
m_bVerify = bVerify;
|
||||
|
||||
UTF8Encoding utf8 = StrUtil.Utf8;
|
||||
if(m_bWriting == false) // Reading mode
|
||||
{
|
||||
if(m_sBaseStream.CanRead == false)
|
||||
throw new InvalidOperationException();
|
||||
|
||||
m_brInput = new BinaryReader(sBaseStream, utf8);
|
||||
|
||||
m_pbBuffer = new byte[0];
|
||||
}
|
||||
else // Writing mode
|
||||
{
|
||||
if(m_sBaseStream.CanWrite == false)
|
||||
throw new InvalidOperationException();
|
||||
|
||||
m_bwOutput = new BinaryWriter(sBaseStream, utf8);
|
||||
|
||||
m_pbBuffer = new byte[nBufferSize];
|
||||
}
|
||||
}
|
||||
|
||||
public override void Flush()
|
||||
{
|
||||
if(m_bWriting) m_bwOutput.Flush();
|
||||
}
|
||||
|
||||
#if TODO
|
||||
public override void Close()
|
||||
{
|
||||
if(m_sBaseStream != null)
|
||||
{
|
||||
if(m_bWriting == false) // Reading mode
|
||||
{
|
||||
m_brInput.Close();
|
||||
m_brInput = null;
|
||||
}
|
||||
else // Writing mode
|
||||
{
|
||||
if(m_nBufferPos == 0) // No data left in buffer
|
||||
WriteHashedBlock(); // Write terminating block
|
||||
else
|
||||
{
|
||||
WriteHashedBlock(); // Write remaining buffered data
|
||||
WriteHashedBlock(); // Write terminating block
|
||||
}
|
||||
|
||||
Flush();
|
||||
m_bwOutput.Close();
|
||||
m_bwOutput = null;
|
||||
}
|
||||
|
||||
m_sBaseStream.Close();
|
||||
m_sBaseStream = null;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
public override long Seek(long lOffset, SeekOrigin soOrigin)
|
||||
{
|
||||
throw new NotSupportedException();
|
||||
}
|
||||
|
||||
public override void SetLength(long lValue)
|
||||
{
|
||||
throw new NotSupportedException();
|
||||
}
|
||||
|
||||
public override int Read(byte[] pbBuffer, int nOffset, int nCount)
|
||||
{
|
||||
if(m_bWriting) throw new InvalidOperationException();
|
||||
|
||||
int nRemaining = nCount;
|
||||
while(nRemaining > 0)
|
||||
{
|
||||
if(m_nBufferPos == m_pbBuffer.Length)
|
||||
{
|
||||
if(ReadHashedBlock() == false)
|
||||
return nCount - nRemaining; // Bytes actually read
|
||||
}
|
||||
|
||||
int nCopy = Math.Min(m_pbBuffer.Length - m_nBufferPos, nRemaining);
|
||||
|
||||
Array.Copy(m_pbBuffer, m_nBufferPos, pbBuffer, nOffset, nCopy);
|
||||
|
||||
nOffset += nCopy;
|
||||
m_nBufferPos += nCopy;
|
||||
|
||||
nRemaining -= nCopy;
|
||||
}
|
||||
|
||||
return nCount;
|
||||
}
|
||||
|
||||
private bool ReadHashedBlock()
|
||||
{
|
||||
if(m_bEos) return false; // End of stream reached already
|
||||
|
||||
m_nBufferPos = 0;
|
||||
|
||||
if(m_brInput.ReadUInt32() != m_uBufferIndex)
|
||||
throw new InvalidDataException();
|
||||
++m_uBufferIndex;
|
||||
|
||||
byte[] pbStoredHash = m_brInput.ReadBytes(32);
|
||||
if((pbStoredHash == null) || (pbStoredHash.Length != 32))
|
||||
throw new InvalidDataException();
|
||||
|
||||
int nBufferSize = 0;
|
||||
try { nBufferSize = m_brInput.ReadInt32(); }
|
||||
catch(NullReferenceException) // Mono bug workaround (LaunchPad 783268)
|
||||
{
|
||||
if(!NativeLib.IsUnix()) throw;
|
||||
}
|
||||
|
||||
if(nBufferSize < 0)
|
||||
throw new InvalidDataException();
|
||||
|
||||
if(nBufferSize == 0)
|
||||
{
|
||||
for(int iHash = 0; iHash < 32; ++iHash)
|
||||
{
|
||||
if(pbStoredHash[iHash] != 0)
|
||||
throw new InvalidDataException();
|
||||
}
|
||||
|
||||
m_bEos = true;
|
||||
m_pbBuffer = new byte[0];
|
||||
return false;
|
||||
}
|
||||
|
||||
m_pbBuffer = m_brInput.ReadBytes(nBufferSize);
|
||||
if((m_pbBuffer == null) || ((m_pbBuffer.Length != nBufferSize) && m_bVerify))
|
||||
throw new InvalidDataException();
|
||||
|
||||
if(m_bVerify)
|
||||
{
|
||||
byte[] pbComputedHash = SHA256Managed.Instance.ComputeHash(m_pbBuffer);
|
||||
if((pbComputedHash == null) || (pbComputedHash.Length != 32))
|
||||
throw new InvalidOperationException();
|
||||
|
||||
for(int iHashPos = 0; iHashPos < 32; ++iHashPos)
|
||||
{
|
||||
if(pbStoredHash[iHashPos] != pbComputedHash[iHashPos])
|
||||
throw new InvalidDataException();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
public override void Write(byte[] pbBuffer, int nOffset, int nCount)
|
||||
{
|
||||
if(!m_bWriting) throw new InvalidOperationException();
|
||||
|
||||
while(nCount > 0)
|
||||
{
|
||||
if(m_nBufferPos == m_pbBuffer.Length)
|
||||
WriteHashedBlock();
|
||||
|
||||
int nCopy = Math.Min(m_pbBuffer.Length - m_nBufferPos, nCount);
|
||||
|
||||
Array.Copy(pbBuffer, nOffset, m_pbBuffer, m_nBufferPos, nCopy);
|
||||
|
||||
nOffset += nCopy;
|
||||
m_nBufferPos += nCopy;
|
||||
|
||||
nCount -= nCopy;
|
||||
}
|
||||
}
|
||||
|
||||
private void WriteHashedBlock()
|
||||
{
|
||||
Debug.Assert(false, "not yet implemented");
|
||||
return ;
|
||||
#if TODO
|
||||
m_bwOutput.Write(m_uBufferIndex);
|
||||
++m_uBufferIndex;
|
||||
|
||||
if(m_nBufferPos > 0)
|
||||
{
|
||||
SHA256Managed sha256 = new SHA256Managed();
|
||||
|
||||
#if !KeePassLibSD
|
||||
byte[] pbHash = sha256.ComputeHash(m_pbBuffer, 0, m_nBufferPos);
|
||||
#else
|
||||
byte[] pbHash;
|
||||
if(m_nBufferPos == m_pbBuffer.Length)
|
||||
pbHash = sha256.ComputeHash(m_pbBuffer);
|
||||
else
|
||||
{
|
||||
byte[] pbData = new byte[m_nBufferPos];
|
||||
Array.Copy(m_pbBuffer, 0, pbData, 0, m_nBufferPos);
|
||||
pbHash = sha256.ComputeHash(pbData);
|
||||
}
|
||||
#endif
|
||||
|
||||
m_bwOutput.Write(pbHash);
|
||||
}
|
||||
else
|
||||
{
|
||||
m_bwOutput.Write((ulong)0); // Zero hash
|
||||
m_bwOutput.Write((ulong)0);
|
||||
m_bwOutput.Write((ulong)0);
|
||||
m_bwOutput.Write((ulong)0);
|
||||
}
|
||||
|
||||
m_bwOutput.Write(m_nBufferPos);
|
||||
|
||||
if(m_nBufferPos > 0)
|
||||
m_bwOutput.Write(m_pbBuffer, 0, m_nBufferPos);
|
||||
|
||||
m_nBufferPos = 0;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user