private void ProcessSelectedPart(int BufferSize, long Begin, long End, Stream fsRead, Stream fsWrite, CryptMethod3Key Algorythm, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
byte[] Buffer = new byte[BufferSize];
byte[] CurBuffer = new byte[BufferSize];
byte[] temp;
IAsyncResult ReadResult;
IAsyncResult WriteResult;
fsRead.Seek(Begin, SeekOrigin.Begin);
ReadResult = fsRead.BeginRead(Buffer, 0, BufferSize, null, null);
fsRead.EndRead(ReadResult);
long i;
for (i = Begin + BufferSize; i < End; i += BufferSize)
{
fsRead.Seek(i, SeekOrigin.Begin);
ReadResult = fsRead.BeginRead(CurBuffer, 0, BufferSize, null, null);
Buffer = CryptBuffer(Buffer, Algorythm, KeyList1, KeyList2, KeyList3, ref IV, FlipKey);
fsWrite.Seek(i - BufferSize, SeekOrigin.Begin);
WriteResult = fsWrite.BeginWrite(Buffer, 0, BufferSize, null, null);
fsRead.EndRead(ReadResult);
fsWrite.EndWrite(WriteResult);
temp = Buffer;
Buffer = CurBuffer;
CurBuffer = temp;
}
fsWrite.Seek(i - BufferSize, SeekOrigin.Begin);
WriteResult = fsWrite.BeginWrite(Buffer, 0, BufferSize, null, null);
fsWrite.EndWrite(WriteResult);
}
private void EnCryptLastPart(int BufferSize, long Begin, Stream fsRead, Stream fsWrite, CryptMethod3Key Algorythm, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
ProcessSelectedPart(BufferSize, Begin, fsRead.Length - fsRead.Length % BufferSize, fsRead, fsWrite, Algorythm, KeyList1, KeyList2, KeyList3, IV, FlipKey);
if ((fsRead.Length % BufferSize) != 0)
{
byte[] Buffer = new byte[Const.BlockSizeForFile];
fsRead.Seek(fsRead.Length - fsRead.Length % BufferSize, SeekOrigin.Begin);
fsRead.Read(Buffer, 0, Const.BlockSizeForFile);
Buffer = CryptBuffer(Buffer, Algorythm, KeyList1, KeyList2, KeyList3, ref IV, FlipKey);
fsWrite.Seek(fsRead.Length - fsRead.Length % BufferSize, SeekOrigin.Begin);
fsWrite.Write(Buffer, 0, Const.BlockSizeForFile);
byte[] part = new byte[1] { (byte)(fsRead.Length % BufferSize) };
fsWrite.Seek(fsWrite.Length, SeekOrigin.Begin);
fsWrite.Write(part, 0, 1);
}
}
private void DeCryptLastPart(int BufferSize, long Begin, Stream fsRead, Stream fsWrite, CryptMethod3Key Algorythm, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
if ((fsRead.Length % BufferSize) != 0)
{
ProcessSelectedPart(BufferSize, Begin, fsRead.Length - fsRead.Length % BufferSize - BufferSize, fsRead, fsWrite, Algorythm, KeyList1, KeyList2, KeyList3, IV, FlipKey);
byte[] byt = new byte[1];
fsRead.Seek(-1, SeekOrigin.End);
fsRead.Read(byt, 0, 1);
byte[] lastPart = new byte[Const.BlockSizeForFile];
fsRead.Seek(-1 - Const.BlockSizeForFile, SeekOrigin.End);
fsRead.Read(lastPart, 0, Const.BlockSizeForFile);
lastPart = CryptBuffer(lastPart, Algorythm, KeyList1, KeyList2, KeyList3, ref IV, FlipKey);
try
{
fsWrite.Write(lastPart, 0, byt[0]);
}
catch
{
throw new Exception("Selected wrong file!");
}
}
else
{
ProcessSelectedPart(BufferSize, Begin, fsRead.Length, fsRead, fsWrite, Algorythm, KeyList1, KeyList2, KeyList3, IV, FlipKey);
}
}
private byte[] CryptBuffer(byte[] buffer, CryptMethod3Key Algorythm, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ref ulong IV, bool FlipKey)
{
ulong bufLong = 0;
for (long i = 0; i < buffer.Length; i += Const.BlockSizeForFile)
{
ulong temp = 0;
for (byte j = 0; j < Const.BlockSizeForFile; j++)
{
temp |= (ulong)buffer[i + j];
bufLong = temp;
temp <<= Const.BlockSizeForFile;
}
bufLong = Algorythm(bufLong, KeyList1, KeyList2, KeyList3, IV, FlipKey);
for (short j = Const.SBoxTablesShift; j >= 0; j--)
{
buffer[i + j] = (byte)(bufLong & Const.Mask8Bit);
bufLong >>= Const.BlockSizeForFile;
}
}
return buffer;
}
public void EnCryptFile(Stream fsRead, Stream fsWrite, CryptMethod3Key Algorythm, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
if (fsRead.Length > Const.FileBufferSize)
{
ProcessSelectedPart(Const.FileBufferSize, 0, fsRead.Length - fsRead.Length % Const.FileBufferSize, fsRead, fsWrite, Algorythm, KeyList1, KeyList2, KeyList3, IV, FlipKey);
}
EnCryptLastPart(Const.BlockSizeForFile, fsRead.Length - fsRead.Length % Const.FileBufferSize, fsRead, fsWrite, Algorythm, KeyList1, KeyList2, KeyList3, IV, FlipKey);
}
public DESCryptor()
{
_3des = new _3DES();
//DES
cm1k = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value, KeyList1, FlipKey);
};
cm1kCBCENcrupt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
IV = _3des.Crypt(value ^ IV, KeyList1, FlipKey);
return IV;
};
cm1kCBCDEcrupt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
IV = _3des.Crypt(value, KeyList1, FlipKey) ^ IV;
return IV;
};
//DESEEE3
DESEEE3 = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value, KeyList1, KeyList2, KeyList3, FlipKey, FlipKey, FlipKey);
};
DESEEE3CBCEncrypt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value ^ IV, KeyList1, KeyList2, KeyList3, FlipKey, FlipKey, FlipKey);
};
DESEEE3CBCDecrypt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value, KeyList1, KeyList2, KeyList3, FlipKey, FlipKey, FlipKey) ^ IV;
};
//DESEDE3
DESEDE3 = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value, KeyList1, KeyList2, KeyList3, FlipKey, !FlipKey, FlipKey);
};
DESEDE3CBCEncrypt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value ^ IV, KeyList1, KeyList2, KeyList3, FlipKey, !FlipKey, FlipKey);
};
DESEDE3CBCDecrypt = delegate(ulong value, ulong[] KeyList1, ulong[] KeyList2, ulong[] KeyList3, ulong IV, bool FlipKey)
{
return _3des.Crypt(value, KeyList1, KeyList2, KeyList3, FlipKey, !FlipKey, FlipKey) ^ IV;
};
}
