public static byte[] XTS(byte[] Key1, byte[] Key2, int SectorSize, byte[] Data, ulong Sector, bool Encrypt)
{
byte[] TransformedBytes, BlockData;
Xts XTS128 = XtsAes128.Create(Key1, Key2);
int Blocks;
var MemStrm = new MemoryStream();
var Writer = new BinaryWriter(MemStrm);
XtsCryptoTransform CryptoTransform;
if (Encrypt)
{
CryptoTransform = XTS128.CreateEncryptor();
}
else
{
CryptoTransform = XTS128.CreateDecryptor();
}
BlockData = new byte[SectorSize];
Blocks = Data.Length / SectorSize;
for (int i = 0; i < Blocks; i++)
{
CryptoTransform.TransformBlock(Data, i * SectorSize, SectorSize, BlockData, 0, Sector++);
Writer.Write(BlockData);
}
TransformedBytes = MemStrm.ToArray();
return(TransformedBytes);
}
public override int Read(byte[] buffer, int offset, int count)
{
ValidateSize(count);
var currentSector = CurrentSector;
var ret = base.Read(_tempBuffer, 0, count);
if (ret == 0)
{
return(0);
}
if (_decryptor == null)
{
_decryptor = _xts.CreateDecryptor();
}
var retV = _decryptor.TransformBlock(_tempBuffer, 0, ret, buffer, offset, currentSector);
return(retV);
}
