protected override Result DoWrite(long offset, ReadOnlySpan <byte> source)
{
int size = source.Length;
long sectorIndex = offset / SectorSize;
if (_writeTransform == null)
{
_writeTransform = new Aes128XtsTransform(_key1, _key2, !_decryptRead);
}
source.CopyTo(_tempBuffer);
_writeTransform.TransformBlock(_tempBuffer, 0, size, (ulong)sectorIndex);
return(base.DoWrite(offset, _tempBuffer.AsSpan(0, size)));
}
protected override Result WriteImpl(long offset, ReadOnlySpan <byte> source)
{
int size = source.Length;
long sectorIndex = offset / SectorSize;
if (_encryptor == null)
{
_encryptor = new Aes128XtsTransform(_key1, _key2, false);
}
source.CopyTo(_tempBuffer);
_encryptor.TransformBlock(_tempBuffer, 0, size, (ulong)sectorIndex);
return(base.WriteImpl(offset, _tempBuffer.AsSpan(0, size)));
}
protected override Result DoRead(long offset, Span <byte> destination)
{
int size = destination.Length;
long sectorIndex = offset / SectorSize;
if (_readTransform == null)
{
_readTransform = new Aes128XtsTransform(_key1, _key2, _decryptRead);
}
Result rc = base.DoRead(offset, _tempBuffer.AsSpan(0, size));
if (rc.IsFailure())
{
return(rc);
}
_readTransform.TransformBlock(_tempBuffer, 0, size, (ulong)sectorIndex);
_tempBuffer.AsSpan(0, size).CopyTo(destination);
return(Result.Success);
}