private byte[] GetCounterBlock(long blockCounter)
{
if (_cachedIv == null)
{
_cachedIv = _algorithm.IV();
}
byte[] counterBytes = blockCounter.GetBigEndianBytes();
byte[] counterBlock = ((byte[])_cachedIv.Clone()).Xor(_cachedIv.Length - counterBytes.Length, counterBytes, 0, counterBytes.Length);
return(counterBlock);
}
