//-----------Decrypte-----------
private byte[] _Decrypte_ECB_OneBlock(byte[] block)
{
if (block.Length != BlockLength)
{
throw new Exception("Block isn't correct");
}
var worker = new BlockWorker(new Buffer(block), _keys._Key);
return(worker.Decrypte().ToBytes());
}
public byte[] Decrypte_RC5_CBC_Pad()
{
var prevBlock = new Buffer(_Decrypte_ECB_OneBlock(_keys.GetAndDeleteFirst()));
var decryptedFile = new List <byte>(BlockLength * _keys.Count);
foreach (var block in _keys)
{
var currentBlock = new Buffer(block);
var worker = new BlockWorker(currentBlock, _keys._Key);
decryptedFile.AddRange((prevBlock ^ worker.Decrypte()).ToBytes());
prevBlock = currentBlock;
}
var lastByte = decryptedFile.Last();
bool IsAdditiveBytes = true;
if ((int)lastByte < decryptedFile.Count)
{
for (int i = decryptedFile.Count - (int)lastByte; i < decryptedFile.Count; ++i)
{
if (lastByte != decryptedFile[i])
{
IsAdditiveBytes = false;
break;
}
}
}
else
{
IsAdditiveBytes = false;
}
if (IsAdditiveBytes)
{
decryptedFile.RemoveRange(decryptedFile.Count - (int)lastByte, (int)lastByte);
}
return(decryptedFile.ToArray());
}
