public override void GenerateKey()
{
base.KeyValue = RNG.GetBytes(base.KeySizeValue >> 3);
}
private byte[] EncryptFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
int mod = inputCount % InputBlockSize;
if (mod != 0 && _algo.Padding == PaddingMode.None)
{
throw new CryptographicException();
}
if (inputCount == 0 && (_algo.Padding == PaddingMode.None || _algo.Padding == PaddingMode.Zeros))
{
return(new byte[0]);
}
int retBlocks = inputCount / InputBlockSize;
bool appendLastBlock = false;
if (mod > 0 || (_algo.Padding != PaddingMode.None && _algo.Padding != PaddingMode.Zeros))
{
retBlocks++;
appendLastBlock = true;
}
byte padSize = (byte)(retBlocks * InputBlockSize - inputCount);
int norSize = inputCount - mod;
byte[] buf = new byte [retBlocks * OutputBlockSize];
TransformBlock(inputBuffer, inputOffset, norSize, buf, 0);
if (appendLastBlock)
{
byte[] lastBlock = new byte [InputBlockSize];
switch (_algo.Padding)
{
case PaddingMode.ANSIX923:
Buffer.BlockCopy(inputBuffer, inputOffset + norSize, lastBlock, 0, mod);
lastBlock [lastBlock.Length - 1] = padSize;
break;
case PaddingMode.PKCS7:
Buffer.BlockCopy(inputBuffer, inputOffset + norSize, lastBlock, 0, mod);
for (int i = mod; i < lastBlock.Length; i++)
{
lastBlock[i] = padSize;
}
break;
case PaddingMode.ISO10126:
RNG.GetBytes(lastBlock);
Buffer.BlockCopy(inputBuffer, inputOffset + norSize, lastBlock, 0, mod);
lastBlock[lastBlock.Length - 1] = padSize;
break;
default:
Buffer.BlockCopy(inputBuffer, inputOffset + norSize, lastBlock, 0, mod);
break;
}
TransformBlock(lastBlock, 0, InputBlockSize, buf, (retBlocks - 1) * OutputBlockSize);
Array.Clear(lastBlock, 0, lastBlock.Length);
}
return(buf);
}
public override void GenerateIV()
{
base.IVValue = RNG.GetBytes(base.BlockSizeValue >> 3);
}
