public SymmetricTransform(SymmetricAlgorithm symmAlgo, bool encryption, byte[] rgbIV)
{
algo = symmAlgo;
encrypt = encryption;
BlockSizeByte = (algo.BlockSize >> 3);
if (rgbIV == null)
{
rgbIV = KeyBuilder.IV(BlockSizeByte);
}
else
{
rgbIV = (byte[])rgbIV.Clone();
}
#if NET_2_0
// compare the IV length with the "currently selected" block size and *ignore* IV that are too big
if (rgbIV.Length < BlockSizeByte)
{
string msg = Locale.GetText("IV is too small ({0} bytes), it should be {1} bytes long.",
rgbIV.Length, BlockSizeByte);
throw new CryptographicException(msg);
}
#endif
// mode buffers
temp = new byte [BlockSizeByte];
Buffer.BlockCopy(rgbIV, 0, temp, 0, System.Math.Min(BlockSizeByte, rgbIV.Length));
temp2 = new byte [BlockSizeByte];
#if !NET_2_1 || MONOTOUCH
FeedBackByte = (algo.FeedbackSize >> 3);
if (FeedBackByte != 0)
{
FeedBackIter = (int)BlockSizeByte / FeedBackByte;
}
#endif
// transform buffers
workBuff = new byte [BlockSizeByte];
workout = new byte [BlockSizeByte];
}
public override void GenerateKey()
{
Key = KeyBuilder.Key(KeySizeValue >> 3);
}