public byte[] ofbDecoding(byte[] key, byte[] message, byte[] iv)
{
Crypto.Engines.AesEngine engine = new Crypto.Engines.AesEngine();
Crypto.Modes.OfbBlockCipher blockCipher = new Crypto.Modes.OfbBlockCipher(engine, 128);
Crypto.Paddings.PaddedBufferedBlockCipher cipher = new Crypto.Paddings.PaddedBufferedBlockCipher(blockCipher);
Crypto.Parameters.KeyParameter keyParam = new Crypto.Parameters.KeyParameter(key);
Crypto.Parameters.ParametersWithIV keyParamWithIV = new Crypto.Parameters.ParametersWithIV(keyParam, iv);
cipher.Init(false, keyParamWithIV);
byte[] comparisonBytes = new byte[cipher.GetOutputSize(message.Length)];
int length = cipher.ProcessBytes(message, comparisonBytes, 0);
cipher.DoFinal(comparisonBytes, length);
return(comparisonBytes);
}
private void DoCbc(byte[] key, byte[] iv, byte[] pt, byte[] expected)
{
Org.BouncyCastle.Crypto.Paddings.PaddedBufferedBlockCipher c =
new Org.BouncyCastle.Crypto.Paddings.PaddedBufferedBlockCipher(
new Org.BouncyCastle.Crypto.Modes.CbcBlockCipher(
new Org.BouncyCastle.Crypto.Engines.SerpentEngine())
, new Org.BouncyCastle.Crypto.Paddings.Pkcs7Padding());
byte[] ct = new byte[expected.Length];
c.Init(true, new Org.BouncyCastle.Crypto.Parameters.ParametersWithIV(
new Org.BouncyCastle.Crypto.Parameters.KeyParameter(key), iv));
int l = c.ProcessBytes(pt, 0, pt.Length, ct, 0);
c.DoFinal(ct, l);
if (!Org.BouncyCastle.Utilities.Arrays.AreEqual(expected, ct))
{
System.Console.WriteLine("CBC test failed");
}
}