private static byte[] DoCryptStuff(byte[] data, IKey key, CipherDirection direction, CipherMode cipherMode, byte[] iv)
{
byte[] result;
String transformation = key.GetAlgorithm();
if (key.GetAlgorithm().StartsWith(ALG_DES))
{
transformation += "/" + ModetoString(cipherMode) + "/" + DES_NO_PADDING;
}
ICipherParameters keyparam = new KeyParameter(key.GetEncoded());
IBufferedCipher cipher = CipherUtilities.GetCipher(transformation);
if (cipherMode != CipherMode.ECB)
{
keyparam = new ParametersWithIV(keyparam, iv);
}
byte[] output = new byte[cipher.GetOutputSize(data.Length)];
cipher.Init(direction == CipherDirection.ENCRYPT_MODE ? true : false, keyparam);
result = cipher.DoFinal(data);
if (cipherMode != CipherMode.ECB)
{
Array.Copy(result, result.Length - 8, iv, 0, iv.Length);
}
//AlgorithmParameterSpec aps = null;
//try
//{
// Cipher c1 = Cipher.getInstance(transformation, provider.getName());
// if (cipherMode != CipherMode.ECB)
// aps = new IvParameterSpec(iv);
// c1.init(direction, key, aps);
// result = c1.doFinal(data);
// if (cipherMode != CipherMode.ECB)
// System.arraycopy(result, result.length - 8, iv, 0, iv.length);
//}
//catch (Exception e)
//{
// throw e;
//}
return(result);
}
public static byte[] ExtractDESKeyMaterial(short keyLength, IKey clearDESKey)
{
String keyAlg = clearDESKey.GetAlgorithm();
String keyFormat = clearDESKey.GetFormat();
if (keyFormat.CompareTo("RAW") != 0)
{
throw new Exception("Unsupported DES key encoding format: " + keyFormat);
}
if (!keyAlg.StartsWith(ALG_DES))
{
throw new Exception("Unsupported key algorithm: " + keyAlg);
}
byte[] clearKeyBytes = clearDESKey.GetEncoded();
clearKeyBytes = Util.Trim(clearKeyBytes, GetBytesLength(keyLength));
return(clearKeyBytes);
}