// we don't need no craftcontent!
public Packet[] Decrypt(byte[] bKey, SymmetricAlgorithm saAlgo)
{
saAlgo.Mode = CipherMode.OpenPGP_CFB;
saAlgo.Key = bKey;
ICryptoTransform ictDecrypt = saAlgo.CreateDecryptor();
int iBS = saAlgo.BlockSize >> 3;
int iLength = bBody.Length - iBS - 2;
byte[] bOutput = new byte[bBody.Length];
ictDecrypt.TransformBlock(bBody, 0, bBody.Length, ref bOutput, 0);
byte[] bFinal = new byte[iLength];
Array.Copy(bOutput, bFinal, iLength);
Packet[] pReturn = Packet.ParsePackets(bFinal);
return pReturn;
}
public SymmetricTransform(SymmetricAlgorithm symmAlgo, bool encryption, byte[] rgbIV)
{
algo = symmAlgo;
encrypt = encryption;
BlockSizeByte = (algo.BlockSize >> 3);
// mode buffers
temp = new byte [BlockSizeByte];
Array.Copy (rgbIV, 0, temp, 0, BlockSizeByte);
temp2 = new byte [BlockSizeByte];
FeedBackByte = (algo.FeedbackSize >> 3);
FeedBackIter = (int) BlockSizeByte / FeedBackByte;
//FeedBackIter = 1;
// transform buffers
workBuff = new byte [BlockSizeByte];
workout = new byte [BlockSizeByte];
//OpenPGP CFB needs an all zero IV
if (algo.Mode == CipherMode.OpenPGP_CFB) {
algo.IV = new byte[algo.BlockSize >> 3];
}
// needed for openpgp's ciphertext feedback mode
openPGPStart = new byte[(algo.BlockSize >> 3) + 2];
}
// Default constructor.
internal DESTransform(SymmetricAlgorithm symmAlgo, bool encryption, byte[] key, byte[] iv)
: base(symmAlgo, encryption, iv)
{
keySchedule = new byte [KEY_BYTE_SIZE * 16];
byteBuff = new byte [BLOCK_BYTE_SIZE];
dwordBuff = new uint [BLOCK_BYTE_SIZE / 4];
SetKey (key);
}