public static ICryptoTransform GetDecryptor(byte SymAlgo, byte[] IV, byte[] SessionKey)
{
if (!IsValidAlgoCode(SymAlgo))
{
throw new NotImplementedException("Algorithm not implemented");
}
int KeySize = SymmetricAlgorithmTypes.GetKeySize(SymAlgo);
int BlockSizeBits = SymmetricAlgorithmTypes.GetBlockSize(SymAlgo);
if (IV == null)
{
IV = new byte[BlockSizeBits / 8]; // Set to all zeros by default
}
RijndaelManaged aes = new RijndaelManaged
{
KeySize = KeySize,
BlockSize = BlockSizeBits,
FeedbackSize = BlockSizeBits,
Key = SessionKey,
IV = IV,
Mode = CipherMode.CFB,
Padding = PaddingMode.None
};
return(aes.CreateDecryptor());
}
public byte[] GetKey(string Password)
{
int KeySize = SymmetricAlgorithmTypes.GetKeySize(SymAlgo);
int DesiredBytes = (byte)(KeySize / 8);
HashAlgorithm HashAlgo = HashAlgorithmTypes.GetHashAlgoManaged(HashAlgorithm);
byte[] Key = GetSaltedIterated(HashAlgo, DesiredBytes, Salt, Encoding.ASCII.GetBytes(Password), ByteCount);
return(Key);
}
