public void DecryptRecord(byte[] fragment, out byte[] dcrFragment, out byte[] dcrMAC)
{
var fragmentSize = 0;
var paddingLength = 0;
// Decrypt message fragment ( fragment + mac [+ padding + padding_length] )
DecryptionCipher.TransformBlock(fragment, 0, fragment.Length, fragment, 0);
// optimization: decrypt "in place", worst case: padding will reduce the size of the data
// this will cut in half the memory allocations (dcrFragment and dcrMAC remains)
// Calculate fragment size
if (CipherMode == CipherMode.CBC)
{
// Calculate padding_length
paddingLength = fragment[fragment.Length - 1];
fragmentSize = fragment.Length - (paddingLength + 1) - HashSize;
}
else
{
fragmentSize = fragment.Length - HashSize;
}
dcrFragment = new byte[fragmentSize];
dcrMAC = new byte[HashSize];
Buffer.BlockCopy(fragment, 0, dcrFragment, 0, dcrFragment.Length);
Buffer.BlockCopy(fragment, dcrFragment.Length, dcrMAC, 0, dcrMAC.Length);
}
public void DecryptRecord(byte[] fragment, out byte[] dcrFragment, out byte[] dcrMAC)
{
int num = 0;
int num2 = 0;
DecryptionCipher.TransformBlock(fragment, 0, fragment.Length, fragment, 0);
if (CipherMode == CipherMode.CBC)
{
num2 = fragment[fragment.Length - 1];
num = fragment.Length - (num2 + 1) - HashSize;
}
else
{
num = fragment.Length - HashSize;
}
dcrFragment = new byte[num];
dcrMAC = new byte[HashSize];
Buffer.BlockCopy(fragment, 0, dcrFragment, 0, dcrFragment.Length);
Buffer.BlockCopy(fragment, dcrFragment.Length, dcrMAC, 0, dcrMAC.Length);
}
