| public DecryptMessage ( byte cipherText, int length ) : byte[] | ||
| cipherText | byte | The encrypted buffer. |
| length | int | /// The number of bytes to encrypt. /// Should be less than or equal to CipherText.Length. /// |
| return | byte[] | |
public byte[] DecryptMessage(byte[] cipherText, int length)
{
if (cipherText == null)
throw new ArgumentNullException("cipherText");
if (length > cipherText.Length)
throw new ArgumentOutOfRangeException("length",
"Bad length during Decryption: the length parameter must be smaller than or equal to the size of the destination array.");
byte[] plainText = new byte[length];
for (int i = 0; i < length; i++)
{
byte C = (byte)(cipherText[i] ^ MagicByte);
UpdateKeys(C);
plainText[i] = C;
}
return plainText;
}
public override int Read(byte[] buffer, int offset, int count)
{
if (_mode == CryptoMode.Encrypt)
{
throw new NotSupportedException("This stream does not encrypt via Read()");
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
byte[] db = new byte[count];
int n = _s.Read(db, 0, count);
byte[] decrypted = _cipher.DecryptMessage(db, n);
for (int i = 0; i < n; i++)
{
buffer[offset + i] = decrypted[i];
}
return(n);
}
