A little off-topic, although I don't know where else to ask ;)
To my great dismay, .NET does not have OFB cipher mode available in
the Rinjdael implementation, however looking at Wikipedia (OFB), I
should be able to use ECB with the following scheme:
Rijndael alg = new Rinjdael();
alg.KeySize=16;
alg.Mode = CipherMode.ECB;
byte[] block = new byte[16];
ICryptoTransform t = alg.CreateEncryptor(key, block);
Buffer.BlockCopy(iv, 0, block, 0, 16); // copy iv to block to start
up
len = inputStream.Length;
while (len > 0)
{
byte[] inputBlock = new byte[16];
int n = inputStream.Read(inputBlock, 0, 16);
for (int i = 0; i < n; ++i)
{
// Do the XOR
block[i] ^= inputBlock[i];
}
outputStream.Write(block, 0, block.Length);
len -= n;
}
???
TIA
/Rob
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