public virtual int DoFinal(
byte[] outBytes,
int outOff)
{
InitCipher();
int extra = bufOff;
byte[] tmp = new byte[bufBlock.Length];
bufOff = 0;
if (forEncryption)
{
cipher.ProcessBlock(bufBlock, 0, tmp, 0);
cipher.ProcessBlock(bufBlock, blockSize, tmp, blockSize);
Array.Copy(tmp, 0, outBytes, outOff, extra);
mac.BlockUpdate(tmp, 0, extra);
CalculateMac();
Array.Copy(macBlock, 0, outBytes, outOff + extra, macSize);
Reset(false);
return(extra + macSize);
}
else
{
if (extra > macSize)
{
mac.BlockUpdate(bufBlock, 0, extra - macSize);
cipher.ProcessBlock(bufBlock, 0, tmp, 0);
cipher.ProcessBlock(bufBlock, blockSize, tmp, blockSize);
Array.Copy(tmp, 0, outBytes, outOff, extra - macSize);
}
CalculateMac();
if (!VerifyMac(bufBlock, extra - macSize))
{
throw new InvalidCipherTextException("mac check in EAX failed");
}
Reset(false);
return(extra - macSize);
}
}
