CMAC encoding works fine when the message to encode has 8, 16 32 etc.
bytes. When ever the length is not a standard block size, the results
are not correct (I have a list with testvectors to check the result).
According the the standard (NIST 800-38B) the message should be
extended with padding byte, first byte 0x80, the others 0x00. When I
do this the result is also incorrect.
I can imaging that I have to set a parameter to indicate padding is
provided, but it is not clear what must be done to get the encoding
correct when using padding bytes.
Does anyone has a suggestion?
The relevant piece of source code is:
CMAC<AES> Cmac;
// Fill bKey; bTestdata with testdata : result in bTestDecr
Cmac.SetKey(bKey, sizeof(bKey));
Cmac.Update(bTestdata, sizeof(bTestdata));
Cmac.Final(bTestDecr);
regards,
Ger
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