The block size of AES is 128 bits, regardless of whether a 128- or 256-bit key is used, and therefore the output of AES-CMAC is always 128 bits. 160-bit digests are already supported by RFC7822, but there's no way to make AES-CMAC produce one.
On Feb 28, 2018 7:47 AM, "Harlan Stenn" <[email protected]> wrote: > Most everybody seems to think that 160 bits of digest is all that will > ever be needed. > > I'm perfectly happy making sure longer digests are supported. > -- Harlan Stenn <[email protected]> > http://networktimefoundation.org - be a member! > > _______________________________________________ > ntp mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/ntp >
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