In message <001101c26e28$d85e6f90$[EMAIL PROTECTED]> on Mon, 7 Oct 2002 13:42:01
-0400, "Chris Brook" <[EMAIL PROTECTED]> said:
cbrook> I have been running the NIST AES Algorithm Validation Suite
cbrook> (AVS) using the OpenSSL crypto library and all the results for
cbrook> all the modes come out as predicted, except for CFB 1-bit
cbrook> which is not supported by OpenSSL and CFB 8-bit which returns
cbrook> a "wrong" result. CFB 128-bit is fine.
No surprise there, only CFB-128 is implemented. If you look at other
algorithms that also implement a CFB mode, you will see that only the
CFB variant with the same feedback blocksize as the algorithm in
question is implemented. That's how Eric Young did it, and honestly,
I didn't find any reason for doing it differently for AES, as it seem
like the existing implementations are all that are used in SSL (which
is basically what sets the first requirements).
If you can point out where there would be a practical use for 1-bit or
8-bit CFB, we might reconsider.
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