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Re: Last Call: Combined DES-CBC, HMAC and Replay Prevention Security Transform to Proposed Standard
> I went through the exercise of coding up an example datagram as per the
> draft. My goal was to chase down details about byte/bit orderings in and
> out of the DES, MD5, HMAC, and replay-count operations. I felt that
> most of the details were resolvable using the description in the draft
> and the cited references. However, in a few cases I felt I was
> guessing.
>
> One suggestion I have is that the draft include an example datagram,
> before and after encryption. This will unambiguously nail down all
> details about bit/byte ordering. Note that the individual specs for DES
> [FIPS-41], MD5 [RFC-1321], and HMAC [Krawczyk] include such examples.
This is a fantastic idea. Previous versions had just such an example. I
will add this verbatum as an appendix.
> Below is the example I came up with. (If anybody is inclined to verify
> the example, I'd sure appreciate it. :-) ) Items marked with (*) are
> places where I felt I was guessing about byte/bit orderings; some
> clarification about these may be desirable.
Yes, independent verification would me nice. I have not done so.
> mike