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Re: [Ietf-krb-wg] CF2 test vectors for DES and 3DES

Sam Hartman <hartmans-ietf@mit.edu> Mon, 04 May 2009 19:21 UTC

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To: Tom Yu <tlyu@MIT.EDU>
References: <tsl63gl7ujg.fsf@mit.edu> <ldvljpg8p1o.fsf@cathode-dark-space.mit.edu>
From: Sam Hartman <hartmans-ietf@mit.edu>
Date: Mon, 04 May 2009 15:22:11 -0400
In-Reply-To: <ldvljpg8p1o.fsf@cathode-dark-space.mit.edu> (Tom Yu's message of "Fri\, 01 May 2009 17\:57\:07 -0400")
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Cc: ietf-krb-wg@anl.gov, Sam Hartman <hartmans-ietf@mit.edu>
Subject: Re: [Ietf-krb-wg] CF2 test vectors for DES and 3DES
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>>>>> "Tom" == Tom Yu <tlyu@MIT.EDU> writes:

    Tom> Sam Hartman <hartmans-ietf@MIT.EDU> writes:
    >> Folks, there seems to be yet another inconsistency between RFC
    >> 3961 and MIT regarding DES and presumably 3DES random2key
    >> operations.
    >> 
    >> MIT assumes that DES random bit strings are 7 byte strings that
    >> are expanded with parity bits.  The RFC 3961 spec assumes that
    >> you take an eight byte string and do parity fix-up.

    Tom> Actually, spec assumes both.  RFC 3961 says des-cbc-md5 uses
    Tom> des_random_to_key, but des-cbc-md4 and des-cbc-crc use
    Tom> copy-8-bytes-and-fix-parity.  It does say that the key
    Tom> generation seed length is 8 bytes for all three, which is
    Tom> inconsistent with the use of des_random_to_key (which takes
    Tom> 56 bits as input).  I suspect a copy-and-paste error.

OK, but the MIT code is still inconsistent with the spec.
We seem to do the same for all the DES enctypes.
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