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

Tom Yu <tlyu@MIT.EDU> Fri, 01 May 2009 21:58 UTC

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To: Sam Hartman <hartmans-ietf@mit.edu>
References: <tsl63gl7ujg.fsf@mit.edu>
From: Tom Yu <tlyu@MIT.EDU>
Date: Fri, 01 May 2009 17:57:07 -0400
In-Reply-To: <tsl63gl7ujg.fsf@mit.edu> (Sam Hartman's message of "Thu, 30 Apr 2009 16:31:31 -0400")
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Cc: ietf-krb-wg@anl.gov
Subject: Re: [Ietf-krb-wg] CF2 test vectors for DES and 3DES
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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.

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