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

Sam Hartman <hartmans-ietf@mit.edu> Thu, 30 April 2009 21:44 UTC

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To: Jeffrey Hutzelman <jhutz@cmu.edu>
References: <tsl63gl7ujg.fsf@mit.edu> <DECAF6353ABA73BEB076C48B@minbar.fac.cs.cmu.edu>
From: Sam Hartman <hartmans-ietf@mit.edu>
Date: Thu, 30 Apr 2009 17:45:44 -0400
In-Reply-To: <DECAF6353ABA73BEB076C48B@minbar.fac.cs.cmu.edu> (Jeffrey Hutzelman's message of "Thu\, 30 Apr 2009 17\:27\:52 -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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>>>>> "Jeffrey" == Jeffrey Hutzelman <jhutz@cmu.edu> writes:

    Jeffrey> --On Thursday, April 30, 2009 04:31:31 PM -0400 Sam
    Jeffrey> Hartman
    Jeffrey> <hartmans-ietf@mit.edu> wrote:

> 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.

    Jeffrey> I think this is an API issue.  The 3961 random-to-key
    Jeffrey> operation is defined in terms of an input bitstring of a
    Jeffrey> particular size.  For single-DES, the last paragraph
    Jeffrey> before 6.2.1 says...

No.  I'm fairly sure it produces different results with CF2.
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