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Date: Tue, 01 Feb 2011 09:52:24 +0100
From: Simon <>
Subject: Re: FreeBSD crypt() / MD5-crypt implementation question

On 31/01/2011 23:41, Freddie Witherden wrote:
> Interesting, as I've found it to perform quite a bit worse than BarsWF.
>  In the MD5 code I've been poking about with (which is--essentially--the
> same as that in JtR) around ~4% can be gained from 0 input optimisation
> for inputs less than 224-bits.  This is similar to what BarsWF does,
> although far less aggressive, given that MD5 crypt strings tend to be
> longer.

It is possible I had my measurements totally wrong. Barswf does the
"reverse the last rounds" optimization, but not my code, and my idea of
its performance is based on a computation of the per round efficiency.
Also it only works properly with ICC, but I'm sure this is obvious.

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