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Date: Tue, 3 Sep 2013 15:47:25 +0200
From: Dániel Bali <>
Subject: Re: Daniel's weekly report #12


2013/9/3 Solar Designer <>
> Ouch.
> My impression from your recent weekly reports is that the primary issue
> you bumped into was with LDS usage, and we need LDS both for bcrypt and
> for the 64-bit addition instruction that we could use for SHA-512.  Is
> this right?
> If so, how about we temporarily switch focus from actually producing
> faster code to producing any working JtR format that would use some GCN
> asm code, even if it's not faster (not even potentially) than code we
> already have?  This could be something simple and ridiculous, like
> CRC-32 - just as a sample, to let someone else continue with the project,
> and potentially do so in JtR context.  In fact, once you have CRC-32 as
> a JtR format written using GCN asm, maybe you'd be able to proceed with
> e.g. raw MD5 while still avoiding the LDS issue (although indeed we'd
> need to solve that problem sooner or later)?
> Does this unblock your work now?

Thank you for your answer.
Yes this is a route that I could take.

CRC-32 could work. One question: what do you mean by CRC-32 as a JtR format?
Would this have to run inside the JtR "framework"?


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