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Message-ID: <CABh=JRGD0A2Qx4Wh+KQXRhmadsO6Z_nDZnS2JBv1pKsiJ-xrdA@mail.gmail.com>
Date: Fri, 17 Aug 2012 20:54:03 +0300
From: Milen Rangelov <gat3way@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: RAR early reject
On Fri, Aug 17, 2012 at 3:26 PM, magnum <john.magnum@...hmail.com> wrote:
> On 2012-08-17 09:19, Milen Rangelov wrote:
> > May I borrow it for my project?
>
> But of course! If you like you can send me a rar kernel I can get hints
> from, as a courtesy ;-) Doesn't need to be complete runnable code, just
> a kernel. I think my key stretching loop is the bottleneck.
>
Yeah, here it is, but I warn you, it's scary :)
http://www.gat3way.eu/poc/amd_rar.cl
I'm thinking I won't gain too much from doing more on GPU. My priority
> now (apart from more GPU speed) is splitting workload so each kernel run
> is 200 ms or so. Another possibility is firing off one batch on GPU and
> while that is running, compare the last and prepare the next.
I agree it won't make a big difference cause key derivation is the real
slow part, but there is still some performance gain from doing that.
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