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Date: Sat, 11 Apr 2015 17:39:54 +0300
From: Solar Designer <>
Subject: Re: [GSoC] John the Ripper support for PHC finalists

On Thu, Apr 09, 2015 at 06:34:26PM +0200, magnum wrote:
> md5crypt (opencl_cryptmd5_fmt_plug.c) would be an excellent base for a
> single-kernel format. Is there any chance Pomelo would benefit from a
> split/loop kernel?

Definitely.  PHC finalists are expected to often be tuned to defensive
running times of 100 ms or more (including multiple seconds), and this
may be many seconds of latency on GPUs with their high concurrency and
lower clock rates.

We'll use lower cost settings when determining the CPU/GPU parity
thresholds, which is one of the goals of this projects, but other than
that the formats should work for high cost settings as well.

So perhaps opencl_cryptmd5_fmt_plug.c isn't a good long-term choice to
use as a base for these new formats, although it'd probably work for our
initial experiments and it may be simpler.

magnum, what base format would you suggest for a new split kernel format?


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