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Date: Sat, 11 Apr 2015 21:05:49 +0200
From: Agnieszka Bielec <>
Subject: Re: [GSoC] John the Ripper support for PHC finalists

2015-04-11 20:02 GMT+02:00 magnum <>:
> On 2015-04-11 16:39, Solar Designer wrote:
>> 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?
> RAR5 might be a clean base. Many of the other ones support vectorizing
> (decided at run-time) so are somewhat more complex (although that might
> be interesting for Pomelo too?). I suspect some of Claudio's formats
> might be a good start too, I haven't looked much at them as he actively
> maintains them himself.

you mean only opencl version?
or also non-opencl?


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