Date: Sat, 11 Apr 2015 20:02:16 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] John the Ripper support for PHC finalists 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. magnum
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