Date: Thu, 11 Sep 2014 07:18:54 -0800 From: Royce Williams <royce@...ho.org> To: john-users@...ts.openwall.com Subject: Re: nVidia Maxwell support (especially descrypt)? On Wed, Sep 10, 2014 at 11:54 PM, magnum <john.magnum@...hmail.com> wrote: > On 2014-09-11 09:02, Royce Williams wrote: >> >> Because of the $150 price and relatively low power requirements (~60W, >> no extra power connector needed) of the new nvidia Maxwell (GTX 750 >> and 750 Ti) cards, and my own interest in descrypt, I'm interested in >> seeing JtR take advantage of Maxwell if feasible. > > As long as you have OpenCL drivers for it, it's supposed to work and any > device-specific problems would be a bug (albeit not always "our" bug, I > recently worked around some really silly bugs in latest AMD drivers). To clarify for non-programmers like myself: is it up to the drivers, and not JtR's implementation, to take advantage of the features that Golubev gushes about? >From http://www.golubev.com/blog/?p=291, after a breakdown of code-specific changes he made: "Maxwell architecture is simply the best among all GPUs (And, yes, including AMD ones — because of constant problems with AMD’s buggy software making fast hardware pointless). At least for hashing/cryptography purposes." >> I know that descrypt isn't exactly the hottest topic, but it might be >> easy to use it as a Maxwell test case. > > BTW I just dropped the DEScrypt-opencl format to the broken/ subdirectory > because it keeps giving me problems. For example, it fails building under > later AMD drivers due to excessive use of 'goto'. Some other drivers commit > suic^Wsegfault while trying to sort it out. I believe using goto in an > OpenCL kernel is really begging for problems. > > To use it, simply move the files back from src/broken to src, reconfigure > and re-build. I hope Sayantan will fix it (as well as the memory leak > discussed before) at some point in time. Hmm ... I don't see any activity from Sayantan on the mailing lists since 2012, and his GitHub commits mostly died off a year ago: https://github.com/magnumripper/JohnTheRipper/commits?author=Sayantan2048 Royce
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