Date: Thu, 8 Oct 2015 00:33:44 +0200 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Cc: Roman Rusakov <rusakovster@...il.com>, deeplearningjohndoe@...il.com Subject: Re: nVidia Maxwell support (especially descrypt)? On 2015-10-07 23:37, Solar Designer wrote: > DeepLearningJohnDoe - thank you for your work in this area, and we'd > appreciate any comments you might have on the below. > > On Wed, Oct 07, 2015 at 06:54:20PM +0200, magnum wrote: >>> On Wed, Oct 7, 2015 at 8:44 AM, Solar Designer <solar@...nwall.com> wrote: >>>> And of course we'll also need to include some LOP3.LUT S-boxes. >>>> If Roman's are still unreleased (except for S4), then Janet's. > [...] >> I implemeted this in 9c82bcc, using DeepLearningJohnDoes's (a.k.a >> Janet's) S-boxes except for s4. > > Are you getting better speeds with Roman's S4? I couldn't spot any difference - I used it just on principle, for the lower gate count :-) > BTW, our current opencl_sboxes.h defaults to using nonstd.c derived > expressions when !HAVE_LUT3. Maybe it should also have an option for > using sboxes-s.c derived expressions, which are supposed to be faster on > AMD GPUs. Those files also need a general clean-up. They are hard to follow. I don't want to mess too much with them since Sayantan "owns" them but they contain large sections of commented-out stuff, CPU-specific stuff and so on. >> BTW we now also use LOP3.LUT for many MD4, MD5 and SHA-2 OpenCL formats. >> Some driver bug prevented me for using it in SHA-1 with nvidia 352.39 >> (the code is there, just disabled) and md5crypt disable it because of >> performance regression (still to be investigated). Some formats show a >> fine boost but none as much as DEScrypt. > > ... with our guess on why lower boost being that LOP3.LUT was often > used anyway, introduced in the PTX to ISA translation. Right - actually I did not expect any boost, I just did it because I could. But I'm puzzled by the md5crypt regression, and the SHA-1 problem (fails self-test). Perhaps the latter should be reported to nvidia, I think they would actually look into it. magnum
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