Date: Thu, 16 May 2013 14:09:54 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: password generation on GPU On 16 May, 2013, at 13:28 , Solar Designer <solar@...nwall.com> wrote: > On Thu, May 16, 2013 at 12:48:50PM +0530, Sayantan Datta wrote: >> In this implementation of mask-mode the key is generated outside the >> format. However in the PG-test branch we were generating the keys inside >> the format using GPU . So how do I start implementing the mask mode? Should >> we generate the keys globally outside the format using a GPU ? > > Oh, at first I misread what you wrote above. You're asking not whether > to generate keys on host vs. GPU (the short answer to which is that we > should do both of these things), but whether to do the GPU portion of > key generation inside the format or with code shared between formats. > So far, we only considered doing it from the same kernels that do the > crypto, so we'd have duplicate implementations of the GPU side of mask > mode (one for each fast hash format). I think that for mask mode this > is in fact what we should be doing, and those duplicate implementations > will end up having enough format-specific optimizations for the code > "duplication" to be worth it. (Ditto for code responsible for comparing > computed vs. loaded hashes, using bitmaps and such.) We may also have > generic implementation(s) (or portions thereof), to be #include'd from > multiple per-format OpenCL kernels. Using separate kernels (with > communication via global memory?) is likely slower. A kernel can call another kernel iirc so it might not be too bad. Maybe try it out? It could simplify shared use. magnum
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