Date: Tue, 4 Dec 2012 10:45:09 +0530 From: Sayantan Datta <std2048@...il.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU On Fri, Oct 19, 2012 at 2:01 AM, Solar Designer <solar@...nwall.com> wrote: > > > Since the 96 index array is almost constant the indexing could be > > done prior to execution. However it might require some radical approach > > like pre compiling the kernels manually. > > Yes, or patching binary kernels at runtime. This is something I had in > mind before we started. I previously tested this on CPU, for a 7% > speedup over what we currently have in JtR. On GPU, the speedup will > likely be much greater. You may measure it by temporarily (in a copy of > the code) eliminating E and hard-coding the indices for a certain salt > value (it is easiest to do this for salt=0 - just take the indices out > of the LM hash code and use the test hash with ".." for the salt). > > Alexander > Did that. Performance increased from 67M to 110M using the zeroed salt with 2501 iterations on 7970. Content of type "text/html" skipped
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