Date: Thu, 1 Nov 2012 13:58:35 +0530 From: Sayantan Datta <std2048@...il.com> To: john-dev@...ts.openwall.com Subject: Re: DES bitslice sboxs for GPUs (not AMD) Hi alain, On Thu, Nov 1, 2012 at 9:41 AM, Alain Espinosa <alainesp@...il.com> wrote: > The sboxs in src/nonstd.c contains ANDN instructions that are not > available in GPUs (if i read and understood the documentation). Of > course we can convert ANDN to a AND plus a NOT, but i guess there are > optimized sboxs without ANDN. > I'm not sure but I don't think there are any other sboxes other than these two for DES. If the GPUs don't have andn instruction then the compiler is probably doing the same AND + NOT but that may not be using least number of instructions. So optimizing might involve a lot of boolean manipulations. Regards, Sayantan Content of type "text/html" skipped
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