Date: Sat, 7 Jul 2012 06:23:21 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: RAR's SHA-1 speed on GPU magnum - Do you know how many times the SHA-1 compression function is invoked (on average?) per the 256k rounds of the loop in rar_kernel.cl, for the test vectors that we're currently using? In other words, how many SHA-1s per second do our current c/s rates for RAR translate to? Of course, there's lots of other "overhead" besides SHA-1 involved, but I am curious nevertheless. I naively thought that we had SHA-1 on every iteration, but this doesn't appear to be the case, or the speed on GTX 570 would be unbelievably high (only 8 clock cycles per SHA-1 round, which would be too good given the lack of rotates and bit selects on NVIDIA). Alexander
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