Date: Tue, 17 Jul 2012 22:16:48 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Keychain format OpenCL implementation, please review On Tue, Jul 17, 2012 at 10:02:05PM +0530, Dhiru Kholia wrote: > I have implemented Keychain format using OpenCL. Apply attached patch > to magnum-jumbo branch for testing. This is very nice. Thank you! (No, I haven't tested it yet.) > Speed is 132K c/s on ATI 6970. It is roughly 300x faster than > single-core CPU version (AMD X3 720). Hopefully, I haven't screwed > things up ;) I guess this means that your CPU code is a lot slower than it can/should be. ;-) And your 140K c/s figure for 7970 (mentioned elsewhere) suggests that you might still be spending much time in CPU code, which is why changing the GPU makes little difference. IIRC, this is PBKDF2-HMAC-SHA-1 with 1000 iterations producing a 3DES key, right? If so, I think that's roughly the same as 2000 iterations (since SHA-1's output size is not enough for a 168/192-bit 3DES key as-is). For MSCash2, we have 10240 iterations. So you should have 5 times higher speed, or about 500k c/s on 7970. Also, I notice that your code does not use bitselect() and rotate() yet - see the kernel we use for MSCash2 and merge those changes. Thanks again, Alexander
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