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Message-ID: <1b456f312ffcce187adc234368ccd1a3374@guerrillamail.com> Date: Wed, 12 Mar 2014 20:10:32 +0000 From: <dy3afg9+halwpc@...rrillamail.com> To: "john-users@...ts.openwall.com" <john-users@...ts.openwall.com> Subject: Re: Re: pbkdf2-hmac-sha512 on GPU Hi, and thanks for your help. I'm building for OSX 10.9, build target: macosx-x86-64-opencl. As far as I know the number of iterations vary, it's in the 10's of thousands for sure. JTR terminal output: Loaded 1 password hash (PBKDF2-HMAC-SHA512, GRUB2 / OS X 10.8+ [PBKDF2-SHA512 128/128 SSSE3 2x]) How would I go about trying Lukas' experimental build? This? https://github.com/ukasz/graveyard Thanks, Joe. On 2014-03-12 19:44:26 john.magnum@...hmail.com wrote: > On 2014-03-12 19:51, dy3afg9+halwpc@...rrillamail.com wrote: > > Is it at all possible to crack pbkdf2-hmac-sha512 on GPU, specifically, > openCL? > > > > I’ve compiled the bleeding-jumbo from github which doesn’t appear to > have pbkdf2-hmac-sha512-opencl as an option, yet pbkdf2-hmac-sha256-opencl > is. > > > > On CPU, I’m getting around 20C/s with fork set to 8 (quad core 3.7ghz > Xeon) > > > > If anyone could help speed up the process for this hash format it would > be much appreciated. > > Joe. > > It is basically trivial but there's nothing committed. Lukas might have > an experimental one. GPUs usually have a hard time with SHA-512 though, > more bugs than usual use to surface whenever 64-bit stuff are used. > Perhaps a CUDA kernel for this would be better as a first version - any > old CUDA driver is usually a couple orders of magnitude more stable than > whatever run of the mill AMD driver. > > What build target did you use? Using the --test benchmark I get 228 c/s > on my 2.3 GHz laptop using OMP, or 240 c/s with fork=4. Maybe your > reported speed was for some IRL hash(es) with a higher iteration count? > > magnum ---- Sent using GuerrillMail.com Block or report abuse: https://www.guerrillamail.com/abuse/?a=S058C0AVULEHmy64%2BW0LYVrIXc%2BexdZcy%2BpBc9I%3D
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