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Date: Wed, 12 Mar 2014 20:10:32 +0000
From: <>
To: "" <>
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?



On 2014-03-12 19:44:26 wrote:
> On 2014-03-12 19:51, 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

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