Date: Wed, 3 Feb 2016 21:39:19 +0100 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Subject: Re: Doing raw SHA512 hashes On 2016-02-02 23:49, Frank Wang wrote: > I am trying to run about 10 million raw SHA 512 hashes in my program and > offloading it to a GPU will make it substantially faster. It seems like > John the Ripper has this functionality, but it seems to be intertwined with > the password cracking capabilities. Are there any SHA 512 OpenCL > implementations that are easy to separate and integrate into my program? > Possibly that already exist in John the Ripper? I would think so. Our current GitHub code contains (among other implementations) generic SHA512 macros in src/opencl_sha512.h which is then used in src/opencl/office2013_kernel.cl and src/opencl/pbkdf2_hmac_sha512_kernel.cl. These are raw single-block functions though, for performance reasons. Perhaps you need to hash data longer than 112 bytes, eg. with generic "init-update-finish" style functions? I don't think we have any such thing for OpenCL SHA512 right now but it's easily accomplished with generic Merkel-Damgard wrappers. If you know that stuff it's easy. magnum
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