Date: Thu, 29 Mar 2012 04:07:05 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: JtR: GPU for slow hashes On Wed, Mar 28, 2012 at 11:21:50PM +0530, SAYANTAN DATTA wrote: > On Wed, Mar 28, 2012 at 5:54 PM, SAYANTAN DATTA <std2048@...il.com> wrote: > > Here are a few problems I'm facing.Since ATI 4000 series gpus don't > > support byte_addressable_store I have to work around this problem by using > > only uint as the data type for temporary data storage.This problem exsist > > with many of the hash algorithms already implemented with openCL eg MD5,4 > > etc.However ATI 5000 series and above seems to support > > byte_addressable_store.So the exsisting codes should work fine on 5000 or > > above GPUs but for 4000 series or below they need to be reimplemented.The > > workaround is also causing some performance penalties. ... > Since my GPU dosen't support byte_addressable_store it is becoming an > increasingly uphill task to implement the HMAC_SHA1 algorithm.Using the > uint instead of uchar is a probable solution but debugging the > code becomes very much time consuming. > I have also considered using 4 uchar16 vectors to replace single > uchar array but it is resulting in too much branching in the code.If > you have any suggestion please let me know. I am totally unfamiliar with this - maybe someone else will comment. Lukas, Milen, Samuele, Claudio, magnum - maybe some of you? It is not necessarily a bad thing that the task turned out to be more complicated - you have a better chance to demonstrate your ability to work on complex tasks in this way. ;-) Thanks, Alexander
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