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Date: Thu, 11 Sep 2014 09:54:39 +0200
From: magnum <>
Subject: Re: nVidia Maxwell support (especially descrypt)?

On 2014-09-11 09:02, Royce Williams wrote:
> Because of the $150 price and relatively low power requirements (~60W,
> no extra power connector needed) of the new nvidia Maxwell (GTX 750
> and 750 Ti) cards, and my own interest in descrypt, I'm interested in
> seeing JtR take advantage of Maxwell if feasible.

As long as you have OpenCL drivers for it, it's supposed to work and any 
device-specific problems would be a bug (albeit not always "our" bug, I 
recently worked around some really silly bugs in latest AMD drivers).

> I know that descrypt isn't exactly the hottest topic, but it might be
> easy to use it as a Maxwell test case.

BTW I just dropped the DEScrypt-opencl format to the broken/ 
subdirectory because it keeps giving me problems. For example, it fails 
building under later AMD drivers due to excessive use of 'goto'. Some 
other drivers commit suic^Wsegfault while trying to sort it out. I 
believe using goto in an OpenCL kernel is really begging for problems.

To use it, simply move the files back from src/broken to src, 
reconfigure and re-build. I hope Sayantan will fix it (as well as the 
memory leak discussed before) at some point in time.


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