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Date: Sat, 25 Apr 2015 23:53:15 +0200
From: Agnieszka Bielec <>
Subject: Re: [GSoC] John the Ripper support for PHC finalists

2015-04-25 23:33 GMT+02:00 Solar Designer <>:
> On Sun, Apr 26, 2015 at 12:31:49AM +0300, Solar Designer wrote:
>> On Sat, Apr 25, 2015 at 10:28:31PM +0200, Agnieszka Bielec wrote:
>> > 2015-04-25 21:20 GMT+02:00 Solar Designer <>:
>> > > "4 GPU units" sounded weird and confusing to me.
>> > > If you put a hash of a known password in a text file, and put the
>> > > password somewhere down a wordlist, and run "john" with pomelo-opencl
>> > > against that, will it crack the hash?
>> >
>> > It works
>> Can you explain how/why it works?  I am probably missing something.
>> I would expect it to fail most of the time.
> Oh, maybe it happens to work precisely because those 4 work-items tend
> to be part of the same SIMD vector in hardware, so with current OpenCL
> drivers they happen to be "guaranteed" to be ready at the same time?

Did you mean CPU, not GPU?? Sorry I forgot to mention that it works on
GPU because instructions are executed at the same time but this fails
on CPU.
I was focused only on GPU because coalescing decreased the speed on
CPU significantly and if somebody want opencl on CPU they should use a
old version

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