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Date: Sun, 13 Sep 2015 18:54:07 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: experiment with functions to reject computed hashes

On 2015-09-13 18:35, Solar Designer wrote:
> On Sun, Sep 13, 2015 at 07:13:56PM +0300, Solar Designer wrote:
>> BTW, I think we might in fact want to revert
>> the non-iterated SHA-2 GPU formats to prior to Claudio's implementation
>> of hash comparisons on GPU, which mostly made things worse (way too slow
>> when cracking more than a handful of hashes - turned out to be unusably
>> slow in the recent contest).  myrice's implementations worked better
>> (and IIRC had no GPL restrictions on them too).
>
> I think we should at the very least re-introduce myrice's latest code as
> an alternative.  Until Claudio corrects the performance regression when
> cracking many hashes, this older code will run faster.  And when Claudio
> does correct the performance regression, this older code should still be
> kept for its relaxed license (and should be the basis for further
> enhancements for that reason).

I see we dropped Myrice's SHA-512 OpenCL formats (in favor of Claudio's) 
in Issue #676 because it had bugs and no maintainer. I can easily pull 
them back.

I can't see any SHA-256 from Myrice in our history though?

magnum

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