Date: Fri, 23 Mar 2012 15:19:46 +0100 From: Samuele Giovanni Tonon <samu@...uxasylum.net> To: john-dev@...ts.openwall.com Subject: Re: OpenCL formats write-buffer optimisations On 03/22/12 22:45, magnum wrote: > Samuele, > > Could you take a look at commit 7c8dcdb and see if you agree with it? Actually i think it's a good idea, i wish i could have think of thay myself too :-) > I'm not sure there's much of a boost but there is no downside. This > general approach should be considered for all formats. Never do anything > not needed :) > > The opposite case, many salts, could be optimised too. In this case, > john will do this: > > set_salt() > set_key() (millions of times) > crypt_all() > set_salt() > crypt_all() (using same keys) > set_salt() > ... > > In this case we should avoid re-transferring the keys as they are > already there. This might be a noticable boost on systems with slow > transfer as the key buffer is a lot larger. One way to achive this is > something like the enclosed patch (untested on GPU as of yet). All > salted formats could/should do something like this. yes i totally agree: it's the same approach used on getting full hashes in cmp_exact and crypt_all . Cheers Samuele
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