Date: Mon, 21 Mar 2011 18:50:47 +0100 From: Samuele Giovanni Tonon <samu@...uxasylum.net> To: john-users@...ts.openwall.com Subject: Re: GSOC - GPU for hashes On 03/21/11 03:17, Łukasz Odzioba wrote: > 2011/3/19 Solar Designer <solar@...nwall.com>: >> Hi Lukas, >> > > Q8) Today i am going to library for Bruce Schneier's "Applied > Cryptography". Are there any good books related to the topic, which I > should look for? while that book is a must have to understand all the basic principles of cryptography if you just want to code for john i'd suggest you to take a deep look in to the hash algorithm, in to jtr how opencl and GPU's coding work. For example to learn how SHA1 works i started reading the algorithm on wikipedia http://en.wikipedia.org/wiki/Sha1 while at the same time looking for sample codes to see how it works. for opencl i suggest you to bookmark http://www.khronos.org/ i'm still reading it to understand how to really optimize opencl, even if at the moment i'm a bit tempted to try calpp and give it a try since it seems native code (cuda for nvidia and calpp for ati) gives 30% more speed to your code. There are some already some patches for opencl tough at the moment they are still experiments and far from being good but at least they works If you want i can give you in details the reasons for the rawSha1 and Nsldap-sha formats i did, what is working and what is troubling me at the moment. Regards Samuele
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