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Date: Thu, 19 Apr 2012 15:14:44 -0300
From: Claudio André <claudioandre.br@...il.com>
To: john-dev@...ts.openwall.com
Subject: Format readme?

/Hi, i was thinking about an explanation about the format. See below an 
idea.

Do you guys have a place where it makes sense?

---- (formatted text)
John can crack SHA-512 on OpenCL enabled devices. To use it, try:/

  * john --format=/*cryptsha512-opencl*///[other options]//


/The maximum password lenght is: 16 bytes./
/The maximum salt lenght is: 16 bytes./

/In order to change these limits, anyone can open the 
opencl_cryptsha512.h, modify statements seen below and recompile the 
project.//Note that some memory mis-alignment could lead to wrong 
computation results./
/#define SALT_SIZE 16 /
/#define PLAINTEXT_LENGTH 16/

 1. /This software was tested using, basically:/

  * /Radeon HD 6770 (Juniper)/
  * /AMD Phenom(tm) II X6 1075T Processor/
  * /SDK 2.6 OpenCL 1.1 AMD-APP (898.1)/
  * /Catalyst 12.2/
  * 8.95-120214a-134397C-ATI
  * /Ubuntu 11.10 x86_64/

    /Not sure how it will behave under different hardware and software
    conditions. See more information at /http://www.golubev.com/blog/?p=223

 2. /Pay special attention to how the work is going to be
    divided/organized. It means that some time should be //spent //to
    select the work-group size and the threads number (LWS and KPC sizes)./

 3. /The source code seems to be better suited to Southern Islands
    products. See section 4.16 in Optimization Guidelines for Southern
    Islands GPUs [1]./


/[1] -- //link 
<http://developer.amd.com/sdks/amdappsdk/assets/AMD_Accelerated_Parallel_Processing_OpenCL_Programming_Guide.pdf>//, 
visited in 04/19/2012./

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