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 ./ / -- //link <http://developer.amd.com/sdks/amdappsdk/assets/AMD_Accelerated_Parallel_Processing_OpenCL_Programming_Guide.pdf>//, visited in 04/19/2012./ Content of type "text/html" skipped
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