Date: Thu, 4 Jul 2013 14:46:55 +1000 From: Michael Samuel <mik@...net.net> To: john-dev@...ts.openwall.com Subject: Re: OpenCL PBKDFv2 Kernel With Python Hi Marcus, You probably don't want the OpenCL unless you're doing many at once - for a single password you'd be better off using a plain C version and using Cython to create a python module. For some example pyOpenCL code, look at https://github.com/therealmik/otpbreak/blob/master/create_otp_blocks.py - the basic concept is that you create a numpy.array with the correct dtype (numpy.uint32 = OpenCL uint, numpy.int32 = OpenCL int), then allocate a cl.Buffer(... hostbuf=myarray) which will copy it to the GPU. Of course, OpenCL has massive compile and launch overhead, so if you're doing this for anything other than cracking passwords, you probably want to go down the Cython path. Check out http://docs.cython.org/src/userguide/external_C_code.html Hope that helps, Michael
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.