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Date: Fri, 18 Jul 2014 03:22:26 +0200
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: CUDA Test Results on ARM w/CUDA

2014-07-17 23:59 GMT+02:00 Pyrex <pyrex@...networks.net>:

>  ./john --device=0 -test --format=*-cuda
> modprobe: FATAL: Module nvidia not found.
> Benchmarking: md5crypt-cuda, crypt(3) $1$ [MD5 CUDA]... FAILED
> (get_hash[0](244))
>
>
For some reason this format fails with sm_20 and grater when password is
empty.
I was able to replicate this bug on our GTX570.
A temporary workaround would be commenting out those two lines in
cuda_cryptmd5_fmt.c:

//      {"$1$$qRPK7m23GJusamGpoGLby/", ""},
//      {"$1$12345678$xek.CpjQUVgdf/P2N9KQf/", ""},

After recompilation you should be able to run self test:

$ ./john -test -format=md5crypt-cuda
Benchmarking: md5crypt-cuda, crypt(3) $1$ [MD5 CUDA]... DONE
Raw: 67200 c/s real, 67200 c/s virtual


And slightly improve it further by modification of THREAD, BLOCKS settings
in cuda_cryptmd5.h:
#define BLOCKS 128
#define THREADS 256

$ ./john -test -format=md5crypt-cuda
Benchmarking: md5crypt-cuda, crypt(3) $1$ [MD5 CUDA]... DONE
Raw: 67795 c/s real, 67795 c/s virtual

That's all for today.

Lukas

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