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Date: Tue, 5 Jun 2012 00:48:49 +0200
From: Lukas Odzioba <>
Subject: Re: Re: john.conf options subsections (was: john-users)

2012/6/4 magnum <>:
> On 06/02/2012 12:25 AM, Lukas Odzioba wrote:
>> Could you please tell me how these OpenCL settings are used in code?
>> Or where I can find usage example?
>> I wanted to move all my KEYS_PER_CRYPT to common-opencl.h. But moving
>> it co john.conf seems to be better idea.
> This is very easy. Here's a simplified snippet from rar_fmt:
> #include "config.h"
> ...
>        global_work_size = some default;
>        char *temp;
> ...
>        if ((temp = cfg_get_param(SECTION_OPTIONS, SUBSECTION_OPENCL,
> "rar_KPC")))
>                global_work_size = atoi(temp);
>        if ((temp = getenv("KPC")))
>                global_work_size = atoi(temp);
> In this example, the environment variable KPC will override the john.conf
> entry if set. Here I used cfg_get_param which reads a string but there is
> also a cfg_get_int() that reads an integer and a cfg_get_bool() that reads
> true/yes/false/no and returns a bool (int). The latter has a default too:
> Look at the prototypes in config.h.
> SECTION_OPTIONS is just "Options". SUBSECTION_OPENCL is ":OpenCL" thus the
> entry "rar_KPC" will be read from [Options:OpenCL]. You can use whatever
> section and subsection you want to with no more code than the above.
>> P.S. We should get rid of KPC :)
> Do you mean in favor of GWS?

Thank you for all of these specific informations. I like this solution a lot.


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