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Message-ID: <defc5ecc-de1a-760e-3eea-6241784d55e3@openwall.net>
Date: Fri, 26 Aug 2016 13:45:44 -0500
From: jfoug <jfoug@...nwall.net>
To: john-dev@...ts.openwall.com
Subject: Re: Re: GPU-side mask mode
On 8/26/2016 1:28 PM, magnum wrote:
>
>> Is there a way to make this into a module (like we have done with SIMD
>> code), so that it does not have to be hooked so deeply into the format's
>> kernel code? There would still be some interface code (like we have
>> with SIMD), but the main functionality is external.
>
> Yes but it's currently an enormeous amount of code all over the
> CPU-side format. It needs a LOT of work. Ideally we should just call
> some shared function from reset(), and some other function from
> crypt_all() (and so on) and be done with it.
>
> On kernel side, things are much better. It's the host code that knocks
> me cold.
It's good that the 'kernel' side is 'cleaner' and somewhat modular. I
agree with you on the location of the CPU hooking code. So if the code
could be made more 'generic' (with no loss of speed), then simply
changing a few lines in those 2 CPU-side format functions and adding
whatever kernel hooks are needed, and any format would get the benefits
of GPU masking. That was my questions. It would be a HELL of a lot
easier to do this now, than to hammer out a dozen more format, and then
have to decouple all of those. Just think of having to decouple 50
formats that have SIMD code intertwined (like some of the -ng formats).
It would really slow down enhancements or usage of the SIMD stuff. Yes,
the SIMD callable code is not 100% the fastest always, but it is pretty
darn close, AND is pretty trivial to simply hook it into a format.
>
>> I am sending this offlist, as I do not want to pollute your thread IF
>> this is total PEBCAK
>
> No you didn't :-) But this is a good discussion here.
I saw that the moment I clicked send, that I had not changed the 'to:'
value, lol. Oh well, I would have brought it to list anyway, once I saw
it was not 100% PEBCAK.
Jim.
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