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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