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Date: Fri, 14 Jun 2019 11:11:16 -0400
Subject: Re: Unable to use OpenCL on arm64v8/debian stretch

> > ../run/john --test --format=wpapsk-opencl
> > Device 1@...i: Mali-T860
> > Benchmarking: wpapsk-opencl, WPA/WPA2/PMF/PMKID PSK [PBKDF2-SHA1 OpenCL]... 0: OpenCL CL_INVALID_PROGRAM_EXECUTABLE (-45) error in opencl_wpapsk_fmt_plug.c:270 - Error creating kernel
> Line 270 points at the run-time GPU build of WPA2/802.11w final kernel. 
> Before this error, your system successfully built six other WPA kernels,

What do you mean by "your system successfully built six other WPA kernels" and how do know?
How can I revert to an earlier kernel?
Where does the kernel reside?
I ask the last question b/c perhaps I can retrieve/derive it from my Rock64's packages (where pocl functions for the CPU).

> so again it looks like there's no general problem with your installation 
> but likely some runtime/driver bug that surfaces with this particular 
> 7th kernel (which is a straight-forward kernel just involving SHA-256 
> and AES-CMAC).
> On a side note, what's the speed of the CPU format given just "--test 
> --format=wpapsk" instead?

../run/john --test --format=wpapsk
Will run 6 OpenMP threads
Benchmarking: wpapsk, WPA/WPA2/PMF/PMKID PSK [PBKDF2-SHA1 128/128 ASIMD 4x]... (6xOMP) DONE
Speed for cost 1 (key version [0:PMKID 1:WPA 2:WPA2 3:802.11w]) of 2
Raw:	1317 c/s real, 292 c/s virtual

> Judging from the speed you got from 
> sha1crypt-opencl, I doubt your GPU will be of much help cracking WPA 
> (and BTW what's the speed of CPU sha1crypt?).

       Yeah, looks that way.
       Exactly double that of the GPU.
../run/john --test --format=sha1crypt
Will run 6 OpenMP threads
Benchmarking: sha1crypt, NetBSD's sha1crypt [PBKDF1-SHA1 128/128 ASIMD 4x]... (6xOMP) DONE
Speed for cost 1 (iteration count) of 64000 and 40000
Raw:	234 c/s real, 48.1 c/s virtual

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