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Message-ID: <CAK_fNXQPBn5VTBeBgNqhTYMPBPUpt2LpL10AyDaPvU37ZO-EQA@mail.gmail.com>
Date: Fri, 4 Sep 2020 01:18:56 +0200
From: Axymeus <axymeus@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: rar-opencl performance
cRARk goes up to 20K p/s on this archive. Here's cRARk output if it helps.
OpenCL device #0 GeForce RTX 2070 SUPER found, 1800 MHz, 2560 SP
cores, GPU rate = 17.60
Trying to compile FAST NVIDIA OpenCL kernel. Please wait... Successfully.
Running self-test... Successfully
Choosing best crypto functions.........
Chosen: AVX2, AVX, AVX2 (-f368), AES-NI
Clock cycles per password expected = 3698751(SIMD)/15160877 (x64) (*),
theoretical = 21172752
Calculating pure SHA-1 clock cycles...
Pure SHA-1 clock cycles per byte expected = 0.8 (SIMD)/2.7 (x64) (*),
theoretical = 4.3
Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz found, CPU rate = 6.06 (*)
(*) May be inaccurate if Turbo Boost is on
On Fri, Sep 4, 2020 at 1:11 AM Solar Designer <solar@...nwall.com> wrote:
>
> On Fri, Sep 04, 2020 at 12:51:24AM +0200, Axymeus wrote:
> > As you can see the performance is only marginally better in phase 3
> [...]
> > Proceeding with incremental:ASCII
> > 0g 0:00:04:48 3/3 0g/s 1220p/s 1220c/s 1220C/s jaith..murtos
> > 0g 0:00:05:32 3/3 0g/s 1183p/s 1183c/s 1183C/s bakku..mysey
> > 0g 0:00:06:24 3/3 0g/s 1183p/s 1183c/s 1183C/s saluke..mynen1
> > 0g 0:00:08:06 3/3 0g/s 1145p/s 1145c/s 1145C/s bordaku..miamm1
> > Session aborted
> >
> > However running rar-opencl with -test gives... 46704 c/s real, 46811
> > c/s virtual (Benchmarking: rar-opencl, RAR3 (length 5) [SHA1 OpenCL
> > AES]... (12xOMP))
>
> OK. Then I suspect it's the specifics of your RAR archive and/or
> storage method (compressed or not) of the file inside archive that's
> being attacked. In some cases, the whole data needs to be decrypted or
> even uncompressed before a candidate password can be rejected. This is
> done on CPU, which is why the GPU load would be low.
>
> What performance are you getting when using cRARk on this archive?
>
> Alexander
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