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Date: Mon, 4 Jan 2021 11:55:52 +0100
From: "Anton Berggren" <antonb@...e.se>
To: <john-users@...ts.openwall.com>
Subject: Cracking rar password with rar-opencl
Hi!
Im trying to crack a rar password and i want to use all available resources
on my computer.
C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john
--list=opencl-devices
Platform #0 name: Intel(R) OpenCL, version: OpenCL 1.2
Device #0 (1) name: Intel(R) HD Graphics 4600
Device vendor: Intel(R) Corporation
Device type: GPU (LE)
Device version: OpenCL 1.2
Driver version: 20.19.15.5166
Native vector widths: char 1, short 1, int 1, long 1
Preferred vector width: char 1, short 1, int 1, long 1
Global Memory: 1629 MB
Global Memory Cache: 256 KB
Local Memory: 64 KB (Local)
Constant Buffer size: 64 KB
Max memory alloc. size: 407 MB
Max clock (MHz): 1200
Profiling timer res.: 80 ns
Max Work Group Size: 512
Parallel compute cores: 20
Stream processors: 160 (20 x 8)
Speed index: 192000
Device #1 (2) name: Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz
Device vendor: Intel(R) Corporation
Device type: CPU (LE)
Device version: OpenCL 1.2 (Build 10094)
Driver version: 5.2.0.10094
Native vector widths: char 32, short 16, int 8, long 4
Preferred vector width: char 1, short 1, int 1, long 1
Global Memory: 16252 MB
Global Memory Cache: 256 KB
Local Memory: 32 KB (Global)
Constant Buffer size: 128 KB
Max memory alloc. size: 4063 MB
Max clock (MHz): 3400
Profiling timer res.: 100 ns
Max Work Group Size: 8192
Parallel compute cores: 4
Speed index: 54400
Platform #1 name: NVIDIA CUDA, version: OpenCL 1.2 CUDA 11.2.66
Device #0 (3) name: GeForce GTX 760
Device vendor: NVIDIA Corporation
Device type: GPU (LE)
Device version: OpenCL 1.2 CUDA
Driver version: 460.89 [recommended]
Native vector widths: char 1, short 1, int 1, long 1
Preferred vector width: char 1, short 1, int 1, long 1
Global Memory: 2 GB
Global Memory Cache: 96 KB
Local Memory: 48 KB (Local)
Constant Buffer size: 64 KB
Max memory alloc. size: 512 MB
Max clock (MHz): 1150
Profiling timer res.: 1000 ns
Max Work Group Size: 1024
Parallel compute cores: 6
CUDA cores: 1152 (6 x 192)
Speed index: 1324800
Warp size: 32
Max. GPRs/work-group: 65536
Kernel exec. timeout: yes
PCI device topology: 01:00.0
And i resume with this command and get the output
C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john --restore
Device 3: GeForce GTX 760
Loaded 1 password hash (rar-opencl, RAR3 [SHA1 OpenCL AES])
Will run 4 OpenMP threads
Proceeding with incremental:ASCII
Press 'q' or Ctrl-C to abort, almost any other key for status
Is it only using my Nvidia GPU? How can i utilize all my decices? Can i
optimize my rar password cracking for a more effective usage?
It seems that my GPU usage isnt constant. It goes up and down.. up and
down.. up and down... about 10-30%. That is what windows reports anyway.
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