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Date: Sun, 10 Jan 2021 10:41:41 +0100
From: "Anton Berggren" <>
To: <>
Subject: Sv: Cracking rar password with rar-opencl

Thank you!
I solved the issue.
Upgraded Nvidia drivers and i noticed that nvopencl64.dll was changed. So i
just copied over the new one and woila it worked again.

Session completet with no passwords cracked.
Guess its time to try something else to this?

C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john --format=rar
--session=rockyou-cpu --wordlist=rockyou.txt rar.hashes
Using default input encoding: UTF-8
Loaded 1 password hash (rar, RAR3 [SHA1 256/256 AVX2 8x AES])
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
0g 0:05:12:16 34.25% (ETA: 09:51:33) 0g/s 269.9p/s 269.9c/s 269.9C/s
0g 0:08:47:41 54.93% (ETA: 10:40:20) 0g/s 250.8p/s 250.8c/s 250.8C/s
0g 0:15:32:09 DONE (2021-01-10 10:11) 0g/s 256.4p/s 256.4c/s 256.4C/s
Session completed

C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john --show rar.hashes
0 password hashes cracked, 1 left

I might just give up on this.


-----Ursprungligt meddelande-----
Från: Solar Designer <> 
Skickat: den 9 januari 2021 16:48
Ämne: Re: [john-users] Cracking rar password with rar-opencl

On Sat, Jan 09, 2021 at 04:38:18PM +0100, Anton Berggren wrote:
> Looks like my CPU is the only device being used now.
> In previous session my GPU was used. We determined that GPU had better 
> performance.
> C:\Users\Anton\Downloads\john-1.9.0-jumbo-1-win64\run>john
> --format=rar-opencl --session=rockyou --wordlist=rockyou.txt 
> rar.hashes Device 1: Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz

This suggests that something changed in your system setup.  By default, JtR
uses what it thinks is likely the fastest OpenCL device, and perhaps it was
correctly choosing your NVIDIA GPU before.  If it doesn't do that now, then
perhaps your NVIDIA GPU is somehow not available now - e.g., uninstalled
driver or something.

If you continue with using the CPU, then you'd probably get slightly better
speeds by not using OpenCL.


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