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Date: Tue, 19 Dec 2017 16:06:11 +0100
From: Solar Designer <>
Subject: Re: OpenMP

On Tue, Dec 19, 2017 at 01:33:56PM +0000, Mounir Belhniyene wrote:
> Thank you so much for your fast reply. Here is it the example of password
> cracking :
>$ ./zip2john
> ~/Desktop/ > ~/Desktop/doczip.hash
> ver 1.0 efh 5455 efh 7875>doc PKZIP Encr: 2b chk, TS_chk,
> cmplen=62, decmplen=50, crc=80ECEF18
>$ ./john ~/Desktop/doczip.hash
> Using default input encoding: UTF-8
> Loaded 1 password hash (PKZIP [32/64])
> Warning: OpenMP is disabled; a non-OpenMP build may be faster
> Press 'q' or Ctrl-C to abort, almost any other key for status

This output suggests you might be on a system that has only one logical
CPU.  Maybe a VM to which you didn't grant more than one logical CPU?

Also, the PKZIP format is a "fast" one, meaning that OpenMP scaling will
be poor even if you get it working, and you should prefer the "--fork"
option instead.  But first you need to figure out how many logical CPUs
you have on this system.

Assuming this is Linux, can you please post the output of:

cat /proc/cpuinfo


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