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Date: Sun, 14 Oct 2012 21:18:19 +0530
From: Dhiru Kholia <>
Subject: Re: Performance with SSE2 support with WPA-PSK and openCL error

On Sun, Oct 14, 2012 at 5:35 PM, [Jano] <> wrote:
> - I tested john-1.7.9-jumbo-7 and it seems the SSE2 cpu implementation
> (using openSSL) not working properly.
> - JTR using only one CPU at 100% and then the k/s are very slow.

Compile JtR with OpenMP enabled to use all cores.

diff --git a/src/Makefile b/src/Makefile
-#OMPFLAGS = -fopenmp -msse2
+OMPFLAGS = -fopenmp -msse2

> Tested on Aspire ONE --> processor Atom N570:
> jano:~/test/john-1.7.9-jumbo-7/run$ ./john --test -fo=wpapsk
> Benchmarking: WPA-PSK PBKDF2-HMAC-SHA-1 [32/32]... DONE
> Raw:    97.0 c/s real, 97.0 c/s virtual
> jano:~$ aircrack-ng -S
> 555 k/s

On my triple-core system, aircrack-ng is 2.2x faster than JtR (both
using all cores).


Can we borrow PMK calculation code from aircrack-ng since they are
using SSE2 implementation of SHA1?


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