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Date: Thu, 1 Oct 2015 22:58:38 +0200
From: magnum <>
Subject: GPU-side mask vs. tens of millions of hashes


I got the idea to test a really large number of hashes with GPU-side 
mask (primarily to stress-test the new FMT_REMOVE code), and it bailed 

$ ../run/john -form:raw-md5-opencl -mask:?a -min-len=3 -max-len=6
Device 0: GeForce GTX TITAN X
Loaded 24917564 password hashes with no different salts (Raw-MD5-opencl 
[MD5 OpenCL])
128 bit add overflow.

Is this an expected outcome, or is 25 million hashes supposed to work 
fine? If it's not supposed to work, what is the design maximum? Perhaps 
we can bail out with a bit more finesse, eg. telling the user a max.?

oclHashcat supports "up to 100 million hashes". I'm not sure we need to 
support that, but it wouldn't hurt.


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