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Date: Wed, 24 Dec 2008 09:57:36 +0300
From: Solar Designer <>
Subject: Re: large pot and --show problem

On Mon, Dec 22, 2008 at 01:01:13AM +0000, Ruben Lara wrote:
> I have a problem running john --show with a passfile, it's extremely slow.
> My pot is ~400 MB, ...

What hash type does that "slow" password file use?  What hash type is
prevalent in your pot file?  What version of JtR (and any patches) do
you use?

My guess is that you're dealing with saltless hashes, and that the
corresponding *_fmt.c file (coming from a patch) does not provide proper
binary_hash[]() functions.

If so, you may consider improving that *_fmt.c file and/or you may use
the workaround suggested in this posting:

The piece of code quoted in that posting is normally very fast, but it
becomes very slow under conditions mentioned above.  If so, it may be
dropped (commented out) with little harm.  Please also see these
follow-up postings:

Please let the list know if you try making this change and whether it
helps (and how much) or not.



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