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Date: Wed, 21 Sep 2011 08:20:12 -0500
From: "JimF" <jfoug@....net>
To: <john-dev@...ts.openwall.com>
Subject: Re: -lz (was: No problem seen in Jumbo-6-RC5+0002)
pkzip certainly uses -lz. I use zlib explicitly in the cracking of pkzip
passwords. To crack them, you have to inflate the blob. I did not write the
entire inflate code into john, I use zlib, with a negative bit size, and
calling the 2nd form init function. That forces zlib to simply handle 'raw'
deflated blobs like pkzip writes out, vs gzip blobs with a header. But I do
absolutely use zlib. I did write a very small amount of inflate-like code
directly into john, but it does not inflate. It simply performs the
validation of one 'operation', or part of one operation, looking for data
which does not validate (most bogus data will NOT be of proper format). It
is much faster to do it that way (validating 1 op code), than to use all of
the overhead of zlib to try to detect errors in the first few bytes.
Why he is getting a linkage error, could be due to dynamic builds, with
dynamic modules which have already loaded lz, and the -lz being a static
lib. Just a guess, since dynamic/static and other linkage issues on *nix is
not my strong suite.
Jim.
----- Original Message -----
From: "Solar Designer" <solar@...nwall.com>
> Previously, Robert reported needing -lz for making a static build of
> John with his install of OpenSSL.
> ...
> Now -lz appears to be needed for pkzip_fmt_plug.c anyway - at least when
> I tried removing -lz, my build on Mac OS X failed:
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