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Date: Wed, 8 Jun 2011 21:20:52 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: 1.7.7-jumbo-6
On Wed, Jun 08, 2011 at 08:37:58PM +0400, Solar Designer wrote:
> On Tue, Jun 07, 2011 at 10:41:43PM -0700, Dhiru Kholia wrote:
> > 1. What about limiting the patch to OpenSSL 1.0.0 series (which
> > hopefully works!)?
>
> This is what I did in -RC4. I also added a check for "compiled against
> 1.0.0+, but running with older version" (which may happen with dynamic
> linking). This is totally untested.
This was slightly buggy. Fixed in -RC5 (on the wiki).
> The warning message I added says it disables OpenMP, although it
> actually only reduces max_keys_per_crypt to 1. This appears to have
> almost no performance impact for this format, so I think it's OK as a
> workaround (definitely better than a crash).
On a dual Xeon E5420 (8 cores total, 2.5 GHz, no HT), Owl-current
(OpenSSL 1.0.0d), I am getting:
Non-OpenMP build:
Benchmarking: ssh [32/64]... DONE
Many salts: 79008 c/s real, 79008 c/s virtual
Only one salt: 78035 c/s real, 78035 c/s virtual
OpenMP:
Benchmarking: ssh [32/64]... (8xOMP) DONE
Many salts: 352204 c/s real, 44324 c/s virtual
Only one salt: 353625 c/s real, 44225 c/s virtual
Somehow only a 4.5x speedup, even though we have 8 "true" cores and zero
system load (the machine is totally unused).
Testing of the runtime check (I patched the check to require
non-existent OpenSSL 2.0 at runtime, just to test it):
Benchmarking: ssh [32/64]... (8xOMP) Warning: compiled against OpenSSL 1.0+, but running with an older version -
disabling OpenMP for SSH because of thread-safety issues of older OpenSSL
DONE
Many salts: 62003 c/s real, 7760 c/s virtual
Only one salt: 61797 c/s real, 7714 c/s virtual
$ ./john ../src/unused/sshdump
Warning: compiled against OpenSSL 1.0+, but running with an older version -
disabling OpenMP for SSH because of thread-safety issues of older OpenSSL
Loaded 2 password hashes with 2 different salts (ssh [32/64])
12345 (rsa_test.key)
12345 (dsa_test.key)
guesses: 2 time: 0:00:00:00 DONE (Wed Jun 8 21:19:07 2011) c/s: 64437 trying: 12345
Use the "--show" option to display all of the cracked passwords reliably
Well, it's not pretty and there's performance impact (vs. non-OpenMP
build), but it works.
Alexander
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