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Date: Mon, 7 Feb 2011 03:43:57 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: John the Ripper does not detect openssl MD5 hashes
Martin,
On Mon, Feb 07, 2011 at 01:25:47AM +0200, Martin T wrote:
> I tried to create few MD5 hashes using openssl and then crack those
> hashes using John the Ripper(version 1.7.3.1) and a dictionary file.
You need to apply the jumbo patch (or use a build made with the patch
applied) in order to crack raw MD5 hashes. Then, you will need the
"--format=raw-md5" option to avoid misdetection (because many different
hash types may have the same 32 hex characters look).
The official JtR supports MD5-based crypt(3) hashes, but not raw MD5.
You may download the jumbo patch or a pre-patched build here:
http://www.openwall.com/john/#contrib
http://download.openwall.net/pub/projects/john/contrib/linux/
http://openwall.info/wiki/john/custom-builds#Compiled-for-Linux-x86
> As you can see, john detects this as a "LM DES [64/64 BS MMX]" not
> "MD5" (this is probably a default if nothing else matches?).
No, it's not a default. This is what I meant above re: different hash
types being encoded in the same way, with 32 hex chars.
> root@...tin-desktop:~# john --wordlist=/usr/share/john/password.lst --format=MD5 md5crypt
This tells JtR to only load MD5-based crypt(3) hashes, and you have none
of those in your file.
To summarize, you need to do two things at once:
1. Use a jumbo-patched build of JtR.
2. Supply the "--format=raw-md5" option to it.
Alternatively, if you're just experimenting, you may generate hashes of
a type supported by the official JtR. You can use these Perl scripts:
http://www.openwall.com/lists/john-users/2008/06/18/3
BTW, the above posting is one of those linked from:
http://openwall.info/wiki/john/mailing-list-excerpts
And you may want to refer to this wiki page with sample hashes:
http://openwall.info/wiki/john/sample-hashes
I hope this helps.
Alexander
P.S. You could prefer to run those commands as a non-root user. It's
not a good habit to run things as root unnecessarily, and from your
shell prompt you don't appear to be on a throw-away LiveCD system.
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