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Date: Mon, 2 Apr 2012 22:50:51 +0530
From: Dhiru Kholia <>
Subject: Re: Cracking Office 2007 files with JtR!

On Mon, Apr 2, 2012 at 10:30 PM, Solar Designer <> wrote:
> On Mon, Apr 02, 2012 at 09:04:52PM +0530, Dhiru Kholia wrote:
>> I have just committed a rough (it is in heavy debugging stage) patch
>> to crack Office 2007 documents with JtR.
> Wow.  Thank you!
> Well, but it wouldn't work yet since you had the password being tested
> hard-coded. ;-)  I've corrected this with the attached patch (it also
> speeds things up by a whopping 1% here).

heh, my bad! Will apply your patch to git.

>> Performance on Atom(TM) CPU N270,
>> $ ../run/john -format=office -t
>> Benchmarking: Office [32/32]... DONE
>> Raw:    30.3 c/s real, 30.3 c/s virtual
> That's 50k iterations of SHA-1.  Definitely something to have on GPU.
> And no need to move AES to GPU then.


> Why is the length limited to 8?  Can't Office 2007 files have longer
> passwords?

Password can be longer. Fixing this too. Thanks for the early report.


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