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Message-ID: <CANO7a6w4ZTZrXTC3aTNVn=TZ7ed_hyO0q8Bx0Rc6c6Zdn+q_Bw@mail.gmail.com>
Date: Tue, 1 Jan 2013 01:47:28 +0530
From: Dhiru Kholia <dhiru.kholia@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: npdf2john
On Tue, Jan 1, 2013 at 1:20 AM, shane Shane
<shane@...twareontheside.info> wrote:
> I completed a new version of npdf2john in ruby:
>
> https://github.com/ShaneQful/npdf2john_ruby
>
> It's a lot smaller about 165 lines of code and easier to understand than
> original perl. I'll port it to python later in the week
Awesome! We could use both Ruby and Python versions. Solar will still
demand a Perl or C version ;)
I will start testing it. I want to get rid of older pdf format as soon
as possible and rename npdf to pdf.
> but there was one part of the output which I
> didn't understand and was
> wondering if anyone could shed light on it.
>
> "$npdf$4*4*128*-1028*1*16*e03460febe17a04 ....."
>
> That 1 is the same for every pdf I have passed through the original tool &
> the perl code is a bit beyond me so I anyone knows and could let me know so I can finish it and
> start the port to python.
This "1" part means metadata is encrypted (This part / flag is called
encrypt_metadata in npdf_fmt_plug.c).
encrypt_metadata flag can be 0 or 1.
> Also if there's anything else to do with document cracking that you want me
> to do just let me know :)
We could use some help on analysis of LastPass database format
(probably requires some reverse engineering).
If this doesn't interest you, see
http://openwall.info/wiki/john/wishlist and pick up a task.
--
Dhiru
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