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Date: Fri, 23 Sep 2011 05:37:56 +0200
From: magnum <rawsmooth@...dband.net>
To: john-dev@...ts.openwall.com
Subject: Re: user-defined character class samples
On 2011-09-23 03:24, Solar Designer wrote:
> On Wed, Sep 21, 2011 at 10:57:33PM +0200, magnum wrote:
>> Dang, now I remember I should have revised that sample, it's not doing
>> what it was supposed to.
>
> I guess you're referring to this one? -
>
> # This silly example rule use the user-defined character class
> # example ?1 above. It will prepend any hex-string of at least
> # 4 digits within a candidate with 0x as well as with \x like
> # this:
> # 'hello' -> rejected
> # 'alibaba' -> 'ali0xbaba' and 'ali\xbaba'
> [List.Rules:Example]
> %4?1vap2Aa"[\\0]x"
>
> If so, that's not what I meant, although we should have removed it (feel
> free to submit a patch such that we don't forget).
Yes, that rule only does the right thing when the hex-digits are
consecutive. %N?C is "reject the word unless it contains at least N
characters of class C" but I did the mistake of assuming "...at least N
consecutive...". By the way, such a command might be useful.
> These examples are correct, right? -
>
> # This is a couple of example classes:
> # ?0 matches (one version of) base64 characters
> # ?1 matches hex digits
> # ?2 matches the TAB character (never try to use \x00!)
> [UserClasses]
> 0 = [a-zA-Z0-9/.]
> 1 = [0-9a-fA-F]
> 2 = \x09
>
> Hmm, did you implement the \x09 thing? I am not sure.
Yes, they are correct and \x09 works fine. This works in ranges too, eg
[\x80-\xff]. But the \x thing only works in that very section: I'm still
pondering how to implement something similar for rules in a clever way.
magnum
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