john-users - Overstrike rule with UTF-8 characters?

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Date: Sun, 16 Aug 2015 07:50:21 -0500
From: nyxgeek <nyxgeek@...abs.co>
To: john-users@...ts.openwall.com
Subject: Overstrike rule with UTF-8 characters?

Hello,

Is it possible to overstrike a position with a unicode character using John’s rules?

For example, the following works fine:

o[0-9]\xF8

This will overstrike positions 0-9 with the letter ø (latin small letter o with stroke).  Overstrike also works fine with a range of any normal ASCII:

o[0-9][a-zA-Z0-9!@...&*()]

However, if I try to put in a unicode hex value, I get an error. I’m unable to find a way that it will take a unicode character that is longer than 2 hex digits.

Unicode is possible in other areas with John rules.  For example, I can do the following, and it works to INSERT:

<* >\r[00123456789] A\p[z0-9]"\xc3\x94”

This will insert a Ô (latin capital letter O with circumflex) at each character position.

I believe the issue is getting John to see the two hex values as a single UTF-8 character.  Quotes around the pair, such as in the example above, won't work with the overstrike. Whether it is “\xF8” or “\xc3\x94” — both return an “unknown command” error.

Any advice would be appreciated.

Thanks!

Paul

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