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Date: Sun, 16 Aug 2015 22:08:04 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Overstrike rule with UTF-8 characters?

As an alternative to magnum's response:

On Sun, Aug 16, 2015 at 07:50:21AM -0500, nyxgeek wrote:
> 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"

BTW, you can shorten this to:

 <* >\r[00-9] A\p[z0-9]"\xc3\x94"

and actually the same approach works for overstriking as well.  You just
need to delete the two "characters" you want to overstrike first:

 >[0-9A-F] D\0 D\0 A\0"\xc3\x94"

or better (proper length check for a 2-byte character to fit):

 >[1-9A-G] D\p[0-9A-F] D\0 A\0"\xc3\x94"

Of course, since this operates on octets rather than UTF-8 characters,
it may produce some strings with invalid UTF-8 characters as a result
(when overstriking not at a UTF-8 character boundary), along with the
correct and desired results.

You can also use the overstrike command to achieve the same:

 >[1-9A-G] o\p[0-9A-F]\xc3 o\1\x94

Alexander

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