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Message-ID: <20101221204923.GA25860@openwall.com>
Date: Tue, 21 Dec 2010 23:49:23 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: Changing Double to use All Characters
On Mon, Dec 20, 2010 at 10:22:16AM -0500, Rich Rumble wrote:
> I modified the Double external mode with the following line:
>
> while (i--) current[i] = '0'; (was 'a')
> <snip>
>
> Writing to Stdout and checking, it appears to use all cases,
> all numbers and some specials. How would I modify the mode
> to use all specials?
You need to replace all three instances of 'a' - one in init() and two
in generate() - with 0x20 (ASCII code for whitespace). You also need to
replace 'z' (there's just one instance of it) with 0x7e.
> I've also extended the length for NTLM and others very easily:
> int length, current[16];
> <snip>
> if (!current && length < 8) {
For half-lengths of up to 8 (inclusive), you need 17 elements in
current[], not 16. The 17th holds the NUL byte terminating the string.
This is why the original code had:
int length, current[9];
[...]
if (!current && length < 4) {
Perhaps I need to revise this Double mode sample to make it easier to
customize.
Thank you for your comments.
Alexander
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