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Date: Mon, 2 Jul 2012 13:16:33 -0500
From: "jfoug" <jfoug@....net>
To: <john-dev@...ts.openwall.com>
Subject: RE: I think I got it (was: For some dynamic formats on linux-x86-mmx build cracking depends on password candidate sequence)
I think I can do this by making this change to the pre-loader:
typedef struct DYNAMIC_Setup_t
{
char *szFORMAT_NAME; // md5(md5($p).$s) etc
// Ok, this will be the functions to 'use'.
// This should be a 'null' terminated list. 5000 is MAX.
DYNAMIC_primitive_funcp *pFuncs;
struct fmt_tests *pPreloads;
DYNAMIC_Constants *pConstants;
unsigned flags;
unsigned startFlags;
int SaltLen; // these are SSE lengths
int MaxInputLen; // SSE max length password
+ int MaxInputLenX86; // if zero, then use PW len of SSE
+ int SaltLenX86; // if zero, then use salt len of SSE
} DYNAMIC_Setup;
Then I can change the pre-loads to all properly setup themselves for SSE (mmx). If they can have longer passwords in x86 mode (or longer salts?? Probably not), then I can add that data, and it will allow it to get set properly.
Frank. THANK YOU very much, for your dogged persistence in tracking this down. With your description, I am pretty sure I can get it working properly.
This is certainly something that needs fixed. Running against very 'ugly' word lists will cause dynamic to slowly smash itself, if used on a format that does not call the clean_full (which most do not).
Jim.
>From: jfoug [mailto:jfoug@....net]
>>$ ./john --list=format-all-details |grep -B 15 -A 5 dynamic_2:
>>
>>Format label dynamic
>>Max. password length in bytes 82
Clip.
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