Date: Sun, 23 Mar 2014 01:13:14 +0400 From: Aleksey Cherepanov <lyosha@...nwall.com> To: john-dev@...ts.openwall.com Subject: proof of concept converter of rexgen-like syntax into john rules I heard about possibility to pull rexgen into john. I know nothing about rexgen but I saw some examples. I think rexgen-like syntax could be a part of rules and performed at preprocessor level like . For instance -s x** rexgen"\0o(n|ff)" } would be translated into -s x** Az"on" } -s x** Az"off" } I do not propose exactly rexgen"..." as the syntax. I saw some examples and I wrote simple script to implement the syntax. It does not seem very hard. The script converts rexgen-like expression into john's rules. It does not support '(' inside , there is no way to escape '(', '|' and ')'. But it correctly expands groups and it could handle multiple \0. It lacks correct user interface. I used M and X0zz rules to support multiple \0 so generated rules change memorized value. It would be a problem combining it with other rules. I expand groups, then I expand \0 into rules. Though I have a problem with $rule = "b(\\|a)(0|1)e"; Because first branches together give me \0 that was not on input. It should not be hard to implement it right. Implementation at the preprocessor level could have drawbacks. I do not know them. I will not continue the work but if you have questions about the script I will answer them. Thanks! -- Regards, Aleksey Cherepanov View attachment "rexgen.pl" of type "text/x-perl" (2343 bytes)
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