Date: Fri, 17 Aug 2012 08:41:09 -0400 (EDT) From: jfoug@....net To: john-users@...ts.openwall.com Subject: Re: Cracking Gauss using dynamic On Fri, Aug 17, 2012 at 7:31 AM, jfoug@....net wrote: > On Fri, Aug 17, 2012 at 12:40 AM, Solar Designer wrote: >> I thought that maybe the implementation of phpass in the dynamic >> format was generic enough - but it is not. Its loop is hardcoded in >> DynamicFunc__PHPassCrypt(). So it seems like the current dynamic >> format >> is incapable of arbitrary loops. This may be something for JimF to >> enhance - not for this specific target, but in general. > > There is no looping, or variables, or much of any other 'fancy' things > in dynamic. Mostly, it is an array of very simple function pointers, > such as: clear-this-buffer, append-this-string, crypt-this-buffer, > convert-this-to-base-16-and-append-to-buffer, etc, etc. Those are not > the real function names, but that is pretty much 'what' they do, and > how much smarts they have. > > So if you wanted to (with current dynamic), do 10k crypt of the crypt, > you would simply have to build a format with whatever initialization > code was needed to get things 'started', and then 10k of these (well, > 9999 of the 2nd part): > > DynamicFunc__crypt_md5_in1_to_out2 > DynamicFunc__clean_input2 > DynamicFunc__append_from_last_output2_as_raw > DynamicFunc__crypt2_md5() > DynamicFunc__clean_input2_kwik > DynamicFunc__append_from_last_output2_as_raw > DynamicFunc__crypt2_md5() > DynamicFunc__clean_input2_kwik > DynamicFunc__append_from_last_output2_as_raw > > // 9996 more of the: > DynamicFunc__clean_input2_kwik > DynamicFunc__overwrite_from_last_output2_as_base16_no_size_fix Sorry, wrong, code, should have been DynamicFunc__append_from_last_output2_as_raw That was cut/paste from some code that did not match this problem. > DynamicFunc__crypt2_md5() > > // then a final > DynamicFunc__clean_input2_kwik > DynamicFunc__overwrite_from_last_output2_as_base16_no_size_fix Same problem here, should have been DynamicFunc__append_from_last_output2_as_raw > DynamicFunc__crypt_md5_in2_to_out1 ....
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