Date: Sun, 19 Jul 2015 13:56:12 +0300 From: Aleksey Cherepanov <lyosha@...nwall.com> To: john-dev@...ts.openwall.com Subject: multiformats, (ab)use of salt in 'gost' format Recently I discovered that 'gost' format has salt. Using it, it differentiates regular gost and cryptpro gost. These can be viewed as 2 formats with 1 algo and different sboxes. There are 2 format tags: #define FORMAT_TAG "$gost$" #define FORMAT_TAG_CP "$gost-cp$" So the 'salt' shows sboxes to use. It can be generalized to multiformats: such formats that handle hashes of different formats as 1 format (even without any similarities between algorithms). Multiformats may be interesting during contests to attack all fast hashes in 1 command (the idea is not mine, Solar Designer shared this idea after last hash runner). It would be something like --format=fast Solar Designer pointed out to me that formats can assume that, when their init() is called, other formats are done(), so 2 formats can't be init()'ed in parallel. Another approach to multiformats would be a wrapper that calls john several times. Other ideas? Thanks! -- Regards, Aleksey Cherepanov
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