Date: Wed, 29 Sep 2010 17:23:34 -0700 From: Corbin Simpson <mostawesomedude@...il.com> To: john-users@...ts.openwall.com Subject: 2ch/4ch-style tripcodes? I'm trying to generate tripcodes, which are little slices of crypt() used to identify posters on 2ch, 4chan, and other image boards in that same style. The actual format is pretty simple; a small substitution is done to the key to obtain the salt, another substitution is done to remove invalid characters, and then the entire thing is run through crypt(). Trying to do this "by hand" is pretty easy. I can get around 160K trips/s with glibc's crypt() and 250K trips/s with OpenSSL's DES_fcrypt(). Pretty decent. However, after reading some literature, I'm fairly convinced that my Core i3 is probably capable of squeezing out somewhere between 750K-1.5M trips/s, with the proper crypt() implementation. Since John doesn't export a dynamic-linkable version of crypt(), but instead has its own internal formats tables, I decided to try to write a new hash format that would handle the small alterations needed to crypt and work within John's framework. I have come up against a minor roadblock, though. John's format hooks expect the salt to be part of the ciphertext, not part of the plaintext, and the external mode hooks don't let me specify salt, although they do permit munging the plaintext. I kind of doubt anybody in the community's worked on this specific problem, but is there any advice out there for me? ~ C. -- When the facts change, I change my mind. What do you do, sir? ~ Keynes Corbin Simpson <MostAwesomeDude@...il.com>
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