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www.waraxe.us Forum Index -> All other hashes -> L2J hash
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L2J hash
PostPosted: Wed Nov 03, 2010 5:37 am Reply with quote
tehanderson
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Joined: Dec 23, 2009
Posts: 33




The original l2j-encoded hash is:
Code:
3Y/oRuB5uLE9ZWoVn24hJGqLerE=


after some research I found (directly from l2j account manager's php code) that the hashing algo is:
Code:
base64_encode(pack("H*", sha1(utf8_encode($password))));


so I wrote a simple php script to unpack the original sha1 hash:
Code:
unpack("H*",base64_decode($l2j_hash));


which actually returns an array which first element is the string containing the sha1 hash which is encoded like this:
Code:
sha1(utf8_encode($password));


so the resulting sha1 hash in this case is:
Code:
dd8fe846e079b8b13d656a159f6e21246a8b7ab1


which can be actually cracked as a normal sha1 hash.


Last edited by tehanderson on Thu Nov 04, 2010 5:37 pm; edited 1 time in total
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PostPosted: Thu Nov 04, 2010 4:31 pm Reply with quote
-AO-
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Joined: Jul 15, 2008
Posts: 205
Location: United States




Use passwordspro, it has the algorithm. I've used it to crack L2J hash Smile
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PostPosted: Thu Nov 04, 2010 5:16 pm Reply with quote
tehanderson
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Joined: Dec 23, 2009
Posts: 33




Well if you run this php code
Code:
echo sha1(utf8_encode("test"))."\n";
echo sha1("test")."\n";


You 'll see how actually the two things are the same for non-utf8-encoded strings, so

Code:
sha1(utf8_encode($password))==sha1($password)


and thus, once you have decoded the hash, you can just pass it to your favorite GPU cracker with sha1() support, you don't need passwordspro Very Happy

The only thing is that I couldn't crack it... lol
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PostPosted: Tue Nov 09, 2010 5:15 am Reply with quote
-AO-
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Joined: Jul 15, 2008
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Yes, of course.

But before your post was edited, you asked if it was possible Smile
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PostPosted: Tue Nov 09, 2010 8:44 pm Reply with quote
tehanderson
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Joined: Dec 23, 2009
Posts: 33




well I meant if someone was able to crack it actually, sorry Very Happy
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L2J hash
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