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Full disclosure |
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IT Security and Insecurity Portal |
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L2J hash |
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 Posted: Wed Nov 03, 2010 5:37 am |
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| tehanderson |
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| Joined: Dec 23, 2009 |
| Posts: 33 |
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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($password)); |
so the resulting sha1 hash in this case is:
| Code: | | dd8fe846e079b8b13d656a159f6e21246a8b7ab1 |
which can be actually cracked as a normal sha1 hash. |
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Last edited by tehanderson on Thu Nov 04, 2010 5:37 pm; edited 1 time in total |
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| Posted: Thu Nov 04, 2010 4:31 pm |
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| -AO- |
| Advanced user |
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| Joined: Jul 15, 2008 |
| Posts: 205 |
| Location: United States |
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Use passwordspro, it has the algorithm. I've used it to crack L2J hash  |
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| Posted: Thu Nov 04, 2010 5:16 pm |
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| tehanderson |
| Active user |
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| Joined: Dec 23, 2009 |
| Posts: 33 |
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Well if you run this php code
| Code: | echo sha1(utf8_encode("test"))."\n";
echo sha1("test")."\n"; |
You 'll see how actually the two things are the same for non-utf8-encoded strings, so
| Code: | | sha1(utf8_encode($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 
The only thing is that I couldn't crack it... lol |
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| Posted: Tue Nov 09, 2010 5:15 am |
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| -AO- |
| Advanced user |
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| Joined: Jul 15, 2008 |
| Posts: 205 |
| Location: United States |
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Yes, of course.
But before your post was edited, you asked if it was possible |
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| Posted: Tue Nov 09, 2010 8:44 pm |
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| tehanderson |
| Active user |
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| Joined: Dec 23, 2009 |
| Posts: 33 |
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| well I meant if someone was able to crack it actually, sorry |
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