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authorLuke Leighton <lkcl@samba.org>1999-11-21 19:24:01 +0000
committerLuke Leighton <lkcl@samba.org>1999-11-21 19:24:01 +0000
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you know what? this sort of thing makes me laugh. hmm, what functions
have we got. and what data do we have. hmm.. i wonder what the NTLMv2 user session key can be... hmmm... weell.... there's some hidden data here, generated from the user password that doesn't go over-the-wire, so that's _got_ to be involved. and... that bit of data took a lot of computation to produce, so it's probably _also_ involved... and md4 no, md5? no, how about hmac_md5 yes let's try that one (the other's didn't work) oh goodie, it worked! i love it when this sort of thing happens. took all of fifteen minutes to guess it. tried concatenating client and server challenges. tried concatenating _random_ bits of client and server challenges. tried md5 of the above. tried hmac_md5 of the above. eventually, it boils down to this: kr = MD4(NT#,username,domainname) hmacntchal=hmac_md5(kr, nt server challenge) sess_key = hmac_md5(kr, hmacntchal); (This used to be commit ab174759cd210fe1be888d0c589a5b2669f7ff1e)
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