Penetration Testing mailing list archives
how to calculate hmac for esp packet?
From: Jun Yin <hansyin () gmail com>
Date: Wed, 4 Apr 2012 02:30:31 -0700
Hi, I'm trying to craft a esp packet for ipsec test, I try to use python to create the hmac, I tried this:
key1="11111111111111111111111111111111" msg="000001340000000b46e66a9853b58a94492be70c535a72d5994c3fe54a7c69e6a433c5a1a24b2c207e28f240b6d51e7b8711daa2b2ec39461dfa246ae23265fcd3c20f4bb1d691beecd8a8a717de6f5bcdc4e4564ca75cdf99e748946b551d1d9dcb2ec0b42294af"
###this msg string is exactly same as shown in the esp packet(after encryption)
hmac.new(key1,msg).hexdigest()
'bbbbf2b73036df453130995a7322412b'
hmac.new(key1,msg.encode('hex')).hexdigest()
'80f23547d19437c4a6278724cb711f31'
looks like this two hmac calculation are both wrong, after I send the packet with this hmac value(first 12 byte), wireshark complain the hmac is wrong: Authentication Data [incorrect, should be 0x3150EDBE93C020C42F23114E] Looks like my calculation is wrong, but I don't know where. Anyone could help? Thanks!!!! -- Rgds, Hans Yin Web: http://sourceforge.net/projects/autotestnet/ Email: hansyin () gmail com MSN: hansyin () hotmail com Skype: hans_yin_vancouver ------------------------------------------------------------------------ This list is sponsored by: Information Assurance Certification Review Board Prove to peers and potential employers without a doubt that you can actually do a proper penetration test. IACRB CPT and CEPT certs require a full practical examination in order to become certified. http://www.iacertification.org ------------------------------------------------------------------------
Current thread:
- how to calculate hmac for esp packet? Jun Yin (Apr 04)