[Openswan Users] Fwd: what's the problem of this hmac?

[Jun Yin]

---------- Forwarded message ----------
From: Jun Yin <hansyin at gmail.com>
Date: Wed, Apr 4, 2012 at 2:24 AM
Subject: what's the problem of this hmac?
To: users at openswan.org


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"
>>> hmac.new(key1,msg).hexdigest()
'bbbbf2b73036df453130995a7322412b'
>>> hmac.new(key1,msg.encode('hex')).hexdigest()
'80f23547d19437c4a6278724cb711f31'
>>>

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 at gmail.com
MSN:   hansyin at hotmail.com
Skype: hans_yin_vancouver


-- 
Rgds,

Hans Yin
Web:   http://sourceforge.net/projects/autotestnet/
Email:  hansyin at gmail.com
MSN:   hansyin at hotmail.com
Skype: hans_yin_vancouver