IP Authentication Header implementation

[Kamil Sarac <ksarac@cs.ucsb.edu>]

Hello all,
I am a grad student at UC Santa Barbara. I am writing this note to ask for
your help on IP Authentication Header.

Unfortunately I am not familiar with Crypto but need to use HMAC-MD5 for
my project.  I am supposed to implement a new protocol MRM (Multicast
Route Monitoring) for end systems. The packet format for MRM is as 
follows:

+--------------------------------------------------------------
| IP Header  |  Authentication Header(AH)  |  UDP Header |  MRM Header
+--------------------------------------------------------------

Here, I need to use "IPsec Authentication Header with HMAC-MD5
transformation as the standard authentication algorithm" (from MRM draft).
I will implement this for SUN (solaris) machines. I will use RAW IP
sockets to create an IP packet and need to have a code to do AH part for
me.

My question is: Do you have a sample implementation for doing this
authentication process or do you know any place where I can find a sample
implementation for this ?

I will greatly appreciate your help on this.

	- kamil

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