HELP !!! I'm buried in noise!!

First of all, my
company makes satellite radios, and I implemented SNMP support
(v1, v2) for our radios and switches, which use an SoC based on
ARM9 processor. I did this by using net-snmp utilities to talk
to snmpd, capturing packets in WireShark, and
reverse-engineering the various Get/GetNext/Set/GetBulk/Trap
requests and responses. This is working well, and I can
communicate successfully with our devices, using net-snmp
utilities and a Visual Studio application.

Now we want to add v3 support... I've captured v3 comm sequences
for authNoPriv and authPriv
communications, but beyond that I'm in unknown territory...

As a starter, I thought I'd just look at the authentication
messages, and leave encryption for later, but I can't even
figure out how to match the MD5 messages that I see in the
packets; for one thing, all the MD5 utilities that I've seen,
generate 16-byte messages, while the MD5 data (msgAuthParams)
in these messages is only 12 bytes. Beyond that, I don't know
what portion of the messages the digest is generated over.

ITM, I tried looking at snmpget, and the functions in snmplib
that this calls, but I got as far as generate_Ku() and am
completely lost!!

Are there tutorials somewhere, that will discuss at a higher
level, how to handle the message generation for auth and
encryption for snmpv3, preferably with respect to the openssl
modules ?? And will I actually need detailed understanding of
how encryption works before I can implement these functions?

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