> Which key management scheme is that code using? Photouris, SKIP, or
> ISAKMP/Oakley?

ISAKMP

Check out
http://web.mit.edu/network/isakmp/nrlkmp-A6.html
and
http://web.mit.edu/network/isakmp/isakmpform.html

I did not find it trivial to compile or run.  But then, this is my first time
compiling unix in about 8 years, and they do warn it's very "alpha".