authentication for Phase 1 per dratf-ietf-ipsec-isakmp-gss-auth-06.txt.
This work was done by Frank van der Linden of Wasabi Systems, Inc.
under contract from Zembu Labs, Inc.
you need KAME tree to compile this (point the top by ${KAMEROOT}
in Makefile.inc).
XXX maybe too big for /sbin...869K with certificate support, and 574K without
certificate support (i386, stripped, static-link)