ntp-keygen(8) on FreeBSD
The text ad6408e3a9fb, as FreeBSD 9.3-RELEASE shipped it.
key generation program for ntpd
Flags it lists
-
-G -
-H -
-I -
-M -
-P -
-T -
-V -
-c -
-d -
-e -
-g -
-i -
-p -
-q -
-s