skey(1) on OpenBSD
The text ead97a86bb37, as OpenBSD 4.1, OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8 shipped it.
respond to an OTP challenge
Flags it lists
-
-md4 -
-md5 -
-n -
-p -
-rmd160 -
-sha1 -
-x