rndc-confgen(8) on macOS
The text 19857bfad6c9, as Mac OS X 10.8.1, Mac OS X 10.8, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.
rndc key generation tool
Flags it lists
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-a -
-b -
-c -
-h -
-k -
-p -
-r -
-s -
-t -
-u