ssh-keysign(8) on macOS

The text 6472b6c64151, as Mac OS X 10.7.5, 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.

ssh helper program for host-based authentication

ssh-keysign(8) on macOS now