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-----BEGIN OPENSSH PRIVATE KEY-----
...

$ openssl genrsa -out privatekey

...

$ chmod 600 privatekey
$ ssh-keygen -y -f privatekey > publickey

localhost: Trying pubkey authentication with key file 'privatekey'
localhost: Login completed, opening dummy shell channel.
localhost: channel 0: new [client-session]
localhost: Requesting channel_open for channel 0.