```
// generate rsa pub from priv
$ openssl rsa -in ~/.ssh/foo -pubout > foo.pub

// format that to ssh-rsa from the pubout
$ ssh-keygen -f ~/.ssh/foo.pub -i -mPKCS8 > bar.pub

// for some reason you can't redirect to the file being read in
$ mv bar.pub foo.pub

// correct perms
$ chmod 0644 foo.pub
```