* add sshkey.Generate function that returns an sshkey.Pair to be used with openssh.
* add cmd/ssh-keygen/main.go for testing purposes
* add a test calling ssh.ParsePrivateKey & ssh.ParseAuthorizedKey (which is very
similar to what openssh would do to read a keypair)
The wrapping of the keys should be handled by crypto/x509.MarshalPKCS8PrivateKey
& x/crypto/ssh.NewPublicKey which does not work for ed25519 and dsa.
x509.MarshalPKCS8PrivateKey marshals ed25519 keys but the keys did not work with openssh.
x509.MarshalPKCS8PrivateKey does not handle dsa keys.
So I had to 'wrap' those manually by reading the code of the openssh package.
Note that ssh.NewPublicKey works with any keytype. I should probably do a PR to ssh to have a NewPrivateKey & Marshalling funcs
Megan Marsh
Adrien Delorme