Cannot register ECDSA or Ed25519 SSH keys

[Casey Marshall]

I'd like to register my ECDSA and Ed25519 SSH client public keys with Launchpad, so that I can distribute them to my servers and cloud instances with ssh-import-id. However, Launchpad does not accept these as valid keys.

[Casey Marshall (cmars)]

Steps to reproduce:
1. Create an ECC key pair with: "ssh -t ed25519" or "ssh -t ecdsa"
2. cat ~/.ssh/id_ed25519.pub or ~/.ssh/id_ecdsa.pub
3. Attempt to add these to your Launchpad profile.

Problem:
Launchpad shows an error that the public key is invalid.

Expected result:
ECC key added to my profile.

[Dustin Kirkland  (kirkland)]

Launchpad should use 'ssh-keygen -l -f foo' to verify the sanity of the key. And assuming that passes, it should accept the key.

That would additional solve several other nasty situations where Launchpad actually *accepts* keys that have line breaks in them. The above command would catch those and reject them.