How to export private ed25519 subkey to the SSH format

[Daniel Kahn Gillmor]

On Sun 2017-04-30 17:18:11 -0700, Jon Gorrono wrote:
> I've used Monkeysphere's openpgp2ssh tool
>
> https://incenp.org/notes/2014/gnupg-for-ssh-authentication.html
>
> It's in a bunch of linux repo's and also brew...

I don't think that monkeysphere's openpgp2ssh tool handles ed25519 at
the moment (i'm part of monkeysphere upstream).  It'd be great if it
did!

        --dkg