1.0 only supports RSA keys. In 1.1 (pre-release), 25519 keys are supported.

Here's an example of the full output from `tinc -n foo init` on a node named `yarp` in Tinc 1.1, which is roughly the same as the command linked to: https://gist.github.com/anonymous/95cd556cfcb66119234ed14255...

"expert" mode would be to just generate those same keypairs with openssl, and configs by hand.

With 1.0, you can only have RSA. With 1.1, you can have RSA and/or ED25519.