fn convert_expanded_ed25519_pk(_key: &OpaquePublicKey) -> Result<PublicKey>Expand description
Try to convert an OpaquePublicKey to an ed25519::PublicKey.
This function always returns an error because the custom ed25519-expanded@spec.torproject.org
SSH algorithm should not be used for ed25519 public keys (only for expanded ed25519 key
pairs). This function is needed for the ssh_to_internal_erased! macro.