nerves_keylibrary has helper functions that create certificates using the
x509library and Erlang's
public_keyapplication. Note that the X.509 certificates are still completely valid and usable by services that require them. If a third party service cannot be made to work with the constraints imposed by the NervesKey, you can still create an X.509 certificate for their use with the public key from the NervesKey. However, you cannot store that X.509 certificate in the NervesKey.