void
    silc_client_request_authentication_method(SilcClient client,
                                              SilcClientConnection conn,
                                              SilcConnectionAuthRequest
                                                callback,
                                              void *context);

    This function can be used to request the current authentication method
    from the server. This may be called when connecting to the server
    and the client library requests the authentication data from the
    application. If the application does not know the current authentication
    method it can request it from the server using this function.
    The `callback' with `context' will be called after the server has
    replied back with the current authentication method.