transport.py 文件源码

def get_server_key(self):
        """
        Return the active host key, in server mode.  After negotiating with the
        client, this method will return the negotiated host key.  If only one
        type of host key was set with `add_server_key`, that's the only key
        that will ever be returned.  But in cases where you have set more than
        one type of host key (for example, an RSA key and a DSS key), the key
        type will be negotiated by the client, and this method will return the
        key of the type agreed on.  If the host key has not been negotiated
        yet, ``None`` is returned.  In client mode, the behavior is undefined.

        :return:
            host key (`.PKey`) of the type negotiated by the client, or
            ``None``.
        """
        try:
            return self.server_key_dict[self.host_key_type]
        except KeyError:
            pass
        return None