def _parse_kexgss_complete(self, m):
        """
        Parse the SSH2_MSG_KEXGSS_COMPLETE message (client mode).

        :param `Message` m: The content of the SSH2_MSG_KEXGSS_COMPLETE message
        """
        if self.transport.host_key is None:
            self.transport.host_key = NullHostKey()
        self.f = m.get_mpint()
        mic_token = m.get_string()
        # This must be TRUE, if there is a GSS-API token in this message.
        bool = m.get_boolean()
        srv_token = None
        if bool:
            srv_token = m.get_string()
        if (self.f < 1) or (self.f > self.p - 1):
            raise SSHException('Server kex "f" is out of range')
        K = pow(self.f, self.x, self.p)
        # okay, build up the hash H of
        # (V_C || V_S || I_C || I_S || K_S || min || n || max || p || g || e || f || K)  # noqa
        hm = Message()
        hm.add(
            self.transport.local_version,
            self.transport.remote_version,
            self.transport.local_kex_init,
            self.transport.remote_kex_init,
            self.transport.host_key.__str__(),
        )
        if not self.old_style:
            hm.add_int(self.min_bits)
        hm.add_int(self.preferred_bits)
        if not self.old_style:
            hm.add_int(self.max_bits)
        hm.add_mpint(self.p)
        hm.add_mpint(self.g)
        hm.add_mpint(self.e)
        hm.add_mpint(self.f)
        hm.add_mpint(K)
        H = sha1(hm.asbytes()).digest()
        self.transport._set_K_H(K, H)
        if srv_token is not None:
            self.kexgss.ssh_init_sec_context(
                target=self.gss_host, recv_token=srv_token
            )
            self.kexgss.ssh_check_mic(mic_token, H)
        else:
            self.kexgss.ssh_check_mic(mic_token, H)
        self.transport.gss_kex_used = True
        self.transport._activate_outbound()