While previously dissecting Server*DHParams, the session
        server_kx_pubkey should have been updated.

        XXX Add a 'fixed_dh' OR condition to the 'anonymous' test.

def post_dissection(self, pkt):
        """
        While previously dissecting Server*DHParams, the session
        server_kx_pubkey should have been updated.

        XXX Add a 'fixed_dh' OR condition to the 'anonymous' test.
        """
        s = self.tls_session
        if s.prcs and s.prcs.key_exchange.no_ske:
            pkt_info = pkt.firstlayer().summary()
            log_runtime.info("TLS: useless ServerKeyExchange [%s]", pkt_info)
        if (s.prcs and
            not s.prcs.key_exchange.anonymous and
            s.client_random and s.server_random and
                s.server_certs and len(s.server_certs) > 0):
            m = s.client_random + s.server_random + raw(self.params)
            sig_test = self.sig._verify_sig(m, s.server_certs[0])
            if not sig_test:
                pkt_info = pkt.firstlayer().summary()
                log_runtime.info("TLS: invalid ServerKeyExchange signature [%s]", pkt_info)