# File lib/openid/server.rb, line 257
      def answer(secret)
        mac_key = @dh.xor_secrect(@consumer_pubkey, secret)
        return {
          'dh_server_public' => OpenID::Util.num_to_base64(@dh.public),
          'enc_mac_key' => OpenID::Util.to_base64(mac_key)
        }
      end