# File lib/Dnsruby/resource/TSIG.rb, line 67
      def apply(message, original_request=nil)
        if (!message.signed?)
          tsig_rr = generate(message, original_request)
          message.add_additional(tsig_rr)
          message.tsigstate = :Signed
          @query = message
          tsig_rr.query = message
        end
      end