# File lib/Dnsruby/resource/RRSIG.rb, line 257
      def sig_data
        #RRSIG_RDATA is the wire format of the RRSIG RDATA fields

        #with the Signer's Name field in canonical form and

        #the Signature field excluded;

        data = MessageEncoder.new { |msg|
          msg.put_pack('ncc', @type_covered.to_i, @algorithm.to_i, @labels)
          msg.put_pack("NNN", @original_ttl, @expiration, @inception)
          msg.put_pack("n", @key_tag)
          msg.put_name(@signers_name, true)
        }.to_s
        return data
      end