# File lib/Dnsruby/resource/TSIG.rb, line 512
      def algorithm=(alg)
        if (alg.class == String)
          if (alg.downcase=="hmac-md5")
            @algorithm = HMAC_MD5;
          elsif (alg.downcase=="hmac-sha1")
            @algorithm = HMAC_SHA1;
          elsif (alg.downcase=="hmac-sha256")
            @algorithm = HMAC_SHA256;
          else
            raise ArgumentError.new("Invalid TSIG algorithm")
          end
        elsif (alg.class == Name)
          if (alg!=HMAC_MD5 && alg!=HMAC_SHA1 && alg!=HMAC_SHA256)
            raise ArgumentException.new("Invalid TSIG algorithm")
          end
          @algorithm=alg
        else
          raise ArgumentError.new("#{alg.class} not valid type for Dnsruby::RR::TSIG#algorithm=  - use String or Name")
        end
        Dnsruby.log.debug{"Using #{@algorithm.to_s} algorithm"}
      end