# File lib/Dnsruby/resource/DNSKEY.rb, line 322
      def rsa_key
        exponentLength = @key[0]
        if (exponentLength.class == String)
          exponentLength = exponentLength.getbyte(0) # Ruby 1.9

        end
        pos = 1
        if (exponentLength == 0)
          key1 = @key[1]
          if (key1.class == String) # Ruby 1.9

            key1 = key1.getbyte(0)
          end
          exponentLength = (key1<<8) + key1
          pos += 2
        end
        exponent = RR::get_num(@key[pos, exponentLength])
        pos += exponentLength

        modulus = RR::get_num(@key[pos, @key.length])
        @key_length = (@key.length - pos) * 8

        pkey = OpenSSL::PKey::RSA.new
        pkey.e = exponent
        pkey.n = modulus
        return pkey 
      end