# File lib/new_relic/agent/obfuscator.rb, line 17
      def initialize(key, length=nil)
        if key.nil? || key.empty?
          @key_bytes = EMPTY_KEY_BYTES
        else
          @key_bytes = key.bytes.to_a
          @key_bytes = @key_bytes.first(length) if length
        end
      end