# File lib/hiera/backend/eyaml/utils.rb, line 40
        def self.secure_file_delete args
          file = File.open(args[:file], 'r+')
          num_bytes = args[:num_bytes]
          [0xff, 0x55, 0xaa, 0x00].each do |byte|
            file.seek(0, IO::SEEK_SET)
            num_bytes.times { file.print(byte.chr) }
            file.fsync
          end
          File.delete args[:file]
        end