# File lib/backup/cli/utility.rb, line 172
      def decrypt
        case options[:encryptor].downcase
        when 'openssl'
          base64   = options[:base64] ? '-base64' : ''
          password = options[:password_file] ? "-pass file:#{options[:password_file]}" : ''
          salt     = options[:salt] ? '-salt' : ''
          %x[openssl aes-256-cbc -d #{base64} #{password} #{salt} -in '#{options[:in]}' -out '#{options[:out]}']
        when 'gpg'
          %x[gpg -o '#{options[:out]}' -d '#{options[:in]}']
        else
          puts "Unknown encryptor: #{options[:encryptor]}"
          puts "Use either 'openssl' or 'gpg'."
        end
      end