/**
 * The XOR cipher is a type of additive cipher.
 * Each character is bitwise XORed with the key.
 * We loop through the input string, XORing each
 * character with the key.
 */

/**
 * Encrypt using an XOR cipher
 * @param {String} str - String to be encrypted
 * @param {Number} key - key for encryption
 * @return {String} encrypted string
 */

function XOR (str, key) {
  let result = ''
  for (const elem of str) {
    result += String.fromCharCode(elem.charCodeAt(0) ^ key)
  }
  return result
}

export { XOR }

// Nb: Node REPL might not output the null char '\x00' (charcode 0)

// > XOR('test string', 32)
// 'TEST\x00STRING'

// > XOR('TEST\x00STRING', 32)
// 'test string'