XOR A String using a key

xorWithKey.js

// This doesn't seem like it would be secure since whatever "key" was being stored on the device 
// would have to have either been generated by the device or requested by the device
export const encryptXOR = (text, key) => {
  const bytes = utf8.encode(text);
  const output = [];
 
  for (let i = 0; i < bytes.length; i++) {
    output[i] = String.fromCharCode(
      bytes[i].charCodeAt(0) ^ key[i % key.length].charCodeAt(0)
    );
  }
 
  return base64.encode(output.join(''));
};