monaca-lib/src/localkit/rc4.js

Monaca cloud and localkit API bindings for JavaScript

(function() {
  const CryptoJS = require('crypto-js');

  const encrypt = function(msg, pairingKey) {
    if (!pairingKey) {
      throw new Error('Pairing key required to encrypt.');
    }
    // if the msg is buffer, we need to use convert it to string. 
    const data =  Buffer.isBuffer(msg) ? CryptoJS.lib.WordArray.create(msg) : msg;

    return CryptoJS.RC4.encrypt(data, 
      CryptoJS.enc.Utf8.parse(pairingKey)).toString();  
  }

  const decrypt = function(msg, pairingKey) {
    if (!pairingKey) {
      throw new Error('Pairing key required to decrypt data.');
    }
    const encryptedHex = CryptoJS.enc.Base64.parse(msg);
    return CryptoJS.RC4.decrypt({ ciphertext: encryptedHex }, 
      CryptoJS.enc.Utf8.parse(pairingKey)).toString(CryptoJS.enc.Utf8);  
  };

  module.exports = {
    encrypt: encrypt,
    decrypt: decrypt
  };
})();