AES Encryption

by dshilkret

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/pbkdf2.js"></script>
<h1>CryptoJs AES Encryption/Decryption</h1>
    <div id="encrypted"></div>
    <div id="decrypted"></div>

JavaScript

var keySize = 256;
var ivSize = 128;
var iterations = 100;

var message = "Hello World";
var password = "Secret Password";


function encrypt (msg, pass) {
  var salt = CryptoJS.lib.WordArray.random(128/8);

  var key = CryptoJS.PBKDF2(pass, salt, {
      keySize: keySize/32,
      iterations: iterations
    });

  var iv = CryptoJS.lib.WordArray.random(128/8);

  var encrypted = CryptoJS.AES.encrypt(msg, key, { 
    iv: iv, 
    padding: CryptoJS.pad.Pkcs7,
    mode: CryptoJS.mode.CBC

  });

  // salt, iv will be hex 32 in length
  // append them to the ciphertext for use  in decryption
  var transitmessage = salt.toString()+ iv.toString() + encrypted.toString();
  return transitmessage;
}

function decrypt (transitmessage, pass) {
  var salt = CryptoJS.enc.Hex.parse(transitmessage.substr(0, 32));
  var iv = CryptoJS.enc.Hex.parse(transitmessage.substr(32, 32))
  var encrypted = transitmessage.substring(64);

  var key = CryptoJS.PBKDF2(pass, salt, {
      keySize: keySize/32,
      iterations: iterations
    });

  var decrypted = CryptoJS.AES.decrypt(encrypted, key, { 
    iv: iv, 
    padding: CryptoJS.pad.Pkcs7,
    mode: CryptoJS.mode.CBC

  })
  return decrypted;
}

var encrypted = encrypt("P9T/h9CpREyz0zk", password);
var decrypted = decrypt('33e40327c8b137c36fa111c94383a8c08f23236b648a058bf072a63ee3d5174fApDeUlsN0Nm5D8HrX8VTyQ==', password);

$('#encrypted').text("Encrypted: "+encrypted);
$('#decrypted').text("Decrypted: "+ decrypted.toString(CryptoJS.enc.Utf8) );