ar crypto = require('crypto');
var algorithm = 'aes-128-ecb';
var key = '1234';

/*-----------------------------------------------------------*
 * ENCRYPT: AES 128 bit, CBC                                 *
 *-----------------------------------------------------------*/
 var data = "jugs";

 var ciphertext = _encrypt(data, key, algorithm);

 console.log(ciphertext);


/*-----------------------------------------------------------*
 * DECRYPT: AES 128 bit, CBC                                 *
 *-----------------------------------------------------------*/

 var plain = _decrypt(ciphertext, key, algorithm);



/********************************************************************
                      IMPLEMENTING FUNCTIONS...
********************************************************************/

function _encrypt(data, key, algorithm)
{
  var clearEncoding = 'utf8';
  var cipherEncoding = 'base64'; // hex, base64

  var cipher = crypto.createCipher(algorithm, key);
  var cipherChunks = [];
  cipherChunks.push(cipher.update(data, clearEncoding, cipherEncoding));
  cipherChunks.push(cipher.final(cipherEncoding));

 return (cipherChunks);
}

function _decrypt(ciphertext, key, algorithm)
{
  var clearEncoding = 'utf8';
  var cipherEncoding = 'base64'; // hex, base64

  var decipher = crypto.createDecipher(algorithm, key);
  var plainChunks = [];
  for (var i = 0;i < ciphertext.length;i++) {
   plainChunks.push(decipher.update(ciphertext[i], cipherEncoding, clearEncoding));
  }
  plainChunks.push(decipher.final(clearEncoding));
  var plaintext = plainChunks.join('');

 return (plaintext);
}