NodeJS Crypto encryption to front end javascript decryption

Question

I'm looking for AES256 CBC decryption client side,

in nodeJS I use this function to encrypt:

exports.encrypt = function(txt, cryptkey){
  var cipher = crypto.createCipher('aes-256-cbc',cryptkey);
  var crypted = cipher.update(txt,'utf8','hex');
  crypted += cipher.final('hex');

  console.log(crypted);
  return crypted;

};

but I can't seem to work with it in any client side library (JSAES.js, SJCL.js, pidcrypt)

my guess is it has something to do with the base64/hex encoding decoding, any pointers?

nekman · Accepted Answer · 2013-02-24 18:33:18Z

8

Please have a look at the CryptoJS project:

Here is an example of AES256 CBC encryption / decryption:

Include:

<script src="http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/aes.js"></script>
<script src="http://crypto-js.googlecode.com/svn/tags/3.1.2/build/components/mode-cfb-min.js"></script>

JS:

var passPhrase = "Secret Phassphrase";

var encrypted = CryptoJS.AES.encrypt("Message", passPhrase, { mode: CryptoJS.mode.CFB });
var decrypted = CryptoJS.AES.decrypt(encrypted, passPhrase, { mode: CryptoJS.mode.CFB });

console.log('encrypted', encrypted);
console.log('decrypted', decrypted.toString(CryptoJS.enc.Utf8));

View the demo at jsFiddle

answered Feb 24, 2013 at 18:33

nekman

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3 Comments

RecycleRobot Over a year ago

I included the "mode-cfb-min.js" on the server nodeJS and was able to encrypt cryptoJS server side AND client side, thanks!! :)

TechTurtle Over a year ago

is it safe to store passPhrase at client side? Further, is it the same pass phrase we are using in encrypt function's parameter cryptkey?

nekman Over a year ago

1.) No, it is not safe to store it on the client side. The above code is just for demo purpose. 2.) Check the documentation github.com/brix/crypto-js :)

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