How to encrypt in node.js and decrypt in browser javascript

Question

I have a simple nodeJS program to encrypt plaintext:

var crypto = require("crypto");

var compatEnc = crypto.createCipher("aes-256-cbc", "password");
compatCrypted = compatEnc.update("Message", "utf8", "hex");
compatCrypted += compatEnc.final("hex");
console.log(compatCrypted);
// 0293cf0bdf5323cff809ba406ffc8283

I try to decrypt 0293cf0bdf5323cff809ba406ffc8283 on the browser

<!doctype html>
<html>
  <body>
    <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/core-min.js"></script>

    <script>

    var nosalt = CryptoJS.lib.WordArray.random(0);

    // { salt : null } will generate random salt
    var enc = CryptoJS.AES.decrypt("0293cf0bdf5323cff809ba406ffc8283", "password",
    { salt: nosalt });

    console.log(CryptoJS.enc.Utf8.stringify(enc));

    </script>
  </body>
</html>

The output is blank. Can you tell me what is wrong with my decryption code? Thanks.

You know if you hardcode the key into the JS, this encryption is going to be useless, right? — user2357112
– user2357112, Commented Jul 29, 2013 at 20:37
Did you first try decrypting in node.js? I recommend you try that, and then move to the browser. — Yusuf X
– Yusuf X, Commented Jul 29, 2013 at 20:57
the decrypt with nodeJS is easy:var crypto = require("crypto"); var compatEnc = crypto.createDecipher("aes-256-cbc", "password"); compatCrypted = compatEnc.update("0293cf0bdf5323cff809ba406ffc8283", "hex", "utf8"); compatCrypted += compatEnc.final("utf8"); console.log(compatCrypted); // Message — user2631655
– user2631655, Commented Jul 29, 2013 at 21:04

adpalumbo · Accepted Answer · 2013-07-29 21:50:59Z

2

CryptoJS doesn't know that your encrypted text is hex-encoded.

Convert it to a WordArray first using CryptoJS.enc.Hex.parse(...);.

answered Jul 29, 2013 at 21:50

adpalumbo

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