CryptoJS AES encryption key size in JavaScript?

Good day, guys. I am having a trouble while developing AES encryption using CryptoJS in javascript. Let's see my source code first.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script src="jquery-3.5.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/core.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/enc-base64.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/md5.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/evpkdf.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/cipher-core.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/aes.min.js"></script>
<!--<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/pad-nopadding.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/lib-typedarrays.min.js"></script>-->
<script type="text/javascript">
    $(document).ready(function() {
        var encrypted = "TEST";
        var key = CryptoJS.enc.Hex.parse("bf161fba8b12433f176bc9088e14bd49499ee34fcb4694082345639957e778852bdc904206c4ecd2d3e2f4bc");
        var iv  = CryptoJS.enc.Hex.parse("18a69482e9d401052c4307dcb8124409");
        var decrypted = CryptoJS.AES.encrypt(encrypted, key, { iv: iv });
        var dec         = CryptoJS.AES.decrypt(decrypted, key, { iv: iv });

        var _cipher     = decrypted.toString();
        var _plain      = dec.toString();
    });
</script>

Here, you can see my key size is 44 bytes which is 352 bits. But CryptoJS perfectly encrypts and decrypts with IV 16 bytes length. I totally don't understand how this happen. With my understanding, AES standard uses 128, 192 and 256 bits key size. https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

My problem is that I have to write some codes on C# to encrypt that same data with same key and iv. But C# does not allow to use 44 bytes key length for AES. I am using RijndaelManaged.

Is there anyone who can explain how this happens in CryptoJS? So that I can write my own C# codes. Thanks in advance.

CryptoJS AES encryption key size in JavaScript?

0 Answers