Cifre con CryptoJS y descifre con PHP

Solución:

Hola,

para lograr esto, se debe considerar usar la clave y iv con 32 dígitos hexadecimales cada uno, tuve que resolver exactamente esto haciendo mis cosas y aquí está el camino

<!--
This reach.your.crypto.js is just a ficticious placeholder, 
that was used replaced by http://crypto-js.googlecode.com/svn/tags/3.1.2/build/,
which does not exist anymore,
which is the path to your CryptoJS library,
that can be downloaded through 
https://code.google.com/archive/p/crypto-js/downloads?page=1
-->
<script src="https://foroayuda.es/reach.your.crypto.js/rollups/aes.js">
</script>

<script type="text/javascript">
//The key and iv should be 32 hex digits each, any hex digits you want, 
//but it needs to be 32 on length each
var key = CryptoJS.enc.Hex.parse("0123456789abcdef0123456789abcdef");
var iv =  CryptoJS.enc.Hex.parse("abcdef9876543210abcdef9876543210");

/*
if you wish to have a more friendly key, you can convert letters to Hex this way:
var a = "D";
var hex_D = a.charCodeAt(0).toString(16);
just to mention,
if it were to binary, it would be:
var binary_D = a.charCodeAt(0).toString(2);
*/

var secret = "Hi, this will be seen uncrypted later on";

//crypted
var encrypted = CryptoJS.AES.encrypt(secret, key, {iv:iv});
//and the ciphertext put to base64
encrypted = encrypted.ciphertext.toString(CryptoJS.enc.Base64);    
//Assuming you have control on the server side, and know the key and iv hexes(we do),
//the encrypted var is all you need to pass through ajax,
//Let's follow with welcomed pure JS style, to reinforce one and other concept if needed
var xh = new XMLHttpRequest();
xh.open("POST", "decrypt_in_php.php", true);
xh.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xh.send("encrypted="+encodeURIComponent(encrypted));
</script>

Y ahora recibiendo y descifrando en PHP

<?php
//Here we have the key and iv which we know, because we have just chosen them on the JS,
//the pack acts just like the parse Hex from JS

$key = pack("H*", "0123456789abcdef0123456789abcdef");
$iv =  pack("H*", "abcdef9876543210abcdef9876543210");

//Now we receive the encrypted from the post, we should decode it from base64,
$encrypted = base64_decode($_POST["encrypted"]);
$shown = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $iv);

echo $shown;
//Although the decrypted is shown, there may be needed to trim and str_replace some r n x06 x05, if there is not a better "trim" way to do it though
?>

Con esto tendremos de vuelta el “Hola, esto se verá sin encriptar más adelante” 🙂

Aquí hay una solución basada en este comentario, usando openssl_decrypt desde PHP.

los JavaScript part (desarrollo con NodeJS para navegadores) – primero, instale CryptoJS con npm install crypto-js, luego tu código JS:

import aes from 'crypto-js/aes'
import encHex from 'crypto-js/enc-hex'
import padZeroPadding from 'crypto-js/pad-zeropadding'

// message to encrypt
let msg = "Hello world";

// the key and iv should be 32 hex digits each, any hex digits you want, but it needs to be 32 on length each
let key = encHex.parse("0123456789abcdef0123456789abcdef");
let iv =  encHex.parse("abcdef9876543210abcdef9876543210");

// encrypt the message
let encrypted = aes.encrypt(msg, key, {iv:iv, padding:padZeroPadding}).toString();

// and finally, send this "encrypted" string to your server

Sobre el PHP lado, su código se verá así:

// we use the same key and IV
$key = hex2bin("0123456789abcdef0123456789abcdef");
$iv =  hex2bin("abcdef9876543210abcdef9876543210");

// we receive the encrypted string from the post
$encrypted = $_POST['decrypt'];
$decrypted = openssl_decrypt($encrypted, 'AES-128-CBC', $key, OPENSSL_ZERO_PADDING, $iv);
// finally we trim to get our original string
$decrypted = trim($decrypted);

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