mcrypt_encrypt in CFB mode function in CryptoJS

Question

I'm trying to convert an mcrypt_encrypt function written in php to node.js, I am using CryptoJS in node.js and tried all kinds of config options and I am not having any luck figuring this thing out.

PHP CODE:

base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128,md5($secretKey),$ldapPwd,MCRYPT_MODE_CFB,$initialVector))

JavaScript Code That I tried do not know what I am doing wrong:

var encrypted = CryptoJS.AES.encrypt(password, keyBase64,
{
    keySize: 128 / 8,
    iv: iv,
    mode: CryptoJS.mode.CFB,
    padding: CryptoJS.pad.NoPadding
});

Answer 1

The Cipher Feedback (CFB) mode is a family of block cipher modes with a segment size parameter. Mcrypt only supports CFB8 whereas CryptoJS only supports CFB128. They are incompatible.

I've implemented CFBb in CryptoJS which also supports 8-bit segments, but it is only tested for CryptoJS 3.1.2 and not the CryptoJS 2 version which is available through NPM.

Answer 2

In PHP, when you use mcrypt_module_open with Rijndael-128, you have to pass a 32 byte key and a 16 byte IV.

So with nodeJs, you can use the crypto module, for example :

var crypto = require('crypto');

//Declare our secret key
var key = 'fcda0ssdegfffc9441581bdd86484513dd9cb1547df2jsd';

//Declare our alogrithm
var algorithm = 'AES-256-CFB';

//Generate IV to hex format, so 8 * 2 = 16 bytes
var iv = crypto.randomBytes(8).toString('hex');

//Declare our string to encrypt
var password = 'HELLO WORLD';


var handler = {};

handler.encrypt64 = function(algorithm, key, vector, password){

    //create a cipher with an IV
    var cipher = crypto.createCipheriv(algorithm, key.substr(0,32), iv);

    //Encrypt our password from utf8 to hex
    var encrypted = cipher.update(password, 'utf8', 'base64'); 

    //Return any remaining enciphered data to hex format
    encrypted += cipher.final('base64');

    //Return a base64 String
    return encrypted;
};

handler.decrypt64 = function(algorithm, key, vector, password){

    //create a decipher with an IV
    var decipher = crypto.createDecipheriv(algorithm, key.substr(0, 32), iv);

    //Decrypt our encode data from base64 to utf8
    var decrypted = decipher.update(encode, 'base64', 'utf8');

    decrypted += decipher.final('utf8');


    //Return a utf8 string
    return decrypted;
};

var encode = handler.encrypt64(algorithm, key, iv, password);

var decode = handler.decrypt64(algorithm, key, iv, encode);