Symetric encryption/decryption for PHP and NodeJS communication

encryption.js

'use strict';

const crypto = require('crypto');

const AES_METHOD = 'aes-256-cbc';
const IV_LENGTH = 16; // For AES, this is always 16, checked with php

const password = 'lbwyBzfgzUIvXZFShJuikaWvLJhIVq36'; // Must be 256 bytes (32 characters)

function encrypt(text, password) {
    if (process.versions.openssl <= '1.0.1f') {
        throw new Error('OpenSSL Version too old, vulnerability to Heartbleed')
    }
    
    let iv = crypto.randomBytes(IV_LENGTH);
    let cipher = crypto.createCipheriv(AES_METHOD, new Buffer(password), iv);
    let encrypted = cipher.update(text);

    encrypted = Buffer.concat([encrypted, cipher.final()]);

    return iv.toString('hex') + ':' + encrypted.toString('hex');
}

function decrypt(text) {
    let textParts = text.split(':');
    let iv = new Buffer(textParts.shift(), 'hex');
    let encryptedText = new Buffer(textParts.join(':'), 'hex');
    let decipher = crypto.createDecipheriv('aes-256-cbc', new Buffer($password), iv);
    let decrypted = decipher.update(encryptedText);

    decrypted = Buffer.concat([decrypted, decipher.final()]);

    return decrypted.toString();
}

encryption.php

<?php

define('AES_METHOD', 'aes-256-cbc');

$password = 'lbwyBzfgzUIvXZFShJuikaWvLJhIVq36';

function encrypt($message, $password)
{
    if (OPENSSL_VERSION_NUMBER <= 268443727) {
        throw new RuntimeException('OpenSSL Version too old, vulnerability to Heartbleed');
    }
    
    $iv_size        = openssl_cipher_iv_length(AES_METHOD);
    $iv             = openssl_random_pseudo_bytes($iv_size);
    $ciphertext     = openssl_encrypt($message, AES_METHOD, $password, OPENSSL_RAW_DATA, $iv);
    $ciphertext_hex = bin2hex($ciphertext);
    $iv_hex         = bin2hex($iv);
    return "$iv_hex:$ciphertext_hex";
}
function decrypt($ciphered, $password) {
    $iv_size    = openssl_cipher_iv_length(AES_METHOD);
    $data       = explode(":", $ciphered);
    $iv         = hex2bin($data[0]);
    $ciphertext = hex2bin($data[1]);
    return openssl_decrypt($ciphertext, AES_METHOD, $password, OPENSSL_RAW_DATA, $iv);
}

You're a lifesaver, thanks @Tiriel.

For newbies like me, in line 10 in encryption.js, the function takes two arguments namely text and password. password is the constant key in the file, while text is the password you will give the function to encrypt.

Moreover, I had to change $password to password in line 28.

Fixed the .js decrypt function

• it fixes the variable error
• it fixes the function 2nd argument not being there (password)
• it fixed deprecation warnings and uses the new forms of buffer
  

function decrypt(text, password){
    let textParts = text.split(':');
    let iv = Buffer.from(textParts.shift(), 'hex');
    let encryptedText = Buffer.from(textParts.join(':'), 'hex');
    let decipher = crypto.createDecipheriv('aes-256-cbc', Buffer.from(password), iv);
    let decrypted = decipher.update(encryptedText);

    decrypted = Buffer.concat([decrypted, decipher.final()]);

    return decrypted.toString();
}

Hello,

Thanks for implementation in PHP & NodeJS.

But now i need implementation of decryption in Browser Javascript using CryptoJS library, i have written below code but its not working, just returning empty string, see if any body can make it work:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.1.1/crypto-js.min.js"></script>
<script>
function decrypt (encrypted) {
	encrypted = encrypted.split(':');
	let key = CryptoJS.enc.Utf8.parse('1234567890abcdefghijklmnopqrstuv');
	let iv = CryptoJS.enc.Hex.parse(encrypted.shift());
	let data = CryptoJS.enc.Hex.parse(encrypted.join(':'));
	data = CryptoJS.AES.decrypt({
            ciphertext: data
        },key,{iv:iv}).toString(CryptoJS.enc.Utf8);
        return data;
}
</script>

EDITED: The above code is now working, just have to provide "data" (actual encrypted string) inside an object under key "ciphertext" as a first paramater to decrypt function instead of directly passing "data".

Clear the buffer issue between old and new version of the system
https://stackoverflow.com/questions/52165333/deprecationwarning-buffer-is-deprecated-due-to-security-and-usability-issues

How can I make the above code work for large files? I get different chunks when using php and nodejs.