Converting PHP encrypt/decrypt to Node.js - php

Question

I have been trying to find out how to make this:
function encrypt_decrypt($action, $string) {
$output = false;
$encrypt_method = "AES-256-CBC";
$secret_key = 'HqFdkh2FX126fH1r';
$secret_iv = 'iS2dk82dXd26f61K';
// hash
$key = hash('sha256', $secret_key);
// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);
if ( $action == 'encrypt' ) {
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
$output = base64_encode($output);
} else if( $action == 'decrypt' ) {
$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
}
return $output;
}
In Node.js
The reason is that the encryption will be handled by PHP and the decryption by Node.
EDIT:
I managed to get this far:
var crypto = require('crypto')
, key = 'cI8Jd96NDoasd09jcI8Jd96NDoasd09j'
, iv = 'cI8Jd96NDoasd09j'
, plaintext = '2';
hashedKey = crypto.createHash('sha256').update(key, 'utf-8').digest('hex');
console.log('hashed key=', hashedKey);
// corresponds to the hashed key in PHP
hashedIv = crypto.createHash('sha256').update(iv, 'utf-8').digest('hex').substring(0,16);
console.log('hashed iv=', hashedIv);
// corresponds to the hashed iv in PHP
var buf = Buffer.from(teamId, 'base64');
console.log("buffer: " + buf);
and the variable buf actually is the same as base64_decode($string in the PHP code.
However, when I do this:
var decipher = crypto.createDecipheriv("aes-256-cbc",key, iv);
var decrypted = decipher.update(buf, 'base64', 'utf8');
console.log("decrypted.toString(): " + decrypted.toString());
I'm getting Z���ߋd�M:�� in the console rather than the desired 2.

Answer 1

The main problem was an embarrasing one. We are mainly two devs on this project and I thought the php-file I was editing for the encryption and decryption was the only thing I had to care about.
It was later realized that the actual call for the encoding was made from another php-file. Thus, what I changed in the encoding in the file I was working on was all in vain.
The end result looks like this, for anyone who's interested:
function encrypt_decrypt($action, $string) {
$output = false;
$encrypt_method = "AES-256-CBC";
$secret_key = '32 byte key';
$secret_iv = '16 byte iv';
// hash
$key = substr(hash('sha256', $secret_key), 0, 32);
// iv - encrypt method AES-256-CBC expects 16 bytes - else you will get a warning
$iv = substr(hash('sha256', $secret_iv), 0, 16);
if ( $action == 'encrypt' ) {
$output = openssl_encrypt($string, $encrypt_method, $key, 0, $iv);
//$output = base64_encode($output);
} else if( $action == 'decrypt' ) { // this below is now handled in Node
$output = openssl_decrypt($string, $encrypt_method, $key, 0, $iv);
//$output = openssl_decrypt(base64_decode($string), $encrypt_method, $key, 0, $iv);
}
return $output;
}
And Node:
function getDecryptedTeamId(encryptedId) {
var hashedKey;
var hashedIv;
var crypto = require('crypto')
, key = 'same 32 byte key as above in php'
, iv = 'same 16 byte ivas above in php'
, plaintext = '2';
hashedKey = crypto.createHash('sha256').update(key, 'utf-8').digest('hex').substring(0,32);
key = hashedKey;
hashedIv = crypto.createHash('sha256').update(iv, 'utf-8').digest('hex').substring(0,16);
iv = hashedIv;
var buf = Buffer.from(encryptedId, 'base64');
var crypt = buf.toString('base64');
var decryptor = crypto.createDecipheriv("aes-256-cbc", hashedKey, hashedIv);
var teamIdDec = decryptor.update(buf);
teamIdDec += decryptor.final();
return teamIdDec;
}