Decrypting PHP openssl_ecrypt with NodeJS crypto errors - php

Question

We have a legacy PHP system that encrypted some data via openssl_encrypt. The PHP code is pretty straight forward. (All values are randomly generated for this example, but are the same format and lengths as the real values and reproduce the same errors).
$in = '12345';
$method = 'AES-256-CBC';
$key = '5fjfwc7kp84z5yet358t';
$options = 0;
$iv = '8x69nt6qnptg3x4j';
openssl_encrypt($in, $method, $key, $options, $iv);
Decrypting via PHP is also pretty straight forward.
$in = 'yy03+cUpsq5uGWclBLtwIA==';
$method = 'AES-256-CBC';
$key = '5fjfwc7kp84z5yet358t';
$options = 0;
$iv = '8x69nt6qnptg3x4j';
openssl_decrypt($in, $method, $key, $options, $iv);
However, when trying to port it over to Node crypto I keep getting errors on key length, iv length, and numerous other errors as I try different approaches.
const input = Buffer.from('yy03+cUpsq5uGWclBLtwIA==');
const iv = Buffer.from('8x69nt6qnptg3x4j');
const key = Buffer.from('5fjfwc7kp84z5yet358t');
let decipher = crypto.createDecipheriv('aes-256-cbc', key, iv, 0);
let clearText = decipher.update(input, 'base64', 'utf8');
clearText += decipher.final('utf8');
I've probably tried half a dozen or more examples in NodeJS and all produce errors and fail to decrypt entirely.
Current error is "Invalid key length" which remains the error even if I restrict it to 16 characters.

Answer 1

Padding and base64 processing was the solution. Working code looks closer to this:
const keyStr = '5fjfwc7kp84z5yet358t';
const diff = Math.abs(keyStr.length - 32);
const padding = Buffer.alloc(diff, 0x00);
const input = Buffer.from('yy03+cUpsq5uGWclBLtwIA==', 'base64');
const iv = Buffer.from('8x69nt6qnptg3x4j');
let key = Buffer.from('5fjfwc7kp84z5yet358t');
key = Buffer.concat([key, padding]);
const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv, 0);
let clearText = decipher.update(input, 'base64', 'utf8');
clearText += decipher.final('utf8');