turret-io

<?php
// DEFINE our cipher
define('AES_256_CBC', 'aes-256-cbc');

// Generate a 256-bit encryption key
// This should be stored somewhere instead of recreating it each time
$encryption_key = openssl_random_pseudo_bytes(32);

// Generate an initialization vector
// This *MUST* be available for decryption as well

turret-io

var crypto = require('crypto');
var SHARED_SECRET = "sup3rs3cr3t!!";

function signString(string_to_sign, shared_secret) {
	var hmac = crypto.createHmac('sha512', shared_secret);
	hmac.write(string_to_sign);
	hmac.end()
	return hmac.read();
}