Keychain

<?php
/**
 * Keychain
 * @version 10-11-2024
 */
function keychain($ct, $mt, $pw = '') {

    /**
     * Encrypt
     */
    if($mt === true) {
        $iv = openssl_random_pseudo_bytes(16);
        $pw = hash_pbkdf2('sha256', $pw, $iv, 1000, 32, true);
        $en = openssl_encrypt($ct, 'AES-256-CBC', $pw, OPENSSL_RAW_DATA, $iv);
        return base64_encode($iv . $en);
    }

    /**
     * Decrypt
     */
    if($mt === false) {
        $ct = base64_decode($ct);
        $iv = substr($ct, 0, 16);
        $pw = hash_pbkdf2('sha256', $pw, $iv, 1000, 32, true);
        $ct = substr($ct, 16);
        return openssl_decrypt($ct, 'AES-256-CBC', $pw, OPENSSL_RAW_DATA, $iv);
    }
}