decryptor.php

<?php
declare(strict_types=1);

$password = 'OwO what\'s this?';

$alg = SODIUM_CRYPTO_PWHASH_ALG_DEFAULT;
$opslimit = SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE;
$memlimit = SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE;
$salt = 'YIFFYIFFYIFFYIFF';

$secret_key = sodium_crypto_pwhash(32, $password, $salt, $opslimit, $memlimit, $alg);

$ciphertext = base64_decode("azSM4RHZt2mUQK/7erNxIrUsBLn5em6cK1gelBV9W9TKRqwZdETlNFiuDhzK6cI00S05LmhpCQyoqIZF9EErIHVnsP5na/Fr");
$nonce = 'YIFFYIFFYIFFYIFFYIFFYIFF';
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $secret_key);

echo $plaintext, PHP_EOL;