XorEncrypt.php

<?php
/**
 * XorEncrypt.php
 * Copyright (c) 2021 Cvar1984 <[email protected]>
 *
 *            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *                    Version 2, December 2004
 *
 * Everyone is permitted to copy and distribute verbatim or modified
 * copies of this license document, and changing it is allowed as long
 * as the name is changed.
 *
 *            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 *   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 *
 *  0. You just DO WHAT THE FUCK YOU WANT TO.
 */

namespace Cvar1984\Utils;

class XorEncrypt
{
    public static function encrypt(
        string $text,
        string $key
    ) : string
    {
        $textLen = strlen($text);

        for($x = 0; $x < $textLen; $x++) {
            $text[$x] = ($text[$x] ^ $key);
        }
        return $text;
    }
    public static function decrypt(
        string $text,
        string $key
    ) : string
    {
        return self::encrypt($text, $key);
    }
}

$enc = XorEncrypt::encrypt('hello world', true);
$dec = XorEncrypt::decrypt($enc, true);

echo 'enc: ', $enc, PHP_EOL, 'dec: ', $dec, PHP_EOL;