Encryption.php

<?php
 
namespace Bitrix\Ldap\Internal\Security;
 
final class Encryption
{
    public static function encrypt(string $str, ?string $salt = null): string
    {
        $key = $salt ?? \COption::GetOptionString('main', 'pwdhashadd', 'ldap');
        $key1 = self::binMd5($key);
        $res = '';
        while ($str)
        {
            $m = mb_substr($str, 0, 16, 'ASCII');
            $str = mb_substr($str, 16, mb_strlen($str, 'ASCII') - 16, 'ASCII');
            $res .= self::byteXor($m, $key1, 16);
            $key1 = self::binMd5($key . $key1 . $m);
        }
        return base64_encode($res);
    }
 
    public static function decrypt(string $str, ?string $salt = null): string
    {
        $key = $salt ?? \COption::GetOptionString('main', 'pwdhashadd', 'ldap');
        $key1 = self::binMd5($key);
        $str = base64_decode($str);
        $res = '';
        while ($str)
        {
            $m = mb_substr($str, 0, 16, 'ASCII');
            $str = mb_substr($str, 16, mb_strlen($str, 'ASCII') - 16, 'ASCII');
 
            $m = self::byteXor($m, $key1, 16);
            $res .= $m;
            $key1 = self::binMd5($key . $key1 . $m);
        }
        return $res;
    }
 
    public static function byteXor($a, $b, $l)
    {
        $c = '';
        for ($i = 0; $i < $l; $i++)
        {
            $c .= $a[$i] ^ $b[$i];
        }
        return $c;
    }
 
    public static function binMd5($val)
    {
        return pack('H*', md5($val));
    }
}