uploaderfilesigner.php

См. документацию.

<?php
 
namespace Bitrix\Main\UserField\File;
 
 
use Bitrix\Main\Security\Sign\Signer;
use Bitrix\Main\Security\Sign\BadSignatureException;
 
class UploaderFileSigner
{
    private const SALT_PREFIX = 'UploaderFileSigner_';
    public function __construct(
        private readonly string $entityId,
        private readonly string $fieldName
    )
    {
    }
 
    public function sign(int $fileId): string
    {
        return (new Signer())->sign((string)$fileId, $this->getSalt());
    }
 
    public function verify(string $signedString, int $fileId): bool
    {
        try
        {
            $unsignedFileId = (int)(new Signer())->unsign($signedString, $this->getSalt());
 
            return ($fileId === $unsignedFileId);
        }
        catch (BadSignatureException $e)
        {
            return false;
        }
 
        return false;
    }
 
    private function getSalt(): string
    {
        return substr(preg_replace('/[^a-zA-Z0-9_.-]+/i', '',self::SALT_PREFIX . '_' . $this->entityId .'_' . $this->fieldName), 0, 50);
    }
}