signingalgorithm.php

См. документацию.

<?php
namespace Bitrix\Main\Security\Sign;
 
use Bitrix\Main\NotImplementedException;

abstract class SigningAlgorithm
{
    public function getSignature($value, $key)
    {
        throw new NotImplementedException('Method getSignature must be overridden');
    }

    public function verify($value, $key, $sig)
    {
        return $sig === $this->getSignature($value, $key);
    }
}