signaturehelper.php

<?php
namespace Bitrix\Main\UserField;
 
class SignatureHelper
{
    public static function getSignature(SignatureManager $signatureManager, array $fieldParam)
    {
        return $signatureManager->getSignature(
            static::getSignatureParam($fieldParam)
        );
    }
 
    public static function validateSignature(SignatureManager $signatureManager, array $fieldParam, $signature)
    {
        return $signatureManager->validateSignature(
            static::getSignatureParam($fieldParam),
            $signature
        );
    }
 
    protected static function getSignatureParam(array $fieldParam)
    {
        array_walk_recursive($fieldParam, function(&$item)
        {
            $item = strval($item);
        });
 
        $signatureParam = array(
            'ENTITY_ID' => $fieldParam['ENTITY_ID'],
            'FIELD' => $fieldParam['FIELD'],
        );
 
        if(!empty($fieldParam['VALUE']))
        {
            $fieldParam['VALUE'] = str_replace("\r\n", "\n", $fieldParam['VALUE']);
            $signatureParam['VALUE'] = $fieldParam['VALUE'];
        }
 
        if(!empty($fieldParam['CONTEXT']))
        {
            $signatureParam['CONTEXT'] = $fieldParam['CONTEXT'];
        }
 
        return serialize($signatureParam);
    }
}