/**
* Render the request hash field
*
* @return string The hmac field
*/
protected function renderTrustedPropertiesField()
{
$formFieldNames = $this->viewHelperVariableContainer->get(\TYPO3\CMS\Fluid\ViewHelpers\FormViewHelper::class, 'formFieldNames');
$requestHash = $this->mvcPropertyMappingConfigurationService->generateTrustedPropertiesToken($formFieldNames, $this->getFieldNamePrefix());
return '<input type="hidden" name="' . $this->prefixFieldName('__trustedProperties') . '" value="' . htmlspecialchars($requestHash) . '" />';
}