SAML2\Response\Processor::processAssertions PHP Method

    private function processAssertions(Response $response)
    {
        $assertions = $response->getAssertions();
        if (empty($assertions)) {
            throw new NoAssertionsFoundException('No assertions found in response from IdP.');
        }
        if (!$this->responseIsSigned) {
            foreach ($assertions as $assertion) {
                if (!$assertion->getWasSignedAtConstruction()) {
                    throw new UnsignedResponseException('Both the response and the assertion it contains are not signed.');
                }
            }
        }
        return $this->assertionProcessor->processAssertions($assertions);
    }