Jose\Decrypter::decryptRecipientKey PHP Метод

    private function decryptRecipientKey(Object\JWEInterface &$jwe, Object\JWKSetInterface $jwk_set, $i)
    {
        $recipient = $jwe->getRecipient($i);
        $complete_headers = array_merge($jwe->getSharedProtectedHeaders(), $jwe->getSharedHeaders(), $recipient->getHeaders());
        $this->checkCompleteHeader($complete_headers);
        $key_encryption_algorithm = $this->getKeyEncryptionAlgorithm($complete_headers);
        $content_encryption_algorithm = $this->getContentEncryptionAlgorithm($complete_headers);
        foreach ($jwk_set as $jwk) {
            try {
                $this->checkKeyUsage($jwk, 'decryption');
                if ('dir' !== $key_encryption_algorithm->getAlgorithmName()) {
                    $this->checkKeyAlgorithm($jwk, $key_encryption_algorithm->getAlgorithmName());
                } else {
                    $this->checkKeyAlgorithm($jwk, $content_encryption_algorithm->getAlgorithmName());
                }
                $cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $jwk, $recipient, $complete_headers);
                if (null !== $cek) {
                    if (true === $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $complete_headers)) {
                        return $i;
                    }
                }
            } catch (\Exception $e) {
                //We do nothing, we continue with other keys
                continue;
            }
        }
    }