protected function execute(InputInterface $input, OutputInterface $output)
 {
     $helper = $this->getHelper('question');
     // ask fields
     $options = ['countryName' => 'CN', 'stateOrProvinceName' => 'Shanghai', 'localityName' => 'Shanghai'];
     if (!$input->getOption('default')) {
         foreach ($options as $ask => $default) {
             $q = new Question($ask . '[' . $default . ']: ', $default);
             $options[$ask] = $helper->ask($input, $output, $q);
         }
     }
     $output->writeln('Generating CA private key...');
     $CAPrivKey = new \Crypt_RSA();
     $key = $CAPrivKey->createKey(2048);
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-ca.key', $key['privatekey']);
     $output->writeln('Generating self-signed CA certificate...');
     $CAPrivKey->loadKey($key['privatekey']);
     $pubKey = new \Crypt_RSA();
     $pubKey->loadKey($key['publickey']);
     $pubKey->setPublicKey();
     $subject = new \File_X509();
     $subject->setDNProp('id-at-organizationName', 'OpenVJ Certificate Authority');
     foreach ($options as $prop => $val) {
         $subject->setDNProp('id-at-' . $prop, $val);
     }
     $subject->setPublicKey($pubKey);
     $issuer = new \File_X509();
     $issuer->setPrivateKey($CAPrivKey);
     $issuer->setDN($CASubject = $subject->getDN());
     $x509 = new \File_X509();
     $x509->setStartDate('-1 month');
     $x509->setEndDate('+3 year');
     $x509->setSerialNumber(chr(1));
     $x509->makeCA();
     $result = $x509->sign($issuer, $subject, 'sha256WithRSAEncryption');
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-ca.crt', $x509->saveX509($result));
     $output->writeln('Generating background service SSL private key...');
     $privKey = new \Crypt_RSA();
     $key = $privKey->createKey(2048);
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-bg-server.key', $key['privatekey']);
     $privKey->loadKey($key['privatekey']);
     $output->writeln('Generating background service SSL certificate...');
     $pubKey = new \Crypt_RSA();
     $pubKey->loadKey($key['publickey']);
     $pubKey->setPublicKey();
     $subject = new \File_X509();
     $subject->setPublicKey($pubKey);
     $subject->setDNProp('id-at-organizationName', 'OpenVJ Background Service Certificate');
     foreach ($options as $prop => $val) {
         $subject->setDNProp('id-at-' . $prop, $val);
     }
     $subject->setDomain('127.0.0.1');
     $issuer = new \File_X509();
     $issuer->setPrivateKey($CAPrivKey);
     $issuer->setDN($CASubject);
     $x509 = new \File_X509();
     $x509->setStartDate('-1 month');
     $x509->setEndDate('+3 year');
     $x509->setSerialNumber(chr(1));
     $result = $x509->sign($issuer, $subject, 'sha256WithRSAEncryption');
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-bg-server.crt', $x509->saveX509($result));
     $output->writeln('Generating background service client private key...');
     $privKey = new \Crypt_RSA();
     $key = $privKey->createKey(2048);
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-bg-client.key', $key['privatekey']);
     $privKey->loadKey($key['privatekey']);
     $output->writeln('Generating background service client certificate...');
     $pubKey = new \Crypt_RSA();
     $pubKey->loadKey($key['publickey']);
     $pubKey->setPublicKey();
     $subject = new \File_X509();
     $subject->setPublicKey($pubKey);
     $subject->setDNProp('id-at-organizationName', 'OpenVJ Background Service Client Certificate');
     foreach ($options as $prop => $val) {
         $subject->setDNProp('id-at-' . $prop, $val);
     }
     $issuer = new \File_X509();
     $issuer->setPrivateKey($CAPrivKey);
     $issuer->setDN($CASubject);
     $x509 = new \File_X509();
     $x509->setStartDate('-1 month');
     $x509->setEndDate('+3 year');
     $x509->setSerialNumber(chr(1));
     $x509->loadX509($x509->saveX509($x509->sign($issuer, $subject, 'sha256WithRSAEncryption')));
     $x509->setExtension('id-ce-keyUsage', array('digitalSignature', 'keyEncipherment', 'dataEncipherment'));
     $x509->setExtension('id-ce-extKeyUsage', array('id-kp-serverAuth', 'id-kp-clientAuth'));
     $result = $x509->sign($issuer, $x509, 'sha256WithRSAEncryption');
     file_put_contents(Application::$CONFIG_DIRECTORY . '/cert-bg-client.crt', $x509->saveX509($result));
 }