Kelunik\Acme\KeyPair::getPrivate PHP Method

    public function getPrivate()
    {
        return $this->private;
    }

    /**
     * {@inheritdoc}
     */
    public function generate(KeyPair $keyPair, array $domains)
    {
        if (!($privateKey = openssl_pkey_get_private($keyPair->getPrivate()))) {
            // TODO: Improve error message
            throw new AcmeException("Couldn't use private key.");
        }
        $san = implode(",", array_map(function ($dns) {
            return "DNS:{$dns}";
        }, $domains));
        // http://www.heise.de/netze/rfc/rfcs/rfc7633.shtml
        // http://www.heise.de/netze/rfc/rfcs/rfc6066.shtml
        $mustStaple = $this->mustStaple ? "tlsfeature = status_request" : "";
        $tempFile = tempnam(sys_get_temp_dir(), "acme-openssl-config-");
        $tempConf = <<<EOL
[ req ]
distinguished_name = req_distinguished_name
req_extensions = v3_req
{$mustStaple}

[ req_distinguished_name ]

[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = digitalSignature, nonRepudiation
subjectAltName = {$san}
EOL;
        (yield \Amp\File\put($tempFile, $tempConf));
        $csr = openssl_csr_new(["CN" => reset($domains)], $privateKey, ["digest_alg" => "sha256", "config" => $tempFile]);
        (yield \Amp\File\unlink($tempFile));
        if (!$csr) {
            // TODO: Improve error message
            throw new AcmeException("CSR could not be generated.");
        }
        (yield new CoroutineResult(openssl_csr_export($csr, $csr)));
    }