AcmePhp\Ssl\CertificateRequest::getKeyPair PHP Method

    public function getKeyPair()
    {
        return $this->keyPair;
    }

    /**
     * Generate a CSR object with SANs from the given distinguishedName and keyPair.
     *
     * @param CertificateRequest $certificateRequest
     *
     * @return mixed
     */
    protected function createCsrWithSANsObject(CertificateRequest $certificateRequest)
    {
        $sslConfigTemplate = <<<'EOL'
[ req ]
distinguished_name = req_distinguished_name
req_extensions = v3_req
[ req_distinguished_name ]
[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @req_subject_alt_name
[ req_subject_alt_name ]
%s
EOL;
        $sslConfigDomains = [];
        $distinguishedName = $certificateRequest->getDistinguishedName();
        $domains = array_merge([$distinguishedName->getCommonName()], $distinguishedName->getSubjectAlternativeNames());
        foreach (array_values($domains) as $index => $domain) {
            $sslConfigDomains[] = 'DNS.' . ($index + 1) . ' = ' . $domain;
        }
        $sslConfigContent = sprintf($sslConfigTemplate, implode("\n", $sslConfigDomains));
        $sslConfigFile = tempnam(sys_get_temp_dir(), 'acmephp_');
        try {
            file_put_contents($sslConfigFile, $sslConfigContent);
            $resource = $certificateRequest->getKeyPair()->getPrivateKey()->getResource();
            $csr = openssl_csr_new($this->getCSRPayload($distinguishedName), $resource, ['digest_alg' => 'sha256', 'config' => $sslConfigFile]);
            if (!$csr) {
                throw new CSRSigningException(sprintf('OpenSSL CSR signing failed with error: %s', openssl_error_string()));
            }
            return $csr;
        } finally {
            unlink($sslConfigFile);
        }
    }