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<?php
class CertificateGenerator
{
const CONFIG = __DIR__. DIRECTORY_SEPARATOR . 'openssl.cnf';
/** @var OpenSSLCertificate|false */
private $ca = false;
/** @var OpenSSLAsymmetricKey|false */
private $caKey = false;
/** @var bool */
private $useSelfSignedCert;
/** @var OpenSSLCertificate|null */
private $lastCert;
/** @var OpenSSLAsymmetricKey|null */
private $lastKey;
public function __construct(bool $useSelfSignedCert = false)
{
if (!extension_loaded('openssl')) {
throw new RuntimeException(
'openssl extension must be loaded to generate certificates'
);
}
$this->useSelfSignedCert = $useSelfSignedCert;
if (!$this->useSelfSignedCert) {
$this->generateCa();
}
}
/**
* @param int|null $keyLength
* @return resource
*/
private static function generateKey($keyLength = null)
{
if (null === $keyLength) {
$keyLength = 2048;
}
return openssl_pkey_new([
'private_key_bits' => $keyLength,
'private_key_type' => OPENSSL_KEYTYPE_RSA,
'encrypt_key' => false,
]);
}
private function generateCa()
{
$this->caKey = self::generateKey();
$dn = [
'countryName' => 'GB',
'stateOrProvinceName' => 'Berkshire',
'localityName' => 'Newbury',
'organizationName' => 'Example Certificate Authority',
'commonName' => 'CA for PHP Tests'
];
$csr = openssl_csr_new($dn, $this->caKey, ['config' => self::CONFIG]);
$this->ca = openssl_csr_sign($csr, null, $this->caKey, 365, ['config' => self::CONFIG]);
}
public function getCaCert()
{
if ($this->useSelfSignedCert) {
throw new RuntimeException("CA is not generated in self-signed mode.");
}
$output = '';
openssl_x509_export($this->ca, $output);
return $output;
}
public function saveCaCert($file)
{
if ($this->useSelfSignedCert) {
throw new RuntimeException("CA is not available in self-signed mode.");
}
openssl_x509_export_to_file($this->ca, $file);
}
private function generateCertAndKey($commonNameForCert, $file, $keyLength = null, $subjectAltName = null)
{
$dn = [
'countryName' => 'BY',
'stateOrProvinceName' => 'Minsk',
'localityName' => 'Minsk',
'organizationName' => 'Example Org',
];
if ($commonNameForCert !== null) {
$dn['commonName'] = $commonNameForCert;
}
$subjectAltNameConfig = $subjectAltName ? "subjectAltName = $subjectAltName" : "";
$configCode = <<<CONFIG
[ req ]
distinguished_name = req_distinguished_name
default_md = sha256
default_bits = 1024
[ req_distinguished_name ]
[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
$subjectAltNameConfig
[ usr_cert ]
basicConstraints = CA:FALSE
$subjectAltNameConfig
CONFIG;
$configFile = $file . '.cnf';
file_put_contents($configFile, $configCode);
$config = [
'config' => $configFile,
'req_extensions' => 'v3_req',
'x509_extensions' => 'usr_cert',
];
$this->lastKey = self::generateKey($keyLength);
$csr = openssl_csr_new($dn, $this->lastKey, $config);
// If in self-signed mode, sign with the same key, otherwise use CA
$signingCert = $this->useSelfSignedCert ? null : $this->ca;
$signingKey = $this->useSelfSignedCert ? $this->lastKey : $this->caKey;
$this->lastCert = openssl_csr_sign(
$csr,
$signingCert,
$signingKey,
365, // 1 year validity
$config
);
return $config;
}
public function saveNewCertAsFileWithKey(
$commonNameForCert, $file, $keyLength = null, $subjectAltName = null
) {
$config = $this->generateCertAndKey($commonNameForCert, $file, $keyLength, $subjectAltName);
$certText = '';
openssl_x509_export($this->lastCert, $certText);
$keyText = '';
openssl_pkey_export($this->lastKey, $keyText, null, $config);
file_put_contents($file, $certText . PHP_EOL . $keyText);
unlink($config['config']);
}
public function saveNewCertAndKey(
$commonNameForCert, $certFile, $keyFile, $keyLength = null, $subjectAltName = null
) {
$config = $this->generateCertAndKey($commonNameForCert, $certFile, $keyLength, $subjectAltName);
openssl_x509_export_to_file($this->lastCert, $certFile);
openssl_pkey_export_to_file($this->lastKey, $keyFile, null, $config);
unlink($config['config']);
}
public function saveNewCertAndPubKey(
$commonNameForCert, $certFile, $pubKeyFile, $keyLength = null, $subjectAltName = null
) {
$config = $this->generateCertAndKey($commonNameForCert, $certFile, $keyLength, $subjectAltName);
openssl_x509_export_to_file($this->lastCert, $certFile);
$keyDetails = openssl_pkey_get_details($this->lastKey);
if ($keyDetails === false || !isset($keyDetails['key'])) {
throw new RuntimeException("Failed to extract public key.");
}
file_put_contents($pubKeyFile, $keyDetails['key']);
unlink($config['config']);
}
public function getCertDigest($algo)
{
return openssl_x509_fingerprint($this->lastCert, $algo);
}
}
|
