如何使用PHP和OpenSSL生成自签名证书

$config = array(
    "private_key_bits" => 2048,
    "private_key_type" => OPENSSL_KEYTYPE_RSA,
);

$privateKey = openssl_pkey_new($config);

openssl_pkey_export($privateKey, $privateKeyString);

$privateKeyFile = '/path/to/private.key';

file_put_contents($privateKeyFile, $privateKeyString);

$csrConfig = array(
    "countryName" => "US",
    "stateOrProvinceName" => "California",
    "localityName" => "San Francisco",
    "organizationName" => "Your Organization",
    "commonName" => "example.com",
);

$csr = openssl_csr_new($csrConfig, $privateKey);

openssl_csr_export($csr, $csrString);

$csrFile = '/path/to/csr.csr';

file_put_contents($csrFile, $csrString);

$validFrom = time();
$validTo = $validFrom + (365 * 24 * 60 * 60); // 1年有效期

$certConfig = array(
    "csr" => $csr,
    "private_key" => $privateKey,
    "valid_from" => $validFrom,
    "valid_to" => $validTo,
);

$certificate = openssl_csr_sign($certConfig, null, $privateKey, 365);

openssl_x509_export($certificate, $certificateString);

$certificateFile = '/path/to/certificate.crt';

file_put_contents($certificateFile, $certificateString);