PHP Openssl 生成公钥私钥

 <?php
 //配置信息
 $dn = array(
     "countryName" => "GB",
     "stateOrProvinceName" => "Somerset",
     "localityName" => "Glastonbury",
     "organizationName" => "The Brain Room Limited",
     "organizationalUnitName" => "PHP Documentation Team",
     "commonName" => "Wez Furlong",
     "emailAddress" => "wez@example.com"
 );

 $config = array(
     "private_key_bits" => 512, //指定应该使用多少位来生成私钥  512 1024  2048  4096等
     "private_key_type" => OPENSSL_KEYTYPE_RSA, //选择在创建CSR时应该使用哪些扩展。可选值有 OPENSSL_KEYTYPE_DSA, OPENSSL_KEYTYPE_DH, OPENSSL_KEYTYPE_RSA 或 OPENSSL_KEYTYPE_EC. 默认值是 OPENSSL_KEYTYPE_RSA.
 );
  //    生成证书
  $privkey = openssl_pkey_new($config);
  $csr = openssl_csr_new($dn, $privkey);
  $sscert = openssl_csr_sign($csr, null, $privkey, $numberofdays);
  //    导出证书$csrkey
  openssl_x509_export($sscert, $csrkey);
  //    导出密钥$privatekey
  openssl_pkcs12_export($sscert, $privatekey, $privkey, $privkeypass);
  //    获取私钥
  openssl_pkcs12_read($privatekey, $certs, $privkeypass);
  if (empty($certs['pkey'])) {
           $arr = array();
     }
  $prikeyid = $certs['pkey'];
  //    获取公钥
   $pub_key = openssl_pkey_get_public($csrkey);
   $keyData = openssl_pkey_get_details($pub_key);
   if (empty($keyData['key'])) {
          $arr = array();
     }
   $public = $keyData['key'];
   $arr =  array('publicKey'=>$public,'privateKey'=>$prikeyid);
   print_r($arr);
 ?>