http://www.cppcns.com/os/linux/283378.html

https://www.linuxidc.com/Linux/2019-11/161440.htm

https://www.linuxidc.com/Linux/2019-11/161439.htm

http://www.360doc.com/content/18/0721/09/39899686_772074910.shtml

https://baijiahao.baidu.com/s?id=1616567513193166927&wfr=spider&for=pc

实际可用的CA签名程序：ca_sign.php.txt本站点CA签发数字证书申请实例演示：关于PHP生成证书密钥的资料真是好少啊，查了半天，最终还是在官方文档找到了相关资料，又根据自己的理解 ***

https://www.cnblogs.com/wpjamer/p/9030259.htmlhttps://www.cnblogs.com/shilxfly/p/6868684.html

set up ocsp using opensslAssuming that you already have an OpenSSL Certificate Authority set up ***

https://blog.csdn.net/qq_29344757/article/details/81128150

https://www.cnblogs.com/missmzt/p/5308149.html