https://blog.wongcw.com/2018/11/16/php-%e5%9f%ba%e6%96%bcmcrypt-%e7%9a%84%e5%8a%a0%e5%af%86%e8%a7%a3%e5%af%86%e7%b0%a1%e5%96%ae%e9%a1%9e/