ssl 证书公私钥文件

https://github.com/walkor/phpsocket.io/tree/master/docs/zh
我使用这个框架开发网页推送服务，但是启动服务报错，以下是报错信息
```
SSL handshake error: stream_socket_enable_crypto(): SSL_R_NO_SHARED_CIPHER: no suitable shared cipher could be used. This could be because the server is missing an SSL certificate (local_cert context option)
```
查看生成的公私钥文件跟在阿里云，七牛云都不同