1. 生成rsa密钥对，openssl genrsa -aes256 -out my-private-encrypted.key 2048
2. openssl rsa -in my-private-encrypted.key -out my-private-decrypted.key（建议chmod 600 my-private-decrypted.key)
3. openssl req -new -sha256 -key my-private-decrypted.key -out mydomain.com.csr
4. 粘贴csr到startssl
   
5. 然后下载文件，并上传到服务器中。
   
6. 在服务器上，刚刚上传文件的地方，下载sub.class1.server.sha2.ca.pem
   wget http://plamenatv.free.bg/up.html
7. 把两个文件合并到一起（不知道为什么要这样做，大概是为了方便引用？）
8. sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048
9. 修改nginx配置文件

server {
        listen 80;
        listen [::]:80;
        server_name test.skys215.com;
        return 301 https://$host$request_uri;
}

server{
        listen 443 ssl;
        server_name test.skys215.com;

        ssl on;
        ssl_certificate /path/to/unified.crt;
        ssl_certificate_key /path/to/my-private-decrypted.key;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_prefer_server_ciphers on;
        ssl_dhparam /etc/ssl/certs/dhparam.pem;
        ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
        ssl_session_timeout 1d;
        ssl_session_cache shared:SSL:50m;
        ssl_stapling on;
        ssl_stapling_verify on;
        add_header Strict-Transport-Security max-age=15768000;

        root /var/www/test;
        index index.html;

        location / {
                try_files $uri $uri/ =404;
        }
}

1. 访问https://www.ssllabs.com/ssltest/analyze.html?d=test.skys215.com，
   

如果结果是A+那就可以了~

但是，starcom签发的证书已经被chrome和firefox标为不受信任的证书提供商。用以上浏览器打开会显示为不安全。