1、生成key文件
openssl genrsa -des3 -out https.key 1024
会提示输入密码，根据提示设置密码即可
Enter pass phrase for https.key:
Verifying - Enter pass phrase for https.key:
2、生成csr文件
openssl req -new -key https.key -out https.csr
如果提示输入密码，就输入生成key时输入的密码。
//国家
Country Name (2 letter code) [AU]:CN
//省
State or Province Name (full name) [Some-State]:GD
//市
Locality Name (eg, city) []:SZ
//组织名称
Organization Name (eg, company) [Internet Widgits Pty Ltd]:IPC
//可不写
Organizational Unit Name (eg, section) []:IPC
//一般写网站域名
Common Name (e.g. server FQDN or YOUR name) []:IPC
//邮箱
Email Address []:IPC
Please enter the following 'extra' attributes
to be sent with your certificate request
//可不写
A challenge password []:
//可不写
An optional company name []:
3、生成crt文件
openssl x509 -req -days 3650 -in https.csr -signkey https.key -out https.crt