利用openssl生成證書
第一步：
生成一個4096bit的rsa key
openssl genrsa -out ca.key 4096
Generating RSA private key, 4096 bit long modulus....................................................................................................................................................++
...........................++
e is 65537 (0x10001)
第二步：
建立根CA證書 ca.crt
openssl req -new -x509 -days 1826 -key ca.key -out ca.crt
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:
State or Province Name (full name) []:
Locality Name (eg, city) [Default City]:
Organization Name (eg, company) [Default Company Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server's hostname) []:
Email Address []:
這樣就生成了兩個證書檔案：
ca.crt ca.key