$ openssl genrsa 2048 > server.key
$ openssl req -new -key server.key > server.csr
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]:JP
State or Province Name (full name) []:Tokyo
Locality Name (eg, city) [Default City]:Minato-ku
Organization Name (eg, company) [Default Company Ltd]:OSCA
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server's hostname) []:weblabo.oscasierra.net
Email Address []:
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
$ openssl x509 -days 3650 -req -signkey server.key < server.csr > server.crt