### opensslのversion確認
$ openssl version
### 秘密鍵作成
$ openssl genrsa -des3 -out ./server.key 2048




$ openssl req -new -key server.key -out server.csr
Enter pass phrase for server.key: 秘密鍵作成時のパスワードを入力
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]:日本なのでJPを入力
State or Province Name (full name) []:都道府県を入力
Locality Name (eg, city) [Default City]:市区町村を入力
Organization Name (eg, company) [Default Company Ltd]:企業名を入力
Organizational Unit Name (eg, section) []:部署名を入力
Common Name (eg, your name or your server's hostname) []:ドメイン名を入力
Email Address []:入力しなくてもいいのでエンター

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:入力しなくてもいいのでエンター
An optional company name []:入力しなくてもいいのでエンター