openssl genrsa -aes256 2048 >server.key
Generating RSA private key, 2048 bit long modulus
e is 65537 (0x10001)
Enter pass phrase:（パスワードを入力）
Enter pass phrase for server.key:（server.keyのパスワード）
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) :（都道府県を入力）
Locality Name (eg, city) [Default City]:（市を入力）
Organization Name (eg, company) [Default Company Ltd]:（未入力）
Organizational Unit Name (eg, section) :（未入力）
Common Name (eg, your name or your server's hostname) :（ドメイン名を入力）
Email Address :（未入力）
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password :（未入力）
An optional company name :（未入力）
-----END CERTIFICATE REQUEST-----