How to create wildcard ssl certificate?

[kandalf]

I have a web template on vesta that automatically create an alias for may "domain.com" called "admin.domain.com", but this alias is not in alias field is created by the web templated selected and when I create a SSL certificate it is not included. There are any way to create a ssl certificate automatically for "domain.com" and "admin.domain.com".

How can I create a wildcard ssl certificate?