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just change out app_name for your purposes

openssl genrsa 2048 > app_name-wildcard.key

openssl req -new -x509 -nodes -sha1 -days 3650 -key app_name-wildcard.key > app_name-wildcard.cert

# Common Name (eg, your name or your server's hostname) []:*.app_name.com

openssl x509 -noout -fingerprint -text < app_name-wildcard.cert > app_name-wildcard.info

cat app_name-wildcard.cert app_name-wildcard.key > app_name-wildcard.pem

chmod 644 app_name-wildcard.key app_name-wildcard.pem

example nginx conf below

# SSL

server {
  listen 443;
    server_name *.app_name.com;

    ssl                  on;
    ssl_certificate      /etc/nginx/ssl/app_name-wildcard.pem;
    ssl_certificate_key  /etc/nginx/ssl/app_name-wildcard.key;
    ssl_session_timeout  5m;

}