https://stackoverflow.com/questions/10175812/how-to-create-a-self-signed-certificate-with-openssl
openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 3650 -subj "/C=UA/O=rathole/CN=galtsev.me" -nodes
http://support.qacafe.com/knowledge-base/how-do-i-display-the-contents-of-a-ssl-certificate/
openssl x509 -in cert.pem -noout -text