* http://www.dest-unreach.org/socat/doc/socat.html#ADDRESS_OPE...
Just create a self-signed certificate:
openssl req -newkey rsa:2048 -nodes -keyout socat.key -x509 -days 1000 \ -subj '/CN=www.mydom.com/O=My Company Name LTD./C=US' -out socat.pem