How to post X509 Cert in Selenium ?

[Med G]

I use selenium as a testing framework in winnaker, 

I would like to add a feature to use x509 Certs to login instead of username/password login. Does anyone know how to post x509 certs to Selenium ?

The command I use in curl is this way:

curl  --cert mycert.crt --key mykey.key --cacert ca.crt   https://EXAMPLECOM:8085/applications