Hi Mafiaboy,
Please refer to the online documentation of the WSA by logging into the GUI of the WSA -> Support and Help -> Online Help -> click on the search tab -> Type HTTPS Certificate -> pg 81 Enabling HTTPS proxy. This document will provide you the necessary information in regards to setting up HTTPS and what type of certifcates are supported.
Erik K.
Sincerely,
Erik Kaiser
WSA CSE
WSA Cisco Forums Moderator