Environment: Odoo V8 running on Ubuntu14.04.5 LTS

Q:

The algorithm SHA-1 used by SSL to establish secure communication will be changed by SHA-2 soon in my country (Argentina).

Therefore, before November-2016, it is necessary to update all certificates used by the SSL communications, replacing them with new certificates that use the SHA-2 algorithm.

Is there any procedure or guidance to make this change?. Thks