Hello!
Please, add support SHA512 mode to OpenVPN Client.
If now SHA512 added to RouterOS - how activate?
Please make these types of requests by sending an email to support@mikrotik.com. This is a user to user support board. There are no guarantees that MikroTik Staff will read your post. Always best to contact them direct and ask them to add SHA-2 digests. 
nest, sended, thank you.