How to set up VPN client (IPSec Xauth RSA) on Mikrotik/RouterOS?

I would need to configure VPN client on Microrik.
I have such client working on Android (IPSec Xauth RSA, no server certificate verification).
I have no control over the VPN server.
They have just provided necessary certificates along with Username/Password.

What would be the related auth-method for Mikrotik setup?

RouterBOARD 750G r3, fw 6.41.1

Somewhat related:
[1]: http://forum.mikrotik.com/t/ipsec-android-client/77593/1
[2]: http://forum.mikrotik.com/t/feature-request-ipsec-ikev2-rsa-signature-hybrid/110825/1