How can I change crypto service provider and change algorithm of encryption?

I have installed SoapUI 5.5.0. To test my endpoint with configured WS-Security based on Certificate I setup my SoapUI project Outgoing WS-Security configurations like this.

I setup Encryption -> Keystore and select pkcs #12 file (pfx) with my Private key and Public key Certificate issued by the same CA as issued certificate for web server (IIS) on which tested Web Service is deployed.

So my question is how I have to configure trust store on which root and intermediate certificates are stored? How SoapUI verifies chain of certificates? How I can change encryption algorithm and select required cryptoservice provider?