SAML 2.0 Identity Provider support for RSS-OAEP / PSS

Hi everyone

I’m trying to setup a SAML Identity Broker to work to an external IDP.
The IDP requires the algorithms RSS-OAEP / PSS for signature and encryption, respectively.
I didn’t find in the documentation how to add them so that the Broker can properly send the message by using those required constraints. There was only a mention of a support in JWT, but it is not the case.

I would appreciate any hint.

Thanks very much,