docs: protected <T extends SAMLObject> void prepareSecurityParametersContext(final SamlRegisteredServiceServiceProviderMetadataFacade adaptor,
                                                                             final MessageContext<T> outboundContext,
                                                                             final SamlRegisteredService service) {
          val secParametersContext = outboundContext.getSubcontext(SecurityParametersContext.class, true);
          val roleDesc = adaptor.getSsoDescriptor();
          val signingParameters = buildSignatureSigningParameters(roleDesc, service);
          secParametersContext.setSignatureSigningParameters(signingParameters);
      }