SilcSKEStatus
    silc_ske_assemble_security_properties(SilcSKE ske,
                                          SilcSKESecurityPropertyFlag flags,
                                          const char *version,
                                          SilcSKEStartPayload
                                            **return_payload);

    Assembles security properties to Key Exchange Start Payload to be
    sent to the remote end. This checks system wide (SILC system, that is)
    settings and chooses from those. However, if other properties
    should be used this function is easy to replace by another function,
    as, this function is called by the caller of the library and not
    by the SKE library itself. The assembled payload is returned into
    the `return_payload' pointer.