SilcConnAuth silc_connauth_alloc(SilcSchedule schedule, SilcSKE ske,
                                     SilcUInt32 timeout_secs);

    Allocates the connection authentication protocol context.  The `ske'
    is the successfully completed key exchange context.  The `timeout_secs'
    is the maximum time we are waiting for the protocol to finish before
    it is timedout.  Returns NULL on error.