UBS_RSAPRIV_PAR_P
msglen = ubsec_ksigbits(&krp->krp_param[UBS_RSAPRIV_PAR_P]);
bcopy(krp->krp_param[UBS_RSAPRIV_PAR_P].crp_p,
(krp->krp_param[UBS_RSAPRIV_PAR_P].crp_nbits + 7) / 8);