asn_parse_objid
p = asn_parse_objid(msg, varsz_p, &vp->val.objid, &n_subids);
uchar_t *asn_parse_objid(uchar_t *, size_t *, void *, size_t *);
p = asn_parse_objid(p, msgsz_p, &vp->name, &vp->name_len);