OSSL_CMP_ATAV_create
res = OSSL_CMP_ATAV_create(OBJ_nid2obj(NID_id_regCtrl_algId),
|| (res = OSSL_CMP_ATAV_create(OBJ_nid2obj(NID_id_regCtrl_rsaKeyLen),
OSSL_CMP_ATAV *OSSL_CMP_ATAV_create(ASN1_OBJECT *type, ASN1_TYPE *value);