X509_add1_ext_i2d
if (X509_add1_ext_i2d(new_x509, NID_ct_precert_poison,
int X509_add1_ext_i2d(X509 *x, int nid, void *value, int crit,
if (!X509_add1_ext_i2d(crt, NID_subject_alt_name, gens, 0, 0))