add_extension

static VALUE
ossl_x509_add_extension(VALUE self, VALUE extension)
{
    X509 *x509;
    X509_EXTENSION *ext;

    GetX509(self, x509);
    ext = DupX509ExtPtr(extension);
    if (!X509_add_ext(x509, ext, -1)) { /* DUPs ext - FREE it */
        X509_EXTENSION_free(ext);
        ossl_raise(eX509CertError, NULL);
    }
    X509_EXTENSION_free(ext);

    return extension;
}