OpenSSL::X509::Certificate.new

static VALUE
ossl_x509_initialize(int argc, VALUE *argv, VALUE self)
{
    BIO *in;
    X509 *x509;
    VALUE arg;

    rb_scan_args(argc, argv, "01", &arg);
    ossl_want_uninitialized(self, &ossl_x509_type);
    if (argc == 0) {
        x509 = X509_new();
        if (!x509)
            ossl_raise(eX509CertError, "X509_new");
        RTYPEDDATA_DATA(self) = x509;
        return self;
    }
    arg = ossl_to_der_if_possible(arg);
    in = ossl_obj2bio(&arg);
    x509 = d2i_X509_bio(in, NULL);
    if (!x509) {
        OSSL_BIO_reset(in);
        x509 = PEM_read_bio_X509(in, NULL, NULL, NULL);
    }
    BIO_free(in);
    if (!x509)
        ossl_raise(eX509CertError, "PEM_read_bio_X509");

    RTYPEDDATA_DATA(self) = x509;

    return self;
}