OpenSSL::Netscape::SPKI#challenge

static VALUE
ossl_spki_get_challenge(VALUE self)
{
    NETSCAPE_SPKI *spki;

    GetSPKI(self, spki);
    if (spki->spkac->challenge->length <= 0) {
        OSSL_Debug("Challenge.length <= 0?");
        return rb_str_new(0, 0);
    }

    return rb_str_new((const char *)spki->spkac->challenge->data,
                      spki->spkac->challenge->length);
}