verify

static VALUE
ossl_x509stctx_verify(VALUE self)
{
    X509_STORE_CTX *ctx;

    GetX509StCtx(self, ctx);
    X509_STORE_CTX_set_ex_data(ctx, stctx_ex_verify_cb_idx,
                               (void *)rb_iv_get(self, "@verify_callback"));

    switch (X509_verify_cert(ctx)) {
      case 1:
        return Qtrue;
      case 0:
        ossl_clear_error();
        return Qfalse;
      default:
        ossl_raise(eX509CertError, NULL);
    }
}