verify

static VALUE
ossl_x509_verify(VALUE self, VALUE key)
{
    X509 *x509;
    EVP_PKEY *pkey;

    GetX509(self, x509);
    pkey = GetPKeyPtr(key);
    ossl_pkey_check_public_key(pkey);
    switch (X509_verify(x509, pkey)) {
      case 1:
        return Qtrue;
      case 0:
        ossl_clear_error();
        return Qfalse;
      default:
        ossl_raise(eX509CertError, NULL);
    }
}