void EC_KEY_free(EC_KEY *r)
{
    int i;

    if (r == NULL)
        return;

    i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC);
    REF_PRINT_COUNT("EC_KEY", r);
    if (i > 0)
        return;
    REF_ASSERT_ISNT(i < 0);

    if (r->meth->finish != NULL)
        r->meth->finish(r);

#ifndef OPENSSL_NO_ENGINE
    ENGINE_finish(r->engine);
#endif

    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
    EC_GROUP_free(r->group);
    EC_POINT_free(r->pub_key);
    BN_clear_free(r->priv_key);

    OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
}