_hx509_private_key_ref
cert->private_key = _hx509_private_key_ref(private_key);
_hx509_private_key_ref (hx509_private_key /*key*/);
*key = _hx509_private_key_ref(keys[0]);
(*keys)[i] = _hx509_private_key_ref(mem->keys[i]);
mem->keys[i] = _hx509_private_key_ref(key);