void wps_kdf(const u8 *key, const u8 *label_prefix, size_t label_prefix_len,
const char *label, u8 *res, size_t res_len);
int wps_derive_keys(struct wps_data *wps);
-void wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
- size_t dev_passwd_len);
+int wps_derive_psk(struct wps_data *wps, const u8 *dev_passwd,
+ size_t dev_passwd_len);
struct wpabuf * wps_decrypt_encr_settings(struct wps_data *wps, const u8 *encr,
size_t encr_len);
void wps_fail_event(struct wps_context *wps, enum wps_msg_type msg,