static void prov_data()

in nimble/host/mesh/src/prov_device.c [463:552]

• 70 lines of code
• 10 McCabe index (conditional complexity)

static void prov_data(const uint8_t *data)
{
	struct os_mbuf *msg = PROV_BUF(PDU_LEN_COMPLETE);
	uint8_t session_key[16];
	uint8_t nonce[13];
	uint8_t dev_key[16];
	uint8_t pdu[25];
	uint8_t flags;
	uint32_t iv_index;
	uint16_t addr;
	uint16_t net_idx;
	int err;
	bool identity_enable;

	BT_DBG("");

	err = bt_mesh_session_key(bt_mesh_prov_link.dhkey,
				  bt_mesh_prov_link.prov_salt, session_key);
	if (err) {
		BT_ERR("Unable to generate session key");
		prov_fail(PROV_ERR_UNEXP_ERR);
		return;
	}

	BT_DBG("SessionKey: %s", bt_hex(session_key, 16));

	err = bt_mesh_prov_nonce(bt_mesh_prov_link.dhkey,
				 bt_mesh_prov_link.prov_salt, nonce);
	if (err) {
		BT_ERR("Unable to generate session nonce");
		prov_fail(PROV_ERR_UNEXP_ERR);
		return;
	}

	BT_DBG("Nonce: %s", bt_hex(nonce, 13));

	err = bt_mesh_prov_decrypt(session_key, nonce, data, pdu);
	if (err) {
		BT_ERR("Unable to decrypt provisioning data");
		prov_fail(PROV_ERR_DECRYPT);
		return;
	}

	err = bt_mesh_dev_key(bt_mesh_prov_link.dhkey,
			      bt_mesh_prov_link.prov_salt, dev_key);
	if (err) {
		BT_ERR("Unable to generate device key");
		prov_fail(PROV_ERR_UNEXP_ERR);
		return;
	}

	BT_DBG("DevKey: %s", bt_hex(dev_key, 16));

	net_idx = sys_get_be16(&pdu[16]);
	flags = pdu[18];
	iv_index = sys_get_be32(&pdu[19]);
	addr = sys_get_be16(&pdu[23]);

	BT_DBG("net_idx %u iv_index 0x%08x, addr 0x%04x",
	       net_idx, iv_index, addr);

	bt_mesh_prov_buf_init(msg, PROV_COMPLETE);
	if (bt_mesh_prov_send(msg, NULL)) {
		BT_ERR("Failed to send Provisioning Complete");
		return;
	}

	/* Ignore any further PDUs on this link */
	bt_mesh_prov_link.expect = PROV_NO_PDU;

	/* Store info, since bt_mesh_provision() will end up clearing it */
	if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY)) {
		identity_enable = is_pb_gatt();
	} else {
		identity_enable = false;
	}

	err = bt_mesh_provision(pdu, net_idx, flags, iv_index, addr, dev_key);
	if (err) {
		BT_ERR("Failed to provision (err %d)", err);
		return;
	}

	/* After PB-GATT provisioning we should start advertising
	 * using Node Identity.
	 */
	if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) && identity_enable) {
		bt_mesh_proxy_identity_enable();
	}
}