Maxim Integrated / Mbed OS MAXREFDES155#

DeepCover Embedded Security in IoT: Public-key Secured Data Paths

Dependencies:   MaximInterface

The MAXREFDES155# is an internet-of-things (IoT) embedded-security reference design, built to authenticate and control a sensing node using elliptic-curve-based public-key cryptography with control and notification from a web server.

The hardware includes an ARM® mbed™ shield and attached sensor endpoint. The shield contains a DS2476 DeepCover® ECDSA/SHA-2 coprocessor, Wifi communication, LCD push-button controls, and status LEDs. The sensor endpoint is attached to the shield using a 300mm cable and contains a DS28C36 DeepCover ECDSA/SHA-2 authenticator, IR-thermal sensor, and aiming laser for the IR sensor. The MAXREFDES155# is equipped with a standard Arduino® form-factor shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The combination of these two devices represent an IoT device. Communication to the web server is accomplished with the shield Wifi circuitry. Communication from the shield to the attached sensor module is accomplished over I2C . The sensor module represents an IoT endpoint that generates small data with a requirement for message authenticity/integrity and secure on/off operational control.

The design is hierarchical with each mbed platform and shield communicating data from the sensor node to a web server that maintains a centralized log and dispatches notifications as necessary. The simplicity of this design enables rapid integration into any star-topology IoT network to provide security with the low overhead and cost provided by the ECDSA-P256 asymmetric-key and SHA-256 symmetric-key algorithms.

More information about the MAXREFDES155# is available on the Maxim Integrated website.

src/WindowManager.cpp@18:c2631e985780, 2019-12-03 (annotated)

Committer:
IanBenzMaxim
Date:
Tue Dec 03 12:56:25 2019 -0600
Revision:
18:c2631e985780
Parent:
16:a004191a79ab 
Updated MaximInterface to version 2.1.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 /*******************************************************************************
IanBenzMaxim 16:a004191a79ab 2 * Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
IanBenzMaxim 0:33d4e66780c0 3 *
IanBenzMaxim 0:33d4e66780c0 4 * Permission is hereby granted, free of charge, to any person obtaining a
IanBenzMaxim 0:33d4e66780c0 5 * copy of this software and associated documentation files (the "Software"),
IanBenzMaxim 0:33d4e66780c0 6 * to deal in the Software without restriction, including without limitation
IanBenzMaxim 0:33d4e66780c0 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
IanBenzMaxim 0:33d4e66780c0 8 * and/or sell copies of the Software, and to permit persons to whom the
IanBenzMaxim 0:33d4e66780c0 9 * Software is furnished to do so, subject to the following conditions:
IanBenzMaxim 0:33d4e66780c0 10 *
IanBenzMaxim 0:33d4e66780c0 11 * The above copyright notice and this permission notice shall be included
IanBenzMaxim 0:33d4e66780c0 12 * in all copies or substantial portions of the Software.
IanBenzMaxim 0:33d4e66780c0 13 *
IanBenzMaxim 0:33d4e66780c0 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
IanBenzMaxim 0:33d4e66780c0 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
IanBenzMaxim 0:33d4e66780c0 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IanBenzMaxim 0:33d4e66780c0 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
IanBenzMaxim 0:33d4e66780c0 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
IanBenzMaxim 0:33d4e66780c0 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
IanBenzMaxim 0:33d4e66780c0 20 * OTHER DEALINGS IN THE SOFTWARE.
IanBenzMaxim 0:33d4e66780c0 21 *
IanBenzMaxim 0:33d4e66780c0 22 * Except as contained in this notice, the name of Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
IanBenzMaxim 0:33d4e66780c0 24 * Products, Inc. Branding Policy.
IanBenzMaxim 0:33d4e66780c0 25 *
IanBenzMaxim 0:33d4e66780c0 26 * The mere transfer of this software does not imply any licenses
IanBenzMaxim 0:33d4e66780c0 27 * of trade secrets, proprietary technology, copyrights, patents,
IanBenzMaxim 0:33d4e66780c0 28 * trademarks, maskwork rights, or any other form of intellectual
IanBenzMaxim 0:33d4e66780c0 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
IanBenzMaxim 0:33d4e66780c0 30 * ownership rights.
IanBenzMaxim 0:33d4e66780c0 31 *******************************************************************************/
IanBenzMaxim 0:33d4e66780c0 32
IanBenzMaxim 0:33d4e66780c0 33 #include <algorithm>
IanBenzMaxim 0:33d4e66780c0 34 #include <functional>
IanBenzMaxim 0:33d4e66780c0 35 #include "Bitmap.hpp"
IanBenzMaxim 0:33d4e66780c0 36 #include "WindowManager.hpp"
IanBenzMaxim 0:33d4e66780c0 37
IanBenzMaxim 13:6a6225690c2e 38 static void deleteWindow(Window * window) { delete window; }
IanBenzMaxim 0:33d4e66780c0 39
IanBenzMaxim 13:6a6225690c2e 40 WindowManager::~WindowManager() {
IanBenzMaxim 13:6a6225690c2e 41 // Free all windows.
IanBenzMaxim 13:6a6225690c2e 42 std::for_each(windowStack.begin(), windowStack.end(), deleteWindow);
IanBenzMaxim 13:6a6225690c2e 43 std::for_each(actionQueue.begin(), actionQueue.end(), deleteWindow);
IanBenzMaxim 0:33d4e66780c0 44 }
IanBenzMaxim 0:33d4e66780c0 45
IanBenzMaxim 13:6a6225690c2e 46 void WindowManager::processAction(Window * window) {
IanBenzMaxim 16:a004191a79ab 47 if (window) {
IanBenzMaxim 13:6a6225690c2e 48 windowStack.push_back(window);
IanBenzMaxim 16:a004191a79ab 49 } else if (!windowStack.empty()) {
IanBenzMaxim 16:a004191a79ab 50 delete windowStack.back();
IanBenzMaxim 16:a004191a79ab 51 windowStack.pop_back();
IanBenzMaxim 13:6a6225690c2e 52 }
IanBenzMaxim 0:33d4e66780c0 53 }
IanBenzMaxim 0:33d4e66780c0 54
IanBenzMaxim 13:6a6225690c2e 55 void WindowManager::push(std::auto_ptr<Window> & window) {
IanBenzMaxim 16:a004191a79ab 56 if (window.get()) {
IanBenzMaxim 13:6a6225690c2e 57 window->resize(canvas.width(), canvas.height());
IanBenzMaxim 13:6a6225690c2e 58 window->move(0, 0);
IanBenzMaxim 13:6a6225690c2e 59 window->setWindowManager(NULL);
IanBenzMaxim 13:6a6225690c2e 60 actionQueue.push_back(window.release());
IanBenzMaxim 13:6a6225690c2e 61 }
IanBenzMaxim 0:33d4e66780c0 62 }
IanBenzMaxim 0:33d4e66780c0 63
IanBenzMaxim 13:6a6225690c2e 64 void WindowManager::pop() { actionQueue.push_back(NULL); }
IanBenzMaxim 13:6a6225690c2e 65
IanBenzMaxim 13:6a6225690c2e 66 bool WindowManager::update() {
IanBenzMaxim 13:6a6225690c2e 67 bool redraw = false;
IanBenzMaxim 13:6a6225690c2e 68
IanBenzMaxim 13:6a6225690c2e 69 // Perform all queued push / pop actions.
IanBenzMaxim 13:6a6225690c2e 70 if (!actionQueue.empty()) {
IanBenzMaxim 13:6a6225690c2e 71 if (!windowStack.empty()) {
IanBenzMaxim 13:6a6225690c2e 72 windowStack.back()->setWindowManager(NULL);
IanBenzMaxim 0:33d4e66780c0 73 }
IanBenzMaxim 13:6a6225690c2e 74 std::for_each(
IanBenzMaxim 13:6a6225690c2e 75 actionQueue.begin(), actionQueue.end(),
IanBenzMaxim 13:6a6225690c2e 76 std::bind1st(std::mem_fun(&WindowManager::processAction), this));
IanBenzMaxim 13:6a6225690c2e 77 actionQueue.clear();
IanBenzMaxim 13:6a6225690c2e 78 if (windowStack.empty()) {
IanBenzMaxim 13:6a6225690c2e 79 canvas.clear();
IanBenzMaxim 13:6a6225690c2e 80 redraw = true;
IanBenzMaxim 13:6a6225690c2e 81 } else {
IanBenzMaxim 13:6a6225690c2e 82 windowStack.back()->setWindowManager(this);
IanBenzMaxim 0:33d4e66780c0 83 }
IanBenzMaxim 13:6a6225690c2e 84 }
IanBenzMaxim 13:6a6225690c2e 85
IanBenzMaxim 13:6a6225690c2e 86 if (!windowStack.empty()) {
IanBenzMaxim 13:6a6225690c2e 87 // Update all windows. Only allow redraw of the top window.
IanBenzMaxim 13:6a6225690c2e 88 for (std::vector<Window *>::reverse_iterator it = windowStack.rbegin();
IanBenzMaxim 16:a004191a79ab 89 it != windowStack.rend(); ++it) {
IanBenzMaxim 13:6a6225690c2e 90 if ((*it)->update(it == windowStack.rbegin() ? &canvas : NULL)) {
IanBenzMaxim 13:6a6225690c2e 91 redraw = true;
IanBenzMaxim 13:6a6225690c2e 92 }
IanBenzMaxim 13:6a6225690c2e 93 }
IanBenzMaxim 13:6a6225690c2e 94 }
IanBenzMaxim 13:6a6225690c2e 95
IanBenzMaxim 13:6a6225690c2e 96 return redraw;
IanBenzMaxim 0:33d4e66780c0 97 }
IanBenzMaxim 0:33d4e66780c0 98
IanBenzMaxim 13:6a6225690c2e 99 void WindowManager::processKey(Key key) {
IanBenzMaxim 13:6a6225690c2e 100 if (!windowStack.empty()) {
IanBenzMaxim 13:6a6225690c2e 101 windowStack.back()->processKey(key);
IanBenzMaxim 13:6a6225690c2e 102 }
IanBenzMaxim 0:33d4e66780c0 103 }