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.

WindowManager.cpp@0:33d4e66780c0, 2017-02-24 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Feb 24 11:23:12 2017 -0600
Revision:
0:33d4e66780c0
Child:
7:66c5dedc750b
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 0:33d4e66780c0 1 /*******************************************************************************
IanBenzMaxim 0:33d4e66780c0 2 * Copyright (C) 2017 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 0:33d4e66780c0 38 static void deleteWindow(Window * window)
IanBenzMaxim 0:33d4e66780c0 39 {
IanBenzMaxim 0:33d4e66780c0 40 delete window;
IanBenzMaxim 0:33d4e66780c0 41 }
IanBenzMaxim 0:33d4e66780c0 42
IanBenzMaxim 0:33d4e66780c0 43 WindowManager::~WindowManager()
IanBenzMaxim 0:33d4e66780c0 44 {
IanBenzMaxim 0:33d4e66780c0 45 // Free all windows.
IanBenzMaxim 0:33d4e66780c0 46 std::for_each(m_windowStack.begin(), m_windowStack.end(), deleteWindow);
IanBenzMaxim 0:33d4e66780c0 47 std::for_each(m_actionQueue.begin(), m_actionQueue.end(), deleteWindow);
IanBenzMaxim 0:33d4e66780c0 48 }
IanBenzMaxim 0:33d4e66780c0 49
IanBenzMaxim 0:33d4e66780c0 50 void WindowManager::processAction(Window * window)
IanBenzMaxim 0:33d4e66780c0 51 {
IanBenzMaxim 0:33d4e66780c0 52 if (window == NULL)
IanBenzMaxim 0:33d4e66780c0 53 {
IanBenzMaxim 0:33d4e66780c0 54 if (!m_windowStack.empty())
IanBenzMaxim 0:33d4e66780c0 55 {
IanBenzMaxim 0:33d4e66780c0 56 delete m_windowStack.back();
IanBenzMaxim 0:33d4e66780c0 57 m_windowStack.pop_back();
IanBenzMaxim 0:33d4e66780c0 58 }
IanBenzMaxim 0:33d4e66780c0 59 }
IanBenzMaxim 0:33d4e66780c0 60 else
IanBenzMaxim 0:33d4e66780c0 61 {
IanBenzMaxim 0:33d4e66780c0 62 m_windowStack.push_back(window);
IanBenzMaxim 0:33d4e66780c0 63 }
IanBenzMaxim 0:33d4e66780c0 64 }
IanBenzMaxim 0:33d4e66780c0 65
IanBenzMaxim 0:33d4e66780c0 66 Bitmap WindowManager::render() const
IanBenzMaxim 0:33d4e66780c0 67 {
IanBenzMaxim 0:33d4e66780c0 68 return m_windowStack.empty() ? Bitmap(m_width, m_height) : m_windowStack.back()->render();
IanBenzMaxim 0:33d4e66780c0 69 }
IanBenzMaxim 0:33d4e66780c0 70
IanBenzMaxim 0:33d4e66780c0 71 void WindowManager::push(Window * window)
IanBenzMaxim 0:33d4e66780c0 72 {
IanBenzMaxim 0:33d4e66780c0 73 if (window != NULL)
IanBenzMaxim 0:33d4e66780c0 74 {
IanBenzMaxim 0:33d4e66780c0 75 window->setWidth(m_width);
IanBenzMaxim 0:33d4e66780c0 76 window->setHeight(m_height);
IanBenzMaxim 0:33d4e66780c0 77 window->setX(0);
IanBenzMaxim 0:33d4e66780c0 78 window->setY(0);
IanBenzMaxim 0:33d4e66780c0 79 window->setWindowManager(NULL);
IanBenzMaxim 0:33d4e66780c0 80 m_actionQueue.push_back(window);
IanBenzMaxim 0:33d4e66780c0 81 }
IanBenzMaxim 0:33d4e66780c0 82 }
IanBenzMaxim 0:33d4e66780c0 83
IanBenzMaxim 0:33d4e66780c0 84 void WindowManager::pop()
IanBenzMaxim 0:33d4e66780c0 85 {
IanBenzMaxim 0:33d4e66780c0 86 m_actionQueue.push_back(NULL);
IanBenzMaxim 0:33d4e66780c0 87 }
IanBenzMaxim 0:33d4e66780c0 88
IanBenzMaxim 0:33d4e66780c0 89 bool WindowManager::update()
IanBenzMaxim 0:33d4e66780c0 90 {
IanBenzMaxim 0:33d4e66780c0 91 bool redraw = false;
IanBenzMaxim 0:33d4e66780c0 92
IanBenzMaxim 0:33d4e66780c0 93 // Perform all queued push / pop actions.
IanBenzMaxim 0:33d4e66780c0 94 if (!m_actionQueue.empty())
IanBenzMaxim 0:33d4e66780c0 95 {
IanBenzMaxim 0:33d4e66780c0 96 if (!m_windowStack.empty())
IanBenzMaxim 0:33d4e66780c0 97 {
IanBenzMaxim 0:33d4e66780c0 98 m_windowStack.back()->setWindowManager(NULL);
IanBenzMaxim 0:33d4e66780c0 99 }
IanBenzMaxim 0:33d4e66780c0 100 std::for_each(m_actionQueue.begin(), m_actionQueue.end(),
IanBenzMaxim 0:33d4e66780c0 101 std::bind1st(std::mem_fun(&WindowManager::processAction), this));
IanBenzMaxim 0:33d4e66780c0 102 m_actionQueue.clear();
IanBenzMaxim 0:33d4e66780c0 103 if (!m_windowStack.empty())
IanBenzMaxim 0:33d4e66780c0 104 {
IanBenzMaxim 0:33d4e66780c0 105 m_windowStack.back()->setWindowManager(this);
IanBenzMaxim 0:33d4e66780c0 106 }
IanBenzMaxim 0:33d4e66780c0 107 redraw = true;
IanBenzMaxim 0:33d4e66780c0 108 }
IanBenzMaxim 0:33d4e66780c0 109
IanBenzMaxim 0:33d4e66780c0 110 // Update all windows.
IanBenzMaxim 0:33d4e66780c0 111 for (std::vector<Window *>::reverse_iterator it = m_windowStack.rbegin(); it != m_windowStack.rend(); it++)
IanBenzMaxim 0:33d4e66780c0 112 {
IanBenzMaxim 0:33d4e66780c0 113 if ((*it)->update() && (it == m_windowStack.rbegin()))
IanBenzMaxim 0:33d4e66780c0 114 {
IanBenzMaxim 0:33d4e66780c0 115 redraw = true;
IanBenzMaxim 0:33d4e66780c0 116 }
IanBenzMaxim 0:33d4e66780c0 117 }
IanBenzMaxim 0:33d4e66780c0 118
IanBenzMaxim 0:33d4e66780c0 119 return redraw;
IanBenzMaxim 0:33d4e66780c0 120 }
IanBenzMaxim 0:33d4e66780c0 121
IanBenzMaxim 0:33d4e66780c0 122 void WindowManager::processKey(Key key)
IanBenzMaxim 0:33d4e66780c0 123 {
IanBenzMaxim 0:33d4e66780c0 124 if (!m_windowStack.empty())
IanBenzMaxim 0:33d4e66780c0 125 {
IanBenzMaxim 0:33d4e66780c0 126 m_windowStack.back()->processKey(key);
IanBenzMaxim 0:33d4e66780c0 127 }
IanBenzMaxim 0:33d4e66780c0 128 }