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/WifiConnectWindow.cpp@17:5926077e5345, 2019-10-04 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Oct 04 12:10:11 2019 -0500
Revision:
17:5926077e5345
Parent:
16:a004191a79ab 
Set pin maps through the mbed configuration system. Added support for MAX32625MBED target. Updated mbed-os to version 5.7.7 for MAX32625 I2C fixes. Consolidated simplelink hook definitions.

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 <memory>
IanBenzMaxim 16:a004191a79ab 34 #include <mbed-os/features/netsocket/TCPSocket.h>
IanBenzMaxim 16:a004191a79ab 35 #include <mbed-os/platform/mbed_wait_api.h>
IanBenzMaxim 0:33d4e66780c0 36 #include "CC3100.hpp"
IanBenzMaxim 0:33d4e66780c0 37 #include "DisplayIdWindow.hpp"
IanBenzMaxim 13:6a6225690c2e 38 #include "ErrorWindow.hpp"
IanBenzMaxim 13:6a6225690c2e 39 #include "MakeFunction.hpp"
IanBenzMaxim 0:33d4e66780c0 40 #include "NormalOperationWindow.hpp"
IanBenzMaxim 0:33d4e66780c0 41 #include "WifiConnectWindow.hpp"
IanBenzMaxim 13:6a6225690c2e 42 #include "WindowManager.hpp"
IanBenzMaxim 0:33d4e66780c0 43
IanBenzMaxim 5:d2c852569e9d 44 static const char wifiSsid[] = "MAXREFDES155";
IanBenzMaxim 5:d2c852569e9d 45 static const char wifiPassword[] = "maxim1234";
IanBenzMaxim 0:33d4e66780c0 46 static const char serverAddress[] = "www.maxim-security.com";
IanBenzMaxim 0:33d4e66780c0 47 static const uint16_t serverPort = 3900;
IanBenzMaxim 0:33d4e66780c0 48
IanBenzMaxim 16:a004191a79ab 49 WifiConnectWindow::WifiConnectWindow() : state(NotStarted) {
IanBenzMaxim 16:a004191a79ab 50 description.setParent(this);
IanBenzMaxim 16:a004191a79ab 51 description.setText("WiFi SSID: " + std::string(wifiSsid) +
IanBenzMaxim 16:a004191a79ab 52 "\nWiFi Password: " + std::string(wifiPassword));
IanBenzMaxim 16:a004191a79ab 53 description.setWordWrap(true);
IanBenzMaxim 16:a004191a79ab 54 backButton.setParent(this);
IanBenzMaxim 16:a004191a79ab 55 backButton.setText("Back");
IanBenzMaxim 16:a004191a79ab 56 backButton.setClickedHandler(
IanBenzMaxim 13:6a6225690c2e 57 makeFunction(this, &WifiConnectWindow::backButtonClicked));
IanBenzMaxim 16:a004191a79ab 58 continueButton.setParent(this);
IanBenzMaxim 16:a004191a79ab 59 continueButton.setText("Connect to WiFi");
IanBenzMaxim 16:a004191a79ab 60 continueButton.setClickedHandler(
IanBenzMaxim 13:6a6225690c2e 61 makeFunction(this, &WifiConnectWindow::continueButtonClicked));
IanBenzMaxim 16:a004191a79ab 62 continueButton.setFocused();
IanBenzMaxim 0:33d4e66780c0 63 }
IanBenzMaxim 0:33d4e66780c0 64
IanBenzMaxim 13:6a6225690c2e 65 void WifiConnectWindow::updated() {
IanBenzMaxim 16:a004191a79ab 66 switch (state) {
IanBenzMaxim 13:6a6225690c2e 67 case NotStarted:
IanBenzMaxim 13:6a6225690c2e 68 break;
IanBenzMaxim 13:6a6225690c2e 69
IanBenzMaxim 13:6a6225690c2e 70 case PreConnect:
IanBenzMaxim 16:a004191a79ab 71 backButton.setParent(NULL);
IanBenzMaxim 16:a004191a79ab 72 continueButton.setParent(NULL);
IanBenzMaxim 16:a004191a79ab 73 description.setText("Connecting to WiFi network...");
IanBenzMaxim 16:a004191a79ab 74 state = WiFiConnect;
IanBenzMaxim 13:6a6225690c2e 75 break;
IanBenzMaxim 13:6a6225690c2e 76
IanBenzMaxim 16:a004191a79ab 77 case WiFiConnect:
IanBenzMaxim 13:6a6225690c2e 78 // Connect to AP.
IanBenzMaxim 16:a004191a79ab 79 if (CC3100::instance().connect(wifiSsid, wifiPassword,
IanBenzMaxim 16:a004191a79ab 80 NSAPI_SECURITY_WPA2) != 0) {
IanBenzMaxim 16:a004191a79ab 81 if (windowManager()) {
IanBenzMaxim 13:6a6225690c2e 82 std::auto_ptr<Window> window(new ErrorWindow("WiFi connect failed"));
IanBenzMaxim 13:6a6225690c2e 83 windowManager()->push(window);
IanBenzMaxim 13:6a6225690c2e 84 }
IanBenzMaxim 13:6a6225690c2e 85 break;
IanBenzMaxim 0:33d4e66780c0 86 }
IanBenzMaxim 13:6a6225690c2e 87
IanBenzMaxim 16:a004191a79ab 88 description.setText("Connecting to server...");
IanBenzMaxim 16:a004191a79ab 89 state = ServerConnect;
IanBenzMaxim 16:a004191a79ab 90 break;
IanBenzMaxim 13:6a6225690c2e 91
IanBenzMaxim 13:6a6225690c2e 92 case ServerConnect: {
IanBenzMaxim 13:6a6225690c2e 93 // Get IP address from DNS lookup.
IanBenzMaxim 13:6a6225690c2e 94 SocketAddress socketAddress;
IanBenzMaxim 16:a004191a79ab 95 if (CC3100::instance().gethostbyname(serverAddress, &socketAddress) != 0) {
IanBenzMaxim 16:a004191a79ab 96 if (windowManager()) {
IanBenzMaxim 13:6a6225690c2e 97 std::auto_ptr<Window> window(new ErrorWindow("Hostname lookup failed"));
IanBenzMaxim 13:6a6225690c2e 98 windowManager()->push(window);
IanBenzMaxim 13:6a6225690c2e 99 }
IanBenzMaxim 13:6a6225690c2e 100 break;
IanBenzMaxim 13:6a6225690c2e 101 }
IanBenzMaxim 13:6a6225690c2e 102
IanBenzMaxim 13:6a6225690c2e 103 // Open socket connection.
IanBenzMaxim 13:6a6225690c2e 104 std::auto_ptr<TCPSocket> socket(new TCPSocket(&CC3100::instance()));
IanBenzMaxim 13:6a6225690c2e 105 socket->set_blocking(false);
IanBenzMaxim 13:6a6225690c2e 106 socketAddress.set_port(serverPort);
IanBenzMaxim 16:a004191a79ab 107 if (socket->connect(socketAddress) != 0) {
IanBenzMaxim 16:a004191a79ab 108 if (windowManager()) {
IanBenzMaxim 13:6a6225690c2e 109 std::auto_ptr<Window> window(new ErrorWindow("Socket connect failed"));
IanBenzMaxim 13:6a6225690c2e 110 windowManager()->push(window);
IanBenzMaxim 13:6a6225690c2e 111 }
IanBenzMaxim 13:6a6225690c2e 112 break;
IanBenzMaxim 13:6a6225690c2e 113 }
IanBenzMaxim 13:6a6225690c2e 114
IanBenzMaxim 16:a004191a79ab 115 if (windowManager()) {
IanBenzMaxim 13:6a6225690c2e 116 windowManager()->pop();
IanBenzMaxim 13:6a6225690c2e 117 std::auto_ptr<Window> window(new NormalOperationWindow(socket));
IanBenzMaxim 13:6a6225690c2e 118 windowManager()->push(window);
IanBenzMaxim 13:6a6225690c2e 119 }
IanBenzMaxim 16:a004191a79ab 120 break;
IanBenzMaxim 16:a004191a79ab 121 }
IanBenzMaxim 13:6a6225690c2e 122 }
IanBenzMaxim 0:33d4e66780c0 123 }
IanBenzMaxim 0:33d4e66780c0 124
IanBenzMaxim 13:6a6225690c2e 125 void WifiConnectWindow::resized() {
IanBenzMaxim 16:a004191a79ab 126 backButton.resize(backButton.preferredWidth(),
IanBenzMaxim 16:a004191a79ab 127 backButton.preferredHeight());
IanBenzMaxim 16:a004191a79ab 128 backButton.move(0, height() - backButton.height());
IanBenzMaxim 16:a004191a79ab 129 continueButton.resize(continueButton.preferredWidth(),
IanBenzMaxim 16:a004191a79ab 130 continueButton.preferredHeight());
IanBenzMaxim 16:a004191a79ab 131 continueButton.move(width() - continueButton.width(),
IanBenzMaxim 16:a004191a79ab 132 height() - continueButton.height());
IanBenzMaxim 16:a004191a79ab 133 description.resize(width(),
IanBenzMaxim 16:a004191a79ab 134 std::min(backButton.y(), continueButton.y()));
IanBenzMaxim 0:33d4e66780c0 135 }
IanBenzMaxim 0:33d4e66780c0 136
IanBenzMaxim 13:6a6225690c2e 137 bool WifiConnectWindow::doProcessKey(Key key) {
IanBenzMaxim 13:6a6225690c2e 138 bool handled;
IanBenzMaxim 13:6a6225690c2e 139 switch (key) {
IanBenzMaxim 13:6a6225690c2e 140 case LeftKey:
IanBenzMaxim 16:a004191a79ab 141 backButton.setFocused();
IanBenzMaxim 13:6a6225690c2e 142 handled = true;
IanBenzMaxim 13:6a6225690c2e 143 break;
IanBenzMaxim 13:6a6225690c2e 144
IanBenzMaxim 13:6a6225690c2e 145 case RightKey:
IanBenzMaxim 16:a004191a79ab 146 continueButton.setFocused();
IanBenzMaxim 13:6a6225690c2e 147 handled = true;
IanBenzMaxim 13:6a6225690c2e 148 break;
IanBenzMaxim 13:6a6225690c2e 149
IanBenzMaxim 13:6a6225690c2e 150 default:
IanBenzMaxim 13:6a6225690c2e 151 handled = false;
IanBenzMaxim 13:6a6225690c2e 152 break;
IanBenzMaxim 13:6a6225690c2e 153 }
IanBenzMaxim 13:6a6225690c2e 154 return handled;
IanBenzMaxim 0:33d4e66780c0 155 }
IanBenzMaxim 0:33d4e66780c0 156
IanBenzMaxim 13:6a6225690c2e 157 void WifiConnectWindow::continueButtonClicked(Button *) {
IanBenzMaxim 16:a004191a79ab 158 if (state == NotStarted) {
IanBenzMaxim 16:a004191a79ab 159 state = PreConnect;
IanBenzMaxim 13:6a6225690c2e 160 }
IanBenzMaxim 0:33d4e66780c0 161 }
IanBenzMaxim 0:33d4e66780c0 162
IanBenzMaxim 13:6a6225690c2e 163 void WifiConnectWindow::backButtonClicked(Button *) {
IanBenzMaxim 16:a004191a79ab 164 if (windowManager()) {
IanBenzMaxim 13:6a6225690c2e 165 windowManager()->pop();
IanBenzMaxim 13:6a6225690c2e 166 std::auto_ptr<Window> window(
IanBenzMaxim 13:6a6225690c2e 167 new DisplayIdWindow(DisplayIdWindow::PreConnectMode));
IanBenzMaxim 13:6a6225690c2e 168 windowManager()->push(window);
IanBenzMaxim 13:6a6225690c2e 169 }
IanBenzMaxim 0:33d4e66780c0 170 }