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/main.cpp@16:a004191a79ab, 2019-10-03 (annotated)

Committer:
IanBenzMaxim
Date:
Thu Oct 03 11:40:13 2019 -0500
Revision:
16:a004191a79ab
Parent:
main.cpp@13:6a6225690c2e
Child:
17:5926077e5345
Updated MaximInterface to version 2.0. Updated mbed-os to version 5.5.7. Cleaned up code styling.

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 <string>
IanBenzMaxim 16:a004191a79ab 34 #include <MaximInterfaceDevices/DS28C36_DS2476.hpp>
IanBenzMaxim 16:a004191a79ab 35 #include <MaximInterfaceMbed/I2CMaster.hpp>
IanBenzMaxim 16:a004191a79ab 36 #include <MaximInterfaceMbed/Sleep.hpp>
IanBenzMaxim 16:a004191a79ab 37 #include <mbed-os/drivers/DigitalIn.h>
IanBenzMaxim 16:a004191a79ab 38 #include <mbed-os/drivers/I2C.h>
IanBenzMaxim 0:33d4e66780c0 39 #include "CC3100.hpp"
IanBenzMaxim 0:33d4e66780c0 40 #include "Display.hpp"
IanBenzMaxim 13:6a6225690c2e 41 #include "InitWindow.hpp"
IanBenzMaxim 0:33d4e66780c0 42 #include "Keys.hpp"
IanBenzMaxim 13:6a6225690c2e 43 #include "SensorNode.hpp"
IanBenzMaxim 0:33d4e66780c0 44 #include "WindowManager.hpp"
IanBenzMaxim 0:33d4e66780c0 45
IanBenzMaxim 0:33d4e66780c0 46 static mbed::DigitalIn upButton(D5);
IanBenzMaxim 0:33d4e66780c0 47 static mbed::DigitalIn downButton(D4);
IanBenzMaxim 0:33d4e66780c0 48 static mbed::DigitalIn leftButton(D3);
IanBenzMaxim 0:33d4e66780c0 49 static mbed::DigitalIn rightButton(D2);
IanBenzMaxim 0:33d4e66780c0 50 static mbed::DigitalIn leftClickButton(D1);
IanBenzMaxim 0:33d4e66780c0 51 static mbed::DigitalIn rightClickButton(D0);
IanBenzMaxim 0:33d4e66780c0 52
IanBenzMaxim 0:33d4e66780c0 53 static Display display(D11, D12, D13, D7, D6);
IanBenzMaxim 10:71359af61af8 54 static WindowManager windowManager(display.canvas());
IanBenzMaxim 0:33d4e66780c0 55
IanBenzMaxim 13:6a6225690c2e 56 static mbed::I2C mbedI2C(D14, D15);
IanBenzMaxim 16:a004191a79ab 57 static MaximInterfaceMbed::I2CMaster i2c(mbedI2C);
IanBenzMaxim 16:a004191a79ab 58 static MaximInterfaceMbed::Sleep sleep;
IanBenzMaxim 16:a004191a79ab 59 MaximInterfaceDevices::DS2476 coproc(sleep, i2c);
IanBenzMaxim 16:a004191a79ab 60 SensorNode sensorNode(sleep, i2c, coproc);
IanBenzMaxim 0:33d4e66780c0 61
IanBenzMaxim 0:33d4e66780c0 62 std::string webId;
IanBenzMaxim 0:33d4e66780c0 63
IanBenzMaxim 0:33d4e66780c0 64 static bool buttonPressed(mbed::DigitalIn & button);
IanBenzMaxim 0:33d4e66780c0 65
IanBenzMaxim 13:6a6225690c2e 66 int main() {
IanBenzMaxim 13:6a6225690c2e 67 mbedI2C.frequency(100000);
IanBenzMaxim 13:6a6225690c2e 68 display.initialize();
IanBenzMaxim 13:6a6225690c2e 69 // Set initial window.
IanBenzMaxim 13:6a6225690c2e 70 {
IanBenzMaxim 16:a004191a79ab 71 std::auto_ptr<Window> window(new InitWindow(InitWindow::InitMode));
IanBenzMaxim 13:6a6225690c2e 72 windowManager.push(window);
IanBenzMaxim 13:6a6225690c2e 73 }
IanBenzMaxim 13:6a6225690c2e 74 while (true) {
IanBenzMaxim 13:6a6225690c2e 75 // Update window manager and redraw screen if necessary.
IanBenzMaxim 13:6a6225690c2e 76 if (windowManager.update()) {
IanBenzMaxim 13:6a6225690c2e 77 display.update();
IanBenzMaxim 7:66c5dedc750b 78 }
IanBenzMaxim 13:6a6225690c2e 79 // Update CC3100 Wi-Fi interface.
IanBenzMaxim 13:6a6225690c2e 80 CC3100::instance().update();
IanBenzMaxim 13:6a6225690c2e 81 // Check if any buttons are pressed.
IanBenzMaxim 13:6a6225690c2e 82 if (buttonPressed(leftClickButton)) {
IanBenzMaxim 13:6a6225690c2e 83 windowManager.processKey(LeftClickKey);
IanBenzMaxim 13:6a6225690c2e 84 } else if (buttonPressed(rightClickButton)) {
IanBenzMaxim 13:6a6225690c2e 85 windowManager.processKey(RightClickKey);
IanBenzMaxim 13:6a6225690c2e 86 } else if (buttonPressed(upButton)) {
IanBenzMaxim 13:6a6225690c2e 87 windowManager.processKey(UpKey);
IanBenzMaxim 13:6a6225690c2e 88 } else if (buttonPressed(downButton)) {
IanBenzMaxim 13:6a6225690c2e 89 windowManager.processKey(DownKey);
IanBenzMaxim 13:6a6225690c2e 90 } else if (buttonPressed(leftButton)) {
IanBenzMaxim 13:6a6225690c2e 91 windowManager.processKey(LeftKey);
IanBenzMaxim 13:6a6225690c2e 92 } else if (buttonPressed(rightButton)) {
IanBenzMaxim 13:6a6225690c2e 93 windowManager.processKey(RightKey);
IanBenzMaxim 0:33d4e66780c0 94 }
IanBenzMaxim 13:6a6225690c2e 95 }
IanBenzMaxim 0:33d4e66780c0 96 }
IanBenzMaxim 0:33d4e66780c0 97
IanBenzMaxim 16:a004191a79ab 98 /// @brief Checks if button is pressed and waits for release.
IanBenzMaxim 0:33d4e66780c0 99 /// @param button Active low button to check.
IanBenzMaxim 0:33d4e66780c0 100 /// @returns True if pressed.
IanBenzMaxim 13:6a6225690c2e 101 static bool buttonPressed(mbed::DigitalIn & button) {
IanBenzMaxim 13:6a6225690c2e 102 const int buttonPressed = 0; // Active low
IanBenzMaxim 13:6a6225690c2e 103 if (button == buttonPressed) {
IanBenzMaxim 13:6a6225690c2e 104 while (button == buttonPressed);
IanBenzMaxim 13:6a6225690c2e 105 return true;
IanBenzMaxim 13:6a6225690c2e 106 }
IanBenzMaxim 13:6a6225690c2e 107 // else
IanBenzMaxim 13:6a6225690c2e 108 return false;
IanBenzMaxim 0:33d4e66780c0 109 }