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.

main.cpp@10:71359af61af8, 2017-04-10 (annotated)

Committer:
IanBenzMaxim
Date:
Mon Apr 10 11:55:33 2017 -0500
Revision:
10:71359af61af8
Parent:
8:a0d75dff3c9b
Child:
13:6a6225690c2e
Reduced copying and dynamic allocations during rendering. Added support for partial redrawing of a scene.

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 <string>
IanBenzMaxim 0:33d4e66780c0 34 #include <DigitalIn.h>
IanBenzMaxim 0:33d4e66780c0 35 #include <I2C.h>
IanBenzMaxim 0:33d4e66780c0 36 #include "SensorNode.hpp"
IanBenzMaxim 0:33d4e66780c0 37 #include "DS2476.hpp"
IanBenzMaxim 0:33d4e66780c0 38 #include "CC3100.hpp"
IanBenzMaxim 0:33d4e66780c0 39 #include "Display.hpp"
IanBenzMaxim 0:33d4e66780c0 40 #include "Keys.hpp"
IanBenzMaxim 0:33d4e66780c0 41 #include "WindowManager.hpp"
IanBenzMaxim 0:33d4e66780c0 42 #include "InitWindow.hpp"
IanBenzMaxim 0:33d4e66780c0 43
IanBenzMaxim 0:33d4e66780c0 44 static mbed::DigitalIn upButton(D5);
IanBenzMaxim 0:33d4e66780c0 45 static mbed::DigitalIn downButton(D4);
IanBenzMaxim 0:33d4e66780c0 46 static mbed::DigitalIn leftButton(D3);
IanBenzMaxim 0:33d4e66780c0 47 static mbed::DigitalIn rightButton(D2);
IanBenzMaxim 0:33d4e66780c0 48 static mbed::DigitalIn leftClickButton(D1);
IanBenzMaxim 0:33d4e66780c0 49 static mbed::DigitalIn rightClickButton(D0);
IanBenzMaxim 0:33d4e66780c0 50
IanBenzMaxim 0:33d4e66780c0 51 static Display display(D11, D12, D13, D7, D6);
IanBenzMaxim 10:71359af61af8 52 static WindowManager windowManager(display.canvas());
IanBenzMaxim 0:33d4e66780c0 53
IanBenzMaxim 0:33d4e66780c0 54 static mbed::I2C i2c(D14, D15);
IanBenzMaxim 0:33d4e66780c0 55 DS2476 coproc(i2c);
IanBenzMaxim 0:33d4e66780c0 56 SensorNode sensorNode(i2c, coproc);
IanBenzMaxim 0:33d4e66780c0 57
IanBenzMaxim 0:33d4e66780c0 58 std::string webId;
IanBenzMaxim 0:33d4e66780c0 59
IanBenzMaxim 0:33d4e66780c0 60 static bool buttonPressed(mbed::DigitalIn & button);
IanBenzMaxim 0:33d4e66780c0 61
IanBenzMaxim 0:33d4e66780c0 62 int main()
IanBenzMaxim 0:33d4e66780c0 63 {
IanBenzMaxim 0:33d4e66780c0 64 i2c.frequency(100000);
IanBenzMaxim 0:33d4e66780c0 65 display.initialize();
IanBenzMaxim 0:33d4e66780c0 66 // Set initial window.
IanBenzMaxim 7:66c5dedc750b 67 {
IanBenzMaxim 7:66c5dedc750b 68 std::auto_ptr<Window> window(new InitWindow);
IanBenzMaxim 7:66c5dedc750b 69 windowManager.push(window);
IanBenzMaxim 7:66c5dedc750b 70 }
IanBenzMaxim 0:33d4e66780c0 71 while (true)
IanBenzMaxim 0:33d4e66780c0 72 {
IanBenzMaxim 0:33d4e66780c0 73 // Update window manager and redraw screen if necessary.
IanBenzMaxim 10:71359af61af8 74 if (windowManager.update())
IanBenzMaxim 10:71359af61af8 75 {
IanBenzMaxim 10:71359af61af8 76 display.update();
IanBenzMaxim 10:71359af61af8 77 }
IanBenzMaxim 0:33d4e66780c0 78 // Update CC3100 Wi-Fi interface.
IanBenzMaxim 0:33d4e66780c0 79 CC3100::instance().update();
IanBenzMaxim 0:33d4e66780c0 80 // Check if any buttons are pressed.
IanBenzMaxim 0:33d4e66780c0 81 if (buttonPressed(leftClickButton))
IanBenzMaxim 0:33d4e66780c0 82 {
IanBenzMaxim 0:33d4e66780c0 83 windowManager.processKey(LeftClickKey);
IanBenzMaxim 0:33d4e66780c0 84 }
IanBenzMaxim 0:33d4e66780c0 85 else if (buttonPressed(rightClickButton))
IanBenzMaxim 0:33d4e66780c0 86 {
IanBenzMaxim 0:33d4e66780c0 87 windowManager.processKey(RightClickKey);
IanBenzMaxim 0:33d4e66780c0 88 }
IanBenzMaxim 0:33d4e66780c0 89 else if (buttonPressed(upButton))
IanBenzMaxim 0:33d4e66780c0 90 {
IanBenzMaxim 0:33d4e66780c0 91 windowManager.processKey(UpKey);
IanBenzMaxim 0:33d4e66780c0 92 }
IanBenzMaxim 0:33d4e66780c0 93 else if (buttonPressed(downButton))
IanBenzMaxim 0:33d4e66780c0 94 {
IanBenzMaxim 0:33d4e66780c0 95 windowManager.processKey(DownKey);
IanBenzMaxim 0:33d4e66780c0 96 }
IanBenzMaxim 0:33d4e66780c0 97 else if (buttonPressed(leftButton))
IanBenzMaxim 0:33d4e66780c0 98 {
IanBenzMaxim 0:33d4e66780c0 99 windowManager.processKey(LeftKey);
IanBenzMaxim 0:33d4e66780c0 100 }
IanBenzMaxim 0:33d4e66780c0 101 else if (buttonPressed(rightButton))
IanBenzMaxim 0:33d4e66780c0 102 {
IanBenzMaxim 0:33d4e66780c0 103 windowManager.processKey(RightKey);
IanBenzMaxim 0:33d4e66780c0 104 }
IanBenzMaxim 0:33d4e66780c0 105 }
IanBenzMaxim 0:33d4e66780c0 106 }
IanBenzMaxim 0:33d4e66780c0 107
IanBenzMaxim 0:33d4e66780c0 108 /// Checks if button is pressed and waits for release.
IanBenzMaxim 0:33d4e66780c0 109 /// @param button Active low button to check.
IanBenzMaxim 0:33d4e66780c0 110 /// @returns True if pressed.
IanBenzMaxim 0:33d4e66780c0 111 static bool buttonPressed(mbed::DigitalIn & button)
IanBenzMaxim 0:33d4e66780c0 112 {
IanBenzMaxim 0:33d4e66780c0 113 const int buttonPressed = 0; // Active low
IanBenzMaxim 0:33d4e66780c0 114 if (button == buttonPressed)
IanBenzMaxim 0:33d4e66780c0 115 {
IanBenzMaxim 0:33d4e66780c0 116 while (button == buttonPressed) ;
IanBenzMaxim 0:33d4e66780c0 117 return true;
IanBenzMaxim 0:33d4e66780c0 118 }
IanBenzMaxim 0:33d4e66780c0 119 // else
IanBenzMaxim 0:33d4e66780c0 120 return false;
IanBenzMaxim 0:33d4e66780c0 121 }