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/Button.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 "Button.hpp"
IanBenzMaxim 0:33d4e66780c0 34
IanBenzMaxim 13:6a6225690c2e 35 // Border width when button is deselected.
IanBenzMaxim 13:6a6225690c2e 36 static const int deselectedBorderWidth = 1;
IanBenzMaxim 16:a004191a79ab 37
IanBenzMaxim 13:6a6225690c2e 38 // Border width when button is selected.
IanBenzMaxim 13:6a6225690c2e 39 static const int selectedBorderWidth = 2;
IanBenzMaxim 16:a004191a79ab 40
IanBenzMaxim 13:6a6225690c2e 41 // Total width of the border region.
IanBenzMaxim 13:6a6225690c2e 42 static const int borderPadding = selectedBorderWidth + 1;
IanBenzMaxim 0:33d4e66780c0 43
IanBenzMaxim 13:6a6225690c2e 44 Button::Button() {
IanBenzMaxim 16:a004191a79ab 45 border.setParent(this);
IanBenzMaxim 16:a004191a79ab 46 border.setBorderWidth(deselectedBorderWidth);
IanBenzMaxim 16:a004191a79ab 47 label.setParent(this);
IanBenzMaxim 0:33d4e66780c0 48 }
IanBenzMaxim 0:33d4e66780c0 49
IanBenzMaxim 13:6a6225690c2e 50 int Button::preferredWidth() const {
IanBenzMaxim 16:a004191a79ab 51 return label.preferredWidth() + 2 * borderPadding;
IanBenzMaxim 13:6a6225690c2e 52 }
IanBenzMaxim 13:6a6225690c2e 53
IanBenzMaxim 13:6a6225690c2e 54 int Button::preferredHeight() const {
IanBenzMaxim 16:a004191a79ab 55 return label.preferredHeight() + 2 * borderPadding;
IanBenzMaxim 0:33d4e66780c0 56 }
IanBenzMaxim 0:33d4e66780c0 57
IanBenzMaxim 13:6a6225690c2e 58 void Button::focusChanged(bool focused) {
IanBenzMaxim 16:a004191a79ab 59 border.setBorderWidth(focused ? selectedBorderWidth : deselectedBorderWidth);
IanBenzMaxim 13:6a6225690c2e 60 invalidate(); // Ensure border and text are redrawn together.
IanBenzMaxim 0:33d4e66780c0 61 }
IanBenzMaxim 0:33d4e66780c0 62
IanBenzMaxim 13:6a6225690c2e 63 void Button::resized() {
IanBenzMaxim 16:a004191a79ab 64 border.resize(width(), height());
IanBenzMaxim 16:a004191a79ab 65 label.move(borderPadding, borderPadding);
IanBenzMaxim 16:a004191a79ab 66 label.resize(border.width() - 2 * borderPadding,
IanBenzMaxim 16:a004191a79ab 67 border.height() - 2 * borderPadding);
IanBenzMaxim 0:33d4e66780c0 68 }
IanBenzMaxim 0:33d4e66780c0 69
IanBenzMaxim 13:6a6225690c2e 70 bool Button::doProcessKey(Key key) {
IanBenzMaxim 13:6a6225690c2e 71 bool handled = (key == LeftClickKey);
IanBenzMaxim 16:a004191a79ab 72 if (handled && clickedHandler) {
IanBenzMaxim 16:a004191a79ab 73 clickedHandler(this);
IanBenzMaxim 13:6a6225690c2e 74 }
IanBenzMaxim 13:6a6225690c2e 75 return handled;
IanBenzMaxim 0:33d4e66780c0 76 }