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.

Rectangle.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 <algorithm>
IanBenzMaxim 10:71359af61af8 34 #include "Bitmap.hpp"
IanBenzMaxim 0:33d4e66780c0 35 #include "Rectangle.hpp"
IanBenzMaxim 0:33d4e66780c0 36
IanBenzMaxim 8:a0d75dff3c9b 37 static const int minBorderWidth = 1;
IanBenzMaxim 8:a0d75dff3c9b 38
IanBenzMaxim 8:a0d75dff3c9b 39 Rectangle::Rectangle() : m_borderWidth(minBorderWidth) { }
IanBenzMaxim 0:33d4e66780c0 40
IanBenzMaxim 0:33d4e66780c0 41 void Rectangle::setBorderWidth(int borderWidth)
IanBenzMaxim 0:33d4e66780c0 42 {
IanBenzMaxim 8:a0d75dff3c9b 43 m_borderWidth = std::max(borderWidth, minBorderWidth);
IanBenzMaxim 8:a0d75dff3c9b 44 invalidate();
IanBenzMaxim 0:33d4e66780c0 45 }
IanBenzMaxim 0:33d4e66780c0 46
IanBenzMaxim 10:71359af61af8 47 void Rectangle::doRender(Bitmap & bitmap, int xOffset, int yOffset) const
IanBenzMaxim 0:33d4e66780c0 48 {
IanBenzMaxim 0:33d4e66780c0 49 for (int curX = 0; (curX < width()) && (curX < bitmap.width()); curX++)
IanBenzMaxim 0:33d4e66780c0 50 {
IanBenzMaxim 10:71359af61af8 51 for (int curY = 0; (curY < height()) && (curY < bitmap.height()); curY++)
IanBenzMaxim 0:33d4e66780c0 52 {
IanBenzMaxim 0:33d4e66780c0 53 if ((curX < borderWidth()) ||
IanBenzMaxim 0:33d4e66780c0 54 (curX >= (width() - borderWidth())) ||
IanBenzMaxim 0:33d4e66780c0 55 (curY < borderWidth()) ||
IanBenzMaxim 0:33d4e66780c0 56 (curY >= (height() - borderWidth())))
IanBenzMaxim 0:33d4e66780c0 57 {
IanBenzMaxim 10:71359af61af8 58 bitmap.setPixelEnabled(xOffset + x() + curX, yOffset + y() + curY, true);
IanBenzMaxim 0:33d4e66780c0 59 }
IanBenzMaxim 0:33d4e66780c0 60 }
IanBenzMaxim 0:33d4e66780c0 61 }
IanBenzMaxim 0:33d4e66780c0 62 }