Maxim Integrated
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.
Bitmap.hpp@10:71359af61af8, 2017-04-10 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Mon Apr 10 11:55:33 2017 -0500
- Revision:
- 10:71359af61af8
- Parent:
- 0:33d4e66780c0
- Child:
- 11:989eabe2a376
Reduced copying and dynamic allocations during rendering. Added support for partial redrawing of a scene.
Who changed what in which revision?
| User | Revision | Line number | New 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 | #ifndef BITMAP_HPP |
| IanBenzMaxim | 0:33d4e66780c0 | 34 | #define BITMAP_HPP |
| IanBenzMaxim | 0:33d4e66780c0 | 35 | |
| IanBenzMaxim | 0:33d4e66780c0 | 36 | #include <stddef.h> |
| IanBenzMaxim | 0:33d4e66780c0 | 37 | #include <stdint.h> |
| IanBenzMaxim | 0:33d4e66780c0 | 38 | #include <vector> |
| IanBenzMaxim | 0:33d4e66780c0 | 39 | |
| IanBenzMaxim | 0:33d4e66780c0 | 40 | /// Stores a black and white bitmap image for display on the LCD. |
| IanBenzMaxim | 0:33d4e66780c0 | 41 | class Bitmap |
| IanBenzMaxim | 0:33d4e66780c0 | 42 | { |
| IanBenzMaxim | 0:33d4e66780c0 | 43 | public: |
| IanBenzMaxim | 0:33d4e66780c0 | 44 | typedef std::vector<uint8_t> SegmentBuffer; |
| IanBenzMaxim | 0:33d4e66780c0 | 45 | |
| IanBenzMaxim | 0:33d4e66780c0 | 46 | /// Format specifier used when loading image from raw bytes. |
| IanBenzMaxim | 0:33d4e66780c0 | 47 | enum Format |
| IanBenzMaxim | 0:33d4e66780c0 | 48 | { |
| IanBenzMaxim | 0:33d4e66780c0 | 49 | NativeFormat, ///< Native format used by LCD. |
| IanBenzMaxim | 0:33d4e66780c0 | 50 | ScanLineFormat ///< Traditional left to right scan line format. |
| IanBenzMaxim | 0:33d4e66780c0 | 51 | }; |
| IanBenzMaxim | 0:33d4e66780c0 | 52 | |
| IanBenzMaxim | 10:71359af61af8 | 53 | /// Number of pixels contained in a segment. |
| IanBenzMaxim | 0:33d4e66780c0 | 54 | static const int pixelsPerSegment = 8; |
| IanBenzMaxim | 0:33d4e66780c0 | 55 | |
| IanBenzMaxim | 0:33d4e66780c0 | 56 | /// Construct a bitmap with specified dimensions and optionally load from byte array. |
| IanBenzMaxim | 0:33d4e66780c0 | 57 | /// @param width Width in pixels that is >= 1. |
| IanBenzMaxim | 0:33d4e66780c0 | 58 | /// @param height Height in pixels that is >= 1. |
| IanBenzMaxim | 0:33d4e66780c0 | 59 | /// @param data Image data to load. Data size must match the dimensions of the bitmap. |
| IanBenzMaxim | 0:33d4e66780c0 | 60 | /// May be set to NULL to disable loading. |
| IanBenzMaxim | 0:33d4e66780c0 | 61 | /// @param format Format of the image data to load. |
| IanBenzMaxim | 0:33d4e66780c0 | 62 | Bitmap(int width, int height, const uint8_t * data = NULL, Format format = NativeFormat); |
| IanBenzMaxim | 0:33d4e66780c0 | 63 | |
| IanBenzMaxim | 0:33d4e66780c0 | 64 | /// Load image data from a byte array. |
| IanBenzMaxim | 0:33d4e66780c0 | 65 | /// @param data Image data to load. Data size must match the dimensions of the bitmap. |
| IanBenzMaxim | 0:33d4e66780c0 | 66 | /// @param format Format of the image data to load. |
| IanBenzMaxim | 0:33d4e66780c0 | 67 | void load(const uint8_t * data, Format format); |
| IanBenzMaxim | 0:33d4e66780c0 | 68 | |
| IanBenzMaxim | 0:33d4e66780c0 | 69 | int width() const { return m_width; } ///< Width in pixels. |
| IanBenzMaxim | 0:33d4e66780c0 | 70 | int height() const { return m_height; } ///< Height in pixels. |
| IanBenzMaxim | 0:33d4e66780c0 | 71 | const SegmentBuffer & data() const { return m_data; } ///< Image data ready for loading into LCD. |
| IanBenzMaxim | 0:33d4e66780c0 | 72 | |
| IanBenzMaxim | 0:33d4e66780c0 | 73 | /// Check if a pixel is enabled (black). |
| IanBenzMaxim | 0:33d4e66780c0 | 74 | /// @returns True if the pixel is enabled. Returns false if the coordinate is out of range. |
| IanBenzMaxim | 0:33d4e66780c0 | 75 | bool pixelEnabled(int x, int y) const; |
| IanBenzMaxim | 0:33d4e66780c0 | 76 | /// Enable or disable a pixel. |
| IanBenzMaxim | 0:33d4e66780c0 | 77 | /// @param True to set to black. False to set to white. |
| IanBenzMaxim | 0:33d4e66780c0 | 78 | void setPixelEnabled(int x, int y, bool enabled); |
| IanBenzMaxim | 0:33d4e66780c0 | 79 | |
| IanBenzMaxim | 0:33d4e66780c0 | 80 | /// Overlay another bitmap on top of this bitmap. |
| IanBenzMaxim | 0:33d4e66780c0 | 81 | /// @param src Bitmap to overlay. |
| IanBenzMaxim | 0:33d4e66780c0 | 82 | /// @param srcX x-coordinate location to overlay. |
| IanBenzMaxim | 0:33d4e66780c0 | 83 | /// @param srcY y-coordinate location to overlay. |
| IanBenzMaxim | 0:33d4e66780c0 | 84 | void overlay(const Bitmap & src, int srcX, int srcY); |
| IanBenzMaxim | 0:33d4e66780c0 | 85 | |
| IanBenzMaxim | 10:71359af61af8 | 86 | /// Reset to initial state. |
| IanBenzMaxim | 10:71359af61af8 | 87 | void clear(); |
| IanBenzMaxim | 10:71359af61af8 | 88 | |
| IanBenzMaxim | 10:71359af61af8 | 89 | /// Reset region to initial state. |
| IanBenzMaxim | 10:71359af61af8 | 90 | /// @param x,y Coordinates to begin clearing at. |
| IanBenzMaxim | 10:71359af61af8 | 91 | /// @param width,height Dimensions of the cleared region. |
| IanBenzMaxim | 10:71359af61af8 | 92 | void clear(int x, int y, int width, int height); |
| IanBenzMaxim | 10:71359af61af8 | 93 | |
| IanBenzMaxim | 0:33d4e66780c0 | 94 | private: |
| IanBenzMaxim | 0:33d4e66780c0 | 95 | int m_width; |
| IanBenzMaxim | 0:33d4e66780c0 | 96 | int m_height; |
| IanBenzMaxim | 0:33d4e66780c0 | 97 | SegmentBuffer m_data; |
| IanBenzMaxim | 0:33d4e66780c0 | 98 | }; |
| IanBenzMaxim | 0:33d4e66780c0 | 99 | |
| IanBenzMaxim | 0:33d4e66780c0 | 100 | #endif |