MAXREFDES143#: DeepCover Embedded Security in IoT Authenticated Sensing & Notification
Dependencies: MaximInterface mbed
The MAXREFDES143# is an Internet of Things (IoT) embedded security reference design, built to protect an industrial sensing node by means of authentication and notification to a web server. The hardware includes a peripheral module representing a protected sensor node monitoring operating temperature and remaining life of a filter (simulated through ambient light sensing) and an mbed shield representing a controller node responsible for monitoring one or more sensor nodes. The design is hierarchical with each controller node communicating data from connected sensor nodes to a web server that maintains a centralized log and dispatches notifications as necessary. The mbed shield contains a Wi-Fi module, a DS2465 coprocessor with 1-Wire® master function, an LCD, LEDs, and pushbuttons. The protected sensor node contains a DS28E15 authenticator, a DS7505 temperature sensor, and a MAX44009 light sensor. The mbed shield communicates to a web server by the onboard Wi-Fi module and to the protected sensor node with I2C and 1-Wire. The MAXREFDES143# is equipped with a standard shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The simplicity of this design enables rapid integration into any star-topology IoT network requiring the heightened security with low overhead provided by the SHA-256 symmetric-key algorithm.
More information about the MAXREFDES143# is available on the Maxim Integrated website.
SensorNode.hpp@35:3d414ba9ab6c, 2018-01-19 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Fri Jan 19 10:33:16 2018 -0600
- Revision:
- 35:3d414ba9ab6c
- Parent:
- 32:0a09505a656d
Updated MaximInterface revision.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
IanBenzMaxim | 1:e1c7c1c636af | 1 | /******************************************************************************* |
IanBenzMaxim | 1:e1c7c1c636af | 2 | * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. |
IanBenzMaxim | 1:e1c7c1c636af | 3 | * |
IanBenzMaxim | 1:e1c7c1c636af | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
IanBenzMaxim | 1:e1c7c1c636af | 5 | * copy of this software and associated documentation files (the "Software"), |
IanBenzMaxim | 1:e1c7c1c636af | 6 | * to deal in the Software without restriction, including without limitation |
IanBenzMaxim | 1:e1c7c1c636af | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
IanBenzMaxim | 1:e1c7c1c636af | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
IanBenzMaxim | 1:e1c7c1c636af | 9 | * Software is furnished to do so, subject to the following conditions: |
IanBenzMaxim | 1:e1c7c1c636af | 10 | * |
IanBenzMaxim | 1:e1c7c1c636af | 11 | * The above copyright notice and this permission notice shall be included |
IanBenzMaxim | 1:e1c7c1c636af | 12 | * in all copies or substantial portions of the Software. |
IanBenzMaxim | 1:e1c7c1c636af | 13 | * |
IanBenzMaxim | 1:e1c7c1c636af | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
IanBenzMaxim | 1:e1c7c1c636af | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
IanBenzMaxim | 1:e1c7c1c636af | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
IanBenzMaxim | 1:e1c7c1c636af | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
IanBenzMaxim | 1:e1c7c1c636af | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
IanBenzMaxim | 1:e1c7c1c636af | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
IanBenzMaxim | 1:e1c7c1c636af | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
IanBenzMaxim | 1:e1c7c1c636af | 21 | * |
IanBenzMaxim | 1:e1c7c1c636af | 22 | * Except as contained in this notice, the name of Maxim Integrated |
IanBenzMaxim | 1:e1c7c1c636af | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
IanBenzMaxim | 1:e1c7c1c636af | 24 | * Products, Inc. Branding Policy. |
IanBenzMaxim | 1:e1c7c1c636af | 25 | * |
IanBenzMaxim | 1:e1c7c1c636af | 26 | * The mere transfer of this software does not imply any licenses |
IanBenzMaxim | 1:e1c7c1c636af | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
IanBenzMaxim | 1:e1c7c1c636af | 28 | * trademarks, maskwork rights, or any other form of intellectual |
IanBenzMaxim | 1:e1c7c1c636af | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
IanBenzMaxim | 1:e1c7c1c636af | 30 | * ownership rights. |
IanBenzMaxim | 32:0a09505a656d | 31 | *******************************************************************************/ |
IanBenzMaxim | 1:e1c7c1c636af | 32 | |
IanBenzMaxim | 24:434330962308 | 33 | #ifndef SENSORNODE_HPP |
IanBenzMaxim | 24:434330962308 | 34 | #define SENSORNODE_HPP |
IanBenzMaxim | 1:e1c7c1c636af | 35 | |
IanBenzMaxim | 6:b6bafd0a7013 | 36 | #include <stdint.h> |
IanBenzMaxim | 32:0a09505a656d | 37 | #include <MaximInterface/Devices/DS28E15_22_25.hpp> |
IanBenzMaxim | 32:0a09505a656d | 38 | #include <MaximInterface/Utilities/RomId.hpp> |
IanBenzMaxim | 32:0a09505a656d | 39 | #include <MaximInterface/Utilities/ManId.hpp> |
IanBenzMaxim | 1:e1c7c1c636af | 40 | #include "DS7505.hpp" |
IanBenzMaxim | 1:e1c7c1c636af | 41 | #include "MAX44009.hpp" |
IanBenzMaxim | 1:e1c7c1c636af | 42 | |
IanBenzMaxim | 1:e1c7c1c636af | 43 | class SensorData; |
IanBenzMaxim | 32:0a09505a656d | 44 | namespace MaximInterface { class DS2465; } |
IanBenzMaxim | 1:e1c7c1c636af | 45 | namespace mbed { class I2C; } |
IanBenzMaxim | 1:e1c7c1c636af | 46 | |
IanBenzMaxim | 1:e1c7c1c636af | 47 | /// Interface to the Authenticated Sensor Node peripheral board. |
IanBenzMaxim | 32:0a09505a656d | 48 | class SensorNode { |
IanBenzMaxim | 1:e1c7c1c636af | 49 | public: |
IanBenzMaxim | 32:0a09505a656d | 50 | enum State { |
IanBenzMaxim | 1:e1c7c1c636af | 51 | UnableToCommunicate, ///< I2C or 1-Wire communication failure. |
IanBenzMaxim | 32:0a09505a656d | 52 | NotProvisioned, ///< DS28E15 has not been provisioned. |
IanBenzMaxim | 32:0a09505a656d | 53 | NotAuthentic, ///< DS28E15 is not authentic. |
IanBenzMaxim | 32:0a09505a656d | 54 | Authentic ///< DS218E15 is authentic. |
IanBenzMaxim | 1:e1c7c1c636af | 55 | }; |
IanBenzMaxim | 32:0a09505a656d | 56 | |
IanBenzMaxim | 1:e1c7c1c636af | 57 | /// @param i2c Configured I2C communication interface. |
IanBenzMaxim | 1:e1c7c1c636af | 58 | /// @param ds7505_i2c_addr I2C bus address of the DS7505 in mbed format. |
IanBenzMaxim | 1:e1c7c1c636af | 59 | /// @param max44009_i2c_addr I2C bus address of the MAX44009 in mbed format. |
IanBenzMaxim | 1:e1c7c1c636af | 60 | /// @param ds2465 Interface to DS2465 on the Controller. |
IanBenzMaxim | 32:0a09505a656d | 61 | SensorNode(mbed::I2C & i2c, uint8_t ds7505_i2c_addr, |
IanBenzMaxim | 32:0a09505a656d | 62 | uint8_t max44009_i2c_addr, MaximInterface::DS2465 & ds2465); |
IanBenzMaxim | 32:0a09505a656d | 63 | |
IanBenzMaxim | 1:e1c7c1c636af | 64 | /// Detect if an authentic Sensor Node is connected. |
IanBenzMaxim | 1:e1c7c1c636af | 65 | /// @param userEntropy Additional entropy to supply to the RNG. |
IanBenzMaxim | 1:e1c7c1c636af | 66 | /// @returns Authentic on success. |
IanBenzMaxim | 1:e1c7c1c636af | 67 | State detect(unsigned int userEntropy); |
IanBenzMaxim | 32:0a09505a656d | 68 | |
IanBenzMaxim | 1:e1c7c1c636af | 69 | /// Read the current temperature and filter life measurements with authentication. |
IanBenzMaxim | 1:e1c7c1c636af | 70 | /// @param userEntropy Additional entropy to supply to the RNG. |
IanBenzMaxim | 1:e1c7c1c636af | 71 | /// @param sensorData Measurements output location. |
IanBenzMaxim | 1:e1c7c1c636af | 72 | /// @returns Authentic on success. |
IanBenzMaxim | 32:0a09505a656d | 73 | State authenticatedReadSensorData(unsigned int userEntropy, |
IanBenzMaxim | 32:0a09505a656d | 74 | SensorData & sensorData); |
IanBenzMaxim | 32:0a09505a656d | 75 | |
IanBenzMaxim | 1:e1c7c1c636af | 76 | /// Reads the current temperature and filter life measurements. |
IanBenzMaxim | 1:e1c7c1c636af | 77 | /// @param sensorData Measurements output location. |
IanBenzMaxim | 1:e1c7c1c636af | 78 | /// @returns True on success or false if unable to communicate with a sensor. |
IanBenzMaxim | 1:e1c7c1c636af | 79 | bool readSensorData(SensorData & sensorData); |
IanBenzMaxim | 32:0a09505a656d | 80 | |
IanBenzMaxim | 1:e1c7c1c636af | 81 | /// Get the ROM ID for this sensor node. |
IanBenzMaxim | 32:0a09505a656d | 82 | const MaximInterface::RomId romId() const { return romId_; } |
IanBenzMaxim | 32:0a09505a656d | 83 | |
IanBenzMaxim | 1:e1c7c1c636af | 84 | /// Get the initial lux measurement for this sensor node. |
IanBenzMaxim | 32:0a09505a656d | 85 | double initialLux() const { return initialLux_; } |
IanBenzMaxim | 32:0a09505a656d | 86 | |
IanBenzMaxim | 1:e1c7c1c636af | 87 | // Grant access to hardware interfaces for provisioning. |
IanBenzMaxim | 32:0a09505a656d | 88 | friend bool provisionCoprocessor(MaximInterface::DS2465 & ds2465); |
IanBenzMaxim | 25:37ea43ff81be | 89 | friend bool provisionSensorNode(SensorNode & sensorNode, bool validSecret); |
IanBenzMaxim | 32:0a09505a656d | 90 | |
IanBenzMaxim | 1:e1c7c1c636af | 91 | private: |
IanBenzMaxim | 1:e1c7c1c636af | 92 | /// Authenticated data stored in DS28E15. |
IanBenzMaxim | 32:0a09505a656d | 93 | struct AuthData { |
IanBenzMaxim | 6:b6bafd0a7013 | 94 | static const uint8_t initialFilterLife = 100; |
IanBenzMaxim | 32:0a09505a656d | 95 | MaximInterface::DS28E15::Segment segment; |
IanBenzMaxim | 32:0a09505a656d | 96 | int pageNum, segmentNum; |
IanBenzMaxim | 32:0a09505a656d | 97 | |
IanBenzMaxim | 32:0a09505a656d | 98 | uint8_t & filterLife() { return segment[0]; } |
IanBenzMaxim | 32:0a09505a656d | 99 | const uint8_t & filterLife() const { return segment[0]; } |
IanBenzMaxim | 32:0a09505a656d | 100 | |
IanBenzMaxim | 32:0a09505a656d | 101 | AuthData() : pageNum(0), segmentNum(0) { reset(); } |
IanBenzMaxim | 32:0a09505a656d | 102 | |
IanBenzMaxim | 32:0a09505a656d | 103 | void reset() { |
IanBenzMaxim | 25:37ea43ff81be | 104 | segment.fill(0); |
IanBenzMaxim | 32:0a09505a656d | 105 | filterLife() = initialFilterLife; |
IanBenzMaxim | 1:e1c7c1c636af | 106 | } |
IanBenzMaxim | 1:e1c7c1c636af | 107 | }; |
IanBenzMaxim | 32:0a09505a656d | 108 | |
IanBenzMaxim | 1:e1c7c1c636af | 109 | /// Padding value used in creation of the Slave Secret. |
IanBenzMaxim | 6:b6bafd0a7013 | 110 | static const uint8_t defaultPaddingByte = 0x00; |
IanBenzMaxim | 32:0a09505a656d | 111 | |
IanBenzMaxim | 32:0a09505a656d | 112 | static const MaximInterface::ManId manId; |
IanBenzMaxim | 32:0a09505a656d | 113 | |
IanBenzMaxim | 1:e1c7c1c636af | 114 | /// Indicates hardware RNG is initialized. |
IanBenzMaxim | 1:e1c7c1c636af | 115 | static bool rngInitialized; |
IanBenzMaxim | 1:e1c7c1c636af | 116 | // Initialize the hardware RNG. |
IanBenzMaxim | 1:e1c7c1c636af | 117 | static void initializeRng(); |
IanBenzMaxim | 32:0a09505a656d | 118 | |
IanBenzMaxim | 1:e1c7c1c636af | 119 | /// Initial lux measurement taken on initialization. |
IanBenzMaxim | 1:e1c7c1c636af | 120 | /// Assumed to be the maximum intensity that will be observed. |
IanBenzMaxim | 32:0a09505a656d | 121 | double initialLux_; |
IanBenzMaxim | 32:0a09505a656d | 122 | |
IanBenzMaxim | 1:e1c7c1c636af | 123 | /// Authenticated data stored on the DS28E15. |
IanBenzMaxim | 1:e1c7c1c636af | 124 | AuthData authData; |
IanBenzMaxim | 32:0a09505a656d | 125 | |
IanBenzMaxim | 1:e1c7c1c636af | 126 | // Hardware interfaces |
IanBenzMaxim | 32:0a09505a656d | 127 | MaximInterface::DS2465 & ds2465; ///< Interface to DS2465 on Controller. |
IanBenzMaxim | 32:0a09505a656d | 128 | MaximInterface::DS28E15 ds28e15; ///< DS28E15 for authentication. |
IanBenzMaxim | 32:0a09505a656d | 129 | MaximInterface::RomId romId_; |
IanBenzMaxim | 32:0a09505a656d | 130 | DS7505 ds7505; ///< DS7505 temperature sensor. |
IanBenzMaxim | 1:e1c7c1c636af | 131 | MAX44009 max44009; ///< MAX44009 optical light sensor. |
IanBenzMaxim | 32:0a09505a656d | 132 | |
IanBenzMaxim | 1:e1c7c1c636af | 133 | /// Initialize sensors for measurement. |
IanBenzMaxim | 1:e1c7c1c636af | 134 | /// @returns True on success. |
IanBenzMaxim | 1:e1c7c1c636af | 135 | bool initializeSensors(); |
IanBenzMaxim | 32:0a09505a656d | 136 | |
IanBenzMaxim | 1:e1c7c1c636af | 137 | /// Select the Slave Secret for this Sensor Node in the Controller. |
IanBenzMaxim | 1:e1c7c1c636af | 138 | /// @returns True on success. |
IanBenzMaxim | 1:e1c7c1c636af | 139 | bool setSecret(); |
IanBenzMaxim | 32:0a09505a656d | 140 | |
IanBenzMaxim | 1:e1c7c1c636af | 141 | /// Check if the Sensor Board is provisioned. |
IanBenzMaxim | 1:e1c7c1c636af | 142 | /// @param provisioned True if the sensor board is provisioned. |
IanBenzMaxim | 1:e1c7c1c636af | 143 | /// @returns True if provisioning check was successful. |
IanBenzMaxim | 1:e1c7c1c636af | 144 | bool checkProvisioned(bool & provisioned); |
IanBenzMaxim | 32:0a09505a656d | 145 | |
IanBenzMaxim | 1:e1c7c1c636af | 146 | /// Check if the Sensor Board is authentic. |
IanBenzMaxim | 1:e1c7c1c636af | 147 | /// @param userEntropy Additional entropy to supply to the RNG. |
IanBenzMaxim | 1:e1c7c1c636af | 148 | /// @returns True if the Sensor Board passed the authentication check. |
IanBenzMaxim | 1:e1c7c1c636af | 149 | bool checkAuthentic(unsigned int userEntropy); |
IanBenzMaxim | 32:0a09505a656d | 150 | |
IanBenzMaxim | 1:e1c7c1c636af | 151 | /// Checks if the authenticated data stored in the DS28E15 needs to be updated. |
IanBenzMaxim | 1:e1c7c1c636af | 152 | /// Updates the authenticated data if necessary. |
IanBenzMaxim | 1:e1c7c1c636af | 153 | /// @param sensorData Current sensor data to check. |
IanBenzMaxim | 1:e1c7c1c636af | 154 | /// @returns True on success. |
IanBenzMaxim | 1:e1c7c1c636af | 155 | bool checkAndWriteAuthData(SensorData & sensorData); |
IanBenzMaxim | 1:e1c7c1c636af | 156 | }; |
IanBenzMaxim | 1:e1c7c1c636af | 157 | |
IanBenzMaxim | 1:e1c7c1c636af | 158 | #endif |