Maxim Integrated / Mbed 2 deprecated DeepCover Embedded Security in IoT

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@1:e1c7c1c636af, 2016-04-14 (annotated)

Committer:
IanBenzMaxim
Date:
Thu Apr 14 19:48:01 2016 +0000
Revision:
1:e1c7c1c636af
Child:
6:b6bafd0a7013
Add initial source files.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
IanBenzMaxim 1:e1c7c1c636af 1 /*******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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IanBenzMaxim 1:e1c7c1c636af 11 * The above copyright notice and this permission notice shall be included
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IanBenzMaxim 1:e1c7c1c636af 33
IanBenzMaxim 1:e1c7c1c636af 34 #ifndef _SENSORNODE_HPP
IanBenzMaxim 1:e1c7c1c636af 35 #define _SENSORNODE_HPP
IanBenzMaxim 1:e1c7c1c636af 36
IanBenzMaxim 1:e1c7c1c636af 37 #include <cstdint>
IanBenzMaxim 1:e1c7c1c636af 38 #include <cstring>
IanBenzMaxim 1:e1c7c1c636af 39
IanBenzMaxim 1:e1c7c1c636af 40 #include "DS7505.hpp"
IanBenzMaxim 1:e1c7c1c636af 41 #include "MAX44009.hpp"
IanBenzMaxim 1:e1c7c1c636af 42 #include "OneWire_Memory/Authenticators/DS28E15_22_25/DS28E15_22_25.hpp"
IanBenzMaxim 1:e1c7c1c636af 43
IanBenzMaxim 1:e1c7c1c636af 44 class DS2465;
IanBenzMaxim 1:e1c7c1c636af 45 class RomId;
IanBenzMaxim 1:e1c7c1c636af 46 class SensorData;
IanBenzMaxim 1:e1c7c1c636af 47 namespace mbed { class I2C; }
IanBenzMaxim 1:e1c7c1c636af 48
IanBenzMaxim 1:e1c7c1c636af 49 /// Interface to the Authenticated Sensor Node peripheral board.
IanBenzMaxim 1:e1c7c1c636af 50 class SensorNode
IanBenzMaxim 1:e1c7c1c636af 51 {
IanBenzMaxim 1:e1c7c1c636af 52 public:
IanBenzMaxim 1:e1c7c1c636af 53 enum State
IanBenzMaxim 1:e1c7c1c636af 54 {
IanBenzMaxim 1:e1c7c1c636af 55 UnableToCommunicate, ///< I2C or 1-Wire communication failure.
IanBenzMaxim 1:e1c7c1c636af 56 NotProvisioned, ///< DS28E15 has not been provisioned.
IanBenzMaxim 1:e1c7c1c636af 57 NotAuthentic, ///< DS28E15 is not authentic.
IanBenzMaxim 1:e1c7c1c636af 58 Authentic ///< DS218E15 is authentic.
IanBenzMaxim 1:e1c7c1c636af 59 };
IanBenzMaxim 1:e1c7c1c636af 60
IanBenzMaxim 1:e1c7c1c636af 61 /// @param i2c Configured I2C communication interface.
IanBenzMaxim 1:e1c7c1c636af 62 /// @param ds7505_i2c_addr I2C bus address of the DS7505 in mbed format.
IanBenzMaxim 1:e1c7c1c636af 63 /// @param max44009_i2c_addr I2C bus address of the MAX44009 in mbed format.
IanBenzMaxim 1:e1c7c1c636af 64 /// @param ds2465 Interface to DS2465 on the Controller.
IanBenzMaxim 1:e1c7c1c636af 65 SensorNode(mbed::I2C & i2c, std::uint8_t ds7505_i2c_addr, std::uint8_t max44009_i2c_addr, DS2465 & ds2465);
IanBenzMaxim 1:e1c7c1c636af 66
IanBenzMaxim 1:e1c7c1c636af 67 /// Detect if an authentic Sensor Node is connected.
IanBenzMaxim 1:e1c7c1c636af 68 /// @param userEntropy Additional entropy to supply to the RNG.
IanBenzMaxim 1:e1c7c1c636af 69 /// @returns Authentic on success.
IanBenzMaxim 1:e1c7c1c636af 70 State detect(unsigned int userEntropy);
IanBenzMaxim 1:e1c7c1c636af 71
IanBenzMaxim 1:e1c7c1c636af 72 /// Read the current temperature and filter life measurements with authentication.
IanBenzMaxim 1:e1c7c1c636af 73 /// @param userEntropy Additional entropy to supply to the RNG.
IanBenzMaxim 1:e1c7c1c636af 74 /// @param sensorData Measurements output location.
IanBenzMaxim 1:e1c7c1c636af 75 /// @returns Authentic on success.
IanBenzMaxim 1:e1c7c1c636af 76 State authenticatedReadSensorData(unsigned int userEntropy, SensorData & sensorData);
IanBenzMaxim 1:e1c7c1c636af 77
IanBenzMaxim 1:e1c7c1c636af 78 /// Reads the current temperature and filter life measurements.
IanBenzMaxim 1:e1c7c1c636af 79 /// @param sensorData Measurements output location.
IanBenzMaxim 1:e1c7c1c636af 80 /// @returns True on success or false if unable to communicate with a sensor.
IanBenzMaxim 1:e1c7c1c636af 81 bool readSensorData(SensorData & sensorData);
IanBenzMaxim 1:e1c7c1c636af 82
IanBenzMaxim 1:e1c7c1c636af 83 /// Get the ROM ID for this sensor node.
IanBenzMaxim 1:e1c7c1c636af 84 const RomId & romId() const { return ds28e15_22_25.romId; }
IanBenzMaxim 1:e1c7c1c636af 85
IanBenzMaxim 1:e1c7c1c636af 86 /// Get the initial lux measurement for this sensor node.
IanBenzMaxim 1:e1c7c1c636af 87 double initialLux() const { return m_initialLux; }
IanBenzMaxim 1:e1c7c1c636af 88
IanBenzMaxim 1:e1c7c1c636af 89 // Grant access to hardware interfaces for provisioning.
IanBenzMaxim 1:e1c7c1c636af 90 friend class Factory;
IanBenzMaxim 1:e1c7c1c636af 91
IanBenzMaxim 1:e1c7c1c636af 92 private:
IanBenzMaxim 1:e1c7c1c636af 93 /// Authenticated data stored in DS28E15.
IanBenzMaxim 1:e1c7c1c636af 94 struct AuthData
IanBenzMaxim 1:e1c7c1c636af 95 {
IanBenzMaxim 1:e1c7c1c636af 96 static const std::uint8_t initialFilterLife = 100;
IanBenzMaxim 1:e1c7c1c636af 97 DS28E15_22_25::Segment segment;
IanBenzMaxim 1:e1c7c1c636af 98 std::uint8_t & filterLife;
IanBenzMaxim 1:e1c7c1c636af 99 unsigned int pageNum, segmentNum;
IanBenzMaxim 1:e1c7c1c636af 100
IanBenzMaxim 1:e1c7c1c636af 101 AuthData() : filterLife(segment[0]), pageNum(0), segmentNum(0) { reset(); }
IanBenzMaxim 1:e1c7c1c636af 102
IanBenzMaxim 1:e1c7c1c636af 103 void reset()
IanBenzMaxim 1:e1c7c1c636af 104 {
IanBenzMaxim 1:e1c7c1c636af 105 std::memset(segment, 0, segment.length);
IanBenzMaxim 1:e1c7c1c636af 106 filterLife = initialFilterLife;
IanBenzMaxim 1:e1c7c1c636af 107 }
IanBenzMaxim 1:e1c7c1c636af 108 };
IanBenzMaxim 1:e1c7c1c636af 109
IanBenzMaxim 1:e1c7c1c636af 110 /// Padding value used in creation of the Slave Secret.
IanBenzMaxim 1:e1c7c1c636af 111 static const std::uint8_t defaultPaddingByte = 0x00;
IanBenzMaxim 1:e1c7c1c636af 112
IanBenzMaxim 1:e1c7c1c636af 113 /// Indicates hardware RNG is initialized.
IanBenzMaxim 1:e1c7c1c636af 114 static bool rngInitialized;
IanBenzMaxim 1:e1c7c1c636af 115 // Initialize the hardware RNG.
IanBenzMaxim 1:e1c7c1c636af 116 static void initializeRng();
IanBenzMaxim 1:e1c7c1c636af 117
IanBenzMaxim 1:e1c7c1c636af 118 /// Initial lux measurement taken on initialization.
IanBenzMaxim 1:e1c7c1c636af 119 /// Assumed to be the maximum intensity that will be observed.
IanBenzMaxim 1:e1c7c1c636af 120 double m_initialLux;
IanBenzMaxim 1:e1c7c1c636af 121
IanBenzMaxim 1:e1c7c1c636af 122 /// Authenticated data stored on the DS28E15.
IanBenzMaxim 1:e1c7c1c636af 123 AuthData authData;
IanBenzMaxim 1:e1c7c1c636af 124
IanBenzMaxim 1:e1c7c1c636af 125 // Hardware interfaces
IanBenzMaxim 1:e1c7c1c636af 126 DS28E15_22_25 ds28e15_22_25; ///< DS28E15 for authentication.
IanBenzMaxim 1:e1c7c1c636af 127 DS7505 ds7505; ///< DS7505 temperature sensor.
IanBenzMaxim 1:e1c7c1c636af 128 MAX44009 max44009; ///< MAX44009 optical light sensor.
IanBenzMaxim 1:e1c7c1c636af 129 DS2465 & ds2465; ///< Interface to DS2465 on Controller.
IanBenzMaxim 1:e1c7c1c636af 130
IanBenzMaxim 1:e1c7c1c636af 131 /// Initialize sensors for measurement.
IanBenzMaxim 1:e1c7c1c636af 132 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 133 bool initializeSensors();
IanBenzMaxim 1:e1c7c1c636af 134
IanBenzMaxim 1:e1c7c1c636af 135 /// Select the Slave Secret for this Sensor Node in the Controller.
IanBenzMaxim 1:e1c7c1c636af 136 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 137 bool setSecret();
IanBenzMaxim 1:e1c7c1c636af 138
IanBenzMaxim 1:e1c7c1c636af 139 /// Check if the Sensor Board is provisioned.
IanBenzMaxim 1:e1c7c1c636af 140 /// @param provisioned True if the sensor board is provisioned.
IanBenzMaxim 1:e1c7c1c636af 141 /// @returns True if provisioning check was successful.
IanBenzMaxim 1:e1c7c1c636af 142 bool checkProvisioned(bool & provisioned);
IanBenzMaxim 1:e1c7c1c636af 143
IanBenzMaxim 1:e1c7c1c636af 144 /// Check if the Sensor Board is authentic.
IanBenzMaxim 1:e1c7c1c636af 145 /// @param userEntropy Additional entropy to supply to the RNG.
IanBenzMaxim 1:e1c7c1c636af 146 /// @returns True if the Sensor Board passed the authentication check.
IanBenzMaxim 1:e1c7c1c636af 147 bool checkAuthentic(unsigned int userEntropy);
IanBenzMaxim 1:e1c7c1c636af 148
IanBenzMaxim 1:e1c7c1c636af 149 /// Checks if the authenticated data stored in the DS28E15 needs to be updated.
IanBenzMaxim 1:e1c7c1c636af 150 /// Updates the authenticated data if necessary.
IanBenzMaxim 1:e1c7c1c636af 151 /// @param sensorData Current sensor data to check.
IanBenzMaxim 1:e1c7c1c636af 152 /// @returns True on success.
IanBenzMaxim 1:e1c7c1c636af 153 bool checkAndWriteAuthData(SensorData & sensorData);
IanBenzMaxim 1:e1c7c1c636af 154 };
IanBenzMaxim 1:e1c7c1c636af 155
IanBenzMaxim 1:e1c7c1c636af 156 #endif