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.cpp@8:594529956266, 2016-05-14 (annotated)

Committer:
IanBenzMaxim
Date:
Sat May 14 14:28:31 2016 -0500
Revision:
8:594529956266
Parent:
7:e24f0b29f1f7
Child:
9:bc3d211d75ce
Updated following downstream restructuring in OneWire library.

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.
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 1:e1c7c1c636af 31 *******************************************************************************
IanBenzMaxim 1:e1c7c1c636af 32 */
IanBenzMaxim 1:e1c7c1c636af 33
IanBenzMaxim 1:e1c7c1c636af 34 #include "SensorNode.hpp"
IanBenzMaxim 1:e1c7c1c636af 35 #include "common.hpp"
IanBenzMaxim 8:594529956266 36 #include "RomCommands.h"
IanBenzMaxim 6:b6bafd0a7013 37 #include "Masters/DS2465/DS2465.h"
IanBenzMaxim 6:b6bafd0a7013 38 #include "I2C.h"
IanBenzMaxim 1:e1c7c1c636af 39
IanBenzMaxim 1:e1c7c1c636af 40 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 41 #include "max32600.h"
IanBenzMaxim 1:e1c7c1c636af 42 #include "clkman_regs.h"
IanBenzMaxim 1:e1c7c1c636af 43 #include "tpu_regs.h"
IanBenzMaxim 1:e1c7c1c636af 44 #else
IanBenzMaxim 1:e1c7c1c636af 45 #include <cstdlib>
IanBenzMaxim 1:e1c7c1c636af 46 #endif
IanBenzMaxim 1:e1c7c1c636af 47
IanBenzMaxim 8:594529956266 48 using namespace OneWire;
IanBenzMaxim 8:594529956266 49 using namespace OneWire::RomCommands;
IanBenzMaxim 6:b6bafd0a7013 50
IanBenzMaxim 1:e1c7c1c636af 51 bool SensorNode::rngInitialized = false;
IanBenzMaxim 1:e1c7c1c636af 52
IanBenzMaxim 1:e1c7c1c636af 53 void SensorNode::initializeRng()
IanBenzMaxim 1:e1c7c1c636af 54 {
IanBenzMaxim 1:e1c7c1c636af 55 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 56 MXC_CLKMAN->clk_config |= (MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_ENABLE | MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_RESET_N); // Enable crypto oscillator
IanBenzMaxim 1:e1c7c1c636af 57 while ((MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_CRYPTO_STABLE) != MXC_F_CLKMAN_INTFL_CRYPTO_STABLE) ; // Wait for crypto oscillator stability
IanBenzMaxim 1:e1c7c1c636af 58 MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_CRYPTO_GATE_N; // Disable crypto clock gating
IanBenzMaxim 1:e1c7c1c636af 59 MXC_CLKMAN->crypt_clk_ctrl_2_prng = MXC_CLKMAN->clk_ctrl_10_prng = 1; // Set PRNG clock to crypto clock
IanBenzMaxim 1:e1c7c1c636af 60 MXC_CLKMAN->clk_gate_ctrl2 |= (1 << MXC_F_CLKMAN_CLK_GATE_CTRL2_TPU_CLK_GATER_POS); // Use dynamic clock gating
IanBenzMaxim 1:e1c7c1c636af 61 #endif
IanBenzMaxim 1:e1c7c1c636af 62 }
IanBenzMaxim 1:e1c7c1c636af 63
IanBenzMaxim 6:b6bafd0a7013 64 SensorNode::SensorNode(mbed::I2C & i2c, uint8_t ds7505_i2c_addr, uint8_t max44009_i2c_addr, DS2465 & ds2465)
IanBenzMaxim 1:e1c7c1c636af 65 : m_initialLux(1), ds28e15_22_25(ds2465), ds7505(i2c, ds7505_i2c_addr), max44009(i2c, max44009_i2c_addr), ds2465(ds2465)
IanBenzMaxim 1:e1c7c1c636af 66 {
IanBenzMaxim 1:e1c7c1c636af 67 if (!rngInitialized)
IanBenzMaxim 1:e1c7c1c636af 68 {
IanBenzMaxim 1:e1c7c1c636af 69 initializeRng();
IanBenzMaxim 1:e1c7c1c636af 70 rngInitialized = true;
IanBenzMaxim 1:e1c7c1c636af 71 }
IanBenzMaxim 1:e1c7c1c636af 72 }
IanBenzMaxim 1:e1c7c1c636af 73
IanBenzMaxim 1:e1c7c1c636af 74 bool SensorNode::initializeSensors()
IanBenzMaxim 1:e1c7c1c636af 75 {
IanBenzMaxim 1:e1c7c1c636af 76 return (max44009.read_current_lux(m_initialLux) == MAX44009::Success);
IanBenzMaxim 1:e1c7c1c636af 77 }
IanBenzMaxim 1:e1c7c1c636af 78
IanBenzMaxim 1:e1c7c1c636af 79 bool SensorNode::setSecret()
IanBenzMaxim 1:e1c7c1c636af 80 {
IanBenzMaxim 1:e1c7c1c636af 81 DS28E15_22_25::Scratchpad scratchpad;
IanBenzMaxim 1:e1c7c1c636af 82 DS28E15_22_25::Page pageData;
IanBenzMaxim 1:e1c7c1c636af 83
IanBenzMaxim 1:e1c7c1c636af 84 // Create constant partial secret
IanBenzMaxim 1:e1c7c1c636af 85 std::memset(scratchpad, defaultPaddingByte, scratchpad.length);
IanBenzMaxim 1:e1c7c1c636af 86 // Read page data
IanBenzMaxim 1:e1c7c1c636af 87 bool result = (ds2465.readMemory(DS2465::ADDR_USER_MEM_PAGE_0, pageData, pageData.length, false) == OneWireMaster::Success);
IanBenzMaxim 1:e1c7c1c636af 88 // Calculate secret
IanBenzMaxim 1:e1c7c1c636af 89 if (result)
IanBenzMaxim 1:e1c7c1c636af 90 {
IanBenzMaxim 6:b6bafd0a7013 91 result = (DS28E15_22_25::computeNextSecret(ds2465, pageData, authData.pageNum, scratchpad, ds28e15_22_25.romId, ds28e15_22_25.manId) == ISha256MacCoproc::Success);
IanBenzMaxim 1:e1c7c1c636af 92 }
IanBenzMaxim 1:e1c7c1c636af 93 return result;
IanBenzMaxim 1:e1c7c1c636af 94 }
IanBenzMaxim 1:e1c7c1c636af 95
IanBenzMaxim 1:e1c7c1c636af 96 bool SensorNode::checkProvisioned(bool & provisioned)
IanBenzMaxim 1:e1c7c1c636af 97 {
IanBenzMaxim 1:e1c7c1c636af 98 DS28E15_22_25::BlockProtection protectionStatus;
IanBenzMaxim 1:e1c7c1c636af 99 bool result;
IanBenzMaxim 1:e1c7c1c636af 100
IanBenzMaxim 1:e1c7c1c636af 101 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 102 result = (OWSkipRom(ds2465) == OneWireMaster::Success);
IanBenzMaxim 1:e1c7c1c636af 103 if (result)
IanBenzMaxim 1:e1c7c1c636af 104 result = (ds28e15_22_25.readBlockProtection(0, protectionStatus) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 105 if (result)
IanBenzMaxim 1:e1c7c1c636af 106 {
IanBenzMaxim 1:e1c7c1c636af 107 if (!protectionStatus.noProtection())
IanBenzMaxim 1:e1c7c1c636af 108 {
IanBenzMaxim 1:e1c7c1c636af 109 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 110 result = (OWSkipRom(ds2465) == OneWireMaster::Success);
IanBenzMaxim 1:e1c7c1c636af 111 if (result)
IanBenzMaxim 1:e1c7c1c636af 112 result = (ds28e15_22_25.readSegment(authData.pageNum, authData.segmentNum, authData.segment) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 113 if (result)
IanBenzMaxim 1:e1c7c1c636af 114 provisioned = true;
IanBenzMaxim 1:e1c7c1c636af 115 }
IanBenzMaxim 1:e1c7c1c636af 116 else
IanBenzMaxim 1:e1c7c1c636af 117 {
IanBenzMaxim 1:e1c7c1c636af 118 provisioned = false;
IanBenzMaxim 1:e1c7c1c636af 119 }
IanBenzMaxim 1:e1c7c1c636af 120 }
IanBenzMaxim 1:e1c7c1c636af 121 return result;
IanBenzMaxim 1:e1c7c1c636af 122 }
IanBenzMaxim 1:e1c7c1c636af 123
IanBenzMaxim 1:e1c7c1c636af 124 bool SensorNode::checkAuthentic(unsigned int userEntropy)
IanBenzMaxim 1:e1c7c1c636af 125 {
IanBenzMaxim 1:e1c7c1c636af 126 DS28E15_22_25::Scratchpad challenge;
IanBenzMaxim 1:e1c7c1c636af 127 DS28E15_22_25::Page pageData;
IanBenzMaxim 1:e1c7c1c636af 128
IanBenzMaxim 1:e1c7c1c636af 129 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 130 if (OWSkipRom(ds2465) != OneWireMaster::Success)
IanBenzMaxim 1:e1c7c1c636af 131 return false;
IanBenzMaxim 1:e1c7c1c636af 132 // Read page data
IanBenzMaxim 1:e1c7c1c636af 133 if (ds28e15_22_25.readPage(authData.pageNum, pageData, false) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 134 return false;
IanBenzMaxim 1:e1c7c1c636af 135
IanBenzMaxim 1:e1c7c1c636af 136 // Create random challenge
IanBenzMaxim 1:e1c7c1c636af 137 // Use hardare RNG on MAX32600
IanBenzMaxim 1:e1c7c1c636af 138 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 139 MXC_TPU->prng_user_entropy = userEntropy;
IanBenzMaxim 1:e1c7c1c636af 140 #else
IanBenzMaxim 1:e1c7c1c636af 141 std::srand(userEntropy);
IanBenzMaxim 1:e1c7c1c636af 142 #endif
IanBenzMaxim 6:b6bafd0a7013 143 for (size_t i = 0; i < challenge.length; i++)
IanBenzMaxim 1:e1c7c1c636af 144 {
IanBenzMaxim 1:e1c7c1c636af 145 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 146 challenge[i] = MXC_TPU->prng_rnd_num;
IanBenzMaxim 1:e1c7c1c636af 147 #else
IanBenzMaxim 1:e1c7c1c636af 148 challenge[i] = std::rand();
IanBenzMaxim 1:e1c7c1c636af 149 #endif
IanBenzMaxim 1:e1c7c1c636af 150 }
IanBenzMaxim 1:e1c7c1c636af 151
IanBenzMaxim 1:e1c7c1c636af 152 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 153 if (OWSkipRom(ds2465) != OneWireMaster::Success)
IanBenzMaxim 1:e1c7c1c636af 154 return false;
IanBenzMaxim 1:e1c7c1c636af 155 // Write challenge to scratchpad
IanBenzMaxim 1:e1c7c1c636af 156 if (ds28e15_22_25.writeScratchpad(challenge) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 157 return false;
IanBenzMaxim 1:e1c7c1c636af 158 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 159 if (OWSkipRom(ds2465) != OneWireMaster::Success)
IanBenzMaxim 1:e1c7c1c636af 160 return false;
IanBenzMaxim 1:e1c7c1c636af 161 // Have device compute MAC
IanBenzMaxim 1:e1c7c1c636af 162 DS28E15_22_25::Mac nodeMac;
IanBenzMaxim 1:e1c7c1c636af 163 if (ds28e15_22_25.computeReadPageMac(0, false, nodeMac) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 164 return false;
IanBenzMaxim 1:e1c7c1c636af 165 // Compute expected MAC
IanBenzMaxim 1:e1c7c1c636af 166 DS28E15_22_25::Mac controllerMac;
IanBenzMaxim 6:b6bafd0a7013 167 if (DS28E15_22_25::computeAuthMac(ds2465, pageData, authData.pageNum, challenge, ds28e15_22_25.romId, ds28e15_22_25.manId, controllerMac) != ISha256MacCoproc::Success)
IanBenzMaxim 1:e1c7c1c636af 168 return false;
IanBenzMaxim 1:e1c7c1c636af 169 // Check if authentic
IanBenzMaxim 1:e1c7c1c636af 170 return (nodeMac == controllerMac);
IanBenzMaxim 1:e1c7c1c636af 171 }
IanBenzMaxim 1:e1c7c1c636af 172
IanBenzMaxim 1:e1c7c1c636af 173 bool SensorNode::readSensorData(SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 174 {
IanBenzMaxim 1:e1c7c1c636af 175 bool result;
IanBenzMaxim 1:e1c7c1c636af 176 std::int8_t temp;
IanBenzMaxim 1:e1c7c1c636af 177
IanBenzMaxim 1:e1c7c1c636af 178 // Read temperature sensor
IanBenzMaxim 1:e1c7c1c636af 179 result = (ds7505.read_current_temp(temp) == DS7505::Success);
IanBenzMaxim 1:e1c7c1c636af 180
IanBenzMaxim 1:e1c7c1c636af 181 if (result)
IanBenzMaxim 1:e1c7c1c636af 182 {
IanBenzMaxim 1:e1c7c1c636af 183 sensorData.temp = temp;
IanBenzMaxim 1:e1c7c1c636af 184
IanBenzMaxim 1:e1c7c1c636af 185 // Read light sensor
IanBenzMaxim 1:e1c7c1c636af 186 double currentLux;
IanBenzMaxim 1:e1c7c1c636af 187 result = (max44009.read_current_lux(currentLux) == MAX44009::Success);
IanBenzMaxim 1:e1c7c1c636af 188 if (result)
IanBenzMaxim 1:e1c7c1c636af 189 {
IanBenzMaxim 1:e1c7c1c636af 190 // Convert lux to remaining filter life
IanBenzMaxim 1:e1c7c1c636af 191 sensorData.filterLife = (unsigned int)((currentLux / m_initialLux) * 100);
IanBenzMaxim 1:e1c7c1c636af 192 }
IanBenzMaxim 1:e1c7c1c636af 193 }
IanBenzMaxim 1:e1c7c1c636af 194
IanBenzMaxim 1:e1c7c1c636af 195 return result;
IanBenzMaxim 1:e1c7c1c636af 196 }
IanBenzMaxim 1:e1c7c1c636af 197
IanBenzMaxim 1:e1c7c1c636af 198 bool SensorNode::checkAndWriteAuthData(SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 199 {
IanBenzMaxim 1:e1c7c1c636af 200 bool result = true;
IanBenzMaxim 1:e1c7c1c636af 201
IanBenzMaxim 1:e1c7c1c636af 202 if (sensorData.filterLife > authData.filterLife)
IanBenzMaxim 1:e1c7c1c636af 203 {
IanBenzMaxim 1:e1c7c1c636af 204 sensorData.filterLife = authData.filterLife;
IanBenzMaxim 1:e1c7c1c636af 205 }
IanBenzMaxim 1:e1c7c1c636af 206 else if (sensorData.filterLife < authData.filterLife)
IanBenzMaxim 1:e1c7c1c636af 207 {
IanBenzMaxim 1:e1c7c1c636af 208 AuthData oldAuthData(authData);
IanBenzMaxim 1:e1c7c1c636af 209 authData.filterLife = sensorData.filterLife;
IanBenzMaxim 1:e1c7c1c636af 210 // Select device through Skip ROM
IanBenzMaxim 8:594529956266 211 result = (OWSkipRom(ds2465) == OneWireMaster::Success);
IanBenzMaxim 1:e1c7c1c636af 212 // Write new filter life to DS28E15
IanBenzMaxim 1:e1c7c1c636af 213 if (result)
IanBenzMaxim 1:e1c7c1c636af 214 result = (ds28e15_22_25.writeAuthSegment(ds2465, authData.pageNum, authData.segmentNum, authData.segment, oldAuthData.segment, false) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 215 }
IanBenzMaxim 1:e1c7c1c636af 216
IanBenzMaxim 1:e1c7c1c636af 217 return result;
IanBenzMaxim 1:e1c7c1c636af 218 }
IanBenzMaxim 1:e1c7c1c636af 219
IanBenzMaxim 1:e1c7c1c636af 220 SensorNode::State SensorNode::detect(unsigned int userEntropy)
IanBenzMaxim 1:e1c7c1c636af 221 {
IanBenzMaxim 1:e1c7c1c636af 222 bool provisioned;
IanBenzMaxim 1:e1c7c1c636af 223
IanBenzMaxim 7:e24f0b29f1f7 224 ds2465.OWSetSpeed(DS2465::OverdriveSpeed);
IanBenzMaxim 1:e1c7c1c636af 225
IanBenzMaxim 8:594529956266 226 if (OWReadRom(ds2465, ds28e15_22_25.romId) != OneWireMaster::Success)
IanBenzMaxim 1:e1c7c1c636af 227 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 228
IanBenzMaxim 1:e1c7c1c636af 229 if (!checkProvisioned(provisioned))
IanBenzMaxim 1:e1c7c1c636af 230 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 231
IanBenzMaxim 1:e1c7c1c636af 232 if (!provisioned)
IanBenzMaxim 1:e1c7c1c636af 233 return NotProvisioned;
IanBenzMaxim 1:e1c7c1c636af 234
IanBenzMaxim 1:e1c7c1c636af 235 if (!setSecret())
IanBenzMaxim 1:e1c7c1c636af 236 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 237
IanBenzMaxim 1:e1c7c1c636af 238 if (!checkAuthentic(userEntropy))
IanBenzMaxim 1:e1c7c1c636af 239 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 240
IanBenzMaxim 1:e1c7c1c636af 241 if (!initializeSensors())
IanBenzMaxim 1:e1c7c1c636af 242 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 243
IanBenzMaxim 1:e1c7c1c636af 244 return Authentic;
IanBenzMaxim 1:e1c7c1c636af 245 }
IanBenzMaxim 1:e1c7c1c636af 246
IanBenzMaxim 1:e1c7c1c636af 247 SensorNode::State SensorNode::authenticatedReadSensorData(unsigned int userEntropy, SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 248 {
IanBenzMaxim 7:e24f0b29f1f7 249 ds2465.OWSetSpeed(DS2465::OverdriveSpeed);
IanBenzMaxim 1:e1c7c1c636af 250
IanBenzMaxim 1:e1c7c1c636af 251 if (!setSecret())
IanBenzMaxim 1:e1c7c1c636af 252 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 253
IanBenzMaxim 1:e1c7c1c636af 254 if (!checkAuthentic(userEntropy))
IanBenzMaxim 1:e1c7c1c636af 255 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 256
IanBenzMaxim 1:e1c7c1c636af 257 if (!readSensorData(sensorData))
IanBenzMaxim 1:e1c7c1c636af 258 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 259
IanBenzMaxim 1:e1c7c1c636af 260 if (!checkAndWriteAuthData(sensorData))
IanBenzMaxim 1:e1c7c1c636af 261 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 262
IanBenzMaxim 1:e1c7c1c636af 263 return Authentic;
IanBenzMaxim 1:e1c7c1c636af 264 }