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@32:0a09505a656d, 2017-11-06 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Mon Nov 06 17:34:13 2017 -0600
- Revision:
- 32:0a09505a656d
- Parent:
- 30:0784010d6975
Updated to use MaximInterface library.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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 | 32:0a09505a656d | 33 | #include <I2C.h> |
IanBenzMaxim | 32:0a09505a656d | 34 | #include <MaximInterface/Devices/DS2465.hpp> |
IanBenzMaxim | 32:0a09505a656d | 35 | #include <MaximInterface/Links/RomCommands.hpp> |
IanBenzMaxim | 32:0a09505a656d | 36 | #include <MaximInterface/Platforms/mbed/Sleep.hpp> |
IanBenzMaxim | 1:e1c7c1c636af | 37 | #include "SensorNode.hpp" |
IanBenzMaxim | 25:37ea43ff81be | 38 | #include "SensorData.hpp" |
IanBenzMaxim | 1:e1c7c1c636af | 39 | |
IanBenzMaxim | 1:e1c7c1c636af | 40 | #ifdef TARGET_MAX32600 |
IanBenzMaxim | 32:0a09505a656d | 41 | #include <max32600.h> |
IanBenzMaxim | 32:0a09505a656d | 42 | #include <clkman_regs.h> |
IanBenzMaxim | 32:0a09505a656d | 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 | 32:0a09505a656d | 48 | using namespace MaximInterface; |
IanBenzMaxim | 6:b6bafd0a7013 | 49 | |
IanBenzMaxim | 32:0a09505a656d | 50 | const ManId SensorNode::manId = {0, 0}; |
IanBenzMaxim | 1:e1c7c1c636af | 51 | bool SensorNode::rngInitialized = false; |
IanBenzMaxim | 1:e1c7c1c636af | 52 | |
IanBenzMaxim | 32:0a09505a656d | 53 | void SensorNode::initializeRng() { |
IanBenzMaxim | 1:e1c7c1c636af | 54 | #ifdef TARGET_MAX32600 |
IanBenzMaxim | 32:0a09505a656d | 55 | // Enable crypto oscillator |
IanBenzMaxim | 32:0a09505a656d | 56 | MXC_CLKMAN->clk_config |= (MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_ENABLE | |
IanBenzMaxim | 32:0a09505a656d | 57 | MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_RESET_N); |
IanBenzMaxim | 32:0a09505a656d | 58 | // Wait for crypto oscillator stability |
IanBenzMaxim | 32:0a09505a656d | 59 | while ((MXC_CLKMAN->intfl & MXC_F_CLKMAN_INTFL_CRYPTO_STABLE) != |
IanBenzMaxim | 32:0a09505a656d | 60 | MXC_F_CLKMAN_INTFL_CRYPTO_STABLE); |
IanBenzMaxim | 32:0a09505a656d | 61 | // Disable crypto clock gating |
IanBenzMaxim | 32:0a09505a656d | 62 | MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_CRYPTO_GATE_N; |
IanBenzMaxim | 32:0a09505a656d | 63 | // Set PRNG clock to crypto clock |
IanBenzMaxim | 32:0a09505a656d | 64 | MXC_CLKMAN->crypt_clk_ctrl_2_prng = MXC_CLKMAN->clk_ctrl_10_prng = 1; |
IanBenzMaxim | 32:0a09505a656d | 65 | // Use dynamic clock gating |
IanBenzMaxim | 32:0a09505a656d | 66 | MXC_CLKMAN->clk_gate_ctrl2 |= |
IanBenzMaxim | 32:0a09505a656d | 67 | (1 << MXC_F_CLKMAN_CLK_GATE_CTRL2_TPU_CLK_GATER_POS); |
IanBenzMaxim | 1:e1c7c1c636af | 68 | #endif |
IanBenzMaxim | 1:e1c7c1c636af | 69 | } |
IanBenzMaxim | 1:e1c7c1c636af | 70 | |
IanBenzMaxim | 32:0a09505a656d | 71 | SensorNode::SensorNode(::mbed::I2C & i2c, uint8_t ds7505_i2c_addr, |
IanBenzMaxim | 32:0a09505a656d | 72 | uint8_t max44009_i2c_addr, DS2465 & ds2465) |
IanBenzMaxim | 32:0a09505a656d | 73 | : initialLux_(1), ds2465(ds2465), |
IanBenzMaxim | 32:0a09505a656d | 74 | ds28e15(MaximInterface::mbed::Sleep::instance(), ds2465, &skipRom), |
IanBenzMaxim | 32:0a09505a656d | 75 | ds7505(i2c, ds7505_i2c_addr), max44009(i2c, max44009_i2c_addr) { |
IanBenzMaxim | 32:0a09505a656d | 76 | if (!rngInitialized) { |
IanBenzMaxim | 1:e1c7c1c636af | 77 | initializeRng(); |
IanBenzMaxim | 1:e1c7c1c636af | 78 | rngInitialized = true; |
IanBenzMaxim | 1:e1c7c1c636af | 79 | } |
IanBenzMaxim | 1:e1c7c1c636af | 80 | } |
IanBenzMaxim | 1:e1c7c1c636af | 81 | |
IanBenzMaxim | 32:0a09505a656d | 82 | bool SensorNode::initializeSensors() { |
IanBenzMaxim | 32:0a09505a656d | 83 | return (max44009.read_current_lux(initialLux_) == MAX44009::Success); |
IanBenzMaxim | 1:e1c7c1c636af | 84 | } |
IanBenzMaxim | 1:e1c7c1c636af | 85 | |
IanBenzMaxim | 32:0a09505a656d | 86 | bool SensorNode::setSecret() { |
IanBenzMaxim | 1:e1c7c1c636af | 87 | // Create constant partial secret |
IanBenzMaxim | 32:0a09505a656d | 88 | DS28E15::Scratchpad scratchpad; |
IanBenzMaxim | 25:37ea43ff81be | 89 | scratchpad.fill(uint8_t(defaultPaddingByte)); |
IanBenzMaxim | 1:e1c7c1c636af | 90 | // Calculate secret |
IanBenzMaxim | 32:0a09505a656d | 91 | const Sha256::SlaveSecretData data = DS28E15::createSlaveSecretData( |
IanBenzMaxim | 32:0a09505a656d | 92 | DS28E15::Page(), authData.pageNum, scratchpad, romId_, manId); |
IanBenzMaxim | 32:0a09505a656d | 93 | return !ds2465.computeSlaveSecretWithSwap(data, 0, DS2465::FullPage); |
IanBenzMaxim | 1:e1c7c1c636af | 94 | } |
IanBenzMaxim | 1:e1c7c1c636af | 95 | |
IanBenzMaxim | 32:0a09505a656d | 96 | bool SensorNode::checkProvisioned(bool & provisioned) { |
IanBenzMaxim | 32:0a09505a656d | 97 | DS28E15::BlockProtection protectionStatus; |
IanBenzMaxim | 1:e1c7c1c636af | 98 | bool result; |
IanBenzMaxim | 32:0a09505a656d | 99 | |
IanBenzMaxim | 32:0a09505a656d | 100 | result = !ds28e15.readBlockProtection(0, protectionStatus); |
IanBenzMaxim | 32:0a09505a656d | 101 | if (result) { |
IanBenzMaxim | 32:0a09505a656d | 102 | if (!protectionStatus.noProtection()) { |
IanBenzMaxim | 32:0a09505a656d | 103 | result = !ds28e15.readSegment(authData.pageNum, authData.segmentNum, |
IanBenzMaxim | 32:0a09505a656d | 104 | authData.segment); |
IanBenzMaxim | 1:e1c7c1c636af | 105 | if (result) |
IanBenzMaxim | 1:e1c7c1c636af | 106 | provisioned = true; |
IanBenzMaxim | 32:0a09505a656d | 107 | } else { |
IanBenzMaxim | 1:e1c7c1c636af | 108 | provisioned = false; |
IanBenzMaxim | 1:e1c7c1c636af | 109 | } |
IanBenzMaxim | 1:e1c7c1c636af | 110 | } |
IanBenzMaxim | 1:e1c7c1c636af | 111 | return result; |
IanBenzMaxim | 1:e1c7c1c636af | 112 | } |
IanBenzMaxim | 1:e1c7c1c636af | 113 | |
IanBenzMaxim | 32:0a09505a656d | 114 | bool SensorNode::checkAuthentic(unsigned int userEntropy) { |
IanBenzMaxim | 32:0a09505a656d | 115 | DS28E15::Scratchpad challenge; |
IanBenzMaxim | 32:0a09505a656d | 116 | DS28E15::Page pageData; |
IanBenzMaxim | 32:0a09505a656d | 117 | |
IanBenzMaxim | 1:e1c7c1c636af | 118 | // Read page data |
IanBenzMaxim | 32:0a09505a656d | 119 | if (ds28e15.readPage(authData.pageNum, pageData)) |
IanBenzMaxim | 1:e1c7c1c636af | 120 | return false; |
IanBenzMaxim | 32:0a09505a656d | 121 | |
IanBenzMaxim | 1:e1c7c1c636af | 122 | // Create random challenge |
IanBenzMaxim | 1:e1c7c1c636af | 123 | // Use hardare RNG on MAX32600 |
IanBenzMaxim | 32:0a09505a656d | 124 | #ifdef TARGET_MAX32600 |
IanBenzMaxim | 1:e1c7c1c636af | 125 | MXC_TPU->prng_user_entropy = userEntropy; |
IanBenzMaxim | 1:e1c7c1c636af | 126 | #else |
IanBenzMaxim | 1:e1c7c1c636af | 127 | std::srand(userEntropy); |
IanBenzMaxim | 1:e1c7c1c636af | 128 | #endif |
IanBenzMaxim | 32:0a09505a656d | 129 | for (size_t i = 0; i < challenge.size(); i++) { |
IanBenzMaxim | 1:e1c7c1c636af | 130 | #ifdef TARGET_MAX32600 |
IanBenzMaxim | 1:e1c7c1c636af | 131 | challenge[i] = MXC_TPU->prng_rnd_num; |
IanBenzMaxim | 1:e1c7c1c636af | 132 | #else |
IanBenzMaxim | 32:0a09505a656d | 133 | challenge[i] = std::rand(); |
IanBenzMaxim | 1:e1c7c1c636af | 134 | #endif |
IanBenzMaxim | 1:e1c7c1c636af | 135 | } |
IanBenzMaxim | 1:e1c7c1c636af | 136 | |
IanBenzMaxim | 1:e1c7c1c636af | 137 | // Write challenge to scratchpad |
IanBenzMaxim | 32:0a09505a656d | 138 | if (ds28e15.writeScratchpad(challenge)) |
IanBenzMaxim | 1:e1c7c1c636af | 139 | return false; |
IanBenzMaxim | 1:e1c7c1c636af | 140 | // Have device compute MAC |
IanBenzMaxim | 32:0a09505a656d | 141 | Sha256::Hash nodeMac; |
IanBenzMaxim | 32:0a09505a656d | 142 | if (ds28e15.computeReadPageMac(0, false, nodeMac)) |
IanBenzMaxim | 1:e1c7c1c636af | 143 | return false; |
IanBenzMaxim | 1:e1c7c1c636af | 144 | // Compute expected MAC |
IanBenzMaxim | 32:0a09505a656d | 145 | const Sha256::AuthMacData controllerMacData = DS28E15::createAuthMacData( |
IanBenzMaxim | 32:0a09505a656d | 146 | pageData, authData.pageNum, challenge, romId_, manId); |
IanBenzMaxim | 32:0a09505a656d | 147 | Sha256::Hash controllerMac; |
IanBenzMaxim | 32:0a09505a656d | 148 | if (ds2465.computeAuthMac(controllerMacData, controllerMac)) |
IanBenzMaxim | 1:e1c7c1c636af | 149 | return false; |
IanBenzMaxim | 1:e1c7c1c636af | 150 | // Check if authentic |
IanBenzMaxim | 1:e1c7c1c636af | 151 | return (nodeMac == controllerMac); |
IanBenzMaxim | 1:e1c7c1c636af | 152 | } |
IanBenzMaxim | 1:e1c7c1c636af | 153 | |
IanBenzMaxim | 32:0a09505a656d | 154 | bool SensorNode::readSensorData(SensorData & sensorData) { |
IanBenzMaxim | 1:e1c7c1c636af | 155 | bool result; |
IanBenzMaxim | 20:cdba71cb5506 | 156 | int8_t temp; |
IanBenzMaxim | 32:0a09505a656d | 157 | |
IanBenzMaxim | 1:e1c7c1c636af | 158 | // Read temperature sensor |
IanBenzMaxim | 1:e1c7c1c636af | 159 | result = (ds7505.read_current_temp(temp) == DS7505::Success); |
IanBenzMaxim | 32:0a09505a656d | 160 | |
IanBenzMaxim | 32:0a09505a656d | 161 | if (result) { |
IanBenzMaxim | 1:e1c7c1c636af | 162 | sensorData.temp = temp; |
IanBenzMaxim | 32:0a09505a656d | 163 | |
IanBenzMaxim | 1:e1c7c1c636af | 164 | // Read light sensor |
IanBenzMaxim | 1:e1c7c1c636af | 165 | double currentLux; |
IanBenzMaxim | 1:e1c7c1c636af | 166 | result = (max44009.read_current_lux(currentLux) == MAX44009::Success); |
IanBenzMaxim | 32:0a09505a656d | 167 | if (result) { |
IanBenzMaxim | 1:e1c7c1c636af | 168 | // Convert lux to remaining filter life |
IanBenzMaxim | 32:0a09505a656d | 169 | sensorData.filterLife = |
IanBenzMaxim | 32:0a09505a656d | 170 | static_cast<uint8_t>((currentLux / initialLux_) * 100); |
IanBenzMaxim | 1:e1c7c1c636af | 171 | } |
IanBenzMaxim | 1:e1c7c1c636af | 172 | } |
IanBenzMaxim | 32:0a09505a656d | 173 | |
IanBenzMaxim | 1:e1c7c1c636af | 174 | return result; |
IanBenzMaxim | 1:e1c7c1c636af | 175 | } |
IanBenzMaxim | 1:e1c7c1c636af | 176 | |
IanBenzMaxim | 32:0a09505a656d | 177 | bool SensorNode::checkAndWriteAuthData(SensorData & sensorData) { |
IanBenzMaxim | 1:e1c7c1c636af | 178 | bool result = true; |
IanBenzMaxim | 32:0a09505a656d | 179 | |
IanBenzMaxim | 32:0a09505a656d | 180 | if (sensorData.filterLife > authData.filterLife()) { |
IanBenzMaxim | 32:0a09505a656d | 181 | sensorData.filterLife = authData.filterLife(); |
IanBenzMaxim | 32:0a09505a656d | 182 | } else if (sensorData.filterLife < authData.filterLife()) { |
IanBenzMaxim | 32:0a09505a656d | 183 | AuthData newAuthData = authData; |
IanBenzMaxim | 32:0a09505a656d | 184 | newAuthData.filterLife() = sensorData.filterLife; |
IanBenzMaxim | 32:0a09505a656d | 185 | const Sha256::WriteMacData macData = DS28E15::createSegmentWriteMacData( |
IanBenzMaxim | 32:0a09505a656d | 186 | authData.pageNum, authData.segmentNum, newAuthData.segment, |
IanBenzMaxim | 32:0a09505a656d | 187 | authData.segment, romId_, manId); |
IanBenzMaxim | 32:0a09505a656d | 188 | Sha256::Hash mac; |
IanBenzMaxim | 32:0a09505a656d | 189 | result = !ds2465.computeWriteMac(macData, mac); |
IanBenzMaxim | 32:0a09505a656d | 190 | if (result) |
IanBenzMaxim | 32:0a09505a656d | 191 | result = !ds28e15.writeAuthSegment(authData.pageNum, authData.segmentNum, |
IanBenzMaxim | 32:0a09505a656d | 192 | newAuthData.segment, mac); |
IanBenzMaxim | 32:0a09505a656d | 193 | if (result) |
IanBenzMaxim | 32:0a09505a656d | 194 | authData = newAuthData; |
IanBenzMaxim | 1:e1c7c1c636af | 195 | } |
IanBenzMaxim | 32:0a09505a656d | 196 | |
IanBenzMaxim | 1:e1c7c1c636af | 197 | return result; |
IanBenzMaxim | 1:e1c7c1c636af | 198 | } |
IanBenzMaxim | 1:e1c7c1c636af | 199 | |
IanBenzMaxim | 32:0a09505a656d | 200 | SensorNode::State SensorNode::detect(unsigned int userEntropy) { |
IanBenzMaxim | 1:e1c7c1c636af | 201 | bool provisioned; |
IanBenzMaxim | 32:0a09505a656d | 202 | |
IanBenzMaxim | 32:0a09505a656d | 203 | ds2465.setSpeed(DS2465::OverdriveSpeed); |
IanBenzMaxim | 32:0a09505a656d | 204 | |
IanBenzMaxim | 32:0a09505a656d | 205 | if (readRom(ds2465, romId_)) |
IanBenzMaxim | 1:e1c7c1c636af | 206 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 207 | |
IanBenzMaxim | 1:e1c7c1c636af | 208 | if (!checkProvisioned(provisioned)) |
IanBenzMaxim | 1:e1c7c1c636af | 209 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 210 | |
IanBenzMaxim | 1:e1c7c1c636af | 211 | if (!provisioned) |
IanBenzMaxim | 32:0a09505a656d | 212 | return NotProvisioned; |
IanBenzMaxim | 32:0a09505a656d | 213 | |
IanBenzMaxim | 1:e1c7c1c636af | 214 | if (!setSecret()) |
IanBenzMaxim | 1:e1c7c1c636af | 215 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 216 | |
IanBenzMaxim | 1:e1c7c1c636af | 217 | if (!checkAuthentic(userEntropy)) |
IanBenzMaxim | 1:e1c7c1c636af | 218 | return NotAuthentic; |
IanBenzMaxim | 32:0a09505a656d | 219 | |
IanBenzMaxim | 1:e1c7c1c636af | 220 | if (!initializeSensors()) |
IanBenzMaxim | 1:e1c7c1c636af | 221 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 222 | |
IanBenzMaxim | 1:e1c7c1c636af | 223 | return Authentic; |
IanBenzMaxim | 1:e1c7c1c636af | 224 | } |
IanBenzMaxim | 1:e1c7c1c636af | 225 | |
IanBenzMaxim | 32:0a09505a656d | 226 | SensorNode::State |
IanBenzMaxim | 32:0a09505a656d | 227 | SensorNode::authenticatedReadSensorData(unsigned int userEntropy, |
IanBenzMaxim | 32:0a09505a656d | 228 | SensorData & sensorData) { |
IanBenzMaxim | 32:0a09505a656d | 229 | ds2465.setSpeed(DS2465::OverdriveSpeed); |
IanBenzMaxim | 32:0a09505a656d | 230 | |
IanBenzMaxim | 1:e1c7c1c636af | 231 | if (!setSecret()) |
IanBenzMaxim | 1:e1c7c1c636af | 232 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 233 | |
IanBenzMaxim | 1:e1c7c1c636af | 234 | if (!checkAuthentic(userEntropy)) |
IanBenzMaxim | 1:e1c7c1c636af | 235 | return NotAuthentic; |
IanBenzMaxim | 32:0a09505a656d | 236 | |
IanBenzMaxim | 1:e1c7c1c636af | 237 | if (!readSensorData(sensorData)) |
IanBenzMaxim | 1:e1c7c1c636af | 238 | return UnableToCommunicate; |
IanBenzMaxim | 32:0a09505a656d | 239 | |
IanBenzMaxim | 1:e1c7c1c636af | 240 | if (!checkAndWriteAuthData(sensorData)) |
IanBenzMaxim | 1:e1c7c1c636af | 241 | return NotAuthentic; |
IanBenzMaxim | 32:0a09505a656d | 242 | |
IanBenzMaxim | 1:e1c7c1c636af | 243 | return Authentic; |
IanBenzMaxim | 1:e1c7c1c636af | 244 | } |