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@25:37ea43ff81be, 2016-12-16 (annotated)

Committer:
IanBenzMaxim
Date:
Fri Dec 16 10:47:34 2016 -0600
Revision:
25:37ea43ff81be
Parent:
20:cdba71cb5506
Child:
30:0784010d6975
Now using unique secret for data signing between mbed node and server. Updated to mbed 5 for better platform support. Updated to latest version of 1-Wire 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 25:37ea43ff81be 35 #include "SensorData.hpp"
IanBenzMaxim 6:b6bafd0a7013 36 #include "Masters/DS2465/DS2465.h"
IanBenzMaxim 17:41be4896ed6d 37 #include "RomId/RomCommands.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 17:41be4896ed6d 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 18:6fbf7e7b6ab6 65 : m_initialLux(1),ds2465(ds2465), selector(ds2465), ds28e15(selector), ds7505(i2c, ds7505_i2c_addr), max44009(i2c, max44009_i2c_addr)
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 25:37ea43ff81be 85 scratchpad.fill(uint8_t(defaultPaddingByte));
IanBenzMaxim 1:e1c7c1c636af 86 // Read page data
IanBenzMaxim 25:37ea43ff81be 87 bool result = (ds2465.readMemory(DS2465::UserMemoryPage0, pageData.data(), pageData.size(), false) == OneWireMaster::Success);
IanBenzMaxim 1:e1c7c1c636af 88 // Calculate secret
IanBenzMaxim 1:e1c7c1c636af 89 if (result)
IanBenzMaxim 1:e1c7c1c636af 90 {
IanBenzMaxim 18:6fbf7e7b6ab6 91 result = (DS28E15_22_25::computeNextSecret(ds2465, pageData, authData.pageNum, scratchpad, ds28e15.romId(), ds28e15.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 9:bc3d211d75ce 101
IanBenzMaxim 18:6fbf7e7b6ab6 102 result = (ds28e15.readBlockProtection(0, protectionStatus) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 103 if (result)
IanBenzMaxim 1:e1c7c1c636af 104 {
IanBenzMaxim 1:e1c7c1c636af 105 if (!protectionStatus.noProtection())
IanBenzMaxim 1:e1c7c1c636af 106 {
IanBenzMaxim 18:6fbf7e7b6ab6 107 result = (ds28e15.readSegment(authData.pageNum, authData.segmentNum, authData.segment) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 108 if (result)
IanBenzMaxim 1:e1c7c1c636af 109 provisioned = true;
IanBenzMaxim 1:e1c7c1c636af 110 }
IanBenzMaxim 1:e1c7c1c636af 111 else
IanBenzMaxim 1:e1c7c1c636af 112 {
IanBenzMaxim 1:e1c7c1c636af 113 provisioned = false;
IanBenzMaxim 1:e1c7c1c636af 114 }
IanBenzMaxim 1:e1c7c1c636af 115 }
IanBenzMaxim 1:e1c7c1c636af 116 return result;
IanBenzMaxim 1:e1c7c1c636af 117 }
IanBenzMaxim 1:e1c7c1c636af 118
IanBenzMaxim 1:e1c7c1c636af 119 bool SensorNode::checkAuthentic(unsigned int userEntropy)
IanBenzMaxim 1:e1c7c1c636af 120 {
IanBenzMaxim 1:e1c7c1c636af 121 DS28E15_22_25::Scratchpad challenge;
IanBenzMaxim 1:e1c7c1c636af 122 DS28E15_22_25::Page pageData;
IanBenzMaxim 1:e1c7c1c636af 123
IanBenzMaxim 1:e1c7c1c636af 124 // Read page data
IanBenzMaxim 18:6fbf7e7b6ab6 125 if (ds28e15.readPage(authData.pageNum, pageData, false) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 126 return false;
IanBenzMaxim 1:e1c7c1c636af 127
IanBenzMaxim 1:e1c7c1c636af 128 // Create random challenge
IanBenzMaxim 1:e1c7c1c636af 129 // Use hardare RNG on MAX32600
IanBenzMaxim 1:e1c7c1c636af 130 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 131 MXC_TPU->prng_user_entropy = userEntropy;
IanBenzMaxim 1:e1c7c1c636af 132 #else
IanBenzMaxim 1:e1c7c1c636af 133 std::srand(userEntropy);
IanBenzMaxim 1:e1c7c1c636af 134 #endif
IanBenzMaxim 25:37ea43ff81be 135 for (size_t i = 0; i < challenge.size(); i++)
IanBenzMaxim 1:e1c7c1c636af 136 {
IanBenzMaxim 1:e1c7c1c636af 137 #ifdef TARGET_MAX32600
IanBenzMaxim 1:e1c7c1c636af 138 challenge[i] = MXC_TPU->prng_rnd_num;
IanBenzMaxim 1:e1c7c1c636af 139 #else
IanBenzMaxim 1:e1c7c1c636af 140 challenge[i] = std::rand();
IanBenzMaxim 1:e1c7c1c636af 141 #endif
IanBenzMaxim 1:e1c7c1c636af 142 }
IanBenzMaxim 1:e1c7c1c636af 143
IanBenzMaxim 1:e1c7c1c636af 144 // Write challenge to scratchpad
IanBenzMaxim 18:6fbf7e7b6ab6 145 if (ds28e15.writeScratchpad(challenge) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 146 return false;
IanBenzMaxim 1:e1c7c1c636af 147 // Have device compute MAC
IanBenzMaxim 1:e1c7c1c636af 148 DS28E15_22_25::Mac nodeMac;
IanBenzMaxim 18:6fbf7e7b6ab6 149 if (ds28e15.computeReadPageMac(0, false, nodeMac) != OneWireSlave::Success)
IanBenzMaxim 1:e1c7c1c636af 150 return false;
IanBenzMaxim 1:e1c7c1c636af 151 // Compute expected MAC
IanBenzMaxim 1:e1c7c1c636af 152 DS28E15_22_25::Mac controllerMac;
IanBenzMaxim 18:6fbf7e7b6ab6 153 if (DS28E15_22_25::computeAuthMac(ds2465, pageData, authData.pageNum, challenge, ds28e15.romId(), ds28e15.manId(), controllerMac) != ISha256MacCoproc::Success)
IanBenzMaxim 1:e1c7c1c636af 154 return false;
IanBenzMaxim 1:e1c7c1c636af 155 // Check if authentic
IanBenzMaxim 1:e1c7c1c636af 156 return (nodeMac == controllerMac);
IanBenzMaxim 1:e1c7c1c636af 157 }
IanBenzMaxim 1:e1c7c1c636af 158
IanBenzMaxim 1:e1c7c1c636af 159 bool SensorNode::readSensorData(SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 160 {
IanBenzMaxim 1:e1c7c1c636af 161 bool result;
IanBenzMaxim 20:cdba71cb5506 162 int8_t temp;
IanBenzMaxim 1:e1c7c1c636af 163
IanBenzMaxim 1:e1c7c1c636af 164 // Read temperature sensor
IanBenzMaxim 1:e1c7c1c636af 165 result = (ds7505.read_current_temp(temp) == DS7505::Success);
IanBenzMaxim 1:e1c7c1c636af 166
IanBenzMaxim 1:e1c7c1c636af 167 if (result)
IanBenzMaxim 1:e1c7c1c636af 168 {
IanBenzMaxim 1:e1c7c1c636af 169 sensorData.temp = temp;
IanBenzMaxim 1:e1c7c1c636af 170
IanBenzMaxim 1:e1c7c1c636af 171 // Read light sensor
IanBenzMaxim 1:e1c7c1c636af 172 double currentLux;
IanBenzMaxim 1:e1c7c1c636af 173 result = (max44009.read_current_lux(currentLux) == MAX44009::Success);
IanBenzMaxim 1:e1c7c1c636af 174 if (result)
IanBenzMaxim 1:e1c7c1c636af 175 {
IanBenzMaxim 1:e1c7c1c636af 176 // Convert lux to remaining filter life
IanBenzMaxim 1:e1c7c1c636af 177 sensorData.filterLife = (unsigned int)((currentLux / m_initialLux) * 100);
IanBenzMaxim 1:e1c7c1c636af 178 }
IanBenzMaxim 1:e1c7c1c636af 179 }
IanBenzMaxim 1:e1c7c1c636af 180
IanBenzMaxim 1:e1c7c1c636af 181 return result;
IanBenzMaxim 1:e1c7c1c636af 182 }
IanBenzMaxim 1:e1c7c1c636af 183
IanBenzMaxim 1:e1c7c1c636af 184 bool SensorNode::checkAndWriteAuthData(SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 185 {
IanBenzMaxim 1:e1c7c1c636af 186 bool result = true;
IanBenzMaxim 1:e1c7c1c636af 187
IanBenzMaxim 1:e1c7c1c636af 188 if (sensorData.filterLife > authData.filterLife)
IanBenzMaxim 1:e1c7c1c636af 189 {
IanBenzMaxim 1:e1c7c1c636af 190 sensorData.filterLife = authData.filterLife;
IanBenzMaxim 1:e1c7c1c636af 191 }
IanBenzMaxim 1:e1c7c1c636af 192 else if (sensorData.filterLife < authData.filterLife)
IanBenzMaxim 1:e1c7c1c636af 193 {
IanBenzMaxim 1:e1c7c1c636af 194 AuthData oldAuthData(authData);
IanBenzMaxim 1:e1c7c1c636af 195 authData.filterLife = sensorData.filterLife;
IanBenzMaxim 1:e1c7c1c636af 196 // Write new filter life to DS28E15
IanBenzMaxim 18:6fbf7e7b6ab6 197 result = (ds28e15.writeAuthSegment(ds2465, authData.pageNum, authData.segmentNum, authData.segment, oldAuthData.segment, false) == OneWireSlave::Success);
IanBenzMaxim 1:e1c7c1c636af 198 }
IanBenzMaxim 1:e1c7c1c636af 199
IanBenzMaxim 1:e1c7c1c636af 200 return result;
IanBenzMaxim 1:e1c7c1c636af 201 }
IanBenzMaxim 1:e1c7c1c636af 202
IanBenzMaxim 1:e1c7c1c636af 203 SensorNode::State SensorNode::detect(unsigned int userEntropy)
IanBenzMaxim 1:e1c7c1c636af 204 {
IanBenzMaxim 1:e1c7c1c636af 205 bool provisioned;
IanBenzMaxim 1:e1c7c1c636af 206
IanBenzMaxim 7:e24f0b29f1f7 207 ds2465.OWSetSpeed(DS2465::OverdriveSpeed);
IanBenzMaxim 1:e1c7c1c636af 208
IanBenzMaxim 14:0962f818bf7f 209 RomId romId;
IanBenzMaxim 17:41be4896ed6d 210 if (OWReadRom(ds2465, romId) != OneWireMaster::Success)
IanBenzMaxim 1:e1c7c1c636af 211 return UnableToCommunicate;
IanBenzMaxim 18:6fbf7e7b6ab6 212 ds28e15.setRomId(romId);
IanBenzMaxim 1:e1c7c1c636af 213
IanBenzMaxim 1:e1c7c1c636af 214 if (!checkProvisioned(provisioned))
IanBenzMaxim 1:e1c7c1c636af 215 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 216
IanBenzMaxim 1:e1c7c1c636af 217 if (!provisioned)
IanBenzMaxim 1:e1c7c1c636af 218 return NotProvisioned;
IanBenzMaxim 1:e1c7c1c636af 219
IanBenzMaxim 1:e1c7c1c636af 220 if (!setSecret())
IanBenzMaxim 1:e1c7c1c636af 221 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 222
IanBenzMaxim 1:e1c7c1c636af 223 if (!checkAuthentic(userEntropy))
IanBenzMaxim 1:e1c7c1c636af 224 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 225
IanBenzMaxim 1:e1c7c1c636af 226 if (!initializeSensors())
IanBenzMaxim 1:e1c7c1c636af 227 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 228
IanBenzMaxim 1:e1c7c1c636af 229 return Authentic;
IanBenzMaxim 1:e1c7c1c636af 230 }
IanBenzMaxim 1:e1c7c1c636af 231
IanBenzMaxim 1:e1c7c1c636af 232 SensorNode::State SensorNode::authenticatedReadSensorData(unsigned int userEntropy, SensorData & sensorData)
IanBenzMaxim 1:e1c7c1c636af 233 {
IanBenzMaxim 7:e24f0b29f1f7 234 ds2465.OWSetSpeed(DS2465::OverdriveSpeed);
IanBenzMaxim 1:e1c7c1c636af 235
IanBenzMaxim 1:e1c7c1c636af 236 if (!setSecret())
IanBenzMaxim 1:e1c7c1c636af 237 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 238
IanBenzMaxim 1:e1c7c1c636af 239 if (!checkAuthentic(userEntropy))
IanBenzMaxim 1:e1c7c1c636af 240 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 241
IanBenzMaxim 1:e1c7c1c636af 242 if (!readSensorData(sensorData))
IanBenzMaxim 1:e1c7c1c636af 243 return UnableToCommunicate;
IanBenzMaxim 1:e1c7c1c636af 244
IanBenzMaxim 1:e1c7c1c636af 245 if (!checkAndWriteAuthData(sensorData))
IanBenzMaxim 1:e1c7c1c636af 246 return NotAuthentic;
IanBenzMaxim 1:e1c7c1c636af 247
IanBenzMaxim 1:e1c7c1c636af 248 return Authentic;
IanBenzMaxim 1:e1c7c1c636af 249 }