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.
Diff: SensorNode.cpp
- Revision:
- 9:bc3d211d75ce
- Parent:
- 8:594529956266
- Child:
- 11:aeaa77b488c0
diff -r 594529956266 -r bc3d211d75ce SensorNode.cpp --- a/SensorNode.cpp Sat May 14 14:28:31 2016 -0500 +++ b/SensorNode.cpp Mon May 16 10:36:49 2016 -0500 @@ -33,7 +33,6 @@ #include "SensorNode.hpp" #include "common.hpp" -#include "RomCommands.h" #include "Masters/DS2465/DS2465.h" #include "I2C.h" @@ -46,7 +45,6 @@ #endif using namespace OneWire; -using namespace OneWire::RomCommands; bool SensorNode::rngInitialized = false; @@ -62,7 +60,7 @@ } SensorNode::SensorNode(mbed::I2C & i2c, uint8_t ds7505_i2c_addr, uint8_t max44009_i2c_addr, DS2465 & ds2465) - : m_initialLux(1), ds28e15_22_25(ds2465), ds7505(i2c, ds7505_i2c_addr), max44009(i2c, max44009_i2c_addr), ds2465(ds2465) + : m_initialLux(1),ds2465(ds2465), selector(ds2465), ds28e15_22_25(selector), ds7505(i2c, ds7505_i2c_addr), max44009(i2c, max44009_i2c_addr) { if (!rngInitialized) { @@ -98,18 +96,13 @@ DS28E15_22_25::BlockProtection protectionStatus; bool result; - // Select device through Skip ROM - result = (OWSkipRom(ds2465) == OneWireMaster::Success); - if (result) - result = (ds28e15_22_25.readBlockProtection(0, protectionStatus) == OneWireSlave::Success); + + result = (ds28e15_22_25.readBlockProtection(0, protectionStatus) == OneWireSlave::Success); if (result) { if (!protectionStatus.noProtection()) { - // Select device through Skip ROM - result = (OWSkipRom(ds2465) == OneWireMaster::Success); - if (result) - result = (ds28e15_22_25.readSegment(authData.pageNum, authData.segmentNum, authData.segment) == OneWireSlave::Success); + result = (ds28e15_22_25.readSegment(authData.pageNum, authData.segmentNum, authData.segment) == OneWireSlave::Success); if (result) provisioned = true; } @@ -126,9 +119,6 @@ DS28E15_22_25::Scratchpad challenge; DS28E15_22_25::Page pageData; - // Select device through Skip ROM - if (OWSkipRom(ds2465) != OneWireMaster::Success) - return false; // Read page data if (ds28e15_22_25.readPage(authData.pageNum, pageData, false) != OneWireSlave::Success) return false; @@ -149,15 +139,9 @@ #endif } - // Select device through Skip ROM - if (OWSkipRom(ds2465) != OneWireMaster::Success) - return false; // Write challenge to scratchpad if (ds28e15_22_25.writeScratchpad(challenge) != OneWireSlave::Success) return false; - // Select device through Skip ROM - if (OWSkipRom(ds2465) != OneWireMaster::Success) - return false; // Have device compute MAC DS28E15_22_25::Mac nodeMac; if (ds28e15_22_25.computeReadPageMac(0, false, nodeMac) != OneWireSlave::Success) @@ -207,11 +191,8 @@ { AuthData oldAuthData(authData); authData.filterLife = sensorData.filterLife; - // Select device through Skip ROM - result = (OWSkipRom(ds2465) == OneWireMaster::Success); // Write new filter life to DS28E15 - if (result) - result = (ds28e15_22_25.writeAuthSegment(ds2465, authData.pageNum, authData.segmentNum, authData.segment, oldAuthData.segment, false) == OneWireSlave::Success); + result = (ds28e15_22_25.writeAuthSegment(ds2465, authData.pageNum, authData.segmentNum, authData.segment, oldAuthData.segment, false) == OneWireSlave::Success); } return result; @@ -223,7 +204,7 @@ ds2465.OWSetSpeed(DS2465::OverdriveSpeed); - if (OWReadRom(ds2465, ds28e15_22_25.romId) != OneWireMaster::Success) + if (ds2465.OWReadRom(ds28e15_22_25.romId) != OneWireMaster::Success) return UnableToCommunicate; if (!checkProvisioned(provisioned))