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.

diff -r 6e753e78987c -r 0962f818bf7f SensorNode.cpp
--- a/SensorNode.cpp	Fri May 27 11:47:20 2016 -0500
+++ b/SensorNode.cpp	Mon Jun 06 10:49:15 2016 -0500
@@ -86,7 +86,7 @@
   // Calculate secret
   if (result)
   {
-    result = (DS28E15_22_25::computeNextSecret(ds2465, pageData, authData.pageNum, scratchpad, ds28e15_22_25.romId, ds28e15_22_25.manId) == ISha256MacCoproc::Success);
+    result = (DS28E15_22_25::computeNextSecret(ds2465, pageData, authData.pageNum, scratchpad, ds28e15_22_25.romId(), ds28e15_22_25.manId()) == ISha256MacCoproc::Success);
   }
   return result;
 }
@@ -148,7 +148,7 @@
     return false;
   // Compute expected MAC
   DS28E15_22_25::Mac controllerMac;
-  if (DS28E15_22_25::computeAuthMac(ds2465, pageData, authData.pageNum, challenge, ds28e15_22_25.romId, ds28e15_22_25.manId, controllerMac) != ISha256MacCoproc::Success)
+  if (DS28E15_22_25::computeAuthMac(ds2465, pageData, authData.pageNum, challenge, ds28e15_22_25.romId(), ds28e15_22_25.manId(), controllerMac) != ISha256MacCoproc::Success)
     return false;
   // Check if authentic
   return (nodeMac == controllerMac);
@@ -204,8 +204,10 @@
   
   ds2465.OWSetSpeed(DS2465::OverdriveSpeed);
   
-  if (ds2465.OWReadRom(ds28e15_22_25.romId) != OneWireMaster::Success)
+  RomId romId;
+  if (ds2465.OWReadRom(romId) != OneWireMaster::Success)
     return UnableToCommunicate;
+  ds28e15_22_25.setRomId(romId);
   
   if (!checkProvisioned(provisioned))
     return UnableToCommunicate;