Method and apparatus for secure multi-cycle vehicle software updates
A system includes a processor controlling a vehicle module (VM) in communication with a telematics control unit (TCU) over a bus. In this embodiment, the processor is configured to receive an authentication request, including a counter value, from the TCU. The processor is also configured to respond to the authentication request based on comparison of the counter value to a stored counter value stored by the VM. The processor is further configured to receive a command corresponding to the authentication request and including the counter value, responsive to the approved authentication request and process the command based on comparison of the counter value to the stored counter value.
1. A system comprising:
a vehicle module including at least an updateable memory and storing a verification counter value usable for authentication of memory-state change commands based on an authentication counter value received from outside the module;
a vehicle-processor configured to:
send an authentication request, including the authentication counter value, to a module for a module memory-state change command;
send a memory-state change command responsive to receiving authentication, based on the sent authentication counter value, from the module;
repeat sending the authentication request and memory-state change command over multiple vehicle key cycles until the module completes the memory-state change command;
responsive to completion of the memory-state change command, receiving an updated verification counter value from the module; and
updating the authentication counter value to match the updated verification counter value.
2. The system of claim 1 , wherein the processor is configured to receive an update instruction comprising multiple memory-state change commands, from a remote system.
3. The system of claim 2 , wherein the update instruction includes the authentication counter value.
4. The system of claim 2 , wherein the processor is configured to send the updated authentication counter value to the remote system.
5. The system of claim 1 , wherein the module is configured to respond affirmatively to the authentication request based on the authentication counter value received with the authentication request not being less than a stored counter value of the verification counter stored by the module.
6. The system of claim 5 , wherein the module is configured to update the stored verification counter value upon completion of the memory-state change command.
7. The system of claim 6 , wherein the module is configured to send the updated stored verification counter value responsive to completion of the memory-state change command.
8. The system of claim 1 , wherein the memory-state change command includes a write command.
9. The system of claim 1 , wherein the memory-state change command includes an erase command.