Target Board Firmware - SimpleSerial on untackled target boards

Embedded Security ChipWhisperer Hardware
1

Hi everyone,

I’m sorry if you consider this post trivial, I’m a newbie in this field. I’m trying to attack a firmware AES implementation on PIC16F18XXX MCU.

I initialized the system with firmware that sets up:

  • UART module, both in Tx and Rx, for the target board to communicate with the capture board via SimpleSerial protocol;
  • GPIO pins, in order for me to set one of them to “high” right before performing an encryption of plaintext.

Now I should import simpleserial.h and simpleserial.c to my project and I suppose that I have to adapt them to my system (for instance, in simpleserial.h there is an “#include” of HAL libraries, which is for other target boards). Am I right?

Somewhere else I also saw that you start building firmware from simpleserial-base.c. Do you consider starting from such file easier? Or is it a viable option to start from initializing the system and then import simpleserial.c and simpleserial.h and adapt them?

Thank you

2

Yeah, this is probably your best bet. All you need to implement getch() and putch() and #define SS_VER, make sure the C file is being compiled/linked, and that the header file is being included.

Alex

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