m3y54m / aes-in-c Goto Github PK

I AM TRYING TO HAVE AES ENCRYPTION FOR MY DATA (120 bytes in one second) WHICH IS TRANSMITTED THROUGH UART PERIPHERAL OF MY MICRO-CONTROLLER STM32F407 WHICH RUNS AT 168MHZ. SINCE THE MICRO-CONTROLLER DOESN'T HAVE A CRYPTO LIBRARY, I TRIED TO RUN THIS CODE AND I WANTED TO KNOW THE TIME IT TAKES FOR ENCRYPTION . IN THE CODE, IT SENT 16 BYTES OF DATA. SO IF I CAN FIND THE TIME FOR 16 BYTES, I COULD EASILY CALCULATE THE TIME FOR ENCRYPTION OF 120 BYTES BEFORE UART TRANSMISSION. TO CALCULATE THE TIME TAKEN, I JUST SET LED PIN HIGH BEFORE ENCRYPTION AND AFTER THE ENCRYPTION FUNCTION(AFTER CYPHER-TEXT IS GENERATED) I TURNED THE PIN LOW. THEN I TRIED TO CALCULATE THE TIMING. I ACTUALLY PUT A DELAY OF 1 SECOND ALSO. BUT AS SOON AS THE CODE RUNNING STARTS, THE EXECUTION MOVES TO THE HARD FAULT AND PROGRAM EXECUTION STOPS. HOW TO RESOLVE THE ISSUE. ALSO PLEASE HELP ME BY TELLING WHETHER I AM DOING SOMETHING IN A WRONG WAY TO CALCULATE THE TIMING OF AES FOR 120 BYTE DATA? LOOKING FORWARD FOR YOUR REPLY.
THANKS & REGARDS