MSP432P401R: AES CBC v ECB question

ajayt

Part Number: MSP432P401R

I am having some issues with the AES in MSP432.

I have tried the sample code from TI which is based on AES ECB mode, that works fine. But when I modified the code to work in AES CBC, I was not able to get the encryption done correctly. The cipher text results was different compared to online generated (done for verification), after sometime I noticed that actually it seems that the generated cipher text result was still based on ECB method instead of CBC method.

Could you help me to check on this ? if possible does TI have a tested code that works in AES CBC for the MSP432 ?

Thank you.

over 5 years ago

0 JD Crutchfield over 5 years ago

TI__Mastermind 30545 points

Hello Ajayt,

I apologize for the delay, I'm looking into this now. I see in the user's guide that the AES module for MSP432P401R supports CBC, but I'm not sure if we have a code example for this mode.

These are the only 2 code examples I am currently aware of for AES encryption on the MSP432P401R, but at first glance, I'm not sure what mode they are operating in:

Driver Lib: https://dev.ti.com/tirex/explore/node?node=AGkzz4fSFaNNU2rCPKjXbw__z-lQYNj__LATEST

0 JD Crutchfield over 5 years ago in reply to JD Crutchfield

TI__Mastermind 30545 points

Ajayt,

I modified the Register level example linked above, and configured it to CBC mode. I will attach that example here.

msp432p401x_aes_02_CBC_MSP_EXP432P401R_nortos_ccs.zip

Thanks,

Arm-based microcontrollers

Arm-based microcontrollers forum

MSP432P401R: AES CBC v ECB question