CCS/CC1312R: AES CBC support

Chris Liu55

Intellectual 670 points

Part Number: CC1312R

Tool/software: Code Composer Studio

Hi,

Where can I found any about aes cbc example code?

I checked this page

and found that CC13x2 have AESCBCCC26XX.h for aes cbc support but not useful.

Thanks.

over 6 years ago

0 TER over 6 years ago

TI__Guru**** 317180 points

Check AESCBC.h in C:\ti\simplelink_cc13x2_sdk_2_30_00_45\source\ti\drivers

0 IUsedToBeARealPerson (M-W) over 6 years ago

TI__Guru 58425 points

Hi Chris,

You can find example code in driver top-level header-file:

dev.ti.com/.../_a_e_s_c_b_c_8h.html

0 Chris Liu55 over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Intellectual 670 points

Hi M-W, TER,

For using AES CBC purpose I installed the newest CCS(8.2.0.00007) and CC1312R SDK(2_30_00_45).

I tried the example and found some problem:

For decrypt example the code needs to modify as

    operation.input             = ciphertext;
    operation.output            = plaintext;

and use only encrypt or decrypt example code seems work well, but when I try to both encrypt and decrypt the previous encrypted text it failed to decrypt.

I attached my code, could you help to check? Thank you.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/156/empty_5F00_CC1312R1_5F00_LAUNCHXL_5F00_tirtos_5F00_ccs.7z

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to Chris Liu55

TI__Guru 58425 points

Hi Chris,

This is a known issue in the driver (not the documentation, but the back-to-back encryption). You can work around this by importing the driver source file (AESCBCCC26XX.c) to your project and removing the following from line 312:

CRYPTO_AESCTL_SAVE_CONTEXT

Re-compiling without this set should fix your back-to-back issue.

Sub-1 GHz

Sub-1 GHz forum

CCS/CC1312R: AES CBC support