NRF52810 Exception using AES ECB on SDK16

[Zhang|]

Hi，

I ported examples\crypto\nrf_crypto\aes\aes_all_cli on the NRF52810 project ECB encrypts related files. During the test, it was found that the NRF52810 project would make calculation errors during the encryption operation.

When I switch to the NRF52832 project under the same routine, there will be no error in the encryption operation. May I ask what is the cause of this?

This is the calculation process of NRF52832 project encryption，It is correct：

This is the calculation process of NRF52810 project encryption，It is wrong：

[Emil Lenngren]

Any reason you are doing everything entirely in software instead of using the hardware ECB peripheral?

[Zhang|]

My original goal was to decrypt it with Android software.

Since we do not know much about AES of NRF52810, we will use examples\crypto\nrf_crypto\aes\aes_all_cli routine to learn.

I don't know how to use the hardware encryption method you mentioned.

[Vidar Berg]

Hi,

Please try to increase your call stack size to see if it makes any difference. The call stack is 8K on the 52832 by default, while it is only 2kB on the 52810. 

Zhang| said:

I don't know how to use the hardware encryption method you mentioned.

The ECB — AES electronic codebook mode encryption peripheral supports HW accelerated encryption, but not decryption.

[Zhang|]

Hello

Thank you very much for your answer. I will try it through the method you provided.

I'll start by looking at the hardware ECB encryption.

[Zhang|]

Hi，

I tried to change the stack size to 8K, but it didn't work and was still decrypting errors when actually using it.

As for the hardware ECB, I tried it, but it didn't seem to work, and the main thing I needed was decryption, encryption just to verify the decryption was correct.

So back to the original question, why did 52810 have a calculation error in the process of encryption and decryption?

[Vidar Berg]

Hi,

I have not managed to reproduce this here. I used the same example from nRF5 SDK 17.1.0 and made a new project configuration to run on the nRF52810. This configuration is included below. Can you try it and see if you get the same result?

Project to be copied to \crypto\nrf_crypto\aes\aes_all_cli:

7506.pca10040e.zip

Result when tested on a 52810:

[Zhang|]

Hi,

I'll give it a try. Thank you for your help.

[Zhang|]

Hi,

I can successfully complete the encryption and decryption by using the nRF52810 project you gave me. Thank you very much!