Firmware over the air - Produce hash calculation

[Hkhan7861]

Hi all 

How would I be able to generate and view the calculated hash that i get while using the dfu library?  Is there an easy way.  I'm hoping to generate one single hash after i do the the complete download which involved running dfu_write continsously. 

Thank you in advance

[Hung Bui]

Hi Hkhan, 
I assume you are using the dfu libraries in nRF Connect SDK and the function you mentioned is dfu_target_write , not dfu_write ? 

I am not so familiar with the dfu library but maybe you can refer to function get_has_from_flash() to get the hash value. You can see how it's used to compare the actual calculated hash and the received hash on the manifest. 
https://github.com/nrfconnect/sdk-nrf/blob/main/subsys/dfu/fmfu_fdev/src/fmfu_fdev.c#L237

[Hkhan7861]

Hi Hung

I'm  having trouble running crypto samples on our custom board that uses the nrf9160 chip.  The error i get when trying to use 'psa_crypto_init' is " Could not setup the hash operation! Error -134"  I'm assuming its because its not on the list of boards and because it is a non-secure version of the board.  Is there a way i can bypass this?

Thank you in advance!

[Hung Bui]

Hi HKhan, 

Building an application on _ns non-secure board is the correct way of getting security, especially for PSA. 

Please take a look here:  An Introduction to Trusted Firmware-M (TF-M) 

I did a quick test here with a cryto sample (rsa ) and I don't see a problem when building for nRF9160dk_nrf9160ns board. 

[Hkhan7861]

Hi Hung

Unfortunately we have custom board which uses the nrf9160.  Have you tried building the sha256 sample?  In my configuration i have this :

CONFIG_MBEDTLS_PSA_CRYPTO_C=y

CONFIG_MBEDTLS_ENABLE_HEAP=y

CONFIG_MBEDTLS_HEAP_SIZE=8192

CONFIG_PSA_CRYPTO_DRIVER_OBERON=n

CONFIG_PSA_CRYPTO_DRIVER_CC3XX=y

But im still getting the above error.  Do you any idea why this could be happening.  We are building this into the lwm2m sample.

[Hkhan7861]

It is essentially not a building issue as the program runs.  

[Hung Bui]

Hi HKhan, 
I can build (and run) the sha256 with no problem. 

But from what I can see the Oberon driver is used in the sample. Is there any reason you don't want to enable Oberon ?