mbedtls backend undefined reference to many things

RE: mbedtls backend undefined reference to many things

JGusler — Tue, 04 Oct 2022 14:16:12 GMT

Okay, for anyone finding this thread later, here is what all I had to do AES CBC encryption with mbedtls backend

In mbedtls/config.h

uncomment MBEDTLS_MEMORY_BUFFER_ALLOC_C
uncomment MBEDTLS_PLATFORM_C
uncomment MBEDTLS_PLATFORM_MEMORY

In sdk_config.h

NRF_CRYPTO_ENABLED 1
NRF_CRYPTO_ALLOCATOR 3
NRF_CRYPTO_BACKEND_MBEDTLS_ENABLED 1
NRF_CRYPTO_BACKEND_MBEDTLS_AES_CBC_ENABLED 1
might need NRF_CRYPTO_BACKEND_NRF_HW_RNG_ENABLED 1, not sure, I added this part way through as part of my own requirements to randomly generate the initialization vector

In the flash_placement.xml

Verify you have <ProgramSection alignment="4" keep="Yes" load="Yes" name=".crypto_data" inputsections="*(SORT(.crypto_data*))" address_symbol="__start_crypto_data" end_symbol="__stop_crypto_data" />

Depending on what development environment, make sure all the following are added to the project

And in main.c include all the following

This worked for me, should get you close if not the whole way there. It was a pain to figure out what was missing.

RE: mbedtls backend undefined reference to many things

JGusler — Tue, 04 Oct 2022 13:16:54 GMT

I don't know, I thought having the includes in those files where the issues are would do the including, so I don't know what my responsibility is in main vs the added on .c files' am as far as I can tell. And I can't do that because I'm already doing that with other aspects, of this project. This is based on bl_app_uart and I want to add on crypto.

RE: mbedtls backend undefined reference to many things

Jared — Tue, 04 Oct 2022 11:20:29 GMT

Hi there,

Have you already included the files that it's complaining about? Sometimes you need to keep adding source files to your project since the files you just added is dependent on other source files that hasn't been added to the project. For projects that use crypto lib, it would be easier to just start with a crypto example that already has included the necessary files and then add your code into that example.

regards

Jared