Having trouble including cc310 library into Zephyr on ncs v1.3.0 release

[Barry]

So with my NRF52840 board I am trying to use the cc310 backend in zephyr. My project did work until I recently tried to upgrade to ncs v 1.3.0 . The issue was that the build would terminate at the linking stage because it could not find the definition for any of the cc310 backend operations (like mbedtls_sha256_init). 

I went through all the cmakelist files and kconfigs and whatnot. Ultimately I changed line 202 in \nrfxlib\nrf_security\src\mbedtls\CMakeLists.txt

from

target_link_libraries(mbedtls_base_vanilla PRIVATE mbedcrypto_cc310)

to

target_link_libraries(mbedtls_base_vanilla PRIVATE mbedcrypto_cc310_imported)

And everything linked fine.

I am not a cmake expert by any means.  I really barely understand whats going on sometimes. I see where a few lines up at 175, you add the cc310 sub-directory, and that cmakelist file does this:

set(cc310_libs
mbedcrypto_cc310_imported
mbedcrypto_cc310_noglue
)

combine_archives(mbedcrypto_cc310 "${cc310_libs}")

So that would suggest to me that the mbedcrypto_cc310_imported and mbedcrypto_cc310_no glue libraries were combined together into a single mbedcrypto_cc310 library. And That would make you version of line 202 make sense. However nothing from mbedcrypto_cc310_imported was getting linked.

In my build output, I could see modules/nrfxlib/nrf_security/src/mbedtls/cc310/libmbedcrypto_cc310.a being linked against at the end, but that file is almost empty (990 bytes). It certainly did not contain the entirety of

mbedcrypto_cc310_imported

which for me is 

nrfxlib/crypto/nrf_cc310_mbedcrypto/lib/cortex-m4/soft-float/no-interrupts/libnrf_cc310_mbedcrypto_0.9.2.a 

which is 401KB

Anyway maybe I am configuring something wrong, but my guess is there is an issue in the cmake list files.

I am not sure how the combine archives function works, but my guess is the problem is there. But I don't really know.

And like I said, my work around does the job, but I don't want to have to fork the repo just to make this one fix. So hopefully you can do a new release or tell me what I am doing wrong.

Let me know if you want any more info

Thanks

[Didrik Rokhaug]

Hi, and thanks for the report.

Sadly, I have not had much time to look at it today but will come back tomorrow for a deeper look at the issue.

Are you building a sample or a custom application?

Do you have a simple sample that demonstrates the issue?

Best regards,

Didrik

[Barry]

This is a custom application. I don't have a simple sample, but I could make one maybe. At a basic level, it would be a project that tries to use any of the functions the cc310 can do, and thus requires a mbedcrypto static library to be compiled into the code.