nRF9160 hash MD5 calculation

RE: nRF9160 hash MD5 calculation

ANDRIJ GRABCZAK — Fri, 24 Feb 2023 13:15:06 GMT

Defining "MBEDTLS_MD5_C" in Kconfig of my project works, but it is weird and logicless... Thanks.

RE: nRF9160 hash MD5 calculation

Sigurd Hellesvik — Fri, 24 Feb 2023 12:51:24 GMT

Since CONFIG_MBEDTLS_MD5_C has no prompt in its Kconfig, it is not directly user assignable.

To set these, there are two alternatives:

Find a configuration that selects this, and set the other configuration
Define it in Kconfig in your project.

I did the second one in my project. See its Kconfig file.

Regards,
Sigurd Hellesvik

RE: nRF9160 hash MD5 calculation

ANDRIJ GRABCZAK — Fri, 24 Feb 2023 12:49:02 GMT

Yes, your example is fine. I added the "CONFIG_NORDIC_SECURITY_BACKEND=y" option to the configuration, but my project still does not compile. I compared the resulting configuration files "build/zephyr/.config" and noticed that I did not have the "CONFIG_MBEDTLS_MD5_C=y" option set. However, this option cannot be set manually in the project configuration. Zephyr documentation does not explain how to set this option. How to find out it?

RE: nRF9160 hash MD5 calculation

Sigurd Hellesvik — Fri, 24 Feb 2023 08:10:58 GMT

Aha,

Here is a project calling mbedtls_md5_init. This project builds, but I have not tested MD5 operations.

devzone.nordicsemi.com/.../md5_5F00_build_5F00_example.zip

Regards,
Sigurd Hellesvik

RE: nRF9160 hash MD5 calculation

ANDRIJ GRABCZAK — Thu, 23 Feb 2023 15:43:32 GMT

I didn't find how to activate calls to the old api in the given post. Actually my problem is that I am using old api in my big project on sdk version 2.0.2. And when trying to switch to a new SDK, linker errors appears of type: "an undefined reference to 'mbedtls_md5_...' .

RE: nRF9160 hash MD5 calculation

Sigurd Hellesvik — Thu, 23 Feb 2023 09:52:45 GMT

Our implementation of the PSA Crypto API does not support MD5.

A warning, remember that MD5 is generally not recommended:

I suggest using the legacy API if you need to use MD5 with the nRF Connect SDK.
See RSA example fails on psa_sign_hash returning -133 for an example of how to do this.

Regards,
Sigurd Hellesvik

RE: nRF9160 hash MD5 calculation

ANDRIJ GRABCZAK — Wed, 22 Feb 2023 14:51:57 GMT

No progress, patiently waiting for an answer...

RE: nRF9160 hash MD5 calculation

Sigurd Hellesvik — Wed, 22 Feb 2023 14:35:40 GMT

Hi,

Unfortunately, this case got lost in our system for a while. Sorry about the delay.
However, I will help you now.

Let me know if you have already had some progress on this case.

I have been able to reproduce your issue.

I will check if the MD5 is supported in our PSA Crypto API yet.
Then I will come back tomorrow or Friday with what I have found.

Regards,
Sigurd Hellesvik