## Description

Please write a few sentences describing the overall goals of the pull request's commits.



## PR checklist

Please add/remove strikethrough ~~ as appropriate, and add any relevant link/s to the end of the line.

- [ ] **changelog** provided, ~not required because:~
- [ ] **dev PR** provided #, ~not required because:~
- [ ] **3.6 PR** provided #, ~not required because:~
- [ ] **2.28 PR** provided #, ~not required because:~
- **tests**  provided,  ~covered~ #, ~not required because:~



## Notes for the submitter

Please refer to the [contributing guidelines](https://github.com/Mbed-TLS/mbedtls/blob/development/CONTRIBUTING.md), especially the
checklist for PR contributors.

Help make review efficient:
* Multiple simple commits
  - please structure your PR into a series of small commits, each of which does one thing
* Avoid force-push
  - please do not force-push to update your PR - just add new commit(s)
* See our [Guidelines for Contributors](https://mbed-tls.readthedocs.io/en/latest/reviews/review-for-contributors/) for more details about the review process.