[TF-M] Tip on cloning TF-M on OS X Monterey

I recently switched to a new MBP that ships with OS X Monterey, and on both 12.0 and 12.1 (released this week) git clone seems to be broken when you're using HTTP rather than SSH:

digital envelope routines:CRYPTO_internal:bad key length

In order to clone TF-M, I had to make the following changes.

1. Add these details to $HOME/.ssh/config (microbuilder being my github username, associated with my TF-M account):

Host trustedfirmware.org User microbuilder Hostname review.trustedfirmware.org Port 29418 IdentityFile ~/.ssh/id_rsa IdentitiesOnly yes

2. Then try to clone with:

$ git clone trustedfirmware.org:/TF-M/trusted-firmware-m.git

This fails, however, since it tries to clone tf-m-tests.git, so:

3. Edit lib/ext/tf-m-tests/fetch_repo.cmake, changing:

FetchContent_Declare(tfm_test_repo GIT_REPOSITORY trustedfirmware.org:TF-M/tf-m-tests.git # GIT_REPOSITORY https://git.trustedfirmware.org/TF-M/tf-m-tests.git GIT_TAG ${TFM_TEST_REPO_VERSION} GIT_PROGRESS TRUE )

This let me at least clone TF-M until the issues with HTTP-based cloning are fixed.

Hope this is useful to someone else working on OS X natively.

Kevin