Could you give a short status update? The soft feature freeze is on the 25th ;)

Sure, I have an almost finished implementation at https://github.com/mguetschow/RIOT/tree/hashes-sha512-truncated including the necessary PSA Crypto glue code. Still outstanding:

• SHA-384 seems to fail on the nrf52840dk cryptocell for some reason, although it should be supported according to the cryptocell API. This needs to be further investigated.
• The PSA compilation tests in tests/sys/psa_crypto_* should be adapted to the change in examples/psa_crypto (they use a symlinked main.c)

If you wanted, I could split this in two PRs, one that adds truncated SHA512 support to sys/hashes and a second one that adds support for it to PSA crypto. The first one would be ready to be merged, while the second one would require some more work.

If you wanted, ..

I think that's up to you!

I could split this in two PRs

The linked branch has 4 commits with around ~1800 edits. Could be enough to justify the overhead of splitting it in two PRs.

one that adds truncated SHA512 support to sys/hashes and a second one that adds support for it to PSA crypto

Both are probably minor enough to still get them in during soft-freeze :>

see #20484 for the implementation in sys/hashes

Everything is checked off! 🎉

Can this issue be closed?

I would keep it open until #20598 is merged, which is currently hold back by #20545. The former should close the issue automatically as soon as it is merged.