New native recipient types

[str4d]

As added to the age specification in C2SP/C2SP#156.

[codecov]

Codecov Report

❌ Patch coverage is 57.62712% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.65%. Comparing base (c266bfa) to head (524aa83).

Files with missing lines	Patch %	Lines
age/src/native/tag.rs	50.00%	19 Missing ⚠️
age/src/native.rs	0.00%	5 Missing ⚠️
age/src/cli_common/recipients.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #590      +/-   ##
==========================================
- Coverage   56.77%   56.65%   -0.13%     
==========================================
  Files          43       45       +2     
  Lines        4507     4566      +59     
==========================================
+ Hits         2559     2587      +28     
- Misses       1948     1979      +31     

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[thrzl]

Hello! I've been working on an implementation of the MLKEM768x25519 identity type, and have reached compliance with age's Go implementation. I'm new to both Rust and cryptography, and this took quite a lot of work, so I'm sure the code health is less than exceptional. I've tried to leave some comments for you.

The code lies in a separate branch in this file (src-tauri/src/crypto/hybrid.rs). I ended up using the hpke-rs crate with the libcrux backend.

Hopefully this can be of some use to you.

[thrzl]

I've since merged my changes into the main branch, so a link to the up-to-date code is here. I'll likely spin it out into a new crate in the future.