Tetanus noise xk (#1881)
* Noise XK work in progress.
* A whole lot more Noise_XK work... exchange almost done.
* Delete a bunch of commented out old Noise_IK code.
* Add back in send() and a few other things to Noise_XK ZSSP.
* Some p384 experiment in attic
* A ton of ZSSP work, and put MPL on ZSSP.
* updated kbkdf512 to use the modern nist standard
* Parameterize KBKDF on resulting output key size the way NIST likes.
* updated variable comment
* Make the label a const parameter on kbkdf.
* updated variable comment
* Add MPL to utils and other stuff.
* layout tweak
* Some more ZSSP work and a VDF we may use.
* warning removal
* More ZSSP work, add benchmarks for mimcvdf.
* Almost ready to test...
* Build fix.
* Add automatic retransmission in the earliest stages of session init.
* Just about ready to test... wow.
* It opens a session.
* ZSSP basically works...
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Co-authored-by: mamoniot <mamoniot@protonmail.com>
Warning removal.
remove old docs
Remove old tests from ZSSP, new test in main() can also be made into a unit test in the future.
Add key_info() to get key information.
Rekeying is now tested and works.
Show key fingerprint.
Factor out memory:: stuff, does not appear to have any real performance benefit.
Rework defragmentation, and it now tolerates very poor link quality pretty well.
Circuit breaker for incoming defrag queue, and ZSSP now works very well even under very poor network conditions.
Format tweak.
ZSSP API updates.
Just a bit of final ZSSP cleanup before moving to another thing.
