transport/noise: Implement NoiseExtensions

[oblique]

Description

NoiseExtensions and a way to retrieve them after an upgrade is not currently implemented

Motivation

I was trying to implement a Transport and StreamMuxer that was using WebTransport browser API. After implementing both I couldn't establish a connection because handshake was failing.

The Go implementation is sending early data as part of the handshake procedure and for that we need NoiseExtensions.

Current Implementation

Currently I didn't find any way to send early data. Are early data what we call prologue in the Rust implementation?

Are you planning to do it yourself in a pull request?

Maybe. I'm still trying to understand the implementation.

[thomaseizinger]

Prologue gets hashed into the session state. The handshake will fail if the parties set different prologues.

Early data is currently not exposed but I am guessing our underlying noise library supports it so it is just a matter of exposing that too.

[mxinden]

Are early data what we call prologue in the Rust implementation?

To add to Thomas' comment above, they are not the same. Both are a Noise concept. See https://noiseprotocol.org/noise.html#prologue.

Are you planning to do it yourself in a pull request?

Maybe. I'm still trying to understand the implementation.

That would be very welcomed.

Related see also #3846 and #3825.