david415 / snow

A Rust implementation of the Noise Protocol (https://noiseprotocol.org)

Snow

An implementation of Trevor Perrin's Noise Protocol that is designed to be Hard To Fuck Up™.

🔥 This library is in the state of preview - do everyone a favor and only use this for fun or criticizing the author's code for now.

What's it look like?

See examples/simple.rs for a more complete TCP client/server example.

let mut noise = NoiseBuilder::new("Noise_NN_ChaChaPoly_BLAKE2s".parse()?)
                    .build_initiator()?;
 
let mut buf = [0u8; 65535];
 
// write first handshake message
noise.write_message(&[], &mut buf)?;
 
// receive response message
let incoming = receive_message_from_the_mysterious_ether();
noise.read_message(&incoming, &mut buf)?;
 
// complete handshake, and transition the state machine into transport mode
let mut noise = noise.into_transport_mode()?;

See the full documentation at https://docs.rs/snow.

Implemented

Snow is currently feature-frozen on its current rev32 implementation, since revision 33 will be releasing shortly.

• Rekey()
• pskN modifier
• specifying PSKs after building Session
• fallback modifier

Crypto

Cryptographic providers are swappable through NoiseBuilder::with_provider(), but by default it chooses select, artisanal pure-Rust implementations (see Cargo.toml for a quick overview).

Acceleration

If you enable the ring-accelerated feature, Snow will default to choosing ring's much faster crypto implementations when supported.

If you enable the ring-resolver feature, Snow will include a ring_wrapper module as well as a RingAcceleratedResolver available to be used with NoiseBuilder::with_resolver().