Noise Protocol implementation for WhatsApp with AES-256-GCM.

This crate provides both a generic Noise Protocol XX state machine and WhatsApp-specific handshake utilities.

Structure

• NoiseState - Generic Noise XX protocol state machine
• NoiseHandshake - WhatsApp-specific wrapper with libsignal DH
• HandshakeUtils - WhatsApp protocol message building/parsing

Example (Generic)

use wacore_noise::{NoiseState, generate_iv};

let mut noise = NoiseState::new(b"Noise_XX_25519_AESGCM_SHA256\0\0\0\0", &prologue)?;
noise.authenticate(&my_ephemeral_public);
noise.mix_key(&shared_secret)?;
let ciphertext = noise.encrypt(plaintext)?;
let keys = noise.split()?;

Example (WhatsApp)

use wacore_noise::{NoiseHandshake, HandshakeUtils};

let mut nh = NoiseHandshake::new(NOISE_START_PATTERN, &WA_CONN_HEADER)?;
nh.authenticate(&ephemeral_public);
nh.mix_shared_secret(&private_key, &their_public)?;
let (write_key, read_key) = nh.finish()?;