.NET Standard 1.3 implementation of the Noise Protocol Framework (revision 33 of the spec). It features:

• AESGCM and ChaChaPoly ciphers
• Curve25519 Diffie-Hellman function
• SHA256, SHA512, BLAKE2s, and BLAKE2b hash functions
• Support for multiple pre-shared symmetric keys
• All known one-way and interactive patterns from the specification
• XXfallback handshake pattern

Usage

1. Include the Noise namespace.

using Noise;

2. Choose the handshake pattern and cryptographic functions.

var protocol = new Protocol(
  HandshakePattern.IK,
  CipherFunction.ChaChaPoly,
  HashFunction.Blake2s,
  PatternModifiers.Psk2
);

3. Start the handshake by instantiating the protocol with the necessary parameters.

// s is communicated out-of-band
// psk is a 32-byte pre-shared symmetric key

var initiator = protocol.Create(
  initiator: true,
  rs: rs,
  psks: new byte[][] { psk }
);

var responder = protocol.Create(
  initiator: false,
  s: s,
  psks: new byte[][] { psk }
);

4. Send and receive messages.

(written, hash, transport) = state.WriteMessage(message, outputBuffer);
(read, hash, transport) = state.ReadMessage(received, inputBuffer);

written = transport.WriteMessage(message, outputBuffer);
read = transport.ReadMessage(received, inputBuffer);

See Noise.Examples for the complete example.

Installation

> dotnet add package Noise.NET --version 1.0.0