private static async Task Client()
{
// Connect to the server using the named pipe.
using (var client = new NamedPipeClientStream(ServerName, PipeName, PipeDirection.InOut))
{
await client.ConnectAsync();
// Select the initial Noise protocol and configuration.
var initial = Protocol.Parse("Noise_NN_25519_ChaChaPoly_SHA256".AsSpan());
var config = new ProtocolConfig(initiator: true);
using (var noise = new NoiseSocket(initial, config, client))
{
// Send the initial handshake message to the server. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.WriteHandshakeMessageAsync(negotiationData : null);
// Receive the negotiation data from the server. In this example we will
// assume that the server decided to retry with Noise_XX_25519_AESGCM_BLAKE2b.
await noise.ReadNegotiationDataAsync();
// New protocol requires static key, so it's generated here.
using (var keyPair = KeyPair.Generate())
{
// The client again plays the role of the initiator.
config = new ProtocolConfig(initiator: true, s: keyPair.PrivateKey);
// Retry with a protocol different from the initial one.
noise.Retry(protocol, config);
// Ignore the empty handshake message.
await noise.IgnoreHandshakeMessageAsync();
// Finish the handshake using the new protocol.
await noise.WriteHandshakeMessageAsync();
await noise.ReadNegotiationDataAsync();
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync();
// Send the transport message to the server.
var request = Encoding.UTF8.GetBytes("I'm cooking MC's like a pound of bacon");
await noise.WriteMessageAsync(request);
// Receive the transport message from the
// server and print it to the standard output.
var response = await noise.ReadMessageAsync();
Console.WriteLine(Encoding.UTF8.GetString(response));
}
}
}
}
private static async Task Server()
{
// Listen for incoming TCP connections.
using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
socket.Bind(new IPEndPoint(IPAddress.Loopback, Port));
socket.Listen((int)SocketOptionName.MaxConnections);
// Generate the static key pair.
using (var keyPair = KeyPair.Generate())
{
var config = new ProtocolConfig(initiator: false, s: keyPair.PrivateKey);
// Accept the connection and initialize the NoiseSocket with its network stream.
using (var client = await socket.AcceptAsync())
using (var stream = new NetworkStream(client))
using (var noise = new NoiseSocket(initial, config, stream))
{
// Receive the negotiation data from the client. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.ReadNegotiationDataAsync();
try
{
await noise.ReadHandshakeMessageAsync();
}
catch (CryptographicException)
{
// The decryption of the initial handshake message failed
// because the client had an outdated remote static public key.
}
// The server decides to switch to a fallback protocol.
config = new ProtocolConfig(initiator: true, s: keyPair.PrivateKey);
noise.Switch(fallback, config);
// Send the first handshake message using the new protocol. In the
// real world the negotiation data would encode the details about
// the server's desicion to switch protocol.
await noise.WriteHandshakeMessageAsync(negotiationData : null, paddedLength : PaddedLength);
// Finish the handshake using the new protocol.
await noise.ReadNegotiationDataAsync();
await noise.ReadHandshakeMessageAsync();
// Receive the transport message from the client.
var request = await noise.ReadMessageAsync();
// Echo the message back to the client.
await noise.WriteMessageAsync(request, PaddedLength);
}
}
}
}
private static async Task Server()
{
// Listen for connections from TCP network clients.
var listener = new TcpListener(IPAddress.Loopback, Port);
listener.Start();
try
{
// Accept the connection from the TCP client.
using (var client = await listener.AcceptTcpClientAsync())
{
// Generate the static key pair.
using (var keyPair = KeyPair.Generate())
{
var config = new ProtocolConfig(initiator: false, s: keyPair.PrivateKey);
// Initialize the NoiseSocket with the network stream.
using (var stream = client.GetStream())
using (var noise = new NoiseSocket(stream))
{
// Receive the negotiation data from the client. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.ReadNegotiationDataAsync();
// Accept the offered protocol.
noise.Accept(protocol, config);
// Finish the handshake.
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync(paddedLength : PaddedLength);
await noise.ReadNegotiationDataAsync();
await noise.ReadHandshakeMessageAsync();
// Receive the transport message from the client.
var request = await noise.ReadMessageAsync();
// Echo the message back to the client.
await noise.WriteMessageAsync(request, PaddedLength);
}
}
}
}
finally
{
listener.Stop();
}
}
private static async Task Server()
{
// Create the named pipe and wait for the client to connect to it.
using (var server = new NamedPipeServerStream(PipeName, PipeDirection.InOut))
{
await server.WaitForConnectionAsync();
// Initialize the NoiseSocket.
using (var noise = new NoiseSocket(server))
{
// Receive the negotiation data from the client. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.ReadNegotiationDataAsync();
// Read the handshake message from the client, but without decrypting it.
await noise.IgnoreHandshakeMessageAsync();
// New protocol requires static key, so we generate it here.
using (var keyPair = KeyPair.Generate())
{
// The server decides to retry with a new protocol.
// It again plays the role of the responder.
var config = new ProtocolConfig(initiator: false, s: keyPair.PrivateKey);
noise.Retry(protocol, config);
// Request a retry from the client. In the real world the negotiation data
// would encode the details about the server's desicion to make a retry request.
await noise.WriteEmptyHandshakeMessageAsync(negotiationData : null);
// Receive the negotiation data from the client. The client will
// usually just confirm the server's choice of the retry protocol.
await noise.ReadNegotiationDataAsync();
// Finish the handshake using the new protocol.
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync();
await noise.ReadNegotiationDataAsync();
await noise.ReadHandshakeMessageAsync();
// Receive the transport message from the client.
var request = await noise.ReadMessageAsync();
// Echo the message back to the client.
await noise.WriteMessageAsync(request);
}
}
}
}
private static async Task Client()
{
// Connect to the server using the TCP socket.
using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
await socket.ConnectAsync(IPAddress.Loopback, Port);
// Generate the static key pair.
using (var keyPair = KeyPair.Generate())
{
// In this example the client has an outdated remote static public key. The server will
// fail to decrypt the initial handshake message, which will trigger a fallback.
var config = new ProtocolConfig(initiator: true, s: keyPair.PrivateKey, rs: new byte[32]);
// Initialize the NoiseSocket with the network stream.
using (var stream = new NetworkStream(socket))
using (var noise = new NoiseSocket(initial, config, stream))
{
// Send the initial handshake message to the server. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.WriteHandshakeMessageAsync(negotiationData : null, paddedLength : PaddedLength);
// Receive the negotiation data from the server. In this example we will
// assume that the server decided to switch to Noise_XX_25519_AESGCM_BLAKE2b.
await noise.ReadNegotiationDataAsync();
// The client now plays the role of the responder.
config = new ProtocolConfig(initiator: false, s: keyPair.PrivateKey);
// Switch to a protocol different from the initial one.
noise.Switch(fallback, config);
// Finish the handshake using the new protocol.
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync(paddedLength : PaddedLength);
// Send the padded transport message to the server.
var request = Encoding.UTF8.GetBytes("I'm cooking MC's like a pound of bacon");
await noise.WriteMessageAsync(request, PaddedLength);
// Receive the transport message from the
// server and print it to the standard output.
var response = await noise.ReadMessageAsync();
Console.WriteLine(Encoding.UTF8.GetString(response));
}
}
}
}
private static async Task Client()
{
// Open the TCP connection to the server.
using (var client = new TcpClient())
{
await client.ConnectAsync(IPAddress.Loopback, Port);
// Generate the static key pair.
using (var keyPair = KeyPair.Generate())
{
var config = new ProtocolConfig(initiator: true, s: keyPair.PrivateKey);
// Initialize the NoiseSocket with the network stream.
using (var stream = client.GetStream())
using (var noise = new NoiseSocket(protocol, config, stream))
{
// Send the initial handshake message to the server. In the real world the
// negotiation data would contain the initial protocol, supported protocols
// for the switch and retry cases, and maybe some other negotiation options.
await noise.WriteHandshakeMessageAsync(negotiationData : null, paddedLength : PaddedLength);
// Receive the negotiation data from the server. In this example we will
// assume that the server decided to accept the offered protocol.
await noise.ReadNegotiationDataAsync();
// Finish the handshake.
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync(paddedLength : PaddedLength);
// Send the padded transport message to the server.
var request = Encoding.UTF8.GetBytes("I'm cooking MC's like a pound of bacon");
await noise.WriteMessageAsync(request, PaddedLength);
// Receive the transport message from the
// server and print it to the standard output.
var response = await noise.ReadMessageAsync();
Console.WriteLine(Encoding.UTF8.GetString(response));
}
}
}
}
private static async Task Run()
{
using (var client = new TcpClient())
{
await client.ConnectAsync(IPAddress.Loopback, Port);
using (var keyPair = KeyPair.Generate())
{
var config = new ProtocolConfig(initiator: true, s: keyPair.PrivateKey);
using (var stream = client.GetStream())
using (var noise = new NoiseSocket(protocol, config, stream))
{
await noise.WriteHandshakeMessageAsync(negotiationData : clientNegotiationData, paddedLength : PaddedLength);
var serverNegotiationData = await noise.ReadNegotiationDataAsync();
if (serverNegotiationData.Length > 0)
{
throw new Exception("Unsupported Noise protocol.");
}
await noise.ReadHandshakeMessageAsync();
await noise.WriteHandshakeMessageAsync(paddedLength : PaddedLength);
var request = Encoding.UTF8.GetBytes("I'm cooking MC's like a pound of bacon");
await noise.WriteMessageAsync(request, PaddedLength);
var response = await noise.ReadMessageAsync();
Console.WriteLine(Encoding.UTF8.GetString(response));
}
}
}
}
