| public DecryptKeyExchange ( byte keyEx ) : byte[] | ||
| keyEx | byte | The key exchange data within which the shared key is hidden. |
| Результат | byte[] | |
public static void Main(string[] args)
{
ECDiffieHellmanCng alice = new ECDiffieHellmanCng();
//alice.DeriveKeyMaterial(
//CngKey.Import(
// create a new DH instance
DiffieHellman dh1 = new DiffieHellmanManaged();
// export the public parameters of the first DH instance
DHParameters dhp = dh1.ExportParameters(false);
// create a second DH instance and initialize it with the public parameters of the first instance
DiffieHellman dh2 = new DiffieHellmanManaged(dhp.P, dhp.G, 160);
// generate the public key of the first DH instance
byte[] ke1 = dh1.CreateKeyExchange();
// generate the public key of the second DH instance
byte[] ke2 = dh2.CreateKeyExchange();
// let the first DH instance compute the shared secret using the second DH public key
byte[] dh1k = dh1.DecryptKeyExchange(ke2);
// let the second DH instance compute the shared secret using the first DH public key
byte[] dh2k = dh2.DecryptKeyExchange(ke1);
// print both shared secrets to verify they are the same
Console.WriteLine("Computed secret of instance 1:");
PrintBytes(dh1k);
Console.WriteLine("\r\nComputed secret of instance 2:");
PrintBytes(dh2k);
Console.WriteLine("\r\nPress ENTER to continue...");
Console.ReadLine();
}
private static string Test1() {
DiffieHellman dh1 = new DiffieHellmanManaged();
DiffieHellman dh2 = new DiffieHellmanManaged();
string secret1 = Convert.ToBase64String(dh1.DecryptKeyExchange(dh2.CreateKeyExchange()));
string secret2 = Convert.ToBase64String(dh2.DecryptKeyExchange(dh1.CreateKeyExchange()));
Assert.AreEqual(secret1, secret2, "Secret keys do not match for some reason.");
return secret1;
}
internal void Add(ITransport transport, TransportCallback connectCallback)
{
try {
// XXX: This should be negotiated as part of the initial handshake.
transport.Encryptor = new AESTransportEncryptor();
transports.Add (transport);
if (NewTransportAdded != null)
NewTransportAdded (transport);
LoggingService.LogInfo(String.Format ("Transport {0} added", transport.ToString()));
if (transport.Incoming == true) {
if (connectCallback != null)
throw new ArgumentException ("You can only specify a ConnectCallback for outoging connections!");
if (transport.Encryptor != null) {
DiffieHellmanManaged dh = new DiffieHellmanManaged ();
byte[] keyxBytes = new byte[transport.Encryptor.KeyExchangeLength];
transport.Receive (keyxBytes, 0, keyxBytes.Length);
keyxBytes = dh.DecryptKeyExchange (keyxBytes);
byte[] keyBytes = new byte[transport.Encryptor.KeySize];
byte[] ivBytes = new byte[transport.Encryptor.IvSize];
Array.Copy (keyxBytes, 0, keyBytes, 0, keyBytes.Length);
Array.Copy (keyxBytes, keyBytes.Length, ivBytes, 0, ivBytes.Length);
keyxBytes = dh.CreateKeyExchange ();
transport.Send (keyxBytes, 0, keyxBytes.Length);
transport.Encryptor.SetKey(keyBytes, ivBytes);
}
//Receive connection type, which is a ulong (8 bytes)
byte[] responseBuffer = new byte[8];
transport.Receive (responseBuffer, 0, 8);
ulong connectionType = EndianBitConverter.ToUInt64 (responseBuffer, 0);
// Recieve network ID (64 bytes)
responseBuffer = new byte[64];
transport.Receive (responseBuffer, 0, 64);
string networkId = EndianBitConverter.ToString (responseBuffer).Replace ("-", "");
// Match to one of our known networks!
foreach (Network network in Core.Networks) {
if (network.NetworkID == networkId) {
transport.Network = network;
}
}
if (transport.Network == null) {
throw new Exception (String.Format ("Unknown network: {0}.", networkId));
}
transport.ConnectionType = connectionType;
if (connectionType == ConnectionType.NodeConnection) {
LocalNodeConnection connection = new LocalNodeConnection(transport);
transport.Operation = connection;
transport.Network.AddConnection(connection);
connection.Start();
} else if (connectionType == ConnectionType.TransferConnection) {
Core.FileTransferManager.NewIncomingConnection(transport);
} else {
throw new Exception(String.Format("Unknown connection type: {0}.",
connectionType.ToString()));
}
} else {
if (connectCallback == null) {
throw new ArgumentNullException("connectCallback");
}
connectCallbacks.Add (transport, connectCallback);
LoggingService.LogInfo("Transport {0} connecting...", transport);
TransportCallback callback = new TransportCallback (OnConnected);
transport.Connect (callback);
}
} catch (Exception ex) {
transport.Disconnect (ex);
RaiseTransportError(transport, ex);
}
}
private void OnConnected(ITransport transport)
{
try {
LoggingService.LogInfo("Transport {0} connected.", transport);
if (transport.Encryptor != null) {
DiffieHellmanManaged dh = new DiffieHellmanManaged ();
byte[] keyxBytes = dh.CreateKeyExchange ();
transport.Send (dh.CreateKeyExchange (), 0, keyxBytes.Length);
keyxBytes = new byte [transport.Encryptor.KeyExchangeLength];
transport.Receive (keyxBytes, 0, transport.Encryptor.KeyExchangeLength);
keyxBytes = dh.DecryptKeyExchange (keyxBytes);
byte[] keyBytes = new byte[transport.Encryptor.KeySize];
byte[] ivBytes = new byte[transport.Encryptor.IvSize];
Array.Copy (keyxBytes, 0, keyBytes, 0, keyBytes.Length);
Array.Copy (keyxBytes, keyBytes.Length, ivBytes, 0, ivBytes.Length);
transport.Encryptor.SetKey(keyBytes, ivBytes);
}
byte[] connectionType = EndianBitConverter.GetBytes (transport.ConnectionType);
transport.Send (connectionType, 0, connectionType.Length);
byte[] networkId = Common.SHA512 (transport.Network.NetworkName);
transport.Send (networkId, 0, networkId.Length);
// Ready, Steady, GO!
TransportCallback callback = (TransportCallback) connectCallbacks [transport];
connectCallbacks.Remove (transport);
callback (transport);
} catch (Exception ex) {
transport.Disconnect (ex);
RaiseTransportError(transport, ex);
}
}
public static byte[] ComputeSharedKey(DHPrivateKey privateKey, DHPublicKey publicKey)
{
DiffieHellman dh = new DiffieHellmanManaged(privateKey.P, privateKey.G, privateKey.X);
return dh.DecryptKeyExchange(publicKey.KeyExchangeData);
}
