public static void Run(NetPeer peer)
{
//
// Test XTEA
//
NetXtea xtea = new NetXtea("TopSecret");
byte[] original = new byte[16];
NetRandom.Instance.NextBytes(original);
byte[] encrypted = new byte[original.Length];
xtea.EncryptBlock(original, 0, encrypted, 0);
xtea.EncryptBlock(original, 8, encrypted, 8);
byte[] decrypted = new byte[original.Length];
xtea.DecryptBlock(encrypted, 0, decrypted, 0);
xtea.DecryptBlock(encrypted, 8, decrypted, 8);
// compare!
for (int i = 0; i < original.Length; i++)
if (original[i] != decrypted[i])
throw new NetException("XTEA fail!");
Console.WriteLine("XTEA OK");
NetOutgoingMessage om = peer.CreateMessage();
om.Write("Hallon");
om.Write(42);
om.Write(5, 5);
om.Write(true);
om.Write("kokos");
om.Encrypt(xtea);
// convert to incoming message
NetIncomingMessage im = Program.CreateIncomingMessage(om.PeekDataBuffer(), om.LengthBits);
im.Decrypt(xtea);
if (im.ReadString() != "Hallon")
throw new NetException("fail");
if (im.ReadInt32() != 42)
throw new NetException("fail");
if (im.ReadInt32(5) != 5)
throw new NetException("fail");
if (im.ReadBoolean() != true)
throw new NetException("fail");
if (im.ReadString() != "kokos")
throw new NetException("fail");
Console.WriteLine("Message encryption OK");
}
/// <summary>
/// Encrypt this message using the XTEA algorithm; no more writing can be done before sending it
/// </summary>
public void Encrypt(NetXtea tea)
{
// need blocks of 8 bytes
WritePadBits();
int blocksNeeded = (m_bitLength + 63) / 64;
int missingBits = (blocksNeeded * 64) - m_bitLength;
int missingBytes = NetUtility.BytesToHoldBits(missingBits);
for (int i = 0; i < missingBytes; i++)
Write((byte)0);
byte[] result = new byte[m_data.Length];
for (int i = 0; i < blocksNeeded; i++)
tea.EncryptBlock(m_data, (i * 8), result, (i * 8));
m_data = result;
}
public void Decrypt(NetXtea tea)
{
// requires blocks of 8 bytes
int blocks = m_bitLength / 64;
if (blocks * 64 != m_bitLength)
{
throw new NetException("Wrong message length for XTEA decrypt! Length is " + m_bitLength + " bits");
}
byte[] result = new byte[m_data.Length];
for (int i = 0; i < blocks; i++)
{
tea.DecryptBlock(m_data, (i * 8), result, (i * 8));
}
m_data = result;
}
/// <summary>
/// Encrypt this message using the XTEA algorithm; no more writing can be done before sending it
/// </summary>
public void Encrypt(NetXtea tea)
{
// need blocks of 8 bytes
WritePadBits();
int blocksNeeded = (m_bitLength + 63) / 64;
int missingBits = (blocksNeeded * 64) - m_bitLength;
int missingBytes = NetUtility.BytesToHoldBits(missingBits);
for (int i = 0; i < missingBytes; i++)
{
Write((byte)0);
}
byte[] result = new byte[m_data.Length];
for (int i = 0; i < blocksNeeded; i++)
{
tea.EncryptBlock(m_data, (i * 8), result, (i * 8));
}
m_data = result;
}
public void Decrypt(NetXtea tea)
{
// requires blocks of 8 bytes
int blocks = m_bitLength / 64;
if (blocks * 64 != m_bitLength)
throw new NetException("Wrong message length for XTEA decrypt! Length is " + m_bitLength + " bits");
byte[] result = new byte[m_data.Length];
for (int i = 0; i < blocks; i++)
tea.DecryptBlock(m_data, (i * 8), result, (i * 8));
m_data = result;
}
/// <summary>
/// Creates a Lidgren network server with an application name and the port number
/// to establish the connection.
/// </summary>
/// <param name="appName">An application name. Can be any names</param>
/// <param name="portNumber">The port number to establish the connection</param>
public LidgrenServer(String appName, int portNumber)
{
this.portNumber = portNumber;
this.appName = appName;
enableEncryption = false;
IPHostEntry ipEntry = Dns.GetHostEntry(Dns.GetHostName());
IPAddress addr = ipEntry.AddressList[0];
myIPAddress = addr.GetAddressBytes();
approveList = new Dictionary<string, string>();
prevSender = null;
clients = new Dictionary<string, NetConnection>();
clientList = new List<NetConnection>();
// Create a net configuration
netConfig = new NetPeerConfiguration(appName);
netConfig.MaximumConnections = 32;
netConfig.Port = portNumber;
netConfig.EnableMessageType(NetIncomingMessageType.ConnectionApproval);
netConfig.EnableMessageType(NetIncomingMessageType.DiscoveryRequest);
xtea = new NetXtea("GoblinXNA");
sequenceChannel = 0;
useSequencedInsteadOfOrdered = false;
}
/// <summary>
/// Creates a Lidgren network client with an application name, the port number,
/// and the host name.
/// </summary>
/// <param name="appName">An application name. Must be the same as the server app name.</param>
/// <param name="portNumber">The port number to establish the connection</param>
/// <param name="hostName">The name of the server machine</param>
public LidgrenClient(String appName, int portNumber, String hostName)
{
this.appName = appName;
this.portNumber = portNumber;
isConnected = false;
isServerDiscovered = false;
shutDownForced = false;
enableEncryption = false;
waitForServer = false;
connectionTrialTimeout = -1;
elapsedTime = 0;
IPHostEntry ipEntry = Dns.GetHostEntry(Dns.GetHostName());
myAddr = ipEntry.AddressList[0];
myIPAddress = myAddr.GetAddressBytes();
IPHostEntry hostEntry = Dns.GetHostEntry(hostName);
IPAddress hostAddr = hostEntry.AddressList[0];
hostPoint = new IPEndPoint(hostAddr, portNumber);
isLocalAddress = IsLocalIpAddress(hostName);
// Create a configuration for the client
netConfig = new NetPeerConfiguration(appName);
xtea = new NetXtea("GoblinXNA");
sequenceChannel = 0;
useSequencedInsteadOfOrdered = false;
}
public static void Run(NetPeer peer)
{
//
// Test XTEA
//
NetXtea xtea = new NetXtea("TopSecret");
byte[] original = new byte[16];
NetRandom.Instance.NextBytes(original);
byte[] encrypted = new byte[original.Length];
xtea.EncryptBlock(original, 0, encrypted, 0);
xtea.EncryptBlock(original, 8, encrypted, 8);
byte[] decrypted = new byte[original.Length];
xtea.DecryptBlock(encrypted, 0, decrypted, 0);
xtea.DecryptBlock(encrypted, 8, decrypted, 8);
// compare!
for (int i = 0; i < original.Length; i++)
if (original[i] != decrypted[i])
throw new NetException("XTEA fail!");
Console.WriteLine("XTEA OK");
NetOutgoingMessage om = peer.CreateMessage();
om.Write("Hallon");
om.Write(42);
om.Write(5, 5);
om.Write(true);
om.Write("kokos");
om.Encrypt(xtea);
// convert to incoming message
NetIncomingMessage im = Program.CreateIncomingMessage(om.PeekDataBuffer(), om.LengthBits);
im.Decrypt(xtea);
if (im.ReadString() != "Hallon")
throw new NetException("fail");
if (im.ReadInt32() != 42)
throw new NetException("fail");
if (im.ReadInt32(5) != 5)
throw new NetException("fail");
if (im.ReadBoolean() != true)
throw new NetException("fail");
if (im.ReadString() != "kokos")
throw new NetException("fail");
for (int i = 0; i < 100; i++)
{
byte[] salt = NetSRP.CreateRandomSalt();
byte[] x = NetSRP.ComputePrivateKey("user", "password", salt);
byte[] v = NetSRP.ComputeServerVerifier(x);
//Console.WriteLine("v = " + NetUtility.ToHexString(v));
byte[] a = NetSRP.CreateRandomEphemeral(); // NetUtility.ToByteArray("393ed364924a71ba7258633cc4854d655ca4ec4e8ba833eceaad2511e80db2b5");
byte[] A = NetSRP.ComputeClientEphemeral(a);
//Console.WriteLine("A = " + NetUtility.ToHexString(A));
byte[] b = NetSRP.CreateRandomEphemeral(); // NetUtility.ToByteArray("cc4d87a90db91067d52e2778b802ca6f7d362490c4be294b21b4a57c71cf55a9");
byte[] B = NetSRP.ComputeServerEphemeral(b, v);
//Console.WriteLine("B = " + NetUtility.ToHexString(B));
byte[] u = NetSRP.ComputeU(A, B);
//Console.WriteLine("u = " + NetUtility.ToHexString(u));
byte[] Ss = NetSRP.ComputeServerSessionValue(A, v, u, b);
//Console.WriteLine("Ss = " + NetUtility.ToHexString(Ss));
byte[] Sc = NetSRP.ComputeClientSessionValue(B, x, u, a);
//Console.WriteLine("Sc = " + NetUtility.ToHexString(Sc));
if (Ss.Length != Sc.Length)
throw new NetException("SRP non matching lengths!");
for (int j = 0; j < Ss.Length; j++)
{
if (Ss[j] != Sc[j])
throw new NetException("SRP non matching session values!");
}
var test = NetSRP.CreateEncryption(Ss);
}
Console.WriteLine("Message encryption OK");
}
