public static void Run()
{
Core.Initialize();
RegisterOpcodes();
loginSocket = Core.StartUDPReceiver(IPAddress.Parse("127.0.0.1"), 0, OnReceive);
loginEndpoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 11000);
var random = new RNGCryptoServiceProvider();
var randoma = new byte[20];
random.GetBytes(randoma);
randoma[randoma.Length - 1] &= 0x7F;
a = new BigInteger(randoma);
PublicA = BigInteger.ModPow(g, a, N);
var PublicABytes = PublicA.ToByteArray();
UDPTransmitter transmitter = UDPTransmitter.CreateObject();
transmitter.WriteUint16((UInt16)CMSG_AUTH_LOGON_CHALLENGE); //opcode
transmitter.WriteUint16((UInt16)(9 + USERNAME.Length + PublicABytes.Length)); //packet_length
transmitter.WriteUint8(BUILD_MAJOR);
transmitter.WriteUint8(BUILD_MINOR);
transmitter.WriteUint8(BUILD_REVISION);
transmitter.WriteInt16(CLIENT_BUILD);
transmitter.WriteUint16((UInt16)USERNAME.Length);
transmitter.WriteFixedString(USERNAME);
transmitter.WriteUint16((UInt16)PublicABytes.Length);
transmitter.WriteFixedBlob(PublicABytes);
transmitter.SendTo(loginSocket, loginEndpoint);
}
private static void OnLogonChallengeOK(Session session, UDPReceiver data)
{
Console.WriteLine("[{0:yyyy-MM-dd HH\\:mm\\:ss}] [{1}:{2}] CMD_LOGON_CHALLENGE", DateTime.Now, session.RemoteEndPoint.Address, session.RemoteEndPoint.Port);
UInt16 packet_size = data.ReadUint16();
UInt16 B_bytes_length = data.ReadUint16();
byte[] B_bytes = new byte[B_bytes_length];
PublicB = new BigInteger(data.ReadFixedBlob(ref B_bytes, B_bytes_length));
UInt16 S_bytes_length = data.ReadUint16();
byte[] S_bytes = new byte[S_bytes_length];
Salt = new BigInteger(data.ReadFixedBlob(ref S_bytes, S_bytes_length));
SHA256Managed sha = new SHA256Managed();
var u = new BigInteger(sha.ComputeHash(PublicA.ToByteArray().Concat(PublicB.ToByteArray()).ToArray()).Concat(new byte[] { 0 }).ToArray());
byte[] passwordHash = sha.ComputeHash(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", USERNAME, PASSWORD.ToUpper())));
var x = new BigInteger(sha.ComputeHash(passwordHash.Concat(Salt.ToByteArray()).ToArray()).Concat(new byte[] { 0 }).ToArray());
var S = BigInteger.ModPow(PublicB - k * BigInteger.ModPow(g, x, N), (a + u * x), N);
if (S < 0)
{
S = S + N; //C# incorrectly calculates the mod of negative numbers
}
var sessionkey = sha.ComputeHash(S.ToByteArray());
var M1 = sha.ComputeHash(PublicA.ToByteArray().Concat(PublicB.ToByteArray()).Concat(sessionkey).ToArray());
using (MemoryStream ms = new MemoryStream()) {
using (BinaryWriter bw = new BinaryWriter(ms)) {
bw.Write(M1, 0, M1.Length);
}
byte[] messageBody;
messageBody = ms.ToArray();
using (MemoryStream ms1 = new MemoryStream()) {
UDPTransmitter transmitter = UDPTransmitter.CreateObject();
transmitter.WriteUint16(CMSG_AUTH_LOGON_PROOF);
transmitter.WriteUint16((UInt16)messageBody.Length);
transmitter.WriteFixedBlob(messageBody);
transmitter.SendTo(loginSocket, loginEndpoint);
}
}
}
