private static void TestMac(int suffix)
{
var start = DateTime.Now;
Interlocked.Increment(ref _current);
using (var tcp = new TcpClient(AddressFamily.InterNetworkV6))
{
tcp.Connect(_omm, 16321);
var socket = tcp.Client;
socket.ReceiveTimeout = 10000;
var auth = new byte[0x24];
var init = _init.AsSpan().ToArray();
BinaryPrimitives.WriteInt32LittleEndian(init.AsSpan(0xf), suffix);
socket.Receive(auth, SocketFlags.None, out var error);
if (error == SocketError.TimedOut)
{
Console.WriteLine($"Timeout for MAC 003042{HexEncoding.ByteToHex(init.AsSpan(0xf,3))}");
return;
}
var sysAuth = auth.AsSpan(4);
using (var md5 = MD5.Create())
{
var data = new byte[sysAuth.Length + init.Length - 0x10 + _signatureKey.Length];
sysAuth.CopyTo(data);
init.CopyTo(data.AsSpan(sysAuth.Length));
_signatureKey.CopyTo(data.AsMemory(sysAuth.Length + init.Length - 0x10));
var hash = md5.ComputeHash(data);
hash.AsSpan().CopyTo(init.AsSpan(0x104));
}
socket.Send(init);
var ack = new byte[8];
var read = socket.Receive(ack);
if (read != 0)
{
Console.WriteLine($"Found valid MAC 003042{HexEncoding.ByteToHex(init.AsSpan(0xf,3))}");
Console.WriteLine($"Took {DateTime.Now.Subtract(start).TotalMilliseconds}ms");
}
}
}