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Base_Connection.cs
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Base_Connection.cs
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using System.Net.Sockets;
using ftw_msgr.Crypto;
namespace ftw_msgr.Connection;
public class Base_Connection
{
protected TcpClient? socket;
protected NetworkStream? netStream;
protected BinaryReader? reader;
protected BinaryWriter? writer;
protected List<string> messages = new List<string>();
protected bool handleStarted;
protected PQCrypt myCrypt = new PQCrypt();
public List<string> MsgHistory => messages;
// used by the server to move their public key to the client
protected void SendKey()
{
if (myCrypt.pubParams is not null)
{
SendMsg<string>("KYBER_PUB_KEY", false);
SendMsg<int>(myCrypt.pubParams.GetEncoded().Length, false);
SendMsg<byte[]>(myCrypt.pubParams.GetEncoded(), false);
}
else
{
Console.WriteLine("Public key not available.");
}
}
protected void SendCipher()
{
if (myCrypt.encoded_cipher_text is not null)
{
SendMsg<string>("KYBER_CIPHER", false);
SendMsg<string>(myCrypt.encoded_cipher_text, false);
}
else
{
Console.WriteLine("Public key is not available to create cipher.");
}
}
public void SendMsg<T>(T msg, bool encrypt = true)
{
while (!handleStarted)
{
continue;
}
if (writer is null || msg is null)
{
Console.WriteLine("writer not initialized.");
}
else
{
Type myType = typeof(T);
switch (myType)
{
case Type when myType == typeof(byte[]):
byte[]? myBytes = msg as byte[];
if (myBytes is null) { myBytes = Array.Empty<byte>(); }
char[]? myChars = new char[myBytes.Length * 2];
if (encrypt)
{
Convert.ToBase64CharArray(myBytes, 0, myBytes.Length, myChars, 0);
myChars = myCrypt.EncryptMessage<char[]>(myChars);
myBytes = myChars is null ?
Array.Empty<byte>()
: Convert.FromBase64CharArray(myChars, 0, myChars.Length);
}
writer.Write(myBytes);
break;
case Type when myType == typeof(int):
int myInt = 0;
if (msg is not null)
{
myInt = Convert.ToInt32(msg);
}
writer.Write(myInt);
break;
case Type _ when myType == typeof(string):
string? myStr = msg as string;
if (myStr is null) { myStr = ""; }
if (encrypt)
{
myStr = myCrypt.EncryptMessage<string>(myStr);
if (myStr is null)
{
myStr = "";
}
}
writer.Write(myStr);
if (msg as string == "exit") { socket?.Close(); }
break;
default:
break;
}
}
}
protected void InitComs()
{
if (socket is not null)
{
netStream = socket.GetStream();
reader = new BinaryReader(netStream);
writer = new BinaryWriter(netStream);
Task.Run(() => HandleRequest());
}
else
{
Console.WriteLine("Socket not initialized.");
}
}
protected void HandleRequest()
{
handleStarted = true;
while (socket is not null && socket.Connected && reader is not null)
{
var cmd = reader.ReadString();
if (cmd is not null)
{
int byteCount;
switch (cmd)
{
case "exit":
socket.Close();
break;
case "KYBER_PUB_KEY":
byteCount = reader.ReadInt32();
byte[]? myKey = reader.ReadBytes(byteCount);
myCrypt.InitRemotePublicKey(myKey);
SendCipher();
break;
case "KYBER_CIPHER":
myCrypt.generated_cipher_text = Convert.FromBase64String(reader.ReadString());
myCrypt.InitRemoteSecret();
break;
default:
cmd = myCrypt.DecryptMessage(cmd);
messages.Add(string.Format($"Received: {cmd}"));
break;
}
}
Console.Clear();
foreach (string msg in messages)
{
Console.WriteLine(msg);
}
Console.Write("Send: ");
}
}
}