Crypted file is not working - c#

I started to learn about cryptography and I wanted to make my own file crypter.
After you run the program you must select file to encrypt and then stub. For now it is now encrypting but it is binding two files. After selecting this two files it will create file first.exe. Splitter string is for program to know where stub code ends and when original file code starts. It is made like this
stub
splitter (some string)
original file
When you run first.exe then it will create file cos.exe which should be the original file. But when i run it, it doesnt work. It shows "This app is not going to work on your computer" and it says that i need to find version for my OS.
Here is the code for crypter:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string stubpath, filepath;
private void Form1_Load(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog(this) == DialogResult.OK)
{
filepath = openFileDialog1.InitialDirectory + openFileDialog1.FileName;
}
if (openFileDialog1.ShowDialog(this) == DialogResult.OK)
{
stubpath = openFileDialog1.InitialDirectory + openFileDialog1.FileName;
}
byte[] originalfile = File.ReadAllBytes(filepath);
byte[] array = Encoding.ASCII.GetBytes("password");
byte[] originalstubfile = File.ReadAllBytes(stubpath);
byte[] arr1 = Combine(array, originalfile);
ByteArrayToFile("first.exe", Combine(originalstubfile,arr1));
}
public bool ByteArrayToFile(string fileName, byte[] byteArray)
{
try
{
using (var fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
fs.Write(byteArray, 0, byteArray.Length);
return true;
}
}
catch (Exception ex)
{
return false;
}
}
public static byte[] Combine(byte[] first, byte[] second)
{
byte[] ret = new byte[first.Length + second.Length];
Buffer.BlockCopy(first, 0, ret, 0, first.Length);
Buffer.BlockCopy(second, 0, ret, first.Length, second.Length);
return ret;
}
}
}
And here is the code for stub:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string exePath = Application.ExecutablePath;
byte[] originalfile = File.ReadAllBytes(exePath);
var str = System.Text.Encoding.Default.GetString(originalfile);
string[] tokens = str.Split(new[] { "password" }, StringSplitOptions.None);
//0 stub
//1 original file
byte[] toBytes = Encoding.ASCII.GetBytes(tokens[1]);
File.WriteAllBytes(System.AppDomain.CurrentDomain.BaseDirectory+ "cos.exe", toBytes);
}
}
}
EDIT:
Here is the error(Polish Language)
Also I found that when I delete splitter string and I dont use stub but I use 2 files like ex. putty.exe then it works, so I think that there is a problem in the stub.

Related

vlc restream http audio to rtsp audio

I'd like to restream the input http audio stream to as an rtsp stream from my local laptop. But for some reason the port wouldnt open on localhost. This is how I'm trying to do this:
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
namespace VLC_test
{
class Program
{
static bool Terminate;
static bool Terminated;
static void Main(string[] args)
{
Thread t = new Thread(PlayMedia);
t.Start();
Console.ReadKey();
Terminate = true;
while (!Terminated) ;
}
static void PlayMedia()
{
Terminated = false;
FileInfo file = new FileInfo(#"C:\audio.mkv");
string httpStream = "http://10.254.255.10:8080/audio";
var libDirectory = new DirectoryInfo(#"C:\Program Files (x86)\VideoLAN\VLC\");
using (var mediaPlayer = new Vlc.DotNet.Core.VlcMediaPlayer(libDirectory))
{
var mediaOptions = new[]
{
":sout-avcodec-strict=-2",
":sout=#transcode{vcodec=none,acodec=mp4a,,ab=128,channels=2,samplerate=16000,scodec=none} :rtp{dst=127.0.0.1,port=5554,sdp=rtsp://127.0.0.1:5554/live}"
};
mediaPlayer.SetMedia(httpStream, mediaOptions);
mediaPlayer.Play(httpStream, mediaOptions);
while(!Terminate)
{
Thread.Sleep(10);
}
Terminated = true;
}
}
}
}
I would like my test laptop act as an RTSP server, but I cannot plugin as an argument "avcodec-strict=-2"

System.InvalidOperationException: 'The operation is not allowed on non-connected sockets.'

This is my form
https://i.stack.imgur.com/M7fuy.png
This is my code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Sockets;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
System.Net.Sockets.TcpClient clientSocket = new
System.Net.Sockets.TcpClient();
//NetworkStream serverStream = default(NetworkStream);
//string readData = null;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
msg("Client Started");
clientSocket.Connect("192.168.0.167", 5000);
label1.Text = "Client Socket Program - Server Connected ...";
}
private void button1_Click(object sender, EventArgs e)
{
NetworkStream serverStream = clientSocket.GetStream();
byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textBox2.Text + "$");
serverStream.Write(outStream, 0, outStream.Length);
serverStream.Flush();
byte[] inStream = new byte[10025];
serverStream.Read(inStream, 0, (int)clientSocket.ReceiveBufferSize);
string returndata = System.Text.Encoding.ASCII.GetString(inStream);
msg(returndata);
textBox2.Text = "";
textBox2.Focus();
}
public void msg(string mesg)
{
textBox1.Text = textBox1.Text + Environment.NewLine + " >> " + mesg;
}
}
}
when I click the start button in the code i am getting this error to connect to the server. please guide me how to get rid of this error and connect to the server instead.
https://i.stack.imgur.com/wDSCI.png

Sending and receiving an image over sockets with C# | Screen Sharing Using C#

I am trying to set up two programs in C#. Basically, a simple server side set up where I want the client to listen for an image from the Server. Then, upon receiving the image, will display it in a PictureBox.
**I keep running into the following error:
A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll or Parameter is not Valid**
SERVER SIDE
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ServerComputer
{
public partial class mainForm : Form
{
public mainForm()
{
InitializeComponent();
}
Socket sendsocket;
private void goLive_Click(object sender, EventArgs e)
{
try
{
sendsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//The instantiation of socket, IP for 192.168.1.106, 10001 for Port
IPEndPoint ipendpiont = new IPEndPoint(IPAddress.Parse(ipAddress.Text.Trim()), 10001);
sendsocket.Connect(ipendpiont);
//Establishment of end point
Thread th = new Thread(new ThreadStart(threadimage));
th.IsBackground = true;
th.Start();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return;
}
this.Hide(); //Hidden form
}
private Bitmap GetScreen()
{
Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g = Graphics.FromImage(bitmap);
g.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
return bitmap;
}
private void threadimage()
{
try
{
while (true)
{
MemoryStream ms = new MemoryStream();
GetScreen().Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); //Here I use the BMP format
byte[] b = ms.ToArray();
sendsocket.Send(b);
Thread.Sleep(67); //I'm here to set to send a second
}
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
return;
}
}
}
}
CLIENT SIDE
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ClientComputer
{
public partial class mainForm : Form
{
public mainForm()
{
InitializeComponent();
}
Socket hostSocket;
Thread thread;
string localIP = string.Empty;
string computrHostName = string.Empty;
private void mainForm_Load(object sender, EventArgs e)
{
computrHostName = Dns.GetHostName();
IPHostEntry hostname = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in hostname.AddressList)
{
if (ip.AddressFamily.ToString() == "InterNetwork")
{
localIP = ip.ToString();
}
}
}
private void liveScreen_Click(object sender, EventArgs e)
{
Socket receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint hostIpEndPoint = new IPEndPoint(IPAddress.Parse(localIP), 10001);
//Connection node
receiveSocket.Bind(hostIpEndPoint);
receiveSocket.Listen(10);
MessageBox.Show("start");
hostSocket = receiveSocket.Accept();
thread = new Thread(trreadimage);
thread.Start();
thread.IsBackground = true;
}
private void trreadimage()
{
int dataSize, i = 0;
try
{
while (true)
{
i++;
byte[] b = new byte[1024 * 1024 * 20]; //Picture of great
dataSize = hostSocket.Receive(b,0,b.Length,SocketFlags.None);
MemoryStream ms = new MemoryStream(b,0,dataSize,true);
//bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Image img = Image.FromStream(ms);
img.Save("Image"+i+".Jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);
videoBox.Image = img;
Console.WriteLine("Image Size: " + dataSize);
}
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
thread.Abort();
}
}
}
}

I can't stop repeating: never ever send raw data to a socket and expect to receive them the same way on another end. Use a protocol instead, to describe your network activity. In simplest case, send DWORD first that designated total length of your image. Same time, it's worth to reuse existing protocols like HTTP or what can fit your needs.
Why to bother? Well, if your "network" is just a piece of wire with two jacks on ends that placed directly into network cards of your PCs, that maybe happen to work OK (and still no 100% warranty). In real case, your "network connection" is a pack of inter-connections between routers, firewalls, switches and all that sort of hidden machinery in-between. They can (and will!) re-shape your stream the way they find useful for them. So, on the other end, how can your counterparty understand: is there everything received? how many packets to expect? etc. etc. etc.
So, sending some business data directly to socket is the same efficient as yelling to the window if you plan to say something to your friend living nearby. And, usually we use a phone with that kind of communication protocol "hey, Peter?.. yes, it's me.. listen, take care about your car as hail shower is coming... Bye!". See the difference?

Following code is working now, and I have few suggestions,
Try Async methods/events to receive and send data through socket instead of using loop or recursive methods.
Server Code.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ServerComputer
{
publicpartialclassmainForm : Form
{
public mainForm()
{
InitializeComponent();
}
Socket sendsocket;
privatevoid goLive_Click(object sender, EventArgs e)
{
try
{
sendsocket = newSocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//The instantiation of socket, IP for 192.168.1.106, 10001 for PortIPEndPoint ipendpiont = newIPEndPoint(IPAddress.Parse(ipAddress.Text.Trim()), 10001);
sendsocket.Connect(ipendpiont);
//Establishment of end pointThread th = newThread(newThreadStart(threadimage));
th.IsBackground = true;
th.Start();
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
return;
}
this.Hide(); //Hidden form
}
privateBitmap GetScreen()
{
Bitmap bitmap = newBitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
Graphics g = Graphics.FromImage(bitmap);
g.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
return bitmap;
}
privatevoid threadimage()
{
try
{
MemoryStream ms = newMemoryStream();
GetScreen().Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); //Here I use the BMP formatbyte[] b = ms.ToArray();
sendsocket.Send(b);
ms.Close();
}
catch (Exception ee)
{
// MessageBox.Show(ee.Message);//return;
}
Thread.Sleep(1000);
threadimage();
}
}
}
Clint Code.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ClientComputer
{
public partial class mainForm : Form
{
public mainForm()
{
InitializeComponent();
}
Socket hostSocket;
Thread thread;
string localIP = string.Empty;
string computrHostName = string.Empty;
private void mainForm_Load(object sender, EventArgs e)
{
computrHostName = Dns.GetHostName();
IPHostEntry hostname = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in hostname.AddressList)
{
if (ip.AddressFamily.ToString() == "InterNetwork")
{
localIP = ip.ToString();
}
}
this.Text = this.Text + " | " + localIP;
}
private void liveScreen_Click(object sender, EventArgs e)
{
connectSocket();
}
private void connectSocket()
{
Socket receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint hostIpEndPoint = new IPEndPoint(IPAddress.Parse(localIP), 10001);
//Connection node
receiveSocket.Bind(hostIpEndPoint);
receiveSocket.Listen(10);
MessageBox.Show("start");
hostSocket = receiveSocket.Accept();
thread = new Thread(new ThreadStart(trreadimage));
thread.IsBackground = true;
thread.Start();
}
private void trreadimage()
{
int dataSize;
string imageName = "Image-" + System.DateTime.Now.Ticks + ".JPG";
try
{
dataSize = 0;
byte[] b = new byte[1024 * 10000]; //Picture of great
dataSize = hostSocket.Receive(b);
if (dataSize > 0)
{
MemoryStream ms = new MemoryStream(b);
Image img = Image.FromStream(ms);
img.Save(imageName, System.Drawing.Imaging.ImageFormat.Jpeg);
videoBox.Image = img;
ms.Close();
}
}
catch (Exception ee)
{
//MessageBox.Show(ee.Message);
//thread.Abort();
}
System.Threading.Thread.Sleep(1500);
trreadimage();
}
}
}

MemoryStream ms = new MemoryStream(b);
Image img = Image.FromStream(ms);
img.Save(imageName, System.Drawing.Imaging.ImageFormat.Jpeg);
videoBox.Image = img;
The error may due to corrupted or incomplete bmp image received in the MemoryStream it worked fine for me after increasing the socket send/receive buffers values
so adjust the sender "Socket.SendBufferSize" and the receiver "Socket.ReceiveBufferSize" to large values for example SendBufferSize = 1024 * 1024 * 20
this will help sending the entire image at once.
or another solution is to check whether the received data size (b.length) is the same as the sent image data size, before the code line of forming the received image stream

Socket Sending and Recieving in C# (while loop)

Here is my code. I am codding a simple Socket test.
using System;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.IO;
using System.Text;
using Microsoft.Win32;
namespace HelloWorld
{
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Connexion au serveur 62.210.130.212");
using (client = new TcpClient("62.210.130.212", 35025))
using (NetworkStream networkStream = client.GetStream())
{
byte[] usernameBytes = Encoding.ASCII.GetBytes(username);
networkStream.Write(usernameBytes, 0, usernameBytes.Length);
}
while (true)
{
Byte[] data = new Byte[256];
Int32 bytes = networkStream.Read(data, 0, data.Length);
String responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.WriteLine("recieved: " + responseData);
}
}
}
}
Now the problem is that i can't use the networkStram anymore in my code because it has been deleted on the end of the using tab.
Can someone help me with that problem, I am new to C#, this doesn't exist in Java.
Thank you!
Julien.

You simply have to extend the using over all usages of the object you're using - this makes sense, if you just look at the word: All the code inside the curled brackets is using the object inside the brackets. So this should at least solve that specific problem:
using System;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using System.IO;
using System.Text;
using Microsoft.Win32;
namespace HelloWorld
{
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Connexion au serveur 62.210.130.212");
using (client = new TcpClient("62.210.130.212", 35025))
using (NetworkStream networkStream = client.GetStream())
{
byte[] usernameBytes = Encoding.ASCII.GetBytes(username);
networkStream.Write(usernameBytes, 0, usernameBytes.Length);
while (true)
{
Byte[] data = new Byte[256];
Int32 bytes = networkStream.Read(data, 0, data.Length);
String responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.WriteLine("recieved: " + responseData);
}
}
}
}
}

File creation of specific length in c#

I am trying to create a new file with a specific length.
By using below code, the file gets created.
The problem is the length of the file created is 0kb's.
Also, the text under stream writer is not written in the file.
using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
namespace Filesize
{
class Program
{
static void Main(string[] args)
{
FileInfo fi = new FileInfo(#"D:\\demotext2.txt");
StreamWriter sw = new StreamWriter(#"D:\\demotext2.txt", true);
try
{
while (fi.Length >= (2 * 1024 * 1024))
{
sw.WriteLine("Demo File");
}
}
catch (Exception ex)
{
ex.ToString();
}
}
}
}

Try to use this:
http://msdn.microsoft.com/en-us/library/system.io.filestream.setlength.aspx
using (var fs = new FileStream(strCombined, FileMode.Create, FileAccess.Write, FileShare.None))
{
fs.SetLength(oFileInfo.FileSize);
}

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