Privacy Preserving Record Matching Among Multiple Providers

encrypt.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace FinalProject
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Socket sock;
        Thread th;
        private void BeginListen()               //Socket
        {
            IPAddress serverIp = IPAddress.Parse(tbTargetIp.Text);
            IPEndPoint iep = new IPEndPoint(serverIp, Convert.ToInt32(tbPort.Text)); 
            sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            this.lbIep.Text = iep.ToString();
            sock.Bind(iep); 
            while (true)
            {
                Byte[] byteMessage = new Byte[100];
                sock.Listen(100);             //100times
                Socket newSock = sock.Accept();
                newSock.Receive(byteMessage);
                string msg = System.Text.Encoding.UTF8.GetString(byteMessage);   //ByteToString
                rtbTalk.AppendText(msg);
            }

        }
        
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            button4.Enabled = true;
            string str_name = textBox1.Text;
            string str_ssn = textBox2.Text;
            textBox3.Text = str_name + "-" + str_ssn + "\r\n" + textBox3.Text;
        }

        public static string ToHexString(byte[] bytes)  //ByteToHexString
        {
            string hexString = string.Empty;
            if (bytes != null)
            {
                StringBuilder strB = new StringBuilder();
                for (int i = 0; i < bytes.Length; i++)
                {
                    strB.Append(bytes[i].ToString("X2"));
                }
                hexString = strB.ToString();
            }
            return hexString;
        }

        public static string Hash(string str)    //Hash Function
        {
            ASCIIEncoding enc = new ASCIIEncoding();
            SHA1 sha = new SHA1CryptoServiceProvider();
            byte[] shaHash = sha.ComputeHash(enc.GetBytes(str));
            string str_1 = ToHexString(shaHash);
            return str_1;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox4.Text = Hash(textBox3.Lines[0]);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox3.Text = "";
            textBox4.Text = "";
            rtbTalk.Text = "";
            button4.Enabled = false;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            int start = textBox3.GetFirstCharIndexFromLine(0);
            int end = textBox3.GetFirstCharIndexFromLine(1);
            textBox3.Select(start, end);
            textBox3.SelectedText = "";
            if (textBox3.Text == "")
            {
                button4.Enabled = false;
            }
        }

        private void btConnect_Click(object sender, EventArgs e)
        {
            btConnect.Enabled = false;
            btStopConnect.Enabled = true;
            btSend.Enabled = true;
            th = new Thread(new ThreadStart(BeginListen));
            th.Start();
            lbState.Text = "Listenning...";
         }

        private void btStopConnect_Click(object sender, EventArgs e)
        {
            btStopConnect.Enabled = false;
            btConnect.Enabled = true;
            btSend.Enabled = false;
            sock.Close(); 
            th.Abort();
            lbState.Text = "Listenning stopped";
        }

        private void btSend_Click(object sender, EventArgs e)
        {
            IPAddress clientIp = IPAddress.Parse(tbTargetIp.Text);
            int clientPort = Convert.ToInt32(tbPort1.Text);
            IPEndPoint clientIep = new IPEndPoint(clientIp, clientPort);
            Socket socket1 = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket1.Connect(clientIep);
            Byte[] byte_Message1;
            byte_Message1 = System.Text.Encoding.UTF8.GetBytes("-------------------------\r\n" + "The Hash value of patients' name and SSN.....\r\n" + "-------------------------\r\n");
            socket1.Send(byte_Message1);
            socket1.Shutdown(SocketShutdown.Both);
            socket1.Close();
            int count_i = 0;
            while (count_i < this.textBox3.Lines.Count() - 1)
            {
                Byte[] byte_Message;
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                socket.Connect(clientIep); 
                byte_Message = System.Text.Encoding.UTF8.GetBytes(Hash(textBox3.Lines[count_i]) + "\n");
                socket.Send(byte_Message);
                socket.Shutdown(SocketShutdown.Both);
                socket.Close();
                count_i ++;
            }
        }

        private void rtbTalk_TextChanged(object sender, EventArgs e)
        {
          
        }

        private void tbPort_TextChanged(object sender, EventArgs e)
        {

        }

        private void button5_Click(object sender, EventArgs e)
        {
            File.WriteAllText(textBox5.Text,textBox3.Text);
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox3.Text = File.ReadAllText(textBox5.Text);
            button4.Enabled = true;
        }

        private void lbIep_TextChanged(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void button7_Click(object sender, EventArgs e)
        {
            IPAddress clientIp = IPAddress.Parse(tbTargetIp.Text);
            int clientPort = Convert.ToInt32(tbPort1.Text);
            IPEndPoint clientIep = new IPEndPoint(clientIp, clientPort);
            int i = 0;  //this.textBox3.Lines.Count() - 1
            int j = 0;  //this.rtbTalk.Lines.Count() - 1
            Socket socket1 = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket1.Connect(clientIep);
            Byte[] byte_Message1;
            byte_Message1 = System.Text.Encoding.UTF8.GetBytes("------------------------------\r\n" + "Here are the common ones.....\r\n" + "------------------------------\r\n");
            socket1.Send(byte_Message1);
            socket1.Shutdown(SocketShutdown.Both);
            socket1.Close();
            byte_Message1 = System.Text.Encoding.UTF8.GetBytes(textBox3.Lines[i] + "\n");
            for (j = 0; j < this.rtbTalk.Lines.Count() - 1; j++)
            {
                for (i = 0; i < this.textBox3.Lines.Count() - 1; i++)
                {
                    if (rtbTalk.Lines[j] == Hash(textBox3.Lines[i]))
                    {
                        Byte[] byte_Message;
                        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                        socket.Connect(clientIep);
                        byte_Message = System.Text.Encoding.UTF8.GetBytes(textBox3.Lines[i] + "\n");
                        socket.Send(byte_Message);
                        socket.Shutdown(SocketShutdown.Both);
                        socket.Close();
                    }
                }
            }

        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            if (btStopConnect.Enabled == true)
            {
                sock.Close();
                th.Abort();
            }
        }

        private void button8_Click(object sender, EventArgs e)
        {
            IPHostEntry ieh = Dns.GetHostByName(Dns.GetHostName());
            rtbWords.Text = ieh.AddressList[0].ToString ();
        }
    }
}