v0

Q2.java

@@ -0,0 +1,39 @@
+public class Q2 {
+
+//Setup_Request: Hello
+
+//SETUP: Server's RSA public key
+
+//Client_Hello:IDc
+
+//Server_Hello: IDs , SID
+
+//Ephemeral DH exchange
+
+//Finished, check the shared key
+
+//Data exchange
+
+/**
+ * Opens the client and server in seperate terminals
+ * @param args
+ */
+public static void main(String[] args)
+{
+    // try
+    // { 
+    //  Runtime.getRuntime().exec("cmd /c start cmd.exe /K \"java Q2Server\"");
+    //  Thread.sleep(500); //Just to ensure the server has enough time to open
+    //  Runtime.getRuntime().exec("cmd /c start cmd.exe /K \"java Q2Client\"");
+    // }
+    // catch (Exception e)
+    // {
+    //     e.printStackTrace();
+    // }
+
+    Q2Tools toolbox = new Q2Tools();
+
+    toolbox.fastModularExpon(5, 117, 19);
+}
+
+}

Q2Client.java

@@ -0,0 +1,37 @@
+import java.net.Socket;
+import java.io.*;  
+
+public class Q2Client {
+    
+    private Socket s;
+    
+    public static void main(String[] args)
+    {
+        System.out.println("Runing Client");
+        Q2Client client = new Q2Client();   
+        client.run();
+    }
+
+    public void run()
+    {
+        try 
+        {
+            s = new Socket("localhost", 4321);
+            
+            DataOutputStream dout=new DataOutputStream(s.getOutputStream());  
+            dout.writeUTF("Hello"); //Setup_Request
+            //dout.flush();  
+            
+            
+            
+            
+            dout.close();  
+            
+            s.close();  
+        } 
+        catch (Exception e) 
+        {
+            System.out.println("Client Socket failed to connect.");
+        }
+    }
+}

Q2Server.java

@@ -0,0 +1,39 @@
+import java.net.ServerSocket;
+import java.net.Socket;
+
+import java.io.*;  
+
+public class Q2Server {
+    
+    private ServerSocket ss;
+    private Socket s;
+    
+    public static void main(String[] args)
+    {
+        System.out.println("Runing Server");
+        Q2Server server = new Q2Server();
+        server.run();
+    }
+    public void run()
+    {
+        try 
+        {
+            ss = new ServerSocket(4321);
+            s = ss.accept();
+
+            DataInputStream dis=new DataInputStream(s.getInputStream());  
+            String  str=(String)dis.readUTF();  
+            System.out.println("message= "+str);  
+            
+            ss.close();              
+        } 
+        catch (Exception e) 
+        {
+            System.out.println("Server Failed");
+            System.out.println(e);
+        }
+    }
+
+    
+
+}

Q2Tools.java

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+import java.math.BigInteger;
+
+public class Q2Tools {
+
+    Q2Tools()
+    {
+        //Nothing to do here
+    }
+    
+    public void generateRSA()
+    {
+
+        int e = 65537;
+
+        //Generate p
+
+        //Generate q
+
+
+
+    }
+
+    /**
+     * A^B mod C
+     * @param A
+     * @param B
+     * @param C
+     */
+    public void fastModularExpon(int A, int B, int C)
+    {
+        String bInBinary = Integer.toBinaryString(B);
+
+        int test = 0;
+
+        System.out.println(bInBinary);
+
+        int k = 0;
+        for(int i = bInBinary.length()-1; i >= 0; i--)
+        {
+            
+            if(bInBinary.charAt(i)=='1')
+            {
+                double temp = Math.pow(2, k);
+                System.out.println(2+"^"+k+"="+temp);
+                test += temp;
+            }
+            else
+            {
+                System.out.println(0+"^"+k+"=0"); 
+            }
+            k++;
+        }
+        
+        System.out.println(test);
+    }
+
+    /**
+     * Simply wrapper for Integer.toBinaryString
+     * @param number integer to be converted to binary
+     * @return binary of number as an Biginteger
+     */
+    public BigInteger convertToBinaryBigInt(int number)
+    {
+        //Take input number, convert to binary string
+        String binaryString = Integer.toBinaryString(number);
+        BigInteger bigBinary = new BigInteger(binaryString);
+        return bigBinary;
+    }
+
+}