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tickleberrie
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extra credit
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‎ExtraCredit/AES.java‎

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import javax.crypto.SecretKeyFactory;
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import javax.crypto.SecretKey;
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import javax.crypto.SealedObject;
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import javax.crypto.Cipher;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.PBEParameterSpec;
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import java.security.Security;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.*;
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import java.math.BigInteger;
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public class AES
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{
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byte[] iv = new byte[]
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{
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0x00, 0x01, 0x02, 0x03,
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0x04, 0x05, 0x06, 0x07,
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0x08, 0x09,0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f
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};
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private byte[] salt = "WENTWORTH_INSTITUTE".getBytes();
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private Cipher cipher_encr;
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private Cipher cipher_decr;
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public AES(String passphrase){
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try{
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SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
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PBEKeySpec pbeKeySpec = new PBEKeySpec(passphrase.toCharArray(), salt, 65536, 256);
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SecretKey secretKey = secretKeyFactory.generateSecret(pbeKeySpec);
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SecretKeySpec secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
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cipher_encr = Cipher.getInstance("AES/CBC/PKCS5Padding");
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cipher_encr.init(Cipher.ENCRYPT_MODE, secret , new IvParameterSpec(iv));
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cipher_decr = Cipher.getInstance("AES/CBC/PKCS5Padding");
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cipher_decr.init(Cipher.DECRYPT_MODE, secret , new IvParameterSpec(iv));
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}catch(Exception e){
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System.out.println("Error!" + e);
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System.exit(-1);
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}
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}
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/** AES encrypton
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* @param data Object to Encrypt
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* @return an encrypted Object
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*/
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public SealedObject encrypt(Serializable data)
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throws Exception{
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return new SealedObject(data, cipher_encr);
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}
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/**
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* - AES decrypton
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* @param sealedObj Encrypted Object
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* @return an Serializable Object
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*/
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public Serializable decrypt(SealedObject sealedObj)
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throws Exception{
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return (Serializable)sealedObj.getObject(cipher_decr);
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}
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}

‎ExtraCredit/Client.java‎

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import java.lang.*;
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import java.io.*;
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import java.net.*;
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import java.util.Scanner;
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import javax.crypto.*;
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import javax.crypto.spec.*;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.nio.charset.StandardCharsets;
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class Client {
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public static void main(String args[]) {
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try {
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Socket s = new Socket("localhost", 1234);
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System.out.println("Local Port: " + s.getLocalPort());
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System.out.println("Server Port: " + s.getPort());
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ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());
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ObjectInputStream ois = new ObjectInputStream(s.getInputStream());
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BigInteger q = (BigInteger) ois.readObject();
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System.out.println("Client: Recived modulus (q). ");
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BigInteger a = (BigInteger) ois.readObject();
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System.out.println("Client: Recived prime root (a). ");
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System.out.println("Client: Computing public key (Ya)...");
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DiffieHellman dh = new DiffieHellman();
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BigInteger y = dh.computePublicKey(q,a);
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oos.writeObject(y);
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System.out.println("Client: Sending my Ya...");
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System.out.println("Client: Waiting for Server's public key (Yb)...");
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BigInteger yb = (BigInteger)ois.readObject();
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System.out.println("Client: Recieved Yb.");
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BigInteger mkey = dh.computeMasterKey(yb,q);
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System.out.println("Client: Creating symmetric Key...");
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String keyHash = DiffieHellman.createHashString(mkey);
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System.out.println("Client: Symmetric Key Created. \n");
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System.out.println("Hash:" + keyHash);
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System.out.println("--------- Secured Communication Initialized -----------");
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Scanner scanner = new Scanner(System.in);
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//AES aes = new AES(keyHash);
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MListener ml = new MListener(ois, oos, keyHash);
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ml.setDaemon(false);
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ml.start();
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while (scanner.hasNext()){
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String message = scanner.nextLine();
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INFO info = new INFO("Rixing", message);
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// SealedObject sb = aes.encrypt(info);s
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// oos.writeObject(sb);
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ml.sendMessage(info);
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}
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// /*
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// * (1) RECEIVE a BigInteger
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// */
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// BigInteger bi = (BigInteger) ois.readObject();
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// System.out.println("Server sent to me: " + bi);
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//
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// /*
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// * (2) SEND a BigInteger
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// */
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// oos.writeObject(bi.add(BigInteger.ONE));
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//
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//
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// /*
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// * (3) RECEIVE a custom object, which is Serializable
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// */
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// INFO info = (INFO) ois.readObject();
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// System.out.println("INFO object sent by server: " );
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// info.printInfo();
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// for(int i=0; i < info.getArray().length; i++) {
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// System.out.println("\t["+ i + "] " + info.getArray()[i]);
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// }
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//
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//
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// /*
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// * (4) RECEIVE a String
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// */
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// System.out.println("Server says: " + (String) ois.readObject());
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//
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//
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//
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// System.out.println("--------- ENCRYPTED SEND/RECEIVE -----------");
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//
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//
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//
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//
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// /*
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// * Create Key
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// */
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// String password = "12345678";
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// byte key[] = password.getBytes();
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// DESKeySpec desKeySpec = new DESKeySpec(key);
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// SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
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// SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
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//
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//
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// /*
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// * Create Cipher
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// */
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// Cipher desCipher_encr = Cipher.getInstance("DES/ECB/PKCS5Padding");
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// Cipher desCipher_decr = Cipher.getInstance("DES/ECB/PKCS5Padding");
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//
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//
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// /*
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// * Initialize Cipher
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// */
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// desCipher_encr.init(Cipher.ENCRYPT_MODE, secretKey);
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// desCipher_decr.init(Cipher.DECRYPT_MODE, secretKey);
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//
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//
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//
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// /*
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// * RECEIVE a String (encrypted)
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// */
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// SealedObject sobj = (SealedObject) ois.readObject();
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// String ss = (String) sobj.getObject(desCipher_decr);
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// System.out.println("Server sent String: " + ss);
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//
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// System.out.println("--------- Secured Communication Initialized -----------");
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// /*
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// * SEND a custom object (encrypted)
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// */
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// INFO info_en = new INFO("CLIENT", new BigInteger("999999999"));
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// SealedObject info_sealed_obj = new SealedObject(info_en, desCipher_encr);
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// oos.writeObject(info_sealed_obj);
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//
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// /*
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// * RECEIVE IMAGE
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// */
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// SealedObject si = (SealedObject) ois.readObject();
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// System.out.println("(1)");
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// IMAGE_OBJ iobj = (IMAGE_OBJ) si.getObject(desCipher_decr);
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// System.out.println("(2) ");
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// iobj.SaveImage("./IMAGE_RECEIVED.png");
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// System.out.println("(3)");
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// close streams
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oos.close();
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ois.close();
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/*
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* Close connection
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*/
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s.close();
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}
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catch(Exception e) {
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System.err.print("[ERROR] ::" + e);
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}
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}
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}

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