public void initiateSeesion() {
int public_key;
String RecText;
String SendText;
String HashText = "";
String SharedSecret = "secret";
String Ciphers = "CFB CBC PCBC RC4";
String Cipher_Chosen;
String receivedHashValue;
try {
sockIn = socket.getInputStream();
sockOut = socket.getOutputStream();
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(sockIn));
PrintWriter outToServer = new PrintWriter(sockOut, true);
InputStreamReader in = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(in);
// genrating alice random number
Random R = new Random();
RAlice = R.nextInt(100);
// sending command 1
SendText = Ciphers + ",,," + RAlice;
outToServer.println(SendText);
HashText = HashText + SendText;
System.out.println("Ciphers, RAlice :" + SendText);
// receiving command 2
RecText = inFromServer.readLine();
System.out.println("session id, my certificate, cipher, RBob: " + RecText);
HashText = HashText + RecText;
String Temp[] = RecText.split(",,,");
Session_id = Integer.parseInt(Temp[0]);
public_key = Integer.parseInt(Temp[1]);
Cipher_Chosen = Temp[2];
RBob = Integer.parseInt(Temp[3]);
// sending command3
// generating keys
key1 = MD5hash(RAlice + RBob + SharedSecret + 1);
key2 = MD5hash(RAlice + RBob + SharedSecret + 2);
System.out.println("Generated key1 : " + new String(key1));
System.out.println("Generated key2 : " + new String(key2));
// calculating hash value
String hashValue = new String(MD5hash(HashText));
System.out.println(hashValue);
// hashValue = hashValue.replaceAll("(\\r|\\n)", "");
hashValue = encHashValue(Cipher_Chosen, hashValue);
String encSharedSecret = getEncryptedSharedSecret(SharedSecret);
SendText = encSharedSecret + ",,," + hashValue;
outToServer.println(SendText);
HashText = HashText + SendText;
System.out.println("{S}bob, K{hash value} : " + SendText);
// receiving command 4
RecText = inFromServer.readLine();
// RecText = RecText.replaceAll("(\\r|\\n)", "");
System.out.println("keyed hash of msgs: " + RecText);
receivedHashValue = RecText;
receivedHashValue = decHashValue(Cipher_Chosen, receivedHashValue);
// receivedHashValue = receivedHashValue.replaceAll("(\\r|\\n)", "");
hashValue = new String(MD5hash(HashText));
// hashValue = hashValue.replaceAll("(\\r|\\n)", "");
// System.out.println("Received -- " + receivedHashValue);
// System.out.println("Caluculated -- " + hashValue);
boolean blnResult = Arrays.equals(hashValue.getBytes(), receivedHashValue.getBytes());
// System.out.println("Are two hash values equal ? : " + blnResult);
System.out.println("Hash values are comapred");
// if (blnResult) {
System.out.println("Handshake is successful");
// } else {
// System.out.println("Handshake is not successful");
// }
// file transfering
fileTransfer(Cipher_Chosen, sockIn, sockOut);
// closing stream readers/writers
System.out.println("closing streams and client socket...");
inFromServer.close();
outToServer.close();
socket.close();
} catch (Exception e) {
System.out.println("Server might not be up and running....");
}
}
public void resumeSession() {
int public_key;
String RecText;
String SendText;
String HashText = "";
String SharedSecret = "secret";
String Ciphers = "CFB CBC PCBC RC4";
String Cipher_Chosen;
String receivedHashValue;
try {
sockIn = socket.getInputStream();
sockOut = socket.getOutputStream();
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(sockIn));
PrintWriter outToServer = new PrintWriter(sockOut, true);
InputStreamReader in = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(in);
// genrating alice random number
Random R = new Random();
RAlice = R.nextInt(100);
// sending command 1
SendText = Session_id + ",,," + Ciphers + ",,," + RAlice;
outToServer.println(SendText);
HashText = HashText + SendText;
System.out.println("Session-id, Ciphers, RAlice :" + SendText);
// receiving command 2
RecText = inFromServer.readLine();
System.out.println("session id, cipher, RBob, keyed hash : " + RecText);
byte[] calHashValue = MD5hash(HashText);
HashText = HashText + RecText;
String Temp[] = RecText.split(",,,");
Session_id = Integer.parseInt(Temp[0]);
Cipher_Chosen = Temp[1];
RBob = Integer.parseInt(Temp[2]);
receivedHashValue = Temp[3];
// receivedHashValue = receivedHashValue.replaceAll("(\\r|\\n)", "");
// genreating keys
key1 = MD5hash(RAlice + RBob + SharedSecret + 1);
key2 = MD5hash(RAlice + RBob + SharedSecret + 2);
System.out.println("Generated key1 : " + new String(key1));
System.out.println("Generated key2 : " + new String(key2));
receivedHashValue = decHashValue(Cipher_Chosen, receivedHashValue);
boolean Result = Arrays.equals(receivedHashValue.getBytes(), calHashValue);
// System.out.println("Hash value comaprison : " + Result);
System.out.println("Hash values are comapred");
// sending command3
// calculating hash value
String hashValue = new String(MD5hash(HashText));
// hashValue = hashValue.replaceAll("(\\r|\\n)", "");
hashValue = encHashValue(Cipher_Chosen, hashValue);
outToServer.println(hashValue);
System.out.println("{Keyed hash of msgs} : " + hashValue);
// if (Result) {
System.out.println("Handshake is successful");
// } else {
// System.out.println("Handshake is not successful");
// }
// file transfering
fileTransfer(Cipher_Chosen, sockIn, sockOut);
// closing stream readers/writers
System.out.println("closing streams and client socket...");
inFromServer.close();
outToServer.close();
socket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
