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Client.java
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Client.java
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import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Scanner;
import javax.crypto.Cipher;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
/**
* @author Greeshma Reddy
*
*/
public class Client {
Socket clientSocket = null;
String serverIP;
int serverPort;
File content;
PublicKey PUBK;
PrivateKey PRIK;
byte[] message1, message2;
public Client(String serverIP, int serverPort, File content, PublicKey PUBK, PrivateKey PRIK)
{
this.serverIP = serverIP;
this.serverPort = serverPort;
this.content = content;
this.PUBK=PUBK;
this.PRIK=PRIK;
}
public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchProviderException, IOException
{
KeyPairGeneration keypairs= new KeyPairGeneration();
keypairs.generateKeyPairClient();
PublicKey PUBK = keypairs.loadPublicKey(new File("./clientpublic.txt"));
PrivateKey PRIK= keypairs.loadPrivateKey(new File("./clientprivate.txt"));
Scanner s= new Scanner(System.in);
System.out.println("Enter server IP");
String serverIP=s.next();
System.out.println("Enter the server's port");
int serverport=s.nextInt();
System.out.println("Enter text file path");
String content=s.next();
Client client=new Client(serverIP, serverport, new File(content), PUBK, PRIK);
client.clientProcess();
s.close();
}
/**
* Client method responsible for sharing keys and random numbers. Sends the file content to server
*/
void clientProcess()
{
try {
clientSocket = new Socket();
SocketAddress SA= new InetSocketAddress("localhost", 4555);
clientSocket.bind(SA);
clientSocket.connect(new InetSocketAddress(serverIP, serverPort));
System.out.println("client started on"+ clientSocket.getLocalPort());
BufferedReader br= new BufferedReader(new FileReader(content));
char[] buf= new char[32];
int length;
ArrayList<byte[]> Fi= new ArrayList<byte[]>();
while((length=br.read(buf))!=-1)
{
// Fi.add(Charset.forName("UTF-8").encode(CharBuffer.wrap(buf)).array());
Fi.add(new String(buf).getBytes("UTF-8"));
}
System.out.println("There are "+Fi.size()+" blocks");
byte[] randomkey=BigInteger.valueOf(new SecureRandom().nextLong()).toByteArray();
randomkey = Arrays.copyOf(randomkey, 16);
SecretKeySpec key_AES = new SecretKeySpec(randomkey, "AES");
Cipher aesCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
LinkedHashMap<byte[], byte[]> hm= new LinkedHashMap<byte[], byte[]>();
ArrayList<byte[]> Mac= new ArrayList<byte[]>();
for(byte[] i:Fi)
{
aesCipher.init(Cipher.ENCRYPT_MODE, key_AES);
byte[] temp= aesCipher.doFinal(i);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, PRIK);
byte[] Hi=cipher.doFinal(temp);
hm.put(i,Hi);
Mac.add(calculateMac(randomkey,Hi));
}
OutputStream os = clientSocket.getOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(key_AES);
oos.writeObject(PUBK);
oos.writeObject(hm);
oos.reset();
System.out.println("Data outsourced to the server");
Scanner s= new Scanner(System.in);
ObjectInputStream ois = new ObjectInputStream(clientSocket.getInputStream());
while(true)
{
System.out.println("Enter the command: Check i or Retrieve i");
String str=s.nextLine();
String[] command= str.split("\\s");
oos.writeObject(Integer.parseInt(command[1]));
oos.writeObject(command[0].getBytes());
System.out.println("sent command");
if(command[0].equalsIgnoreCase("check"))
{
message1= (byte[])ois.readObject();
if(Arrays.equals(Mac.get(Integer.parseInt(command[1])), calculateMac(randomkey, message1)))
{
System.out.println("Success");
}
else
{
System.out.println("Failure");
}
}
else if(command[0].equalsIgnoreCase("retrieve"))
{
// InputStream is = clientSocket.getInputStream();
// ObjectInputStream ois = new ObjectInputStream(is);
message2= (byte[])ois.readObject();
String result= new String(message2);
System.out.println(result);
}
else
{
System.out.println("Invalid command..");
}
}
// clientSocket.close();
} catch (Exception e) {
System.out.println("Error occured"+ e.getMessage());
e.printStackTrace();
}
}
private byte[] calculateMac(byte[] aESKey, byte[] content) throws NoSuchAlgorithmException, InvalidKeyException {
Mac hMAC = Mac.getInstance("HmacSHA256");
final SecretKeySpec key = new SecretKeySpec(aESKey, "HmacSHA256");
hMAC.init(key);
return hMAC.doFinal(content);
}
}