YbdxtAht

1import java.io.DataInputStream;
2import java.io.DataOutputStream;
3import java.io.IOException;
4import java.net.Socket;
5import java.net.UnknownHostException;
6import java.security.NoSuchAlgorithmException;
7import java.security.SecureRandom;
8import java.util.Base64;
9
10import javax.crypto.*;
11import javax.crypto.spec.IvParameterSpec;
12import javax.crypto.spec.SecretKeySpec;
13public class AES {
14 public final static String SERVER="127.0.0.1";
15 public static final int PORT=8088;
16 
17 public static void main(String[] args) throws NoSuchAlgorithmException {
18	 
19	 String plainText="Vaibhav Navnath Kumbhar";
20	try {
21		Socket soc=new Socket(SERVER, PORT);
22		 System.out.println("Just connected to " + soc.getRemoteSocketAddress());
23		 
24		 DataOutputStream out=new DataOutputStream(soc.getOutputStream());
25		 DataInputStream in=new DataInputStream(soc.getInputStream());
26		 //GENERATING KEYS
27		 KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");
28		 keyGenerator.init(128);
29		 
30		 SecretKey key=keyGenerator.generateKey();
31		 
32		 // Generating IV.(INitializaion vector)/We are using CBC
33	     byte[] IV = new byte[16];
34	     SecureRandom random = new SecureRandom();
35	     random.nextBytes(IV);
36	     
37	        byte[] cipherText = encrypt(plainText.getBytes(),key, IV);
38		System.out.println("Plain Text: :"+plainText);
39	        System.out.println("Encrypted Text : "+Base64.getEncoder().encodeToString(cipherText) );
40	        String cipherString=Base64.getEncoder().encodeToString(cipherText);
41	        System.out.println("Symmetric Key "+Base64.getEncoder().encodeToString(key.getEncoded()));
42	        out.writeUTF(Base64.getEncoder().encodeToString(key.getEncoded())); //key
43	        out.write(IV);
44	        out.writeUTF(cipherString);
45	        
46		
47		
48	} catch (UnknownHostException e) {
49		e.printStackTrace();
50	} catch (IOException e) {
51		e.printStackTrace();
52	} catch (Exception e) {
53		// TODO Auto-generated catch block
54		e.printStackTrace();
55	}
56}
57 
58 
59 public static byte[] encrypt(byte[] plaintext, SecretKey key, byte[] IV) throws Exception{
60
61     //Get Cipher Instance
62     Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
63     
64     //Create SecretKeySpec
65     SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");
66     
67     //Create IvParameterSpec
68     IvParameterSpec ivSpec = new IvParameterSpec(IV);
69     
70     //Initialize Cipher for ENCRYPT_MODE
71     cipher.init(Cipher.ENCRYPT_MODE, keySpec,ivSpec 	);
72     
73     //Perform Encryption
74     byte[] cipherText = cipher.doFinal(plaintext);
75     
76     return cipherText;
77	 
78 }
79 
80 public static String decrypt (byte[] cipherText, SecretKey key,byte[] IV) throws Exception
81 {
82     //Get Cipher Instance
83     Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
84     
85     //Create SecretKeySpec
86     SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");
87     
88     //Create IvParameterSpec
89     IvParameterSpec ivSpec = new IvParameterSpec(IV);
90     
91     //Initialize Cipher for DECRYPT_MODE
92     cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
93     
94     //Perform Decryption
95     byte[] decryptedText = cipher.doFinal(cipherText);
96     
97     return new String(decryptedText);
98 }
99}