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1/*
2 * To change this license header, choose License Headers in Project Properties.
3 * To change this template file, choose Tools | Templates
4 * and open the template in the editor.
5 */
6package javaapplication68;
7import java.security.Key;
8import java.security.KeyPair;
9import java.security.KeyPairGenerator;
10import java.security.Security;
11import java.security.SecureRandom;
12import javax.crypto.Cipher;
13import java.security.InvalidKeyException;
14import java.security.NoSuchAlgorithmException;
15import java.security.spec.InvalidKeySpecException;
16import java.util.logging.Level;
17import java.util.logging.Logger;
18import javax.crypto.BadPaddingException;
19import javax.crypto.IllegalBlockSizeException;
20import javax.crypto.NoSuchPaddingException;
21import javax.crypto.SecretKey;
22import javax.crypto.SecretKeyFactory;
23import javax.crypto.ShortBufferException;
24import javax.crypto.spec.PBEKeySpec;
25import javax.crypto.spec.SecretKeySpec;
26import javax.rmi.CORBA.Util;
27/**
28 *
29 * @author student
30 */
31public class JavaApplication68 {
32
33    /**
34     * @param args the command line arguments
35     */
36    static SecureRandom myPRNG = new SecureRandom();
37    static char[] set = "ABCD".toCharArray();
38    public static char[] genRandom(int i, int j, int k, int l){                            
39        char[] ch = {set[i], set[j], set[k], set[l]};
40        return ch;
41    }
42    public static SecretKey genKey(char[] password, byte[] salt) throws InvalidKeySpecException{
43        SecretKey myAESPBKey = null;
44        try {
45            
46            int iteration_count = 10000;
47            int key_size = 128;
48            
49            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
50            PBEKeySpec pbekSpec = new PBEKeySpec(password, salt, iteration_count,key_size);
51            myAESPBKey = new SecretKeySpec(keyFactory.generateSecret(pbekSpec).getEncoded(), "AES");
52            
53            
54        } catch (NoSuchAlgorithmException ex) {
55            Logger.getLogger(JavaApplication68.class.getName()).log(Level.SEVERE, null, ex);
56        }
57        return myAESPBKey;
58    }
59    public static void main(String[] args) throws InvalidKeySpecException {
60        // TODO code application logic here
61        
62        char[] password = genRandom(myPRNG.nextInt(4),myPRNG.nextInt(4),myPRNG.nextInt(4),myPRNG.nextInt(4));
63        System.out.println(String.valueOf(password));
64        
65        byte[] salt = new byte[16];
66        myPRNG.nextBytes(salt);
67        
68        SecretKey key = null; 
69        try {
70            key = JavaApplication68.genKey(password,salt);
71        } catch (InvalidKeySpecException ex) {
72            Logger.getLogger(JavaApplication68.class.getName()).log(Level.SEVERE, null, ex);
73        }
74        System.out.println("AES key: " +javax.xml.bind.DatatypeConverter.printHexBinary(key.getEncoded()));
75        
76        for(int i=0;i<4;i++)
77            for(int j=0;j<4;j++)
78                for(int k=0;k<4;k++)
79                    for(int l=0;l<4;l++)
80                    {
81                        char[] genPassword = genRandom(i,j,k,l);
82                        SecretKey genKey = JavaApplication68.genKey(genPassword,salt);
83                                               
84                        if(key.equals(genKey)){
85                            System.out.println("Password is:" + String.valueOf(genPassword));
86                            break;
87                        }
88                    }    
89    }
90    
91}