Q1fHZXrP

1import java.io.BufferedReader;
2import java.io.IOException;
3import java.io.InputStreamReader;
4import java.security.InvalidAlgorithmParameterException;
5import java.security.Key;
6import java.security.KeyPair;
7import java.security.KeyPairGenerator;
8import java.security.Security;
9import java.security.SecureRandom;
10import javax.crypto.Cipher;
11import java.security.InvalidKeyException;
12import java.security.NoSuchAlgorithmException;
13import java.security.spec.InvalidKeySpecException;
14import javax.crypto.BadPaddingException;
15import javax.crypto.IllegalBlockSizeException;
16import javax.crypto.NoSuchPaddingException;
17import javax.crypto.SecretKey;
18import javax.crypto.SecretKeyFactory;
19import javax.crypto.ShortBufferException; 
20import javax.crypto.spec.IvParameterSpec;
21import javax.crypto.spec.PBEKeySpec;
22import javax.crypto.spec.SecretKeySpec;
23import javax.rmi.CORBA.Util;
24
25public class SILabSapt8 
26{
27    public static void main(String[] args) 
28            throws IOException, InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException 
29    {
30        boolean done = false;
31        String userPassword = null;
32        BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in));
33        do
34        {
35            System.out.print("Your password : ");
36            userPassword = inputReader.readLine();
37            if(userPassword.length() < 16 || userPassword.length() > 16)
38            {
39                System.out.println("Parola trebuie sa aiba 16 caractere");
40                done = false;
41            }else
42                done = true;
43        }while(!done);
44        inputReader.close();
45        doEncription(userPassword);
46    }
47    private static void doEncription(String uPass) 
48            throws InvalidKeyException, ShortBufferException, IllegalBlockSizeException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException
49    {
50        byte[] keyBytes = new byte[16];
51        SecureRandom myPRNG = new SecureRandom();
52        myPRNG.nextBytes(keyBytes);
53        SecretKeySpec myKey = new SecretKeySpec(keyBytes,"AES");
54        Cipher myAES = Cipher.getInstance("AES/CBC/NoPadding");
55        // Initialization vector        
56        byte[] iv = new byte[16];
57        IvParameterSpec ivp = new IvParameterSpec(iv);
58        // initialize AES objecy to encrypt mode
59        myAES.init(Cipher.ENCRYPT_MODE, myKey,ivp);
60        // initialize plaintext
61        byte[] plaintext = uPass.getBytes();
62        //initialize ciphertext
63        byte[] ciphertext = new byte[16];
64        // update cipher with the plaintext
65        int cLength = myAES.update(plaintext, 0, plaintext.length, ciphertext,0);
66        // process remaining blocks of plaintext
67        cLength += myAES.doFinal(ciphertext, cLength);
68        // print plaintext and ciphertext
69        System.out.println("plaintext: " +
70        javax.xml.bind.DatatypeConverter.printHexBinary(plaintext));
71        System.out.println("ciphertext: " +
72        javax.xml.bind.DatatypeConverter.printHexBinary(ciphertext));
73        // initialize AES for decryption   
74        myAES.init(Cipher.DECRYPT_MODE, myKey, ivp);
75       // myAES.init(Cipher.DECRYPT_MODE, myKey);
76        // initialize a new array of bytes to place the decryption
77        byte[] dec_plaintext = new byte[16];
78        cLength = myAES.update(ciphertext, 0, ciphertext.length, dec_plaintext,0);
79        // process remaining blocks of ciphertext
80        cLength += myAES.doFinal(dec_plaintext, cLength);
81        // print the new plaintext (hopefully identical to the initial one)
82        System.out.println("decrypted: " +
83        javax.xml.bind.DatatypeConverter.printHexBinary(dec_plaintext));
84        
85        // get a Cipher instance for RSA with PKCS1 padding
86        Cipher myRSA = Cipher.getInstance("RSA/ECB/PKCS1Padding");
87        // get an instance for the Key Generator
88        KeyPairGenerator myRSAKeyGen = KeyPairGenerator.getInstance("RSA");
89        // generate an 1024 bit key
90        myRSAKeyGen.initialize(1024, myPRNG);
91        KeyPair myRSAKeyPair = myRSAKeyGen.generateKeyPair();
92        // store the public and private key individually
93        Key pbKey = myRSAKeyPair.getPublic();
94        Key pvKey = myRSAKeyPair.getPrivate();
95        // init cipher for encryption
96        myRSA.init(Cipher.ENCRYPT_MODE, pbKey, myPRNG);
97        // encrypt, as expected we encrypt a symmetric key with RSA rather than
98        ciphertext = myRSA.doFinal(keyBytes);
99        // init cipher for decryption
100        myRSA.init(Cipher.DECRYPT_MODE, pvKey);
101        // decrypt
102        plaintext = myRSA.doFinal(ciphertext);
103        System.out.println("plaintext: " +
104        javax.xml.bind.DatatypeConverter.printHexBinary(plaintext));
105        System.out.println("ciphertext: " +
106        javax.xml.bind.DatatypeConverter.printHexBinary(ciphertext));
107        System.out.println("keybytes: " +
108        javax.xml.bind.DatatypeConverter.printHexBinary(keyBytes));
109        
110        
111        char[] password = uPass.toCharArray();
112        byte[] salt = new byte[16];
113        int iteration_count = 10000;
114        int key_size = 128;
115        // set salt values to random
116        myPRNG.nextBytes(salt);
117        // initialize key factory for HMAC-SHA1 derivation
118        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
119        // set key specification
120        PBEKeySpec pbekSpec = new PBEKeySpec(password, salt, iteration_count,key_size);
121        // generate the key
122        SecretKey myAESPBKey = new SecretKeySpec(keyFactory.generateSecret(pbekSpec).getEncoded(), "AES");
123        // print the key
124        System.out.println("AES key: " +javax.xml.bind.DatatypeConverter.printHexBinary(myAESPBKey.getEncoded()));
125    }
126}