pZD8aDzX

1import javax.crypto.*;
2import javax.crypto.spec.IvParameterSpec;
3import java.io.*;
4import java.security.InvalidAlgorithmParameterException;
5import java.security.InvalidKeyException;
6import java.security.NoSuchAlgorithmException;
7import java.security.SecureRandom;
8
9public class Main {
10
11    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
12
13        // encrypt an java object and write to file
14
15        // create a java object
16        Employee em1 = new Employee("steve", "123");
17
18        // generate symmetric key
19        KeyGenerator generator = KeyGenerator.getInstance( "AES" );
20        SecretKey key = generator.generateKey();
21
22        // generate IV
23        SecureRandom random = new SecureRandom();
24        byte [] iv = new byte [16];
25        random.nextBytes( iv );
26
27        // create cipher
28        Cipher cipher = Cipher.getInstance( key.getAlgorithm() + "/CBC/PKCS5Padding" );
29        cipher.init( Cipher.ENCRYPT_MODE, key, new IvParameterSpec( iv ) );
30
31        // create sealed object
32        SealedObject sealedEm1 = new SealedObject( em1, cipher);
33
34        // Create stream
35        FileOutputStream fos = new FileOutputStream("out.aes");
36        BufferedOutputStream bos = new BufferedOutputStream(fos);
37        CipherOutputStream cos = new CipherOutputStream(bos, cipher);
38        ObjectOutputStream oos = new ObjectOutputStream(cos);
39        oos.writeObject( sealedEm1 );
40        oos.close();
41
42
43        // read an encrypted java object from a file and decrypt it
44
45
46        // turn the mode of cipher to decryption
47        cipher.init( Cipher.DECRYPT_MODE, key, new IvParameterSpec( iv ) ); // reuse the key and iv generated before
48
49        // create stream
50        CipherInputStream cipherInputStream = new CipherInputStream( new BufferedInputStream( new FileInputStream( "out.aes" ) ), cipher );
51        ObjectInputStream inputStream = new ObjectInputStream( cipherInputStream );
52        SealedObject sealedObject = (SealedObject) inputStream.readObject();
53        Employee em2 = (Employee) sealedObject.getObject(cipher);
54        System.out.println(em2.name);
55
56
57    }
58}
59
60class Employee implements Serializable {
61    public String name = "";
62    public String ssn = "";
63
64    public Employee(String name, String ssn) {
65        this.name = name;
66        this.ssn = ssn;
67    }
68
69}