dt4CL6Ca

1import java.security.spec.KeySpec;
2import javax.crypto.Cipher;
3import javax.crypto.SecretKey;
4import javax.crypto.SecretKeyFactory;
5import javax.crypto.spec.IvParameterSpec;
6import javax.crypto.spec.PBEKeySpec;
7import javax.crypto.spec.SecretKeySpec;
8import sun.misc.BASE64Decoder;
9import sun.misc.BASE64Encoder;
10
11public class AESEncrypter {
12
13    private static final byte[] SALT = {
14        (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
15        (byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03
16    };
17    private static final int ITERATION_COUNT = 65536;
18    private static final int KEY_LENGTH = 256;
19    private Cipher ecipher;
20    private Cipher dcipher;
21    
22    AESEncrypter(String passPhrase) throws Exception {
23        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
24        KeySpec spec = new PBEKeySpec(passPhrase.toCharArray(), SALT, ITERATION_COUNT, KEY_LENGTH);
25        SecretKey tmp = factory.generateSecret(spec);
26        SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
27
28        ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
29        ecipher.init(Cipher.ENCRYPT_MODE, secret);
30        
31        dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
32        byte[] iv = ecipher.getParameters().getParameterSpec(IvParameterSpec.class).getIV();
33        dcipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
34    }
35
36    public String encrypt(String encrypt) throws Exception {
37        byte[] bytes = encrypt.getBytes("UTF8");
38        byte[] encrypted = encrypt(bytes);
39        return new BASE64Encoder().encode(encrypted);
40    }
41
42    public byte[] encrypt(byte[] plain) throws Exception {
43        return ecipher.doFinal(plain);
44    }
45
46    public String decrypt(String encrypt) throws Exception {
47        byte[] bytes = new BASE64Decoder().decodeBuffer(encrypt);
48        byte[] decrypted = decrypt(bytes);
49        return new String(decrypted, "UTF8");
50    }
51
52    public byte[] decrypt(byte[] encrypt) throws Exception {
53        return dcipher.doFinal(encrypt);
54    }
55
56    public static void main(String[] args) throws Exception {
57
58        String message = "MESSAGE";
59        String password = "PASSWORD";
60
61        AESEncrypter encrypter = new AESEncrypter(password);
62        String encrypted = encrypter.encrypt(message);
63        String decrypted = encrypter.decrypt(encrypted);
64
65        System.out.println("Encrypt(\"" + message + "\", \"" + password + "\") = \"" + encrypted + "\"");
66        System.out.println("Decrypt(\"" + encrypted + "\", \"" + password + "\") = \"" + decrypted + "\"");
67    }
68}