Uw6u4Qig

1import javax.crypto.Cipher;
2import java.security.spec.KeySpec;
3import javax.crypto.spec.PBEKeySpec;
4import javax.crypto.SecretKey;
5import javax.crypto.spec.SecretKeySpec;
6import javax.crypto.SecretKeyFactory;
7import java.security.AlgorithmParameters;
8import javax.crypto.spec.IvParameterSpec;
9
10public class Decrypter {
11    Cipher dcipher;
12
13    byte[] salt = new String("12345678").getBytes();
14    int iterationCount = 1024;
15    int keyStrength = 256;
16    SecretKey key;
17    byte[] iv;
18
19    Decrypter(String passPhrase) throws Exception {
20        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
21        KeySpec spec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount, keyStrength);
22        SecretKey tmp = factory.generateSecret(spec);
23        key = new SecretKeySpec(tmp.getEncoded(), "AES");
24        dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
25    }
26
27    public String encrypt(String data) throws Exception {
28        dcipher.init(Cipher.ENCRYPT_MODE, key);
29        AlgorithmParameters params = dcipher.getParameters();
30        iv = params.getParameterSpec(IvParameterSpec.class).getIV();
31        byte[] utf8EncryptedData = dcipher.doFinal(data.getBytes());
32        String base64EncryptedData = new sun.misc.BASE64Encoder().encodeBuffer(utf8EncryptedData);
33
34        System.out.println("IV " + new sun.misc.BASE64Encoder().encodeBuffer(iv));
35        System.out.println("Encrypted Data " + base64EncryptedData);
36        return base64EncryptedData;
37    }
38
39    public String decrypt(String base64EncryptedData) throws Exception {
40        dcipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
41        byte[] decryptedData = new sun.misc.BASE64Decoder().decodeBuffer(base64EncryptedData);
42        byte[] utf8 = dcipher.doFinal(decryptedData);
43        return new String(utf8, "UTF8");
44    }
45
46    public static void main(String args[]) throws Exception {
47        Decrypter decrypter = new Decrypter("ABCDEFGHIJKL");
48        String encrypted = decrypter.encrypt("the quick brown fox jumps over the lazy dog");
49        String decrypted = decrypter.decrypt(encrypted);
50        System.out.println(decrypted);
51    }
52}