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1javax.crypto.BadPaddingException
2// Get the key generator            
3   KeyGenerator kg = KeyGenerator.getInstance("AES");
4   kg.init(128);
5   SecretKey sk = kg.generateKey();
6   byte[] iv = new byte[]{0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
7   AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
8
9   ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
10   dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
11
12   ecipher.init(Cipher.ENCRYPT_MODE, sk,paramSpec);
13   dcipher.init(Cipher.DECRYPT_MODE, sk,paramSpec);
14	
15public String decr(String str) {
16        try {
17            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
18            byte[] utf8 = dcipher.doFinal(dec);
19            return new String(utf8, "UTF8");
20        } catch (Exception ex) {
21            return null;
22        }
23    }
24	
25public String encr(String str) {
26        try {
27            byte[] utf8 = str.getBytes("UTF8");
28            byte[] enc = ecipher.doFinal(utf8);
29            return new sun.misc.BASE64Encoder().encode(enc);
30        } catch (Exception ex) {
31            return null;
32        }
33    }
34	
35package com.sandbox;
36
37import java.io.IOException;
38import java.io.UnsupportedEncodingException;
39import java.security.spec.AlgorithmParameterSpec;
40
41import javax.crypto.BadPaddingException;
42import javax.crypto.Cipher;
43import javax.crypto.IllegalBlockSizeException;
44import javax.crypto.KeyGenerator;
45import javax.crypto.SecretKey;
46import javax.crypto.spec.IvParameterSpec;
47
48public class EncryptionTest
49{
50    private final Cipher ecipher;
51    private final Cipher dcipher;
52
53    public EncryptionTest() throws Exception
54    {
55        KeyGenerator kg = KeyGenerator.getInstance("AES");
56        kg.init(128);
57        SecretKey sk = kg.generateKey();
58        byte[] iv = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
59        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
60
61        ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
62        dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
63
64        ecipher.init(Cipher.ENCRYPT_MODE, sk, paramSpec);
65        dcipher.init(Cipher.DECRYPT_MODE, sk, paramSpec);
66    }
67
68    public String encrypt(String str) throws IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException
69    {
70        byte[] utf8 = str.getBytes("UTF8");
71        byte[] enc = ecipher.doFinal(utf8);
72        return new sun.misc.BASE64Encoder().encode(enc);
73    }
74
75    public String decrypt(String str) throws IOException, IllegalBlockSizeException, BadPaddingException
76    {
77        byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
78        byte[] utf8 = dcipher.doFinal(dec);
79        return new String(utf8, "UTF8");
80    }
81
82    public static void main(String[] args)
83    {
84        try
85        {
86            EncryptionTest sandbox = new EncryptionTest();
87            System.out.println(sandbox.decrypt(sandbox.encrypt("Hello world")));
88        }
89        catch (Exception e)
90        {
91          e.printStackTrace();
92        }
93    }
94}