5bVRAXiH

1why decryption fails for certain data only
2public class App 
3{
4    static byte[] seckey=null;
5    static
6    {
7        try
8        {
9            KeyGenerator kgen = KeyGenerator.getInstance("AES");
10              kgen.init(128); 
11
12                        // Generate the secret key specs.             
13                        // SecretKey skey = kgen.generateKey();
14                        // seckey = skey.getEncoded();
15                        // above won't work as can't generate new secret key for decrypt. Have to use same key for encrypt and decrypt
16
17                        // seckey = new byte[]{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};
18                        seckey = new byte[]{(byte)172,(byte)236,(byte)125,(byte)222,(byte)188,(byte)33,(byte)210,(byte)4,(byte)202,(byte)31,(byte)188,(byte)152,(byte)220,(byte)104,(byte)62,(byte)64};
19
20
21        } catch (NoSuchAlgorithmException e)
22        {           
23            e.printStackTrace();
24        }
25
26
27    }
28    public static void main( String[] args )
29    {   
30
31        String password = encrypt("A123456"); //working
32        System.out.println(password);
33        System.out.println(decrypt(password));
34
35        String password = encrypt("A*501717"); //NOT working
36        System.out.println(password);
37        System.out.println(decrypt(password));
38
39    }    
40    public static String encrypt(String passwd)
41    {
42        SecretKeySpec key = new SecretKeySpec(seckey, "AES");
43        byte[] output;
44        try
45        {
46            Cipher cipher = Cipher.getInstance("AES");
47
48            // encryption pass
49            cipher.init(Cipher.ENCRYPT_MODE, key);
50            output = cipher.doFinal(passwd.getBytes());
51        } catch (Exception e)
52        {
53            System.out.println("Unable to encrypt password.");
54            output = "".getBytes();
55        }
56
57        return new String(output);
58
59    }
60
61    public static String decrypt(String passwd)
62    {
63        if (!StringUtils.isNotBlank(passwd))
64            return "";
65
66            SecretKeySpec key = new SecretKeySpec(seckey, "AES");
67
68        byte[] output;
69        try
70        {
71            Cipher cipher = Cipher.getInstance("AES");
72            // decryption pass
73            cipher.init(Cipher.DECRYPT_MODE, key);
74            output = cipher.doFinal(passwd.getBytes());
75        } catch (Exception e)
76        {
77            System.out.println("Unable to decrypt password");
78            output = "".getBytes();
79        }
80
81        return new String(output);
82
83    }
84   }
85	
86seckey = new byte[]{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};