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1import javax.crypto.Cipher;
2import javax.crypto.Mac;
3import javax.crypto.spec.IvParameterSpec;
4import javax.crypto.spec.SecretKeySpec;
5import java.security.AlgorithmParameters;
6import java.security.spec.KeySpec;
7import javax.crypto.Cipher;
8import javax.crypto.SecretKey;
9import javax.crypto.SecretKeyFactory;
10import javax.crypto.spec.IvParameterSpec;
11import javax.crypto.spec.PBEKeySpec;
12import javax.crypto.spec.SecretKeySpec;
13import java.security.MessageDigest;
14import java.security.NoSuchAlgorithmException;
15
16public class EncryptorDecryptor {
17  public static void main(String[] args) {
18
19    String key = "11111111111111111111111111111111";
20    String iv  = "0000000000000000";
21    String payload = "B2AD9F69870A383FE19CAA8182723860";
22
23    String plaintext = null;
24    try {
25     plaintext = myDecrypt(payload, iv, key);
26    } catch (Exception e) {
27     e.printStackTrace();
28    }
29
30    System.out.println("plain: " + plaintext);
31  }
32  public static String bin2hex(byte[] data) {
33    if (data == null) {
34     return null;
35    }
36    int len = data.length;
37    String str = "";
38    for (int i = 0; i < len; i++) {
39     if ((data[i] & 0xFF) < 16)
40      str = str + "0" + java.lang.Integer.toHexString(data[i] & 0xFF);
41     else
42      str = str + java.lang.Integer.toHexString(data[i] & 0xFF);
43    }
44    return str;
45  }
46  public static byte[] hex2bin(String str) {
47    if (str == null) {
48     return null;
49    } else if (str.length() < 2) {
50     return null;
51    } else {
52     int len = str.length() / 2;
53     byte[] buffer = new byte[len];
54     for (int i = 0; i < len; i++) {
55      buffer[i] = (byte) Integer.parseInt(str.substring(i * 2, i * 2 + 2), 16);
56     }
57     return buffer;
58    }
59  }
60
61  public static String myDecrypt(String payload, String iv, String key) throws Exception {
62    byte[] decodedKey = key.getBytes();
63    SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
64
65    IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
66
67    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
68    cipher.init(Cipher.DECRYPT_MODE, originalKey, ivspec);
69
70    byte[] payload_bytes = hex2bin(payload);
71    byte[] decrypted = cipher.doFinal(payload_bytes);
72    return new String(decrypted);
73  }
74}