d7Ju4cf5

1private static void doTest() throws Exception {
2        Security.addProvider(new BouncyCastleProvider());
3
4        byte[] clearData = "1234567890".getBytes();
5        SecretKey secretKey = new SecretKeySpec("0123456789ABCDEF".getBytes(), "AES");
6        AlgorithmParameterSpec IVspec = new IvParameterSpec("0123456789ABCDEF".getBytes());
7
8        // encrypt with PKCS7 padding
9        Cipher encrypterWithPad = Cipher.getInstance("AES/CBC/PKCS7PADDING", "BC");
10        encrypterWithPad.init(Cipher.ENCRYPT_MODE, secretKey, IVspec);
11        byte[] encryptedData = encrypterWithPad.doFinal(clearData);
12        System.out.println("Encryped data (" + encryptedData.length + " bytes): \t" + toHexString(encryptedData));
13
14        // decrypt with PKCS7 pad
15        Cipher decrypterWithPad = Cipher.getInstance("AES/CBC/PKCS7PADDING", "BC");
16        decrypterWithPad.init(Cipher.DECRYPT_MODE, secretKey, IVspec);
17        byte[] buffer1 = new byte[encryptedData.length];
18        int decryptLen1 = decrypterWithPad.doFinal(encryptedData, 0, encryptedData.length, buffer1);
19        System.out.println("Decrypted with Pad (" + decryptLen1 + " bytes):  \t" + buffer1);
20
21        // decrypt without PKCS7 pad
22        Cipher decrypterWithoutPad = Cipher.getInstance("AES/CBC/NOPADDING", "BC");
23        decrypterWithoutPad.init(Cipher.DECRYPT_MODE, secretKey, IVspec);
24        byte[] buffer2 = new byte[encryptedData.length];
25        int decryptLen2 = decrypterWithoutPad.doFinal(encryptedData, 0, encryptedData.length, buffer2);
26        System.out.println("Decrypted without Pad (" + decryptLen2 + " bytes):\t" + toHexString(buffer2));
27    }