EeE4Ehm3

1Decryption Error: Pad block corrupted
2byte[] input = etInput.getText().toString().getBytes();
3    byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
4        0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
5
6    SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
7
8    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
9
10    // encryption pass
11    cipher.init(Cipher.ENCRYPT_MODE, key);
12
13    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
14    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
15    ctLength += cipher.doFinal(cipherText, ctLength);
16
17    cipher.init(Cipher.DECRYPT_MODE, key);
18    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
19    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
20
21    String strLength = new String(cipherText,"US-ASCII");
22    byte[] byteCiphterText = strLength.getBytes("US-ASCII");
23    Log.e("Decrypt", Integer.toString(byteCiphterText.length));
24
25    etOutput.setText(new String(cipherText,"US-ASCII"));
26
27    cipherText  = etOutput.getText().toString().getBytes("US-ASCII");
28    Log.e("Decrypt", Integer.toString(cipherText.length));
29
30    ptLength += cipher.doFinal(plainText, ptLength);
31    Log.e("Decrypt", new String(plainText));
32    Log.e("Decrypt", Integer.toString(ptLength));
33	
34ptLength += cipher.doFinal(plainText, ptLength);
35	
36public String Encrypt(String strPlainText) throws Exception, NoSuchProviderException,
37        NoSuchPaddingException {
38    byte[] input = strPlainText.getBytes();
39    byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
40            0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
41            0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
42
43    SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
44
45    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
46
47    // encryption pass
48    cipher.init(Cipher.ENCRYPT_MODE, key);
49
50    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
51    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
52    ctLength += cipher.doFinal(cipherText, ctLength);
53
54    return new String(cipherText, "US-ASCII");
55}
56
57public String Decrypt(String strCipherText) throws Exception,
58        NoSuchProviderException, NoSuchPaddingException {
59    byte[] cipherText = strCipherText.getBytes("US-ASCII");
60    int ctLength = cipherText.length;
61    byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
62            0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
63            0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
64
65    SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
66
67    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
68
69    // decryption pass
70    cipher.init(Cipher.DECRYPT_MODE, key);
71    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
72    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
73    ptLength += cipher.doFinal(plainText, ptLength);
74
75    return new String(plainText);
76}
77	
78// this is a quick example - dont use sun.misc inproduction
79//  - go for some open source implementation
80String encryptedString = new sun.misc.BASE64Encoder.encodeBuffer(encryptedBytes);
81	
82static public byte[] decrypt(Cipher cipher, SecretKey key, byte[]... bytes)
83        throws GeneralSecurityException, IOException {
84    cipher.init(Cipher.DECRYPT_MODE, key);
85    ByteArrayOutputStream bos = new ByteArrayOutputStream();
86    for (int i = 0; i < bytes.length; i++) {
87        bos.write(cipher.update(bytes[i]));
88    }
89    bos.write(cipher.doFinal());
90    return bos.toByteArray();
91}