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1private static String ALGORITHM = "AES";
2private static String DIGEST = "MD5";
3
4private static Cipher cipher;
5private static SecretKey password;
6private static IvParameterSpec IVParamSpec;
7private final static String pvtkey="GDNBCGDRFSC$%#%=";
8
9//16-byte private key
10private static byte[] IV = pvtkey.getBytes();
11
12public PassWordEncryptor() {
13    try {
14
15        //Encode digest
16        MessageDigest digest;           
17        digest = MessageDigest.getInstance(DIGEST);            
18        password = new SecretKeySpec(digest.digest(pvtkey.getBytes()), ALGORITHM);
19
20        //Initialize objects
21        cipher = Cipher.getInstance(TRANSFORMATION);
22        IVParamSpec = new IvParameterSpec(IV);
23
24    } catch (NoSuchAlgorithmException e) {
25        Log.i(Lams4gApp.TAG, "No such algorithm " + ALGORITHM);
26    } catch (NoSuchPaddingException e) {
27        System.out.println( "No such padding PKCS7"+ e);
28    }
29}
30/**
31Encryptor.
32
33@text String to be encrypted
34@return Base64 encrypted text
35
36*/
37public String encrypt(byte[] text) {
38
39    byte[] encryptedData;
40
41    try {
42
43        cipher.init(Cipher.ENCRYPT_MODE, password, IVParamSpec);
44        encryptedData = cipher.doFinal(text);
45
46    } catch (InvalidKeyException e) {
47        System.out.println( "Invalid key  (invalid encoding, wrong length, uninitialized, etc)."+ e);
48        return null;
49    } catch (InvalidAlgorithmParameterException e) {
50        System.out.println( "Invalid or inappropriate algorithm parameters for " + ALGORITHM+ e);
51        return null;
52    } catch (IllegalBlockSizeException e) {
53        System.out.println( "The length of data provided to a block cipher is incorrect"+ e);
54        return null;
55    } catch (BadPaddingException e) {
56        System.out.println( "The input data but the data is not padded properly."+ e);
57        return null;
58    }               
59    return Base64.encodeToString(encryptedData,Base64.DEFAULT);
60
61}
62	
63- (NSData *)AES128Operation:(CCOperation)operation key:(NSString *)key iv:(NSString *)iv
64{
65    char keyPtr[kCCKeySizeAES128 + 1];
66    bzero(keyPtr, sizeof(keyPtr));
67    //keyPtr = [58,-43,46,33,-105,83,-80,-5,99,59,2,109,63,89,-59,-91];
68    key = [key MD5];
69    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
70
71    char ivPtr[kCCBlockSizeAES128 + 1];
72    bzero(ivPtr, sizeof(ivPtr));
73    if (iv) {
74        [iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
75    }
76
77    NSUInteger dataLength = [self length];
78    size_t bufferSize = dataLength + kCCBlockSizeAES128;
79    void *buffer = malloc(bufferSize);
80
81    size_t numBytesEncrypted = 0;
82    CCCryptorStatus cryptStatus = CCCrypt(operation,
83                                          kCCAlgorithmAES128,
84                                          kCCOptionPKCS7Padding,
85                                          keyPtr,
86                                          kCCBlockSizeAES128,
87                                          ivPtr,
88                                          [self bytes],
89                                          dataLength,
90                                          buffer,
91                                          bufferSize,
92                                          &numBytesEncrypted);
93    if (cryptStatus == kCCSuccess) {
94        return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
95    }
96    free(buffer);
97    return nil;
98}