0zRwppre

1public String computeHash(String input) throws NoSuchAlgorithmException, UnsupportedEncodingException{
2            MessageDigest digest = MessageDigest.getInstance("SHA-256");
3            digest.reset();
4
5            byte[] byteData = digest.digest(input.getBytes("UTF-8"));
6            StringBuffer sb = new StringBuffer();
7
8            for (int i = 0; i < byteData.length; i++){
9            sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
10            }
11            return sb.toString();
12        }
13	
14/**
15 * Encryption of a given text using the provided secretKey
16 * 
17 * @param text
18 * @param secretKey
19 * @return the encoded string
20 * @throws SignatureException
21 */
22public static String hashMac(String text, String secretKey)
23  throws SignatureException {
24
25 try {
26  Key sk = new SecretKeySpec(secretKey.getBytes(), HASH_ALGORITHM);
27  Mac mac = Mac.getInstance(sk.getAlgorithm());
28  mac.init(sk);
29  final byte[] hmac = mac.doFinal(text.getBytes());
30  return toHexString(hmac);
31 } catch (NoSuchAlgorithmException e1) {
32  // throw an exception or pick a different encryption method
33  throw new SignatureException(
34    "error building signature, no such algorithm in device "
35      + HASH_ALGORITHM);
36 } catch (InvalidKeyException e) {
37  throw new SignatureException(
38    "error building signature, invalid key " + HASH_ALGORITHM);
39 }
40}
41
42where HASH_ALGORITHM is defined as
43
44private static final String HASH_ALGORITHM = "HmacSHA256";
45
46public static String toHexString(byte[] bytes) {  
47    StringBuilder sb = new StringBuilder(bytes.length * 2);  
48
49    Formatter formatter = new Formatter(sb);  
50    for (byte b : bytes) {  
51        formatter.format("%02x", b);  
52    }  
53
54    return sb.toString();  
55}