Android Utililty Methods String Hash

try {
    MessageDigest md = MessageDigest.getInstance(algorithm);
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    byte[] hashBytes = md.digest();
    return convertToHex(hashBytes);
} catch (Exception e) {
return "";
...

String cacheKey;
try {
    final MessageDigest mDigest = MessageDigest.getInstance("MD5");
    mDigest.update(key.getBytes());
    cacheKey = bytesToHexString(mDigest.digest());
} catch (NoSuchAlgorithmException e) {
    cacheKey = String.valueOf(key.hashCode());
return cacheKey;

Hashtable ht = new Hashtable();
int i = 0, a = 0, b = 0, c = 0;
if (s.length() > 0) {
    while (i < s.length()) {
        a = i;
        while (s.charAt(i) != '=' && i < s.length()) {
            i++;
        b = i;
        while (s.charAt(i) != '&' && i < (s.length() - 1)) {
            i++;
        if (i < (s.length() - 1)) {
            c = i;
        } else {
            c = i + 1;
        ht.put(s.substring(a, b), s.substring(b + 1, c));
        i++;
return ht;

String hashValue = null;
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.reset();
md.update(pText.getBytes("ASCII"));
hashValue = encodeHex(md.digest());
return hashValue;

MessageDigest md;
byte[] sha1hash = new byte[40];
md = MessageDigest.getInstance(hash);
md.update(text.getBytes("iso-8859-1"), 0, text.length());
sha1hash = md.digest();
return convertToHex(sha1hash);