simple hashing

sha1

  static String sha1(String input) {
    MessageDigest mDigest = null;
    try {
      mDigest = MessageDigest.getInstance("SHA1");
    } catch (NoSuchAlgorithmException e) {
      return "";
    }
    byte[] result = mDigest.digest(input.getBytes());
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < result.length; i++) {
      sb.append(Integer.toString((result[i] & 0xff) + 0x100, 16).substring(1));
    }

    return sb.toString();
  }