Hash string : Hash Code « Development Class « Java

Hash string

//    Openbravo POS is a point of sales application designed for touch screens.
//    Copyright (C) 2007-2009 Openbravo, S.L.
//    http://www.openbravo.com/product/pos
//    This file is part of Openbravo POS.
//    Openbravo POS is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//    Openbravo POS is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    GNU General Public License for more details.
//    You should have received a copy of the GNU General Public License
//    along with Openbravo POS.  If not, see <http://www.gnu.org/licenses/>.

//package com.openbravo.pos.pda.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

 * @author jaroslawwozniak
public class StringUtils {

  private static final char[] hexchars = { '0', '1', '2', '3', '4', '5', '6',
      '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

  public static String byte2hex(byte[] binput) {

    StringBuffer sb = new StringBuffer(binput.length * 2);
    for (int i = 0; i < binput.length; i++) {
      int high = ((binput[i] & 0xF0) >> 4);
      int low = (binput[i] & 0x0F);
    return sb.toString();

  public static byte[] hex2byte(String sinput) {
    int length = sinput.length();

    if ((length & 0x01) != 0) {
      throw new IllegalArgumentException("odd number of characters.");

    byte[] out = new byte[length >> 1];

    // two characters form the hex value.
    for (int i = 0, j = 0; j < length; i++) {
      int f = Character.digit(sinput.charAt(j++), 16) << 4;
      f = f | Character.digit(sinput.charAt(j++), 16);
      out[i] = (byte) (f & 0xFF);

    return out;

  public static String hashString(String sPassword) {

    if (sPassword == null || sPassword.equals("")) {
      return "empty:";
    } else {
      try {
        MessageDigest md = MessageDigest.getInstance("SHA-1");
        byte[] res = md.digest();
        return "sha1:" + byte2hex(res);
      } catch (NoSuchAlgorithmException e) {
        return "plain:" + sPassword;
      } catch (UnsupportedEncodingException e) {
        return "plain:" + sPassword;


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