Java tutorial
//package com.java2s; public class Main { private static String byteToHexString(byte[] digest) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < digest.length; i++) { String hex = Integer.toHexString(0xFF & digest[i]); if (hex.length() == 1) { sb.append('0'); } sb.append(hex); } return sb.toString(); } }