Here you can find the source of toHexString(byte[] md)
private static String toHexString(byte[] md)
//package com.java2s; //License from project: Open Source License public class Main { private static String toHexString(byte[] md) { char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; int j = md.length; char str[] = new char[j * 2]; for (int i = 0; i < j; i++) { byte byte0 = md[i]; str[2 * i] = hexDigits[byte0 >>> 4 & 0xf]; str[i * 2 + 1] = hexDigits[byte0 & 0xf]; }//from w w w . j a v a 2 s .c om return new String(str); } }