Java tutorial
//package com.java2s; public class Main { public static byte[] hexByteArrayToByteArray(byte[] hexByteArray) { return hexStringToByteArray(new String(hexByteArray)); } public static byte[] hexStringToByteArray(String hexString) { int len = hexString.length(); byte[] data = new byte[(len / 2)]; for (int i = 0; i < len; i += 2) { data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16)); } return data; } }