Here you can find the source of bytesToLowerCaseHex(byte[] data)
private static String bytesToLowerCaseHex(byte[] data)
//package com.java2s; //License from project: Apache License public class Main { private static String bytesToLowerCaseHex(byte[] data) { StringBuffer buf = new StringBuffer(); for (int i = 0; i < data.length; i++) { int halfbyte = (data[i] >>> 4) & 0x0F; int two_halfs = 0; do {/*from ww w. java 2 s. co m*/ if ((0 <= halfbyte) && (halfbyte <= 9)) buf.append((char) ('0' + halfbyte)); else buf.append((char) ('a' + (halfbyte - 10))); halfbyte = data[i] & 0x0F; } while (two_halfs++ < 1); } return buf.toString(); } }