Here you can find the source of toHex(byte[] digest)
public static String toHex(byte[] digest)
//package com.java2s; /*// w w w.j a v a 2s. c o m * Copyright 2012 Netflix, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static String toHex(byte[] digest) { StringBuilder sb = new StringBuilder(digest.length * 2); for (byte b : digest) { String hex = Integer.toHexString(b); if (hex.length() == 1) { sb.append("0"); } else if (hex.length() == 8) { hex = hex.substring(6); } sb.append(hex); } return sb.toString().toLowerCase(); } }