| /* |
| * Copyright 2011 Google 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. |
| */ |
| package com.google.gwt.util.tools.shared; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| /** |
| * Utility class to generate MD5 hashes using per-thread MD5 |
| * {@link MessageDigest} instance. |
| */ |
| public class Md5Utils { |
| |
| /** |
| * Per thread MD5 instance. |
| */ |
| private static final ThreadLocal<MessageDigest> perThreadMd5 = |
| new ThreadLocal<MessageDigest>() { |
| @Override |
| protected MessageDigest initialValue() { |
| try { |
| return MessageDigest.getInstance("MD5"); |
| } catch (NoSuchAlgorithmException e) { |
| throw new RuntimeException("MD5 implementation not found", e); |
| } |
| } |
| }; |
| |
| /** |
| * Generate MD5 digest. |
| * |
| * @param input input data to be hashed. |
| * @return MD5 digest. |
| */ |
| public static byte[] getMd5Digest(byte[] input) { |
| MessageDigest md5 = perThreadMd5.get(); |
| md5.reset(); |
| md5.update(input); |
| return md5.digest(); |
| } |
| |
| /** |
| * Generate MD5 digest. |
| */ |
| public static byte[] getMd5Digest(String string) { |
| return getMd5Digest(string.getBytes()); |
| } |
| } |