| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.dubbo.common.utils; |
| |
| import org.apache.dubbo.common.logger.Logger; |
| import org.apache.dubbo.common.logger.LoggerFactory; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| /** |
| * MD5 util. |
| */ |
| public class MD5Utils { |
| |
| private static final Logger logger = LoggerFactory.getLogger(MD5Utils.class); |
| |
| private static final char[] hexDigits = { |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' |
| }; |
| |
| private MessageDigest mdInst; |
| |
| public MD5Utils() { |
| try { |
| mdInst = MessageDigest.getInstance("MD5"); |
| } catch (NoSuchAlgorithmException e) { |
| logger.error("Failed to obtain md5", e); |
| } |
| } |
| |
| /** |
| * Calculation md5 value of specify string |
| * @param input |
| */ |
| public String getMd5(String input) { |
| byte[] md5; |
| // MessageDigest instance is NOT thread-safe |
| synchronized (mdInst) { |
| mdInst.update(input.getBytes(UTF_8)); |
| md5 = mdInst.digest(); |
| } |
| |
| int j = md5.length; |
| char str[] = new char[j * 2]; |
| int k = 0; |
| for (int i = 0; i < j; i++) { |
| byte byte0 = md5[i]; |
| str[k++] = hexDigits[byte0 >>> 4 & 0xf]; |
| str[k++] = hexDigits[byte0 & 0xf]; |
| } |
| return new String(str); |
| } |
| |
| } |