content: /*
   * 微信公众平台(JAVA) SDK
   *
   * Copyright (c) 2014, Ansitech Network Technology Co.,Ltd All rights reserved.
   * 
   * http://www.weixin4j.org/
   *
   * 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 org.weixin4j.util;
  
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  import org.weixin4j.misc.BASE64Encoder;
  
  /**
   * MD5加密算法
   *
   * @author yangqisheng
   * @since 0.0.1
   */
  public class MD5 {
  
      /**
       * 将字符串加密
       *
       * @param str 要加密的字符串
       * @return 加密后的字符串
       */
      public static String encryptByMd5(String str) {
          if (str == null) {
              return null;
          }
          try {
              MessageDigest md5 = MessageDigest.getInstance("MD5");
              BASE64Encoder base64en = new BASE64Encoder();
              byte[] b = str.getBytes();
              byte[] digest = md5.digest(b);
              String newstr = base64en.encode(digest);
              return newstr;
          } catch (NoSuchAlgorithmException e) {
              throw new RuntimeException(e);
          }
      }
  }
  