View Javadoc
1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *  http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.any23.util;
19  
20  import java.nio.charset.StandardCharsets;
21  import java.security.MessageDigest;
22  import java.security.NoSuchAlgorithmException;
23  
24  /**
25   * General utility functions.
26   *
27   * @author Michele Mostarda (mostarda@fbk.eu)
28   * @author Davide Palmisano (palmisano@fbk.eu)
29   */
30  public class MathUtils {
31  
32      private MathUtils() {
33      }
34  
35      public static final String md5(String s) {
36          try {
37              MessageDigest md5 = MessageDigest.getInstance("MD5");
38              md5.reset();
39              md5.update(s.getBytes(StandardCharsets.UTF_8));
40              byte[] digest = md5.digest();
41              StringBuffer result = new StringBuffer();
42              for (byte b : digest) {
43                  result.append(Integer.toHexString(0xFF & b));
44              }
45              return result.toString();
46          } catch (NoSuchAlgorithmException e) {
47              throw new RuntimeException("Should never happen, MD5 is supported", e);
48          }
49      }
50  
51  }