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  }