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 }