| /* |
| * 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.logging.log4j.util; |
| |
| import java.nio.charset.Charset; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Objects; |
| |
| /** |
| * |
| */ |
| public final class NameUtil { |
| |
| private NameUtil() {} |
| |
| public static String getSubName(final String name) { |
| if (Strings.isEmpty(name)) { |
| return null; |
| } |
| final int i = name.lastIndexOf('.'); |
| return i > 0 ? name.substring(0, i) : Strings.EMPTY; |
| } |
| |
| /** |
| * Calculates the <a href="https://en.wikipedia.org/wiki/MD5">MD5</a> hash |
| * of the given input string encoded using the default platform |
| * {@link Charset charset}. |
| * <p> |
| * <b>MD5 has severe vulnerabilities and should not be used for sharing any |
| * sensitive information.</b> This function should only be used to create |
| * unique identifiers, e.g., configuration element names. |
| * |
| * @param input string to be hashed |
| * @return string composed of 32 hexadecimal digits of the calculated hash |
| */ |
| public static String md5(final String input) { |
| Objects.requireNonNull(input, "input"); |
| try { |
| final byte[] inputBytes = input.getBytes(); |
| final MessageDigest digest = MessageDigest.getInstance("MD5"); |
| final byte[] bytes = digest.digest(inputBytes); |
| final StringBuilder md5 = new StringBuilder(bytes.length * 2); |
| for (final byte b : bytes) { |
| final String hex = Integer.toHexString(0xFF & b); |
| if (hex.length() == 1) { |
| md5.append('0'); |
| } |
| md5.append(hex); |
| } |
| return md5.toString(); |
| } |
| // Every implementation of the Java platform is required to support MD5. |
| // Hence, this catch block should be unreachable. |
| // See https://docs.oracle.com/javase/8/docs/api/java/security/MessageDigest.html |
| // for details. |
| catch (final NoSuchAlgorithmException error) { |
| throw new RuntimeException(error); |
| } |
| } |
| |
| } |