org.apache.logging.log4j.util.NameUtil Maven / Gradle / Ivy
/*
* 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 edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Objects;
/**
*
*/
@InternalApi
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 MD5 hash
* of the given input string encoded using the default platform
* {@link Charset charset}.
*
* MD5 has severe vulnerabilities and should not be used for sharing any
* sensitive information. 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
*/
@SuppressFBWarnings(value = "WEAK_MESSAGE_DIGEST_MD5", justification = "Used to create unique identifiers.")
@Deprecated
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) {
md5.append(Character.forDigit((0xFF & b) >> 4, 16));
md5.append(Character.forDigit(0x0F & b, 16));
}
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);
}
}
}