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/*
 * 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.tomcat.util.security;

import org.apache.tomcat.util.buf.HexUtils;

/**
 * Encode an MD5 digest into a String.
 * 

* The 128 bit MD5 hash is converted into a 32 character long String. * Each character of the String is the hexadecimal representation of 4 bits * of the digest. * * @author Remy Maucherat * * @deprecated Unused. Use {@link HexUtils} instead. Will be removed in Tomcat 11. */ @Deprecated public final class MD5Encoder { private MD5Encoder() { // Hide default constructor for utility class } private static final char[] hexadecimal = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; /** * Encodes the 128 bit (16 bytes) MD5 into a 32 character String. * * @param binaryData Array containing the digest * * @return Encoded MD5, or null if encoding failed */ public static String encode(byte[] binaryData) { if (binaryData.length != 16) { return null; } char[] buffer = new char[32]; for (int i=0; i<16; i++) { int low = binaryData[i] & 0x0f; int high = (binaryData[i] & 0xf0) >> 4; buffer[i*2] = hexadecimal[high]; buffer[i*2 + 1] = hexadecimal[low]; } return new String(buffer); } }





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