/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This file is based on:
* - org.apache.catalina.util.MD5Encoder
* from the Apache Tomcat project.
*
* 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.opencms.webdav;
/**
* Encode an MD5 digest into a String.<p>
*
* 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.
*
* @since 6.5.6
*/
public final class CmsMD5Encoder {
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.<p>
*
* @param binaryData array containing the digest
*
* @return encoded MD5, or null if encoding failed
*/
public 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);
}
}