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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.
* <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.
*
* @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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