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 /*
  * Copyright 1999,2004 The Apache Software Foundation.
  * 
  * Licensed 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 net.sf.webdav.fromcatalina;

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(s):
Remy Maucherat
Version:
$Revision: 1.1 $ $Date: 2007-01-05 03:23:22 $
public final class MD5Encoder {
    // ----------------------------------------------------- Instance Variables
    private static final char[] hexadecimal = { '0''1''2''3''4''5',
	    '6''7''8''9''a''b''c''d''e''f' };
    // --------------------------------------------------------- Public Methods

    
Encodes the 128 bit (16 bytes) MD5 into a 32 character String.

Parameters:
binaryData Array containing the digest
Returns:
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 = (int) (binaryData[i] & 0x0f);
	    int high = (int) ((binaryData[i] & 0xf0) >> 4);
	    buffer[i * 2] = [high];
	    buffer[i * 2 + 1] = [low];
	}
	return new String(buffer);
    }
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