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JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java
There is a newer version: 2.1.39
/* HMACT64 keyed hashing algorithm
 * Copyright (C) 2003 "Eric Glass" 
 *
 * 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.
 *
 * 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
 */

package jcifs.util;


import java.security.MessageDigest;


/**
 * This is an implementation of the HMACT64 keyed hashing algorithm.
 * HMACT64 is defined by Luke Leighton as a modified HMAC-MD5 (RFC 2104)
 * in which the key is truncated at 64 bytes (rather than being hashed
 * via MD5).
 */
class HMACT64 extends MessageDigest implements Cloneable {

    private static final int BLOCK_LENGTH = 64;

    private static final byte IPAD = (byte) 0x36;

    private static final byte OPAD = (byte) 0x5c;

    private MessageDigest md5;

    private byte[] ipad = new byte[BLOCK_LENGTH];

    private byte[] opad = new byte[BLOCK_LENGTH];


    /**
     * Creates an HMACT64 instance which uses the given secret key material.
     *
     * @param key
     *            The key material to use in hashing.
     */
    public HMACT64 ( byte[] key ) {
        super("HMACT64");
        int length = Math.min(key.length, BLOCK_LENGTH);
        for ( int i = 0; i < length; i++ ) {
            this.ipad[ i ] = (byte) ( key[ i ] ^ IPAD );
            this.opad[ i ] = (byte) ( key[ i ] ^ OPAD );
        }
        for ( int i = length; i < BLOCK_LENGTH; i++ ) {
            this.ipad[ i ] = IPAD;
            this.opad[ i ] = OPAD;
        }

        this.md5 = Crypto.getMD5();
        engineReset();
    }


    private HMACT64 ( HMACT64 hmac ) throws CloneNotSupportedException {
        super("HMACT64");
        this.ipad = hmac.ipad;
        this.opad = hmac.opad;
        this.md5 = (MessageDigest) hmac.md5.clone();
    }


    @Override
    public Object clone () {
        try {
            return new HMACT64(this);
        }
        catch ( CloneNotSupportedException ex ) {
            throw new IllegalStateException(ex.getMessage());
        }
    }


    @Override
    protected byte[] engineDigest () {
        byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        return this.md5.digest(digest);
    }


    @Override
    protected int engineDigest ( byte[] buf, int offset, int len ) {
        byte[] digest = this.md5.digest();
        this.md5.update(this.opad);
        this.md5.update(digest);
        try {
            return this.md5.digest(buf, offset, len);
        }
        catch ( Exception ex ) {
            throw new IllegalStateException();
        }
    }


    @Override
    protected int engineGetDigestLength () {
        return this.md5.getDigestLength();
    }


    @Override
    protected void engineReset () {
        this.md5.reset();
        this.md5.update(this.ipad);
    }


    @Override
    protected void engineUpdate ( byte b ) {
        this.md5.update(b);
    }


    @Override
    protected void engineUpdate ( byte[] input, int offset, int len ) {
        this.md5.update(input, offset, len);
    }

}