001    /*
002     * MD5Hash.java
003     *
004     * Created on July 27, 2004, 1:42 PM
005     *
006     * This file is part of the STAR Scheduler.
007     * Copyright (c) 2002-2006 STAR Collaboration - Brookhaven National Laboratory
008     *
009     * STAR Scheduler is free software; you can redistribute it and/or modify
010     * it under the terms of the GNU General Public License as published by
011     * the Free Software Foundation; either version 2 of the License, or
012     * (at your option) any later version.
013     *
014     * STAR Scheduler is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU General Public License for more details.
018     *
019     * You should have received a copy of the GNU General Public License
020     * along with STAR Scheduler; if not, write to the Free Software
021     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
022     */
023    
024    package gov.bnl.star.offline.scheduler.util;
025    
026    import java.security.*;
027    
028    
029    /**
030     * Make MD5 hashs out of strings.
031     * @author  Levente Hajdu
032     */
033    public class MD5Hash extends Object {
034    
035    
036            /**
037             * Private function to turn md5 result to 32 hex-digit string
038             */
039      private static String asHex (byte hash[]) {
040        StringBuffer buf = new StringBuffer(hash.length * 2);
041        int i;
042    
043        for (i = 0; i < hash.length; i++) {
044          if (((int) hash[i] & 0xff) < 0x10) 
045            buf.append("0");
046    
047          buf.append(Long.toString((int) hash[i] & 0xff, 16));
048        }
049       
050        return buf.toString().toUpperCase();
051      }
052    
053            /**
054             * Take a string and return its md5 hash as a hex digit string
055             */
056      public static String hash(String arg)
057            {
058                    return hash(arg.getBytes());
059            }
060    
061            /**
062             * Non static version for VB
063             */
064      public String doHash(String arg)
065            {
066                    return hash(arg.getBytes());
067            }
068    
069            /**
070             * Take a byte array and return its md5 hash as a hex digit string
071             */
072      public static String hash(byte barray[])
073            {   
074                String restring = "";
075                try{
076                    MessageDigest md = MessageDigest.getInstance("MD5");
077                    md.update(barray);
078                    byte[] result = md.digest();            
079                    restring = asHex(result);
080                }  catch (NoSuchAlgorithmException nsa){ } 
081                
082                return restring;
083            }
084    
085    
086    }