esg.common.QuickHash.java Source code

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Here is the source code for esg.common.QuickHash.java

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/***************************************************************************
*                                                                          *
*  Organization: Lawrence Livermore National Lab (LLNL)                    *
*   Directorate: Computation                                               *
*    Department: Computing Applications and Research                       *
*      Division: S&T Global Security                                       *
*        Matrix: Atmospheric, Earth and Energy Division                    *
*       Program: PCMDI                                                     *
*       Project: Earth Systems Grid (ESG) Data Node Software Stack         *
*  First Author: Gavin M. Bell (gavin@llnl.gov)                            *
*                                                                          *
****************************************************************************
*                                                                          *
*   Copyright (c) 2009, Lawrence Livermore National Security, LLC.         *
*   Produced at the Lawrence Livermore National Laboratory                 *
*   Written by: Gavin M. Bell (gavin@llnl.gov)                             *
*   LLNL-CODE-420962                                                       *
*                                                                          *
*   All rights reserved. This file is part of the:                         *
*   Earth System Grid Federation (ESGF) Data Node Software Stack           *
*                                                                          *
*   For details, see http://esgf.org/esg-node/                             *
*   Please also read this link                                             *
*    http://esgf.org/LICENSE                                               *
*                                                                          *
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*   without modification, are permitted provided that the following        *
*   conditions are met:                                                    *
*                                                                          *
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*   notice, this list of conditions and the disclaimer below.              *
*                                                                          *
*   * Redistributions in binary form must reproduce the above copyright    *
*   notice, this list of conditions and the disclaimer (as noted below)    *
*   in the documentation and/or other materials provided with the          *
*   distribution.                                                          *
*                                                                          *
*   Neither the name of the LLNS/LLNL nor the names of its contributors    *
*   may be used to endorse or promote products derived from this           *
*   software without specific prior written permission.                    *
*                                                                          *
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*   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LAWRENCE    *
*   LIVERMORE NATIONAL SECURITY, LLC, THE U.S. DEPARTMENT OF ENERGY OR     *
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***************************************************************************/

/**
   Description:
    
   Needed to write a quick hash thingy for quick generation of
   'unique' keys etc.
       
**/
package esg.common;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.*;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.math.BigInteger;

public class QuickHash {

    MessageDigest m = null;

    public QuickHash(String algo) throws NoSuchAlgorithmException {
        m = MessageDigest.getInstance(algo);
    }

    public QuickHash() throws NoSuchAlgorithmException {
        this("SHA1");
    }

    public String sum(String plaintext) {
        byte[] data = null;
        try {
            data = plaintext.getBytes("UTF-8");
        } catch (Throwable t) {
            t.printStackTrace();
        }
        m.update(data, 0, data.length);
        BigInteger i = new BigInteger(1, m.digest());
        return String.format("%1$032X", i);
    }

    public static void main(String[] args) {
        try {
            String val = null;
            String hash = null;
            QuickHash quickHash = new QuickHash(args[1]);
            for (int i = 0; i < 1; i++) {
                val = args[0] + (i % 1);
                System.out.print(val + " -> ");
                long start = System.currentTimeMillis();
                hash = quickHash.sum(val);
                System.out.println(hash + " -> t=" + (System.currentTimeMillis() - start));
            }
        } catch (Throwable t) {
            System.out.println(t.getMessage());
        }
    }
}