edu.vt.middleware.crypt.digest.SHA256.java Source code

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Here is the source code for edu.vt.middleware.crypt.digest.SHA256.java

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/*
  $Id$
    
  Copyright (C) 2003-2013 Virginia Tech.
  All rights reserved.
    
  SEE LICENSE FOR MORE INFORMATION
    
  Author:  Middleware Services
  Email:   middleware@vt.edu
  Version: $Revision$
  Updated: $Date$
*/
package edu.vt.middleware.crypt.digest;

import java.security.SecureRandom;
import org.bouncycastle.crypto.digests.SHA256Digest;

/**
 * <p><code>SHA256</code> contains functions for hashing data using the SHA-256
 * algorithm. This algorithm outputs a 256 bit hash.</p>
 *
 * @author  Middleware Services
 * @version  $Revision$
 */

public class SHA256 extends DigestAlgorithm {

    /** Creates an uninitialized instance of an SHA256 digest. */
    public SHA256() {
        super(new SHA256Digest());
    }

    /**
     * Creates a new SHA256 digest that may optionally be initialized with random
     * data.
     *
     * @param  randomize  True to randomize initial state of digest, false
     * otherwise.
     */
    public SHA256(final boolean randomize) {
        super(new SHA256Digest());
        if (randomize) {
            setRandomProvider(new SecureRandom());
            setSalt(getRandomSalt());
        }
    }

    /**
     * Creates a new SHA256 digest and initializes it with the given salt.
     *
     * @param  salt  Salt data used to initialize digest computation.
     */
    public SHA256(final byte[] salt) {
        super(new SHA256Digest());
        setSalt(salt);
    }
}