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Library for performing common cryptographic operations

There is a newer version: 2.2

/*
  $Id$

  Copyright (C) 2007-2011 Virginia Tech.
  All rights reserved.

  SEE LICENSE FOR MORE INFORMATION

  Author:  Middleware Services
  Email:   [email protected]
  Version: $Revision$
  Updated: $Date$
*/
package edu.vt.middleware.crypt.digest;

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

/**
 * SHA256 contains functions for hashing data using the SHA-256
 * algorithm. This algorithm outputs a 256 bit hash.
 *
 * @author  Middleware Services
 * @version  $Revision: 3 $
 */

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);
  }
}