Package org.gudy.azureus2.core3.util

Source Code of org.gudy.azureus2.core3.util.SHA1Hasher

/*
* Created on Apr 13, 2004
* Created by Alon Rohter
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/

package org.gudy.azureus2.core3.util;

import java.nio.ByteBuffer;


/**
* SHA-1 hasher utility frontend.
*/
public final class SHA1Hasher {
  private final SHA1 sha1;


  /**
   * Create a new SHA1Hasher instance
   */
  public SHA1Hasher() {
    sha1 = new SHA1();
  }

 
  /**
   * Calculate the SHA-1 hash for the given bytes.
   * @param bytes data to hash
   * @return 20-byte hash
   */
  public byte[] calculateHash( byte[] bytes ) {
    ByteBuffer buff = ByteBuffer.wrap( bytes );
    return calculateHash( buff );
  }

 
  /**
   * Calculate the SHA-1 hash for the given buffer.
   * @param buffer data to hash
   * @return 20-byte hash
   */
  public byte[] calculateHash( ByteBuffer buffer ) {
    sha1.reset();
    return sha1.digest( buffer );
  }
 
 
  /**
   * Start or continue a hash calculation with the given data.
   * @param data input
   */
  public void update( byte[] data ) {
    update( ByteBuffer.wrap( data ));
  }
 
 
  /**
   * Start or continue a hash calculation with the given data,
   * starting at the given position, for the given length.
   * @param data input
   * @param pos start position
   * @param len length
   */
  public void update( byte[] data, int pos, int len ) {
    update( ByteBuffer.wrap( data, pos, len ));
  }
 
 
  /**
   * Start or continue a hash calculation with the given data.
   * @param buffer data input
   */
  public void update( ByteBuffer buffer ) {
    sha1.update( buffer );
  }
 

  /**
   * Finish the hash calculation.
   * @return 20-byte hash
   */
  public byte[] getDigest() {
    return sha1.digest();
  }
 
  public HashWrapper getHash() {
    return new HashWrapper(sha1.digest());
 
 
  /**
   * Resets the hash calculation.
   */
  public void reset() {
    sha1.reset();
  }
 

  /**
   * Save the current hasher state for later resuming.
   */
  public void saveHashState() {
    sha1.saveState();
  }
 
 
  /**
   * Restore the hasher state from previous save.
   */
  public void restoreHashState() {
    sha1.restoreState();
  }
 
}
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