/*
* 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();
}
}