gnu.crypto.jce.mac.MacAdapter Maven / Gradle / Ivy
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package gnu.crypto.jce.mac;
// --------------------------------------------------------------------------
// $Id: MacAdapter.java,v 1.2 2003/01/11 06:12:45 raif Exp $
//
// Copyright (C) 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto 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.
//
// GNU Crypto 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
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
//
// --------------------------------------------------------------------------
import gnu.crypto.mac.IMac;
import gnu.crypto.mac.MacFactory;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.MacSpi;
/**
* The implementation of a generic {@link javax.crypto.Mac} adapter class
* to wrap GNU Crypto MAC instances.
*
* This class defines the Service Provider Interface (SPI) for
* the {@link javax.crypto.Mac} class, which provides the functionality of a
* message authentication code algorithm, such as the Hashed Message
* Authentication Code (HMAC) algorithms.
*
* @version $Revision: 1.2 $
*/
class MacAdapter extends MacSpi {
// Constants and variables
// -----------------------------------------------------------------------
/** Our MAC instance. */
protected IMac mac;
/** Our MAC attributes. */
protected Map attributes;
// Constructor(s)
// -----------------------------------------------------------------------
/**
* Private, "copying" constructor for cloning.
*
* @param that The instance being cloned.
*/
private MacAdapter(MacAdapter that) {
this.mac = (IMac) that.mac.clone();
this.attributes = new HashMap(that.attributes);
}
/**
* Creates a new Mac instance for the given name.
*
* @param name The name of the mac to create.
*/
protected MacAdapter(String name) {
mac = MacFactory.getInstance(name);
attributes = new HashMap();
}
// Class methods
// -----------------------------------------------------------------------
// Instance methods
// -----------------------------------------------------------------------
// Cloneable interface implementation ------------------------------------
public Object clone() {
return new MacAdapter(this);
}
// Instance methods implementing javax.crypto.MacSpi ---------------------
protected byte[] engineDoFinal() {
byte[] result = mac.digest();
engineReset();
return result;
}
protected int engineGetMacLength() {
return mac.macSize();
}
protected void engineInit(Key key, AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
if (!key.getFormat().equalsIgnoreCase("RAW")) {
throw new InvalidKeyException("unknown key format " + key.getFormat());
}
attributes.put(IMac.MAC_KEY_MATERIAL, key.getEncoded());
mac.reset();
mac.init(attributes);
}
protected void engineReset() {
mac.reset();
}
protected void engineUpdate(byte b) {
mac.update(b);
}
protected void engineUpdate(byte[] in, int off, int len) {
mac.update(in, off, len);
}
}