/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "<WebSig>" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Institute for
 * Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
 * The development of this software was partly funded by the European 
 * Commission in the <WebSig> project in the ISIS Programme. 
 * For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * XSEC
 *
 * XSECCryptoKeyDSA := DSA Keys
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: XSECCryptoKeyHMAC.hpp,v 1.4 2003/03/02 08:21:01 blautenb Exp $
 *
 */

#ifndef XSECCRYPTOKEYHMAC_INCLUDE
#define XSECCRYPTOKEYHMAC_INCLUDE

#include <xsec/enc/XSECCryptoKey.hpp>
#include <xsec/utils/XSECSafeBuffer.hpp>

/**
 * \ingroup crypto
 * @{
 */

/**
 * \brief Interface class for HMAC keys.
 *
 * The library uses classes derived from this to process HMAC keys.
 */

class DSIG_EXPORT XSECCryptoKeyHMAC : public XSECCryptoKey {

public :

	/** @name Constructors and Destructors */
	//@{
	
	XSECCryptoKeyHMAC() {};
	virtual ~XSECCryptoKeyHMAC() {};
	
	//@}

	/** @name Key Interface methods */
	//@{

	/**
	 * \brief Return the type of this key.
	 *
	 * For DSA keys, this allows people to determine whether this is a 
	 * public key, private key or a key pair
	 */

	virtual XSECCryptoKey::KeyType getKeyType() {return KEY_HMAC;}

	/**
	 * \brief Replicate key
	 */
	
	virtual XSECCryptoKey * clone() = 0;

	//@}

	/** @name Optional Interface methods
	 * 
	 * These functions do not necessarily have to be implmented.  They
	 * are used by XSECKeyInfoResolverDefault to try to create a key from
	 * KeyInfo elements without knowing anything else.
	 *
	 * If an interface class does not implement these functions, a simple
	 * stub that does nothing should be used.
	 */

	/**
	 * \brief Set the key
	 *
	 * Set the key from the buffer
	 *
	 * @param inBuf Buffer containing the key
	 * @param inLength Number of bytes of key in the buffer
	 */

	virtual void setKey(unsigned char * inBuf, unsigned int inLength) = 0;

	/**
	 * \brief Get the key value
	 * 
	 * Copy the key into the safeBuffer and return the number of bytes
	 * copied.
	 *
	 * @param outBuf Buffer to copy key into
	 * @returns number of bytes copied in
	 */

	virtual unsigned int getKey(safeBuffer &outBuf) = 0;

	//@}
};


#endif /* XSECCRYPTOKEYHMAC_INCLUDE */