/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 * 3. The end-user documentation included with the redistribution,
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 *       "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.
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 * 4. The names "<WebSig>" and "Apache Software Foundation" must
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 * 5. Products derived from this software may not be called "Apache",
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 * 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. 
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 */

/*
 * XSEC
 *
 * OpenSSLCryptoHashHMAC := OpenSSL Implementation of HMAC
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: OpenSSLCryptoHashHMAC.hpp,v 1.3 2003/04/07 12:27:13 blautenb Exp $
 *
 */

#ifndef OPENSSLCRYPTOHASHHMAC_INCLUDE
#define OPENSSLCRYPTOHASHHMAC_INCLUDE

#include <xsec/framework/XSECDefs.hpp>
#include <xsec/enc/XSECCryptoHash.hpp>
#include <xsec/utils/XSECSafeBuffer.hpp>

// OpenSSL Includes

#include <openssl/evp.h>
#include <openssl/hmac.h>

class DSIG_EXPORT OpenSSLCryptoHashHMAC : public XSECCryptoHash {


public :

	// Constructors/Destructors
	
	OpenSSLCryptoHashHMAC(XSECCryptoHash::HashType alg);
	virtual ~OpenSSLCryptoHashHMAC();

	// Key activities
	virtual void		setKey(XSECCryptoKey * key);
	virtual const XMLCh * getProviderName() {return DSIGConstants::s_unicodeStrPROVOpenSSL;}

	// Hashing Activities
	virtual void		reset(void);					// Reset the hash
	virtual void		hash(unsigned char * data, 
							 unsigned int length);		// Hash some data
	virtual unsigned int finish(unsigned char * hash,
								unsigned int maxLength);// Finish and get hash

	// Get information
	virtual HashType getHashType(void);

private:

	// Not implemented constructors
	OpenSSLCryptoHashHMAC();

	const EVP_MD		* mp_md;						// Digest instance
	unsigned char		m_mdValue[EVP_MAX_MD_SIZE];		// Final output
	unsigned int		m_mdLen;						// Length of digest
	HashType			m_hashType;						// What type of hash is this?
	HMAC_CTX			m_hctx;							// Context for HMAC
	safeBuffer			m_keyBuf;						// The loaded key
	unsigned int		m_keyLen;						// The loaded key length
	bool				m_initialised;

};

#endif /* OPENSSLCRYPTOHASHHMAC_INCLUDE */