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/usr/include/xsec/enc/OpenSSL/OpenSSLCryptoHash.hpp is in libxml-security-c-dev 1.7.3-1.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*
 * XSEC
 *
 * OpenSSLCryptoHash := OpenSSL Implementation of SHA1
 *
 * Author(s): Berin Lautenbach
 *
 * $Id: OpenSSLCryptoHash.hpp 1125514 2011-05-20 19:08:33Z scantor $
 *
 */

#ifndef OPENSSLCRYPTOHASHSHA1_INCLUDE
#define OPENSSLCRYPTOHASHSHA1_INCLUDE

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

// OpenSSL Includes

#if defined (XSEC_HAVE_OPENSSL)

#	include <openssl/evp.h>

/**
 * @ingroup opensslcrypto
 */

/**
 * \brief Interface definition for Hash functions.
 *
 * Uses the OpenSSL EVP_digest functions to implement the various
 * hash functions required by the OpenSSL library.
 *
 */

class DSIG_EXPORT OpenSSLCryptoHash : public XSECCryptoHash {

public :

	/** @name Constructors and Destructors */
	//@{

	OpenSSLCryptoHash(XSECCryptoHash::HashType alg);
	virtual ~OpenSSLCryptoHash();
	
	//@}

	/** @name HMAC Functions */
	//@{
	
	/**
	 *\brief
	 *
	 * Does nothing.  If the required function is an HMAC function,
	 * then OpenSSLCryptoHashHMAC should be used.
	 *
	 * @param key The key the HMAC function should use.
	 */

	virtual void		setKey(XSECCryptoKey * key) {}

	//@}

	/** @name Digest/Hash functions */
	//@{

	/**
	 * \brief Rest the hash function
	 *
	 * Re-initialises the digest structure.
	 */

	virtual void		reset(void);

	/**
	 * \brief Hash some data.
	 *
	 * Take length bytes of data from the data buffer and update the hash
	 * that already exists.  This function may (and normally will) be called
	 * many times for large blocks of data.
	 *
	 * @param data The buffer containing the data to be hashed.
	 * @param length The number of bytes to be read from data
	 */

	virtual void		hash(unsigned char * data, 
							 unsigned int length);
	/**
	 * \brief Finish up a Digest operation and read the result.
	 *
	 * This call tells the CryptoHash object that the input is complete and
	 * to finalise the Digest.  The output of the digest is read into the 
	 * hash buffer (at most maxLength bytes)
	 *
	 * @param hash The buffer the hash should be read into.
	 * @param maxLength The maximum number of bytes to be read into hash
	 * @returns The number of bytes copied into the hash buffer
	 */

	virtual unsigned int finish(unsigned char * hash,
								unsigned int maxLength);// Finish and get hash

	//@}

	/** @name Information functions */
	//@{

	/**
	 *\brief
	 *
	 * Determine the hash type of this object
	 *
	 * @returns The hash type
	 */

	virtual HashType getHashType(void) const;

	/**
	 * \brief Get OpenSSL hash context structure
	 */

	EVP_MD_CTX * getOpenSSLEVP_MD_CTX(void) {return &m_mdctx;}

	//@}


private:

	// Not implemented constructors
	OpenSSLCryptoHash();

	EVP_MD_CTX			m_mdctx;						// Context for digest
	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?

};

#endif /* XSEC_HAVE_OPENSSL */
#endif /* OPENSSLCRYPTOHASHSHA1_INCLUDE */