/usr/include/xsec/enc/XSECCryptoHash.hpp is in libxml-security-c-dev 1.7.2-2.
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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
*
* XSECCryptoProvider := Base virtual class to define a hash algorithm
*
* Author(s): Berin Lautenbach
*
* $Id: XSECCryptoHash.hpp 1125514 2011-05-20 19:08:33Z scantor $
*
*/
#ifndef XSECCRYPTOHASH_INCLUDE
#define XSECCRYPTOHASH_INCLUDE
#include <xsec/framework/XSECDefs.hpp>
#include <xsec/enc/XSECCryptoKey.hpp>
#define XSEC_MAX_HASH_SIZE 256 /* Max size of any expected hash algorithms (oversized) */
#define XSEC_MAX_HASH_BLOCK_SIZE 64 /* Max size of blocks used - MD5 and SHA1 are both 64 bytes*/
/**
* @ingroup crypto
*/
/**
* \brief Interface definition for Hash functions.
*
* The XSECCryptoHash function is used by the library to manipulate
* Hashing (Digest) functions.
*
* It is also used as the base class for HMAC functions, and thus has
* a #setKey() method.
*
* @todo bring the interface here in-line with that provided for
* XSECCryptoBase64 - really should have only one way of calling these
* kinds of objects.
*
*/
class DSIG_EXPORT XSECCryptoHash {
public :
/**
* \brief Enumeration of Hash (Digest) types
*
* The hash types known to XSEC
*/
enum HashType {
HASH_NONE = 0,
HASH_SHA1 = 1,
HASH_MD5 = 2,
HASH_SHA224 = 3,
HASH_SHA256 = 4,
HASH_SHA384 = 5,
HASH_SHA512 = 6
};
// Constructors/Destructors
XSECCryptoHash() {};
virtual ~XSECCryptoHash() {};
/** @name Digest/Hash functions */
//@{
/**
* \brief Rest the hash function
*
* XSEC will call the #reset() function prior to re-using a CryptoHash
* object.
*/
virtual void reset(void) = 0; // Reset the hash
/**
* \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) = 0;
/**
* \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) = 0;// Finish and get hash
//@}
/** @name Information functions */
//@{
/**
*\brief
*
* Determine the hash type of this object
*
* @returns The hash type
*/
virtual HashType getHashType(void) const = 0;
//@}
/** @name HMAC Functions */
//@{
/**
*\brief
*
* The HMAC classes are treated in the library as standard hash
* objects that just happen to take a key. Thus all hash functions
* implement this function (potentially just to throw an exception)
*
* Sets the key - which needs to have a base class of
* XSECCryptoKeyHMAC.
*
* @param key The key the HMAC function should use.
*/
virtual void setKey(XSECCryptoKey * key) = 0;
//@}
};
#endif /* XSECCRYPTOHASH_INCLUDE */
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