/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012
* Jonathan Schleifer <js@webkeks.org>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFObject.h"
/**
* \brief A base class for classes providing hash functions.
*/
@interface OFHash: OFObject
{
BOOL calculated;
}
#ifdef OF_HAVE_PROPERTIES
@property (readonly, getter=isCalculated) BOOL calculated;
#endif
/**
* \brief Creates a new hash.
*
* \return A new autoreleased OFHash
*/
+ (instancetype)hash;
/**
* \brief Returns the digest size of the hash, in bytes.
*
* \return The digest size of the hash, in bytes
*/
+ (size_t)digestSize;
/**
* \brief Returns the block size of the hash, in bytes.
*
* \return The block size of the hash, in bytes
*/
+ (size_t)blockSize;
/**
* \brief Adds a buffer to the hash to be calculated.
*
* \param buffer The buffer which should be included into the calculation
* \param length The length of the buffer
*/
- (void)updateWithBuffer: (const void*)buffer
length: (size_t)length;
/**
* \brief Returns a buffer containing the hash.
*
* The size of the buffer depends on the hash used. The buffer is part of the
* receiver's memory pool.
*
* \return A buffer containing the hash
*/
- (uint8_t*)digest OF_RETURNS_INNER_POINTER;
/**
* \brief Returns a boolean whether the hash has already been calculated.
*
* \return A boolean whether the hash has already been calculated
*/
- (BOOL)isCalculated;
@end