ObjFW  Diff

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
 *               2018, 2019, 2020
 *   Jonathan Schleifer <js@nil.im>
 * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
 *
 * 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.
 *

	[_innerHash release];
	[_outerHashCopy release];
	[_innerHashCopy release];

	[super dealloc];
}

- (void)setKey: (const void *)key
- (void)setKey: (const void *)key length: (size_t)length
	length: (size_t)length
{
	void *pool = objc_autoreleasePoolPush();
	size_t blockSize = [_hashClass blockSize];
	OFSecureData *outerKeyPad = [OFSecureData
		    dataWithCount: blockSize
	    allowsSwappableMemory: _allowsSwappableMemory];
	OFSecureData *innerKeyPad = [OFSecureData

	_outerHash = _innerHash = _outerHashCopy = _innerHashCopy = nil;

	@try {
		if (length > blockSize) {
			id <OFCryptoHash> hash = [_hashClass
			    cryptoHashWithAllowsSwappableMemory:
			    _allowsSwappableMemory];

			[hash updateWithBuffer: key
			[hash updateWithBuffer: key length: length];
					length: length];

			length = hash.digestSize;
			if OF_UNLIKELY (length > blockSize)
				length = blockSize;

			memcpy(outerKeyPadItems, hash.digest, length);
			memcpy(innerKeyPadItems, hash.digest, length);

	_outerHashCopy = [_outerHash copy];
	_innerHashCopy = [_innerHash copy];

	_calculated = false;
}

- (void)updateWithBuffer: (const void *)buffer
- (void)updateWithBuffer: (const void *)buffer length: (size_t)length
		  length: (size_t)length
{
	if (_innerHash == nil)
		@throw [OFInvalidArgumentException exception];

	if (_calculated)
		@throw [OFHashAlreadyCalculatedException
		    exceptionWithObject: self];

	[_innerHash updateWithBuffer: buffer
	[_innerHash updateWithBuffer: buffer length: length];
			      length: length];
}

- (const unsigned char *)digest
{
	if (_outerHash == nil || _innerHash == nil)
		@throw [OFInvalidArgumentException exception];