ObjFW  Diff

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
 *               2018, 2019
 *   Jonathan Schleifer <js@heap.zone>
 *
 * 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.
 */

#include "config.h"

#import "OFHMAC.h"
#import "OFSHA256Hash.h"


#import "OFInvalidArgumentException.h"
#import "OFOutOfMemoryException.h"
#import "OFOutOfRangeException.h"

#import "scrypt.h"
#import "pbkdf2.h"

			memcpy(tmp, buffer, 128 * blockSize);
	}
}

void of_scrypt(size_t blockSize, size_t costFactor,
    size_t parallelization, const unsigned char *salt, size_t saltLength,
    const char *password, size_t passwordLength,
    unsigned char *key, size_t keyLength)
{
	uint32_t *tmp = NULL, *buffer = NULL;
	OFHMAC *HMAC = nil;

	if (blockSize == 0 || costFactor <= 1 ||
	    (costFactor & (costFactor - 1)) != 0 || parallelization == 0)
		@throw [OFInvalidArgumentException exception];

	/*
	 * These are defined by the functions above. They are defined there so
	 * that the check is next to the code and easy to verify, but actually
	 * checked here for performance.
	 */
	OVERFLOW_CHECK_1
	OVERFLOW_CHECK_2

	@try {


		if (costFactor > SIZE_MAX - 1 ||
		    (costFactor + 1) > SIZE_MAX / 128 ||
		    (costFactor + 1) * 128 > SIZE_MAX / blockSize)
			@throw [OFOutOfRangeException exception];

		if ((tmp = malloc((costFactor + 1) * 128 * blockSize)) == NULL)
			@throw [OFOutOfMemoryException
			    exceptionWithRequestedSize: (blockSize +
							costFactor) * 128];



		if (parallelization > SIZE_MAX / 128 ||
		    parallelization * 128 > SIZE_MAX / blockSize)
			@throw [OFOutOfRangeException exception];

		if ((buffer = malloc(parallelization * 128 *
		    blockSize)) == NULL)
			@throw [OFOutOfMemoryException
			    exceptionWithRequestedSize: parallelization * 128 *
							blockSize];


		HMAC = [[OFHMAC alloc] initWithHashClass: [OFSHA256Hash class]];



		of_pbkdf2(HMAC, 1, salt, saltLength, password, passwordLength,
		    (unsigned char *)buffer, parallelization * 128 * blockSize);


		for (size_t i = 0; i < parallelization; i++)
			of_scrypt_romix(buffer + i * 32 * blockSize, blockSize,
			    costFactor, tmp);

		of_pbkdf2(HMAC, 1, (unsigned char *)buffer, parallelization *
		    128 * blockSize, password, passwordLength, key, keyLength);

	} @finally {
		of_explicit_memset(tmp, 0, (costFactor + 1) * blockSize * 128);
		free(tmp);

		of_explicit_memset(buffer, 0,
		    parallelization * 128 * blockSize);
		free(buffer);

		[HMAC release];
	}
}