/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
* 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"
void
of_salsa20_8_core(uint32_t buffer[16])
{
uint32_t tmp[16];
for (uint_fast8_t i = 0; i < 16; i++)
tmp[i] = OF_BSWAP32_IF_BE(buffer[i]);
for (uint_fast8_t i = 0; i < 8; i+= 2) {
tmp[ 4] ^= OF_ROL(tmp[ 0] + tmp[12], 7);
tmp[ 8] ^= OF_ROL(tmp[ 4] + tmp[ 0], 9);
tmp[12] ^= OF_ROL(tmp[ 8] + tmp[ 4], 13);
tmp[ 0] ^= OF_ROL(tmp[12] + tmp[ 8], 18);
tmp[ 9] ^= OF_ROL(tmp[ 5] + tmp[ 1], 7);
tmp[13] ^= OF_ROL(tmp[ 9] + tmp[ 5], 9);
tmp[ 1] ^= OF_ROL(tmp[13] + tmp[ 9], 13);
tmp[ 5] ^= OF_ROL(tmp[ 1] + tmp[13], 18);
tmp[14] ^= OF_ROL(tmp[10] + tmp[ 6], 7);
tmp[ 2] ^= OF_ROL(tmp[14] + tmp[10], 9);
tmp[ 6] ^= OF_ROL(tmp[ 2] + tmp[14], 13);
tmp[10] ^= OF_ROL(tmp[ 6] + tmp[ 2], 18);
tmp[ 3] ^= OF_ROL(tmp[15] + tmp[11], 7);
tmp[ 7] ^= OF_ROL(tmp[ 3] + tmp[15], 9);
tmp[11] ^= OF_ROL(tmp[ 7] + tmp[ 3], 13);
tmp[15] ^= OF_ROL(tmp[11] + tmp[ 7], 18);
tmp[ 1] ^= OF_ROL(tmp[ 0] + tmp[ 3], 7);
tmp[ 2] ^= OF_ROL(tmp[ 1] + tmp[ 0], 9);
tmp[ 3] ^= OF_ROL(tmp[ 2] + tmp[ 1], 13);
tmp[ 0] ^= OF_ROL(tmp[ 3] + tmp[ 2], 18);
tmp[ 6] ^= OF_ROL(tmp[ 5] + tmp[ 4], 7);
tmp[ 7] ^= OF_ROL(tmp[ 6] + tmp[ 5], 9);
tmp[ 4] ^= OF_ROL(tmp[ 7] + tmp[ 6], 13);
tmp[ 5] ^= OF_ROL(tmp[ 4] + tmp[ 7], 18);
tmp[11] ^= OF_ROL(tmp[10] + tmp[ 9], 7);
tmp[ 8] ^= OF_ROL(tmp[11] + tmp[10], 9);
tmp[ 9] ^= OF_ROL(tmp[ 8] + tmp[11], 13);
tmp[10] ^= OF_ROL(tmp[ 9] + tmp[ 8], 18);
tmp[12] ^= OF_ROL(tmp[15] + tmp[14], 7);
tmp[13] ^= OF_ROL(tmp[12] + tmp[15], 9);
tmp[14] ^= OF_ROL(tmp[13] + tmp[12], 13);
tmp[15] ^= OF_ROL(tmp[14] + tmp[13], 18);
}
for (uint_fast8_t i = 0; i < 16; i++)
buffer[i] = OF_BSWAP32_IF_BE(OF_BSWAP32_IF_BE(buffer[i]) +
tmp[i]);
of_explicit_memset(tmp, 0, sizeof(tmp));
}
void
of_scrypt_block_mix(uint32_t *output, const uint32_t *input, size_t blockSize)
{
uint32_t tmp[16];
/* Check defined here and executed in of_scrypt() */
#define OVERFLOW_CHECK_1 \
if (blockSize > SIZE_MAX / 2 || \
2 * blockSize - 1 > SIZE_MAX / 16) \
@throw [OFOutOfRangeException exception];
memcpy(tmp, input + (2 * blockSize - 1) * 16, 64);
for (size_t i = 0; i < 2 * blockSize; i++) {
for (size_t j = 0; j < 16; j++)
tmp[j] ^= input[i * 16 + j];
of_salsa20_8_core(tmp);
/*
* Even indices are stored in the first half and odd ones in
* the second.
*/
memcpy(output + ((i / 2) + (i & 1) * blockSize) * 16, tmp, 64);
}
of_explicit_memset(tmp, 0, sizeof(tmp));
}
void
of_scrypt_romix(uint32_t *buffer, size_t blockSize, size_t costFactor,
uint32_t *tmp)
{
/* Check defined here and executed in of_scrypt() */
#define OVERFLOW_CHECK_2 \
if (blockSize > SIZE_MAX / 128 / costFactor) \
@throw [OFOutOfRangeException exception];
uint32_t *tmp2 = tmp + 32 * blockSize;
memcpy(tmp, buffer, 128 * blockSize);
for (size_t i = 0; i < costFactor; i++) {
memcpy(tmp2 + i * 32 * blockSize, tmp, 128 * blockSize);
of_scrypt_block_mix(tmp, tmp2 + i * 32 * blockSize, blockSize);
}
for (size_t i = 0; i < costFactor; i++) {
uint32_t j = OF_BSWAP32_IF_BE(tmp[(2 * blockSize - 1) * 16]) &
(costFactor - 1);
for (size_t k = 0; k < 32 * blockSize; k++)
tmp[k] ^= tmp2[j * 32 * blockSize + k];
of_scrypt_block_mix(buffer, tmp, blockSize);
if (i < costFactor - 1)
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];
}
}