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}
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) \
#define OVERFLOW_CHECK_2 \
if (param.blockSize > SIZE_MAX / 128 / param.costFactor) \
@throw [OFOutOfRangeException exception];
uint32_t *tmp2 = tmp + 32 * blockSize;
memcpy(tmp, buffer, 128 * blockSize);
for (size_t i = 0; i < costFactor; i++) {
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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,
void
of_scrypt(of_scrypt_parameters_t param)
const char *password, size_t passwordLength,
unsigned char *key, size_t keyLength, bool allowsSwappableMemory)
if (blockSize == 0 || costFactor <= 1 ||
(costFactor & (costFactor - 1)) != 0 || parallelization == 0)
if (param.blockSize == 0 || param.costFactor <= 1 ||
(param.costFactor & (param.costFactor - 1)) != 0 ||
param.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 {
uint32_t *tmpItems, *bufferItems;
if (costFactor > SIZE_MAX - 1 ||
(costFactor + 1) > SIZE_MAX / 128)
if (param.costFactor > SIZE_MAX - 1 ||
(param.costFactor + 1) > SIZE_MAX / 128)
@throw [OFOutOfRangeException exception];
tmp = [[OFSecureData alloc]
initWithItemSize: blockSize
count: (costFactor + 1) * 128
allowsSwappableMemory: allowsSwappableMemory];
initWithItemSize: param.blockSize
count: (param.costFactor + 1) * 128
allowsSwappableMemory: param.allowsSwappableMemory];
tmpItems = tmp.mutableItems;
if (parallelization > SIZE_MAX / 128)
if (param.parallelization > SIZE_MAX / 128)
@throw [OFOutOfRangeException exception];
buffer = [[OFSecureData alloc]
initWithItemSize: blockSize
count: parallelization * 128
allowsSwappableMemory: allowsSwappableMemory];
initWithItemSize: param.blockSize
count: param.parallelization * 128
allowsSwappableMemory: param.allowsSwappableMemory];
bufferItems = buffer.mutableItems;
HMAC = [[OFHMAC alloc]
initWithHashClass: [OFSHA256Hash class]
allowsSwappableMemory: allowsSwappableMemory];
allowsSwappableMemory: param.allowsSwappableMemory];
of_pbkdf2((of_pbkdf2_parameters_t){
.HMAC = HMAC,
.iterations = 1,
.salt = salt,
.saltLength = saltLength,
.password = password,
.passwordLength = passwordLength,
.key = (unsigned char *)bufferItems,
.keyLength = parallelization * 128 * blockSize,
.allowsSwappableMemory = allowsSwappableMemory
.HMAC = HMAC,
.iterations = 1,
.salt = param.salt,
.saltLength = param.saltLength,
.password = param.password,
.passwordLength = param.passwordLength,
.key = (unsigned char *)bufferItems,
.keyLength = param.parallelization * 128 *
param.blockSize,
.allowsSwappableMemory = param.allowsSwappableMemory
});
for (size_t i = 0; i < parallelization; i++)
of_scrypt_romix(bufferItems + i * 32 * blockSize,
blockSize, costFactor, tmpItems);
for (size_t i = 0; i < param.parallelization; i++)
of_scrypt_romix(bufferItems + i * 32 * param.blockSize,
param.blockSize, param.costFactor, tmpItems);
of_pbkdf2((of_pbkdf2_parameters_t){
.HMAC = HMAC,
.iterations = 1,
.salt = (unsigned char *)bufferItems,
.saltLength = parallelization * 128 * blockSize,
.password = password,
.passwordLength = passwordLength,
.key = key,
.keyLength = keyLength,
.allowsSwappableMemory = allowsSwappableMemory
.HMAC = HMAC,
.iterations = 1,
.salt = (unsigned char *)bufferItems,
.saltLength = param.parallelization * 128 *
param.blockSize,
.password = param.password,
.passwordLength = param.passwordLength,
.key = param.key,
.keyLength = param.keyLength,
.allowsSwappableMemory = param.allowsSwappableMemory
});
} @finally {
[tmp release];
[buffer release];
[HMAC release];
}
}
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