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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)
/* Check defined here and executed in of_scrypt() */
/* Check defined here and executed in OFScrypt() */
#define OVERFLOW_CHECK_1 \
if (param.blockSize > SIZE_MAX / 2 || \
2 * param.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);
OFSalsa20_8Core(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,
/* Check defined here and executed in of_scrypt() */
/* Check defined here and executed in OFScrypt() */
#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++) {
memcpy(tmp2 + i * 32 * blockSize, tmp, 128 * blockSize);
of_scrypt_block_mix(tmp, tmp2 + i * 32 * blockSize, blockSize);
OFScryptBlockMix(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);
OFScryptBlockMix(buffer, tmp, blockSize);
if (i < costFactor - 1)
memcpy(tmp, buffer, 128 * blockSize);
}
}
void
of_scrypt(of_scrypt_parameters_t param)
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.key = (unsigned char *)bufferItems,
.keyLength = param.parallelization * 128 *
param.blockSize,
.allowsSwappableMemory = param.allowsSwappableMemory
});
for (size_t i = 0; i < param.parallelization; i++)
of_scrypt_romix(bufferItems + i * 32 * param.blockSize,
OFScryptROMix(bufferItems + i * 32 * param.blockSize,
param.blockSize, param.costFactor, tmpItems);
OFPBKDF2((OFPBKDF2Parameters){
.HMAC = HMAC,
.iterations = 1,
.salt = (unsigned char *)bufferItems,
.saltLength = param.parallelization * 128 *
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