ObjFW  Diff

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

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

void
of_salsa20_8_core(uint32_t buffer[16])
OFSalsa20_8Core(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) {
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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)
OFScryptBlockMix(uint32_t *output, const uint32_t *input, size_t blockSize)
{
	uint32_t tmp[16];

	/* 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,
OFScryptROMix(uint32_t *buffer, size_t blockSize, size_t costFactor,
    uint32_t *tmp)
{
	/* 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)
OFScrypt(OFScryptParameters param)
{
	OFSecureData *tmp = nil, *buffer = nil;
	OFHMAC *HMAC = nil;

	if (param.blockSize == 0 || param.costFactor <= 1 ||
	    (param.costFactor & (param.costFactor - 1)) != 0 ||
	    param.parallelization == 0)
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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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