ObjFW  Diff

#import "OFSHA1Hash.h"
#import "OFSecureData.h"

#import "OFHashAlreadyCalculatedException.h"
#import "OFOutOfRangeException.h"

#define DIGEST_SIZE 20
#define BLOCK_SIZE 64
static const size_t digestSize = 20;
static const size_t blockSize = 64;

OF_DIRECT_MEMBERS
@interface OFSHA1Hash ()
- (void)of_resetState;
@end

#define F(a, b, c, d) ((d) ^ ((b) & ((c) ^ (d))))
#define G(a, b, c, d) ((b) ^ (c) ^ (d))
#define H(a, b, c, d) (((b) & (c)) | ((d) & ((b) | (c))))
#define I(a, b, c, d) ((b) ^ (c) ^ (d))

static OF_INLINE void
byteSwapVectorIfLE(uint32_t *vector, uint_fast8_t length)
{
#ifndef OF_BIG_ENDIAN
	for (uint_fast8_t i = 0; i < length; i++)
		vector[i] = OF_BSWAP32(vector[i]);
		vector[i] = OFByteSwap32(vector[i]);
#endif
}

static void
processBlock(uint32_t *state, uint32_t *buffer)
{
	uint32_t new[5];
	uint_fast8_t i;

	new[0] = state[0];
	new[1] = state[1];
	new[2] = state[2];
	new[3] = state[3];
	new[4] = state[4];

	byteSwapVectorIfLE(buffer, 16);

	for (i = 16; i < 80; i++) {
		uint32_t tmp = buffer[i - 3] ^ buffer[i - 8] ^
		    buffer[i - 14] ^ buffer[i - 16];
		buffer[i] = OF_ROL(tmp, 1);
		buffer[i] = OFRotateLeft(tmp, 1);
	}

#define LOOP_BODY(f, k)							\
	{								\
		uint32_t tmp = OF_ROL(new[0], 5) +			\
		uint32_t tmp = OFRotateLeft(new[0], 5) +		\
		    f(new[0], new[1], new[2], new[3]) +			\
		    new[4] + k + buffer[i];				\
		new[4] = new[3];					\
		new[3] = new[2];					\
		new[2] = OF_ROL(new[1], 30);				\
		new[2] = OFRotateLeft(new[1], 30);			\
		new[1] = new[0];					\
		new[0] = tmp;						\
	}

	for (i = 0; i < 20; i++)
		LOOP_BODY(F, 0x5A827999)
	for (; i < 40; i++)

@implementation OFSHA1Hash
@synthesize calculated = _calculated;
@synthesize allowsSwappableMemory = _allowsSwappableMemory;

+ (size_t)digestSize
{
	return DIGEST_SIZE;
	return digestSize;
}

+ (size_t)blockSize
{
	return BLOCK_SIZE;
	return blockSize;
}

+ (instancetype)cryptoHashWithAllowsSwappableMemory: (bool)allowsSwappableMemory
+ (instancetype)hashWithAllowsSwappableMemory: (bool)allowsSwappableMemory
{
	return [[[self alloc] initWithAllowsSwappableMemory:
	    allowsSwappableMemory] autorelease];
}

- (instancetype)initWithAllowsSwappableMemory: (bool)allowsSwappableMemory
{

	[_iVarsData release];

	[super dealloc];
}

- (size_t)digestSize
{
	return DIGEST_SIZE;
	return digestSize;
}

- (size_t)blockSize
{
	return BLOCK_SIZE;
	return blockSize;
}

- (id)copy
{
	OFSHA1Hash *copy = [[OFSHA1Hash alloc] of_init];

	copy->_iVarsData = [_iVarsData copy];

	_iVars->state[0] = 0x67452301;
	_iVars->state[1] = 0xEFCDAB89;
	_iVars->state[2] = 0x98BADCFE;
	_iVars->state[3] = 0x10325476;
	_iVars->state[4] = 0xC3D2E1F0;
}

- (void)updateWithBuffer: (const void *)buffer_
- (void)updateWithBuffer: (const void *)buffer_ length: (size_t)length
		  length: (size_t)length
{
	const unsigned char *buffer = buffer_;

	if (_calculated)
		@throw [OFHashAlreadyCalculatedException
		    exceptionWithObject: self];

- (const unsigned char *)digest
{
	if (_calculated)
		return (const unsigned char *)_iVars->state;

	_iVars->buffer.bytes[_iVars->bufferLength] = 0x80;
	of_explicit_memset(_iVars->buffer.bytes + _iVars->bufferLength + 1, 0,
	OFZeroMemory(_iVars->buffer.bytes + _iVars->bufferLength + 1,
	    64 - _iVars->bufferLength - 1);

	if (_iVars->bufferLength >= 56) {
		processBlock(_iVars->state, _iVars->buffer.words);
		of_explicit_memset(_iVars->buffer.bytes, 0, 64);
		OFZeroMemory(_iVars->buffer.bytes, 64);
	}

	_iVars->buffer.words[14] =
	    OF_BSWAP32_IF_LE((uint32_t)(_iVars->bits >> 32));
	    OFToBigEndian32((uint32_t)(_iVars->bits >> 32));
	_iVars->buffer.words[15] =
	    OF_BSWAP32_IF_LE((uint32_t)(_iVars->bits & 0xFFFFFFFF));
	    OFToBigEndian32((uint32_t)(_iVars->bits & 0xFFFFFFFF));

	processBlock(_iVars->state, _iVars->buffer.words);
	of_explicit_memset(&_iVars->buffer, 0, sizeof(_iVars->buffer));
	OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer));
	byteSwapVectorIfLE(_iVars->state, 5);
	_calculated = true;

	return (const unsigned char *)_iVars->state;
}

- (void)reset
{
	[self of_resetState];
	_iVars->bits = 0;
	of_explicit_memset(&_iVars->buffer, 0, sizeof(_iVars->buffer));
	OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer));
	_iVars->bufferLength = 0;
	_calculated = false;
}
@end