/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
* Jonathan Schleifer <js@webkeks.org>
*
* 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"
#include <string.h>
#import "OFSHA1Hash.h"
#import "OFHashAlreadyCalculatedException.h"
#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
uint_fast8_t i;
for (i = 0; i < length; i++)
vector[i] = OF_BSWAP32(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);
}
#define LOOP_BODY(f, k) \
{ \
uint32_t tmp = OF_ROL(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[1] = new[0]; \
new[0] = tmp; \
}
for (i = 0; i < 20; i++)
LOOP_BODY(F, 0x5A827999)
for (; i < 40; i++)
LOOP_BODY(G, 0x6ED9EBA1)
for (; i < 60; i++)
LOOP_BODY(H, 0x8F1BBCDC)
for (; i < 80; i++)
LOOP_BODY(I, 0xCA62C1D6)
#undef LOOP_BODY
state[0] += new[0];
state[1] += new[1];
state[2] += new[2];
state[3] += new[3];
state[4] += new[4];
}
@implementation OFSHA1Hash
+ (size_t)digestSize
{
return 20;
}
+ (size_t)blockSize
{
return 64;
}
+ (instancetype)hash
{
return [[[self alloc] init] autorelease];
}
- init
{
self = [super init];
[self OF_resetState];
return self;
}
- (void)OF_resetState
{
_state[0] = 0x67452301;
_state[1] = 0xEFCDAB89;
_state[2] = 0x98BADCFE;
_state[3] = 0x10325476;
_state[4] = 0xC3D2E1F0;
}
- (void)updateWithBuffer: (const void*)buffer_
length: (size_t)length
{
const uint8_t *buffer = buffer_;
if (_calculated)
@throw [OFHashAlreadyCalculatedException
exceptionWithHash: self];
_bits += (length * 8);
while (length > 0) {
size_t min = 64 - _bufferLength;
if (min > length)
min = length;
memcpy(_buffer.bytes + _bufferLength, buffer, min);
_bufferLength += min;
buffer += min;
length -= min;
if (_bufferLength == 64) {
processBlock(_state, _buffer.words);
_bufferLength = 0;
}
}
}
- (const uint8_t*)digest
{
if (_calculated)
return (const uint8_t*)_state;
_buffer.bytes[_bufferLength] = 0x80;
memset(_buffer.bytes + _bufferLength + 1, 0, 64 - _bufferLength - 1);
if (_bufferLength >= 56) {
processBlock(_state, _buffer.words);
memset(_buffer.bytes, 0, 64);
}
_buffer.words[14] = OF_BSWAP32_IF_LE((uint32_t)(_bits >> 32));
_buffer.words[15] = OF_BSWAP32_IF_LE((uint32_t)(_bits & 0xFFFFFFFF));
processBlock(_state, _buffer.words);
memset(&_buffer, 0, sizeof(_buffer));
byteSwapVectorIfLE(_state, 5);
_calculated = true;
return (const uint8_t*)_state;
}
- (bool)isCalculated
{
return _calculated;
}
- (void)reset
{
[self OF_resetState];
_bits = 0;
memset(&_buffer, 0, sizeof(_buffer));
_bufferLength = 0;
_calculated = false;
}
@end