/*
* 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 "OFMD5Hash.h"
#import "OFHashAlreadyCalculatedException.h"
#define F(a, b, c) (((a) & (b)) | (~(a) & (c)))
#define G(a, b, c) (((a) & (c)) | ((b) & ~(c)))
#define H(a, b, c) ((a) ^ (b) ^ (c))
#define I(a, b, c) ((b) ^ ((a) | ~(c)))
static const uint32_t table[] = {
0xD76AA478, 0xE8C7B756, 0x242070DB, 0xC1BDCEEE,
0xF57C0FAF, 0x4787C62A, 0xA8304613, 0xFD469501,
0x698098D8, 0x8B44F7AF, 0xFFFF5BB1, 0x895CD7BE,
0x6B901122, 0xFD987193, 0xA679438E, 0x49B40821,
0xF61E2562, 0xC040B340, 0x265E5A51, 0xE9B6C7AA,
0xD62F105D, 0x02441453, 0xD8A1E681, 0xE7D3FBC8,
0x21E1CDE6, 0xC33707D6, 0xF4D50D87, 0x455A14ED,
0xA9E3E905, 0xFCEFA3F8, 0x676F02D9, 0x8D2A4C8A,
0xFFFA3942, 0x8771F681, 0x6D9D6122, 0xFDE5380C,
0xA4BEEA44, 0x4BDECFA9, 0xF6BB4B60, 0xBEBFBC70,
0x289B7EC6, 0xEAA127FA, 0xD4EF3085, 0x04881D05,
0xD9D4D039, 0xE6DB99E5, 0x1FA27CF8, 0xC4AC5665,
0xF4292244, 0x432AFF97, 0xAB9423A7, 0xFC93A039,
0x655B59C3, 0x8F0CCC92, 0xFFEFF47D, 0x85845DD1,
0x6FA87E4F, 0xFE2CE6E0, 0xA3014314, 0x4E0811A1,
0xF7537E82, 0xBD3AF235, 0x2AD7D2BB, 0xEB86D391
};
static const uint8_t wordOrder[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12,
5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2,
0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9
};
static const uint8_t rotateBits[] = {
7, 12, 17, 22,
5, 9, 14, 20,
4, 11, 16, 23,
6, 10, 15, 21
};
static OF_INLINE void
byteSwapVectorIfBE(uint32_t *vector, uint_fast8_t length)
{
#ifdef 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[4];
uint_fast8_t i = 0;
new[0] = state[0];
new[1] = state[1];
new[2] = state[2];
new[3] = state[3];
byteSwapVectorIfBE(buffer, 16);
#define LOOP_BODY(f) \
{ \
uint32_t tmp = new[3]; \
tmp = new[3]; \
new[0] += f(new[1], new[2], new[3]) + \
buffer[wordOrder[i]] + table[i]; \
new[3] = new[2]; \
new[2] = new[1]; \
new[1] += OF_ROL(new[0], rotateBits[(i % 4) + (i / 16) * 4]); \
new[0] = tmp;\
}
for (; i < 16; i++)
LOOP_BODY(F)
for (; i < 32; i++)
LOOP_BODY(G)
for (; i < 48; i++)
LOOP_BODY(H)
for (; i < 64; i++)
LOOP_BODY(I)
#undef LOOP_BODY
state[0] += new[0];
state[1] += new[1];
state[2] += new[2];
state[3] += new[3];
}
@implementation OFMD5Hash
+ (size_t)digestSize
{
return 16;
}
+ (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;
}
- (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_BE((uint32_t)(_bits & 0xFFFFFFFF));
_buffer.words[15] = OF_BSWAP32_IF_BE((uint32_t)(_bits >> 32));
processBlock(_state, _buffer.words);
memset(&_buffer, 0, sizeof(_buffer));
byteSwapVectorIfBE(_state, 4);
_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