/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#import "OFSHA224Or256Hash.h"
#import "OFSecureData.h"
#import "OFHashAlreadyCalculatedException.h"
#import "OFHashNotCalculatedException.h"
#import "OFOutOfRangeException.h"
static const size_t blockSize = 64;
@interface OFSHA224Or256Hash ()
- (void)of_resetState;
@end
static const uint32_t table[] = {
0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
};
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] = OFByteSwap32(vector[i]);
#endif
}
static void
processBlock(uint32_t *state, uint32_t *buffer)
{
uint32_t new[8];
uint_fast8_t i;
new[0] = state[0];
new[1] = state[1];
new[2] = state[2];
new[3] = state[3];
new[4] = state[4];
new[5] = state[5];
new[6] = state[6];
new[7] = state[7];
byteSwapVectorIfLE(buffer, 16);
for (i = 16; i < 64; i++) {
uint32_t tmp;
tmp = buffer[i - 2];
buffer[i] = (OFRotateRight(tmp, 17) ^ OFRotateRight(tmp, 19) ^
(tmp >> 10)) + buffer[i - 7];
tmp = buffer[i - 15];
buffer[i] += (OFRotateRight(tmp, 7) ^ OFRotateRight(tmp, 18) ^
(tmp >> 3)) + buffer[i - 16];
}
for (i = 0; i < 64; i++) {
uint32_t tmp1 = new[7] + (OFRotateRight(new[4], 6) ^
OFRotateRight(new[4], 11) ^ OFRotateRight(new[4], 25)) +
((new[4] & (new[5] ^ new[6])) ^ new[6]) +
table[i] + buffer[i];
uint32_t tmp2 = (OFRotateRight(new[0], 2) ^
OFRotateRight(new[0], 13) ^ OFRotateRight(new[0], 22)) +
((new[0] & (new[1] | new[2])) | (new[1] & new[2]));
new[7] = new[6];
new[6] = new[5];
new[5] = new[4];
new[4] = new[3] + tmp1;
new[3] = new[2];
new[2] = new[1];
new[1] = new[0];
new[0] = tmp1 + tmp2;
}
state[0] += new[0];
state[1] += new[1];
state[2] += new[2];
state[3] += new[3];
state[4] += new[4];
state[5] += new[5];
state[6] += new[6];
state[7] += new[7];
}
@implementation OFSHA224Or256Hash
@synthesize calculated = _calculated;
@synthesize allowsSwappableMemory = _allowsSwappableMemory;
+ (size_t)digestSize
{
OF_UNRECOGNIZED_SELECTOR
}
+ (size_t)blockSize
{
return blockSize;
}
+ (instancetype)hashWithAllowsSwappableMemory: (bool)allowsSwappableMemory
{
return [[[self alloc] initWithAllowsSwappableMemory:
allowsSwappableMemory] autorelease];
}
- (instancetype)initWithAllowsSwappableMemory: (bool)allowsSwappableMemory
{
self = [super init];
@try {
_iVarsData = [[OFSecureData alloc]
initWithCount: sizeof(*_iVars)
allowsSwappableMemory: allowsSwappableMemory];
_iVars = _iVarsData.mutableItems;
_allowsSwappableMemory = allowsSwappableMemory;
if (self.class == [OFSHA224Or256Hash class]) {
[self doesNotRecognizeSelector: _cmd];
abort();
}
[self of_resetState];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)of_init
{
return [super init];
}
- (void)dealloc
{
[_iVarsData release];
[super dealloc];
}
- (size_t)digestSize
{
OF_UNRECOGNIZED_SELECTOR
}
- (size_t)blockSize
{
return blockSize;
}
- (id)copy
{
OFSHA224Or256Hash *copy = [[[self class] alloc] of_init];
copy->_iVarsData = [_iVarsData copy];
copy->_iVars = copy->_iVarsData.mutableItems;
copy->_allowsSwappableMemory = _allowsSwappableMemory;
copy->_calculated = _calculated;
return copy;
}
- (void)updateWithBuffer: (const void *)buffer_ length: (size_t)length
{
const unsigned char *buffer = buffer_;
if (_calculated)
@throw [OFHashAlreadyCalculatedException
exceptionWithObject: self];
if (length > SIZE_MAX / 8)
@throw [OFOutOfRangeException exception];
_iVars->bits += (length * 8);
while (length > 0) {
size_t min = 64 - _iVars->bufferLength;
if (min > length)
min = length;
memcpy(_iVars->buffer.bytes + _iVars->bufferLength,
buffer, min);
_iVars->bufferLength += min;
buffer += min;
length -= min;
if (_iVars->bufferLength == 64) {
processBlock(_iVars->state, _iVars->buffer.words);
_iVars->bufferLength = 0;
}
}
}
- (const unsigned char *)digest
{
if (!_calculated)
@throw [OFHashNotCalculatedException exceptionWithObject: self];
return (const unsigned char *)_iVars->state;
}
- (void)calculate
{
if (_calculated)
@throw [OFHashAlreadyCalculatedException
exceptionWithObject: self];
_iVars->buffer.bytes[_iVars->bufferLength] = 0x80;
OFZeroMemory(_iVars->buffer.bytes + _iVars->bufferLength + 1,
64 - _iVars->bufferLength - 1);
if (_iVars->bufferLength >= 56) {
processBlock(_iVars->state, _iVars->buffer.words);
OFZeroMemory(_iVars->buffer.bytes, 64);
}
_iVars->buffer.words[14] =
OFToBigEndian32((uint32_t)(_iVars->bits >> 32));
_iVars->buffer.words[15] =
OFToBigEndian32((uint32_t)(_iVars->bits & 0xFFFFFFFF));
processBlock(_iVars->state, _iVars->buffer.words);
OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer));
byteSwapVectorIfLE(_iVars->state, 8);
_calculated = true;
}
- (void)reset
{
[self of_resetState];
_iVars->bits = 0;
OFZeroMemory(&_iVars->buffer, sizeof(_iVars->buffer));
_iVars->bufferLength = 0;
_calculated = false;
}
- (void)of_resetState
{
OF_UNRECOGNIZED_SELECTOR
}
@end