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*/
#include "config.h"
#include <string.h>
#import "OFMD5Hash.h"
#import "OFHashAlreadyCalculatedException.h"
@interface OFMD5Hash ()
- (void)of_resetState;
@end
#define F(a, b, c) (((a) & (b)) | (~(a) & (c)))
#define G(a, b, c) (((a) & (c)) | ((b) & ~(c)))
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*/
#include "config.h"
#include <string.h>
#import "OFMD5Hash.h"
#import "OFSecureData.h"
#import "OFHashAlreadyCalculatedException.h"
#import "OFOutOfRangeException.h"
@interface OFMD5Hash ()
- (void)of_resetState;
@end
#define F(a, b, c) (((a) & (b)) | (~(a) & (c)))
#define G(a, b, c) (((a) & (c)) | ((b) & ~(c)))
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5, 9, 14, 20,
4, 11, 16, 23,
6, 10, 15, 21
};
static OF_INLINE void
byteSwapVectorIfBE(uint32_t *vector, uint8_t length)
{
#ifdef OF_BIG_ENDIAN
for (uint8_t 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];
uint8_t i = 0;
new[0] = state[0];
new[1] = state[1];
new[2] = state[2];
new[3] = state[3];
byteSwapVectorIfBE(buffer, 16);
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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
for (uint_fast8_t 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);
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return [[[self alloc] init] autorelease];
}
- (instancetype)init
{
self = [super init];
[self of_resetState];
return self;
}
- (void)dealloc
{
[self reset];
[super dealloc];
}
- (id)copy
{
OFMD5Hash *copy = [[OFMD5Hash alloc] init];
memcpy(copy->_state, _state, sizeof(_state));
copy->_bits = _bits;
memcpy(©->_buffer, &_buffer, sizeof(_buffer));
copy->_bufferLength = _bufferLength;
_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
exceptionWithObject: 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 unsigned char *)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;
}
- (void)reset
{
[self of_resetState];
_bits = 0;
memset(&_buffer, 0, sizeof(_buffer));
_bufferLength = 0;
_calculated = false;
}
@end
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return [[[self alloc] init] autorelease];
}
- (instancetype)init
{
self = [super init];
@try {
_iVarsData = [[OFSecureData alloc]
initWithCount: sizeof(*_iVars)];
_iVars = [_iVarsData items];
[self of_resetState];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (instancetype)of_init
{
return [super init];
}
- (void)dealloc
{
[_iVarsData release];
[super dealloc];
}
- (id)copy
{
OFMD5Hash *copy = [[OFMD5Hash alloc] of_init];
copy->_iVarsData = [_iVarsData copy];
copy->_iVars = [copy->_iVarsData items];
copy->_calculated = _calculated;
return copy;
}
- (void)of_resetState
{
_iVars->state[0] = 0x67452301;
_iVars->state[1] = 0xEFCDAB89;
_iVars->state[2] = 0x98BADCFE;
_iVars->state[3] = 0x10325476;
}
- (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)
return (const unsigned char *)_iVars->state;
_iVars->buffer.bytes[_iVars->bufferLength] = 0x80;
of_explicit_memset(_iVars->buffer.bytes + _iVars->bufferLength + 1, 0,
64 - _iVars->bufferLength - 1);
if (_iVars->bufferLength >= 56) {
processBlock(_iVars->state, _iVars->buffer.words);
of_explicit_memset(_iVars->buffer.bytes, 0, 64);
}
_iVars->buffer.words[14] =
OF_BSWAP32_IF_BE((uint32_t)(_iVars->bits & 0xFFFFFFFF));
_iVars->buffer.words[15] =
OF_BSWAP32_IF_BE((uint32_t)(_iVars->bits >> 32));
processBlock(_iVars->state, _iVars->buffer.words);
of_explicit_memset(&_iVars->buffer, 0, sizeof(_iVars->buffer));
byteSwapVectorIfBE(_iVars->state, 4);
_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));
_iVars->bufferLength = 0;
_calculated = false;
}
@end
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