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#import "OFHashAlreadyCalculatedException.h"
#import "OFInvalidArgumentException.h"
@implementation OFHMAC
@synthesize hashClass = _hashClass;
@synthesize allowsSwappableMemory = _allowsSwappableMemory;
+ (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)class
allowsSwappableMemory: (bool)allowsSwappableMemory
{
return [[[self alloc] initWithHashClass: class
allowsSwappableMemory: allowsSwappableMemory]
autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithHashClass: (Class <OFCryptoHash>)class
allowsSwappableMemory: (bool)allowsSwappableMemory
{
self = [super init];
_hashClass = class;
_allowsSwappableMemory = allowsSwappableMemory;
return self;
}
- (void)dealloc
{
[_outerHash release];
[_innerHash release];
[_outerHashCopy release];
[_innerHashCopy release];
[super dealloc];
}
- (void)setKey: (const void *)key
length: (size_t)length
{
void *pool = objc_autoreleasePoolPush();
size_t blockSize = [_hashClass blockSize];
OFSecureData *outerKeyPad = [OFSecureData
dataWithCount: blockSize
allowsSwappableMemory: _allowsSwappableMemory];
OFSecureData *innerKeyPad = [OFSecureData
dataWithCount: blockSize
allowsSwappableMemory: _allowsSwappableMemory];
unsigned char *outerKeyPadItems = outerKeyPad.mutableItems;
unsigned char *innerKeyPadItems = innerKeyPad.mutableItems;
[_outerHash release];
[_innerHash release];
[_outerHashCopy release];
[_innerHashCopy release];
_outerHash = _innerHash = _outerHashCopy = _innerHashCopy = nil;
@try {
if (length > blockSize) {
id <OFCryptoHash> hash = [_hashClass
cryptoHashWithAllowsSwappableMemory:
_allowsSwappableMemory];
length: length];
_outerHash = [[_hashClass cryptoHashWithAllowsSwappableMemory:
_allowsSwappableMemory] retain];
_innerHash = [[_hashClass cryptoHashWithAllowsSwappableMemory:
_allowsSwappableMemory] retain];
[_outerHash updateWithBuffer: outerKeyPadItems
length: blockSize];
[_innerHash updateWithBuffer: innerKeyPadItems
length: blockSize];
} @catch (id e) {
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#import "OFHashAlreadyCalculatedException.h"
#import "OFInvalidArgumentException.h"
@implementation OFHMAC
@synthesize hashClass = _hashClass;
@synthesize allowsSwappableMemory = _allowsSwappableMemory;
+ (instancetype)HMACWithHashClass: (Class <OFCryptographicHash>)class
allowsSwappableMemory: (bool)allowsSwappableMemory
{
return [[[self alloc] initWithHashClass: class
allowsSwappableMemory: allowsSwappableMemory]
autorelease];
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (instancetype)initWithHashClass: (Class <OFCryptographicHash>)class
allowsSwappableMemory: (bool)allowsSwappableMemory
{
self = [super init];
_hashClass = class;
_allowsSwappableMemory = allowsSwappableMemory;
return self;
}
- (void)dealloc
{
[_outerHash release];
[_innerHash release];
[_outerHashCopy release];
[_innerHashCopy release];
[super dealloc];
}
- (void)setKey: (const void *)key length: (size_t)length
{
void *pool = objc_autoreleasePoolPush();
size_t blockSize = [_hashClass blockSize];
OFSecureData *outerKeyPad = [OFSecureData
dataWithCount: blockSize
allowsSwappableMemory: _allowsSwappableMemory];
OFSecureData *innerKeyPad = [OFSecureData
dataWithCount: blockSize
allowsSwappableMemory: _allowsSwappableMemory];
unsigned char *outerKeyPadItems = outerKeyPad.mutableItems;
unsigned char *innerKeyPadItems = innerKeyPad.mutableItems;
[_outerHash release];
[_innerHash release];
[_outerHashCopy release];
[_innerHashCopy release];
_outerHash = _innerHash = _outerHashCopy = _innerHashCopy = nil;
@try {
if (length > blockSize) {
id <OFCryptographicHash> hash = [_hashClass
hashWithAllowsSwappableMemory:
_allowsSwappableMemory];
[hash updateWithBuffer: key length: length];
length = hash.digestSize;
if OF_UNLIKELY (length > blockSize)
length = blockSize;
memcpy(outerKeyPadItems, hash.digest, length);
memcpy(innerKeyPadItems, hash.digest, length);
} else {
memcpy(outerKeyPadItems, key, length);
memcpy(innerKeyPadItems, key, length);
}
memset(outerKeyPadItems + length, 0, blockSize - length);
memset(innerKeyPadItems + length, 0, blockSize - length);
for (size_t i = 0; i < blockSize; i++) {
outerKeyPadItems[i] ^= 0x5C;
innerKeyPadItems[i] ^= 0x36;
}
_outerHash = [[_hashClass hashWithAllowsSwappableMemory:
_allowsSwappableMemory] retain];
_innerHash = [[_hashClass hashWithAllowsSwappableMemory:
_allowsSwappableMemory] retain];
[_outerHash updateWithBuffer: outerKeyPadItems
length: blockSize];
[_innerHash updateWithBuffer: innerKeyPadItems
length: blockSize];
} @catch (id e) {
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_outerHashCopy = [_outerHash copy];
_innerHashCopy = [_innerHash copy];
_calculated = false;
}
- (void)updateWithBuffer: (const void *)buffer
length: (size_t)length
{
if (_innerHash == nil)
@throw [OFInvalidArgumentException exception];
if (_calculated)
@throw [OFHashAlreadyCalculatedException
exceptionWithObject: self];
[_innerHash updateWithBuffer: buffer
length: length];
}
- (const unsigned char *)digest
{
if (_outerHash == nil || _innerHash == nil)
@throw [OFInvalidArgumentException exception];
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_outerHashCopy = [_outerHash copy];
_innerHashCopy = [_innerHash copy];
_calculated = false;
}
- (void)updateWithBuffer: (const void *)buffer length: (size_t)length
{
if (_innerHash == nil)
@throw [OFInvalidArgumentException exception];
if (_calculated)
@throw [OFHashAlreadyCalculatedException
exceptionWithObject: self];
[_innerHash updateWithBuffer: buffer length: length];
}
- (const unsigned char *)digest
{
if (_outerHash == nil || _innerHash == nil)
@throw [OFInvalidArgumentException exception];
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