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#import "OFHMAC.h"
#import "OFHashAlreadyCalculatedException.h"
#import "OFInvalidArgumentException.h"
@implementation OFHMAC
@synthesize hashClass = _hashClass;
+ (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)class
{
return [[[self alloc] initWithHashClass: class] autorelease];
}
- initWithHashClass: (id <OFCryptoHash>)class
- initWithHashClass: (Class <OFCryptoHash>)class
{
self = [super init];
@try {
void *pool = objc_autoreleasePoolPush();
_outerHash = [[class cryptoHash] retain];
_innerHash = [[class cryptoHash] retain];
objc_autoreleasePoolPop(pool);
} @catch (id e) {
[self release];
@throw e;
}
size_t blockSize = [[_outerHash class] blockSize];
size_t blockSize = [_hashClass blockSize];
uint8_t outerKeyPad[blockSize], innerKeyPad[blockSize];
[_outerHash release];
[_innerHash release];
[_outerHashCopy release];
[_innerHashCopy release];
_outerHash = _innerHash = _outerHashCopy = _innerHashCopy = nil;
if (length > blockSize) {
void *pool = objc_autoreleasePoolPush();
id <OFCryptoHash> hash = [[_outerHash class] cryptoHash];
length = [[hash class] digestSize];
length = [_hashClass digestSize];
if OF_UNLIKELY (length > blockSize)
length = blockSize;
memcpy(outerKeyPad, [hash digest], length);
memcpy(innerKeyPad, [hash digest], length);
objc_autoreleasePoolPop(pool);
_keySet = true;
if (!_keySet)
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];
if (_calculated)
return [_outerHash digest];
[_outerHash updateWithBuffer: [_innerHash digest]
length: [[_innerHash class] digestSize]];
length: [_hashClass digestSize]];
_calculated = true;
return [_outerHash digest];
}
- (size_t)digestSize
{
return [[_outerHash class] digestSize];
return [_hashClass digestSize];
}
- (void)reset
{
[_outerHash reset];
[_innerHash reset];
[_outerHash release];
[_innerHash release];
_outerHash = _innerHash = nil;
_outerHash = [_outerHashCopy copy];
_innerHash = [_innerHashCopy copy];
_keySet = false;
|