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* 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.
*/
#import "OFObject.h"
#import "OFCryptoHash.h"
#import "OFCryptographicHash.h"
OF_ASSUME_NONNULL_BEGIN
/**
* @class OFHMAC OFHMAC.h ObjFW/OFHMAC.h
*
* @brief A class which provides methods to calculate an HMAC.
*/
OF_SUBCLASSING_RESTRICTED
@interface OFHMAC: OFObject
{
Class <OFCryptoHash> _hashClass;
Class <OFCryptographicHash> _hashClass;
bool _allowsSwappableMemory;
id <OFCryptoHash> _Nullable _outerHash, _innerHash;
id <OFCryptoHash> _Nullable _outerHashCopy, _innerHashCopy;
id <OFCryptographicHash> _Nullable _outerHash, _innerHash;
id <OFCryptographicHash> _Nullable _outerHashCopy, _innerHashCopy;
bool _calculated;
}
/**
* @brief The class for the cryptographic hash used by the HMAC.
*/
@property (readonly, nonatomic) Class <OFCryptoHash> hashClass;
@property (readonly, nonatomic) Class <OFCryptographicHash> hashClass;
/**
* @brief Whether data may be stored in swappable memory.
*/
@property (readonly, nonatomic) bool allowsSwappableMemory;
/**
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/**
* @brief Returns a new OFHMAC with the specified hashing algorithm.
*
* @param hashClass The class of the hashing algorithm
* @param allowsSwappableMemory Whether data may be stored in swappable memory
* @return A new, autoreleased OFHMAC
*/
+ (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)hashClass
+ (instancetype)HMACWithHashClass: (Class <OFCryptographicHash>)hashClass
allowsSwappableMemory: (bool)allowsSwappableMemory;
- (instancetype)init OF_UNAVAILABLE;
/**
* @brief Initialized an already allocated OFHMAC with the specified hashing
* algorithm.
*
* @param hashClass The class of the hashing algorithm
* @param allowsSwappableMemory Whether data may be stored in swappable memory
* @return An initialized OFHMAC
*/
- (instancetype)initWithHashClass: (Class <OFCryptoHash>)hashClass
- (instancetype)initWithHashClass: (Class <OFCryptographicHash>)hashClass
allowsSwappableMemory: (bool)allowsSwappableMemory
OF_DESIGNATED_INITIALIZER;
/**
* @brief Sets the key for the HMAC.
*
* @note This resets the HMAC!
*
* @warning This invalidates any pointer previously returned by @ref digest. If
* you are still interested in the previous digest, you need to memcpy
* it yourself before calling @ref setKey:length:!
*
* @param key The key for the HMAC
* @param length The length of the key for the HMAC
*/
- (void)setKey: (const void *)key
- (void)setKey: (const void *)key length: (size_t)length;
length: (size_t)length;
- (void)updateWithBuffer: (const void *)buffer
- (void)updateWithBuffer: (const void *)buffer length: (size_t)length;
length: (size_t)length;
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