94 lines
2.5 KiB
Objective-C
94 lines
2.5 KiB
Objective-C
/**
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* Copyright Maarten Billemont (http://www.lhunath.com, lhunath@lyndir.com)
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*
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* See the enclosed file LICENSE for license information (LGPLv3). If you did
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* not receive this file, see http://www.gnu.org/licenses/lgpl-3.0.txt
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*
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* @author Maarten Billemont <lhunath@lyndir.com>
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* @license http://www.gnu.org/licenses/lgpl-3.0.txt
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*/
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//
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// MPKey
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//
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// Created by Maarten Billemont on 16/07/12.
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// Copyright 2012 lhunath (Maarten Billemont). All rights reserved.
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//
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#import "MPAlgorithm.h"
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@interface MPKey()
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@property(nonatomic) MPKeyOrigin origin;
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@property(nonatomic, copy) NSString *fullName;
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@property(nonatomic, copy) NSData *( ^keyResolver )(id<MPAlgorithm>);
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@end
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@implementation MPKey {
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NSCache *_keyCache;
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};
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- (instancetype)initForFullName:(NSString *)fullName withMasterPassword:(NSString *)masterPassword {
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return [self initForFullName:fullName withKeyResolver:^NSData *(id<MPAlgorithm> algorithm) {
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return [algorithm keyDataForFullName:self.fullName withMasterPassword:masterPassword];
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} keyOrigin:MPKeyOriginMasterPassword];
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}
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- (instancetype)initForFullName:(NSString *)fullName withKeyResolver:(NSData *( ^ )(id<MPAlgorithm>))keyResolver
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keyOrigin:(MPKeyOrigin)origin {
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if (!(self = [super init]))
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return nil;
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_keyCache = [NSCache new];
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self.origin = origin;
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self.fullName = fullName;
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self.keyResolver = keyResolver;
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return self;
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}
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- (NSData *)keyIDForAlgorithm:(id<MPAlgorithm>)algorithm {
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return [algorithm keyIDForKeyData:[self keyDataForAlgorithm:algorithm]];
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}
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- (NSData *)keyDataForAlgorithm:(id<MPAlgorithm>)algorithm {
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@synchronized (self) {
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NSData *keyData = [_keyCache objectForKey:algorithm];
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if (keyData)
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return keyData;
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keyData = self.keyResolver( algorithm );
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if (keyData)
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[_keyCache setObject:keyData forKey:algorithm];
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return keyData;
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}
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}
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- (NSData *)keyDataForAlgorithm:(id<MPAlgorithm>)algorithm trimmedLength:(NSUInteger)subKeyLength {
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NSData *keyData = [self keyDataForAlgorithm:algorithm];
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return [keyData subdataWithRange:NSMakeRange( 0, MIN( subKeyLength, keyData.length ) )];
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}
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- (BOOL)isEqualToKey:(MPKey *)key {
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return [[self keyIDForAlgorithm:MPAlgorithmDefault] isEqualToData:[key keyIDForAlgorithm:MPAlgorithmDefault]];
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}
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- (BOOL)isEqual:(id)object {
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if (![object isKindOfClass:[MPKey class]])
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return NO;
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return [self isEqualToKey:object];
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}
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@end
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