93 lines
3.7 KiB
Objective-C
93 lines
3.7 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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// MPAlgorithmV1
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//
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// Created by Maarten Billemont on 17/07/12.
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// Copyright 2012 lhunath (Maarten Billemont). All rights reserved.
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//
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#import "MPAlgorithmV1.h"
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#import "MPEntities.h"
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@implementation MPAlgorithmV1
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- (NSUInteger)version {
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return 1;
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}
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- (BOOL)migrateElement:(MPElementEntity *)element explicit:(BOOL)explicit {
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if (element.version != [self version] - 1)
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// Only migrate from previous version.
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return NO;
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if (!explicit) {
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if (element.type & MPElementTypeClassGenerated) {
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// This migration requires explicit permission for types of the generated class.
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element.requiresExplicitMigration = YES;
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return NO;
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}
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}
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// Apply migration.
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element.requiresExplicitMigration = NO;
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element.version = [self version];
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return YES;
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}
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- (NSString *)generateContentNamed:(NSString *)name ofType:(MPElementType)type withCounter:(NSUInteger)counter usingKey:(MPKey *)key {
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static NSDictionary *MPTypes_ciphers = nil;
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if (MPTypes_ciphers == nil)
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MPTypes_ciphers = [NSDictionary dictionaryWithContentsOfURL:
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[[NSBundle mainBundle] URLForResource:@"ciphers" withExtension:@"plist"]];
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// Determine the seed whose bytes will be used for calculating a password
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uint32_t ncounter = htonl(counter), nnameLength = htonl(name.length);
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NSData *counterBytes = [NSData dataWithBytes:&ncounter length:sizeof(ncounter)];
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NSData *nameLengthBytes = [NSData dataWithBytes:&nnameLength length:sizeof(nnameLength)];
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trc(@"seed from: hmac-sha256(%@, 'com.lyndir.masterpassword' | %@ | %@ | %@)", [key.keyData encodeBase64], [nameLengthBytes encodeHex], name, [counterBytes encodeHex]);
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NSData *seed = [[NSData dataByConcatenatingDatas:
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[@"com.lyndir.masterpassword" dataUsingEncoding:NSUTF8StringEncoding],
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nameLengthBytes,
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[name dataUsingEncoding:NSUTF8StringEncoding],
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counterBytes,
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nil]
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hmacWith:PearlHashSHA256 key:key.keyData];
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trc(@"seed is: %@", [seed encodeBase64]);
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const unsigned char *seedBytes = seed.bytes;
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// Determine the cipher from the first seed byte.
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NSAssert([seed length], @"Missing seed.");
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NSArray *typeCiphers = [[MPTypes_ciphers valueForKey:[self classNameOfType:type]] valueForKey:[self nameOfType:type]];
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NSString *cipher = typeCiphers[seedBytes[0] % [typeCiphers count]];
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trc(@"type %@, ciphers: %@, selected: %@", [self nameOfType:type], typeCiphers, cipher);
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// Encode the content, character by character, using subsequent seed bytes and the cipher.
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NSAssert([seed length] >= [cipher length] + 1, @"Insufficient seed bytes to encode cipher.");
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NSMutableString *content = [NSMutableString stringWithCapacity:[cipher length]];
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for (NSUInteger c = 0; c < [cipher length]; ++c) {
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uint16_t keyByte = seedBytes[c + 1];
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NSString *cipherClass = [cipher substringWithRange:NSMakeRange( c, 1 )];
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NSString *cipherClassCharacters = [[MPTypes_ciphers valueForKey:@"MPCharacterClasses"] valueForKey:cipherClass];
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NSString *character = [cipherClassCharacters substringWithRange:NSMakeRange( keyByte % [cipherClassCharacters length], 1 )];
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trc(@"class %@ has characters: %@, index: %u, selected: %@", cipherClass, cipherClassCharacters, keyByte, character);
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[content appendString:character];
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}
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return content;
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}
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@end
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