//==============================================================================
// This file is part of Master Password.
// Copyright (c) 2011-2017, Maarten Billemont.
//
// Master Password is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Master Password is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You can find a copy of the GNU General Public License in the
// LICENSE file. Alternatively, see <http://www.gnu.org/licenses/>.
//==============================================================================
#ifndef trc
#error error
#endif
#import "MPAlgorithmV0.h"
#import "MPEntities.h"
#import "MPAppDelegate_Shared.h"
#import "MPAppDelegate_InApp.h"
#import "mpw-util.h"
/* An AMD HD 7970 calculates 2495M SHA-1 hashes per second at a cost of ~350$ per GPU */
#define CRACKING_PER_SECOND 2495000000UL
#define CRACKING_PRICE 350
static NSOperationQueue *_mpwQueue = nil;
@implementation MPAlgorithmV0
- (id)init {
if (!(self = [super init]))
return nil;
static dispatch_once_t once = 0;
dispatch_once( &once, ^{
_mpwQueue = [NSOperationQueue new];
_mpwQueue.maxConcurrentOperationCount = 1;
_mpwQueue.name = @"mpw queue";
} );
return self;
}
- (MPAlgorithmVersion)version {
return MPAlgorithmVersion0;
}
- (NSString *)description {
return strf( @"V%lu", (unsigned long)self.version );
}
- (NSString *)debugDescription {
return strf( @"<%@: version=%lu>", NSStringFromClass( [self class] ), (unsigned long)self.version );
}
- (BOOL)isEqual:(id)other {
if (other == self)
return YES;
if (!other || ![other conformsToProtocol:@protocol(MPAlgorithm)])
return NO;
return [(id<MPAlgorithm>)other version] == [self version];
}
- (void)mpw_perform:(void ( ^ )(void))operationBlock {
if ([NSOperationQueue currentQueue] == _mpwQueue) {
operationBlock();
return;
}
NSOperation *operation = [NSBlockOperation blockOperationWithBlock:operationBlock];
if ([operation respondsToSelector:@selector( qualityOfService )])
operation.qualityOfService = NSQualityOfServiceUserInitiated;
[_mpwQueue addOperations:@[ operation ] waitUntilFinished:YES];
}
- (BOOL)tryMigrateUser:(MPUserEntity *)user inContext:(NSManagedObjectContext *)moc {
NSError *error = nil;
NSFetchRequest *migrationRequest = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass( [MPSiteEntity class] )];
migrationRequest.predicate = [NSPredicate predicateWithFormat:@"version_ < %d AND user == %@", self.version, user];
NSArray *migrationSites = [moc executeFetchRequest:migrationRequest error:&error];
if (!migrationSites) {
MPError( error, @"While looking for sites to migrate." );
return NO;
}
BOOL success = YES;
for (MPSiteEntity *migrationSite in migrationSites)
if (![migrationSite tryMigrateExplicitly:NO])
success = NO;
return success;
}
- (BOOL)tryMigrateSite:(MPSiteEntity *)site explicit:(BOOL)explicit {
if ([site.algorithm version] != [self version] - 1)
// Only migrate from previous version.
return NO;
if (!explicit) {
// This migration requires explicit permission.
site.requiresExplicitMigration = YES;
return NO;
}
// Apply migration.
site.requiresExplicitMigration = NO;
site.algorithm = self;
return YES;
}
- (NSData *)keyDataForFullName:(NSString *)fullName withMasterPassword:(NSString *)masterPassword {
__block NSData *keyData;
[self mpw_perform:^{
NSDate *start = [NSDate date];
MPMasterKey masterKey = mpw_masterKey( fullName.UTF8String, masterPassword.UTF8String, [self version] );
if (masterKey) {
keyData = [NSData dataWithBytes:masterKey length:MPMasterKeySize];
trc( @"User: %@, password: %@ derives to key ID: %@ (took %0.2fs)", //
fullName, masterPassword, [self keyIDForKey:masterKey], -[start timeIntervalSinceNow] );
mpw_free( &masterKey, MPMasterKeySize );
}
}];
return keyData;
}
- (NSData *)keyIDForKey:(MPMasterKey)masterKey {
return [[NSData dataWithBytesNoCopy:(void *)masterKey length:MPMasterKeySize] hashWith:PearlHashSHA256];
}
- (NSString *)nameOfType:(MPResultType)type {
if (!type)
return nil;
switch (type) {
case MPResultTypeTemplateMaximum:
return @"Maximum Security Password";
case MPResultTypeTemplateLong:
return @"Long Password";
case MPResultTypeTemplateMedium:
return @"Medium Password";
case MPResultTypeTemplateBasic:
return @"Basic Password";
case MPResultTypeTemplateShort:
return @"Short Password";
case MPResultTypeTemplatePIN:
return @"PIN";
case MPResultTypeTemplateName:
return @"Name";
case MPResultTypeTemplatePhrase:
return @"Phrase";
case MPResultTypeStatefulPersonal:
return @"Personal Password";
case MPResultTypeStatefulDevice:
return @"Device Private Password";
case MPResultTypeDeriveKey:
return @"Crypto Key";
}
Throw( @"Type not supported: %lu", (long)type );
}
- (NSString *)shortNameOfType:(MPResultType)type {
if (!type)
return nil;
switch (type) {
case MPResultTypeTemplateMaximum:
return @"Maximum";
case MPResultTypeTemplateLong:
return @"Long";
case MPResultTypeTemplateMedium:
return @"Medium";
case MPResultTypeTemplateBasic:
return @"Basic";
case MPResultTypeTemplateShort:
return @"Short";
case MPResultTypeTemplatePIN:
return @"PIN";
case MPResultTypeTemplateName:
return @"Name";
case MPResultTypeTemplatePhrase:
return @"Phrase";
case MPResultTypeStatefulPersonal:
return @"Personal";
case MPResultTypeStatefulDevice:
return @"Device";
case MPResultTypeDeriveKey:
return @"Key";
}
Throw( @"Type not supported: %lu", (long)type );
}
- (NSString *)classNameOfType:(MPResultType)type {
return NSStringFromClass( [self classOfType:type] );
}
- (Class)classOfType:(MPResultType)type {
if (!type)
Throw( @"No type given." );
switch (type) {
case MPResultTypeTemplateMaximum:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplateLong:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplateMedium:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplateBasic:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplateShort:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplatePIN:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplateName:
return [MPGeneratedSiteEntity class];
case MPResultTypeTemplatePhrase:
return [MPGeneratedSiteEntity class];
case MPResultTypeStatefulPersonal:
return [MPStoredSiteEntity class];
case MPResultTypeStatefulDevice:
return [MPStoredSiteEntity class];
case MPResultTypeDeriveKey:
break;
}
Throw( @"Type not supported: %lu", (long)type );
}
- (NSArray *)allTypes {
return [self allTypesStartingWith:MPResultTypeTemplatePhrase];
}
- (NSArray *)allTypesStartingWith:(MPResultType)startingType {
NSMutableArray *allTypes = [[NSMutableArray alloc] initWithCapacity:8];
MPResultType currentType = startingType;
do {
[allTypes addObject:@(currentType)];
} while ((currentType = [self nextType:currentType]) != startingType);
return allTypes;
}
- (MPResultType)defaultType {
return MPResultTypeTemplateLong;
}
- (MPResultType)nextType:(MPResultType)type {
switch (type) {
case MPResultTypeTemplatePhrase:
return MPResultTypeTemplateName;
case MPResultTypeTemplateName:
return MPResultTypeTemplateMaximum;
case MPResultTypeTemplateMaximum:
return MPResultTypeTemplateLong;
case MPResultTypeTemplateLong:
return MPResultTypeTemplateMedium;
case MPResultTypeTemplateMedium:
return MPResultTypeTemplateBasic;
case MPResultTypeTemplateBasic:
return MPResultTypeTemplateShort;
case MPResultTypeTemplateShort:
return MPResultTypeTemplatePIN;
case MPResultTypeTemplatePIN:
return MPResultTypeStatefulPersonal;
case MPResultTypeStatefulPersonal:
return MPResultTypeStatefulDevice;
case MPResultTypeStatefulDevice:
return MPResultTypeTemplatePhrase;
case MPResultTypeDeriveKey:
break;
}
return [self defaultType];
}
- (MPResultType)previousType:(MPResultType)type {
MPResultType previousType = type, nextType = type;
while ((nextType = [self nextType:nextType]) != type)
previousType = nextType;
return previousType;
}
- (NSString *)mpwLoginForSiteNamed:(NSString *)name usingKey:(MPKey *)key {
return [self mpwResultForSiteNamed:name ofType:MPResultTypeTemplateName parameter:nil withCounter:MPCounterValueInitial
variant:MPKeyPurposeIdentification context:nil usingKey:key];
}
- (NSString *)mpwTemplateForSiteNamed:(NSString *)name ofType:(MPResultType)type
withCounter:(MPCounterValue)counter usingKey:(MPKey *)key {
return [self mpwResultForSiteNamed:name ofType:type parameter:nil withCounter:counter
variant:MPKeyPurposeAuthentication context:nil usingKey:key];
}
- (NSString *)mpwAnswerForSiteNamed:(NSString *)name onQuestion:(NSString *)question usingKey:(MPKey *)key {
return [self mpwResultForSiteNamed:name ofType:MPResultTypeTemplatePhrase parameter:nil withCounter:MPCounterValueInitial
variant:MPKeyPurposeRecovery context:question usingKey:key];
}
- (NSString *)mpwResultForSiteNamed:(NSString *)name ofType:(MPResultType)type parameter:(NSString *)parameter
withCounter:(MPCounterValue)counter variant:(MPKeyPurpose)purpose context:(NSString *)context
usingKey:(MPKey *)key {
__block NSString *result = nil;
[self mpw_perform:^{
char const *resultBytes = mpw_siteResult( [key keyForAlgorithm:self],
name.UTF8String, counter, purpose, context.UTF8String, type, parameter.UTF8String, [self version] );
if (resultBytes) {
result = [NSString stringWithCString:resultBytes encoding:NSUTF8StringEncoding];
mpw_free_string( &resultBytes );
}
}];
return result;
}
- (BOOL)savePassword:(NSString *)plainText toSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
if (!(site.type & MPResultTypeClassStateful)) {
wrn( @"Can only save content to site with a stateful type: %lu.", (long)site.type );
return NO;
}
NSAssert( [[key keyIDForAlgorithm:site.user.algorithm] isEqualToData:site.user.keyID], @"Site does not belong to current user." );
if (![site isKindOfClass:[MPStoredSiteEntity class]]) {
wrn( @"Site with stored type %lu is not an MPStoredSiteEntity, but a %@.",
(long)site.type, [site class] );
return NO;
}
__block NSData *state = nil;
if (plainText)
[self mpw_perform:^{
char const *stateBytes = mpw_siteState( [key keyForAlgorithm:self], site.name.UTF8String,
MPCounterValueInitial, MPKeyPurposeAuthentication, NULL, site.type, plainText.UTF8String, [self version] );
if (stateBytes) {
state = [[NSString stringWithCString:stateBytes encoding:NSUTF8StringEncoding] decodeBase64];
mpw_free_string( &stateBytes );
}
}];
NSDictionary *siteQuery = [self queryForSite:site];
if (!state)
[PearlKeyChain deleteItemForQuery:siteQuery];
else
[PearlKeyChain addOrUpdateItemForQuery:siteQuery withAttributes:@{
(__bridge id)kSecValueData: state,
#if TARGET_OS_IPHONE
(__bridge id)kSecAttrAccessible:
site.type & MPSiteFeatureDevicePrivate? (__bridge id)kSecAttrAccessibleWhenUnlockedThisDeviceOnly
: (__bridge id)kSecAttrAccessibleWhenUnlocked,
#endif
}];
((MPStoredSiteEntity *)site).contentObject = nil;
return YES;
}
- (NSString *)resolveLoginForSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
return PearlAwait( ^(void (^setResult)(id)) {
[self resolveLoginForSite:site usingKey:key result:^(NSString *result_) {
setResult( result_ );
}];
} );
}
- (NSString *)resolvePasswordForSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
return PearlAwait( ^(void (^setResult)(id)) {
[self resolvePasswordForSite:site usingKey:key result:^(NSString *result_) {
setResult( result_ );
}];
} );
}
- (NSString *)resolveAnswerForSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
return PearlAwait( ^(void (^setResult)(id)) {
[self resolveAnswerForSite:site usingKey:key result:^(NSString *result_) {
setResult( result_ );
}];
} );
}
- (NSString *)resolveAnswerForQuestion:(MPSiteQuestionEntity *)question usingKey:(MPKey *)key {
return PearlAwait( ^(void (^setResult)(id)) {
[self resolveAnswerForQuestion:question usingKey:key result:^(NSString *result_) {
setResult( result_ );
}];
} );
}
- (void)resolveLoginForSite:(MPSiteEntity *)site usingKey:(MPKey *)key result:(void ( ^ )(NSString *result))resultBlock {
NSAssert( [[key keyIDForAlgorithm:site.user.algorithm] isEqualToData:site.user.keyID], @"Site does not belong to current user." );
NSString *name = site.name;
BOOL loginGenerated = site.loginGenerated && [[MPAppDelegate_Shared get] isFeatureUnlocked:MPProductGenerateLogins];
NSString *loginName = site.loginName;
id<MPAlgorithm> algorithm = nil;
if (!name.length)
err( @"Missing name." );
else if (!key)
err( @"Missing key." );
else
algorithm = site.algorithm;
if (!loginGenerated || [loginName length])
resultBlock( loginName );
else
PearlNotMainQueue( ^{
resultBlock( [algorithm mpwLoginForSiteNamed:name usingKey:key] );
} );
}
- (void)resolvePasswordForSite:(MPSiteEntity *)site usingKey:(MPKey *)key result:(void ( ^ )(NSString *result))resultBlock {
NSAssert( [[key keyIDForAlgorithm:site.user.algorithm] isEqualToData:site.user.keyID], @"Site does not belong to current user." );
NSString *name = site.name;
MPResultType type = site.type;
id<MPAlgorithm> algorithm = nil;
if (!site.name.length)
err( @"Missing name." );
else if (!key)
err( @"Missing key." );
else
algorithm = site.algorithm;
switch (site.type) {
case MPResultTypeTemplateMaximum:
case MPResultTypeTemplateLong:
case MPResultTypeTemplateMedium:
case MPResultTypeTemplateBasic:
case MPResultTypeTemplateShort:
case MPResultTypeTemplatePIN:
case MPResultTypeTemplateName:
case MPResultTypeTemplatePhrase: {
if (![site isKindOfClass:[MPGeneratedSiteEntity class]]) {
wrn( @"Site with generated type %lu is not an MPGeneratedSiteEntity, but a %@.",
(long)site.type, [site class] );
break;
}
MPCounterValue counter = ((MPGeneratedSiteEntity *)site).counter;
PearlNotMainQueue( ^{
resultBlock( [algorithm mpwTemplateForSiteNamed:name ofType:type withCounter:counter usingKey:key] );
} );
break;
}
case MPResultTypeStatefulPersonal:
case MPResultTypeStatefulDevice: {
if (![site isKindOfClass:[MPStoredSiteEntity class]]) {
wrn( @"Site with stored type %lu is not an MPStoredSiteEntity, but a %@.",
(long)site.type, [site class] );
break;
}
NSDictionary *siteQuery = [self queryForSite:site];
NSData *state = [PearlKeyChain dataOfItemForQuery:siteQuery];
state = state?: ((MPStoredSiteEntity *)site).contentObject;
PearlNotMainQueue( ^{
resultBlock( [algorithm mpwResultForSiteNamed:name ofType:type parameter:[state encodeBase64]
withCounter:MPCounterValueInitial variant:MPKeyPurposeAuthentication context:nil
usingKey:key] );
} );
break;
}
case MPResultTypeDeriveKey:
break;
}
Throw( @"Type not supported: %lu", (long)type );
}
- (void)resolveAnswerForSite:(MPSiteEntity *)site usingKey:(MPKey *)key result:(void ( ^ )(NSString *result))resultBlock {
NSAssert( [[key keyIDForAlgorithm:site.user.algorithm] isEqualToData:site.user.keyID], @"Site does not belong to current user." );
NSString *name = site.name;
id<MPAlgorithm> algorithm = nil;
if (!site.name.length)
err( @"Missing name." );
else if (!key)
err( @"Missing key." );
else
algorithm = site.algorithm;
PearlNotMainQueue( ^{
resultBlock( [algorithm mpwAnswerForSiteNamed:name onQuestion:nil usingKey:key] );
} );
}
- (void)resolveAnswerForQuestion:(MPSiteQuestionEntity *)question usingKey:(MPKey *)key
result:(void ( ^ )(NSString *result))resultBlock {
NSAssert( [[key keyIDForAlgorithm:question.site.user.algorithm] isEqualToData:question.site.user.keyID],
@"Site does not belong to current user." );
NSString *name = question.site.name;
NSString *keyword = question.keyword;
id<MPAlgorithm> algorithm = nil;
if (!name.length)
err( @"Missing name." );
else if (!key)
err( @"Missing key." );
else if ([[MPAppDelegate_Shared get] isFeatureUnlocked:MPProductGenerateAnswers])
algorithm = question.site.algorithm;
PearlNotMainQueue( ^{
resultBlock( [algorithm mpwAnswerForSiteNamed:name onQuestion:keyword usingKey:key] );
} );
}
- (void)importPassword:(NSString *)cipherText protectedByKey:(MPKey *)importKey
intoSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
NSAssert( [[key keyIDForAlgorithm:site.user.algorithm] isEqualToData:site.user.keyID], @"Site does not belong to current user." );
if (cipherText && cipherText.length && site.type & MPResultTypeClassStateful) {
NSString *plainText = [self mpwResultForSiteNamed:site.name ofType:site.type parameter:cipherText
withCounter:MPCounterValueInitial variant:MPKeyPurposeAuthentication context:nil
usingKey:importKey];
if (plainText)
[self savePassword:plainText toSite:site usingKey:key];
}
}
- (NSDictionary *)queryForSite:(MPSiteEntity *)site {
return [PearlKeyChain createQueryForClass:kSecClassGenericPassword attributes:@{
(__bridge id)kSecAttrService: site.type & MPSiteFeatureDevicePrivate? @"DevicePrivate": @"Private",
(__bridge id)kSecAttrAccount: site.name
} matches:nil];
}
- (NSString *)exportPasswordForSite:(MPSiteEntity *)site usingKey:(MPKey *)key {
if (!(site.type & MPSiteFeatureExportContent))
return nil;
NSDictionary *siteQuery = [self queryForSite:site];
NSData *state = [PearlKeyChain dataOfItemForQuery:siteQuery];
return [state?: ((MPStoredSiteEntity *)site).contentObject encodeBase64];
}
- (BOOL)timeToCrack:(out TimeToCrack *)timeToCrack passwordOfType:(MPResultType)type byAttacker:(MPAttacker)attacker {
if (!(type & MPResultTypeClassTemplate))
return NO;
size_t count = 0;
const char **templates = mpw_templatesForType( type, &count );
if (!templates)
return NO;
NSDecimalNumber *permutations = [NSDecimalNumber zero], *templatePermutations;
for (size_t t = 0; t < count; ++t) {
const char *template = templates[t];
templatePermutations = [NSDecimalNumber one];
for (NSUInteger c = 0; c < strlen( template ); ++c)
templatePermutations = [templatePermutations decimalNumberByMultiplyingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:strlen( mpw_charactersInClass( template[c] ) )]];
permutations = [permutations decimalNumberByAdding:templatePermutations];
}
free( templates );
return [self timeToCrack:timeToCrack permutations:permutations forAttacker:attacker];
}
- (BOOL)timeToCrack:(out TimeToCrack *)timeToCrack passwordString:(NSString *)password byAttacker:(MPAttacker)attacker {
NSDecimalNumber *permutations = [NSDecimalNumber one];
for (NSUInteger c = 0; c < [password length]; ++c) {
const char passwordCharacter = [password substringWithRange:NSMakeRange( c, 1 )].UTF8String[0];
unsigned long characterEntropy = 0;
for (NSString *characterClass in @[ @"v", @"c", @"a", @"x" ]) {
char const *charactersForClass = mpw_charactersInClass( characterClass.UTF8String[0] );
if (strchr( charactersForClass, passwordCharacter )) {
// Found class for password character.
characterEntropy = strlen( charactersForClass );
break;
}
}
if (!characterEntropy)
characterEntropy = 256 /* a byte */;
permutations = [permutations decimalNumberByMultiplyingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:characterEntropy]];
}
return [self timeToCrack:timeToCrack permutations:permutations forAttacker:attacker];
}
- (BOOL)timeToCrack:(out TimeToCrack *)timeToCrack permutations:(NSDecimalNumber *)permutations forAttacker:(MPAttacker)attacker {
// Determine base seconds needed to calculate the permutations.
NSDecimalNumber *secondsToCrack = [permutations decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:CRACKING_PER_SECOND]];
// Modify seconds needed by applying our hardware budget.
switch (attacker) {
case MPAttacker1:
break;
case MPAttacker5K:
secondsToCrack = [secondsToCrack decimalNumberByMultiplyingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:CRACKING_PRICE]];
secondsToCrack = [secondsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:5000]];
break;
case MPAttacker20M:
secondsToCrack = [secondsToCrack decimalNumberByMultiplyingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:CRACKING_PRICE]];
secondsToCrack = [secondsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:20000000]];
break;
case MPAttacker5B:
secondsToCrack = [secondsToCrack decimalNumberByMultiplyingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:CRACKING_PRICE]];
secondsToCrack = [secondsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:5000]];
secondsToCrack = [secondsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:1000000]];
break;
}
NSDecimalNumber *ulong_max = (id)[[NSDecimalNumber alloc] initWithUnsignedLong:ULONG_MAX];
NSDecimalNumber *hoursToCrack = [secondsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:3600L]];
if ([hoursToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->hours = (unsigned long long)[hoursToCrack doubleValue];
else
timeToCrack->hours = ULONG_MAX;
NSDecimalNumber *daysToCrack = [hoursToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:24L]];
if ([daysToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->days = (unsigned long long)[daysToCrack doubleValue];
else
timeToCrack->days = ULONG_MAX;
NSDecimalNumber *weeksToCrack = [daysToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:7L]];
if ([weeksToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->weeks = (unsigned long long)[weeksToCrack doubleValue];
else
timeToCrack->weeks = ULONG_MAX;
NSDecimalNumber *monthsToCrack = [daysToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:31L]];
if ([monthsToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->months = (unsigned long long)[monthsToCrack doubleValue];
else
timeToCrack->months = ULONG_MAX;
NSDecimalNumber *yearsToCrack = [daysToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:356L]];
if ([yearsToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->years = (unsigned long long)[yearsToCrack doubleValue];
else
timeToCrack->years = ULONG_MAX;
NSDecimalNumber *universesToCrack = [yearsToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:14000L]];
universesToCrack = [universesToCrack decimalNumberByDividingBy:
(id)[[NSDecimalNumber alloc] initWithUnsignedLong:1000000L]];
if ([universesToCrack compare:ulong_max] == NSOrderedAscending)
timeToCrack->universes = (unsigned long long)[universesToCrack doubleValue];
else
timeToCrack->universes = ULONG_MAX;
return YES;
}
@end