Ios 将字典存储在钥匙链中
可以使用Ios 将字典存储在钥匙链中,ios,objective-c,iphone,nsdictionary,keychain,Ios,Objective C,Iphone,Nsdictionary,Keychain,可以使用KeychainItemWrapper(或不使用)在iPhone钥匙链中存储NSDictionary? 如果不可能,您是否有其他解决方案?您可以存储任何内容,只需将其序列化即可 NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary]; 您应该能够将该数据存储在钥匙链中。编码:[dic描述] 解码:[dic propertyList]您必须正确序列化NSDictionary,然后才能将其存储到钥匙链中。
KeychainItemWrapper
(或不使用)在iPhone
钥匙链中存储NSDictionary
?
如果不可能,您是否有其他解决方案?您可以存储任何内容,只需将其序列化即可
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary];
您应该能够将该数据存储在钥匙链中。编码:
[dic描述]
解码:
[dic propertyList]
您必须正确序列化NSDictionary
,然后才能将其存储到钥匙链中。
使用:
您将得到一个只包含NSString
对象的NSDictionary
集合。如果要维护对象的数据类型,可以使用NSPropertyListSerialization
KeychainItemWrapper *keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"arbitraryId" accessGroup:nil]
NSString *error;
//The following NSData object may be stored in the Keychain
NSData *dictionaryRep = [NSPropertyListSerialization dataFromPropertyList:dictionary format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
[keychain setObject:dictionaryRep forKey:kSecValueData];
//When the NSData object object is retrieved from the Keychain, you convert it back to NSDictionary type
dictionaryRep = [keychain objectForKey:kSecValueData];
NSDictionary *dictionary = [NSPropertyListSerialization propertyListFromData:dictionaryRep mutabilityOption:NSPropertyListImmutable format:nil errorDescription:&error];
if (error) {
NSLog(@"%@", error);
}
第二次调用
NSPropertyListSerialization
返回的NSDictionary
将保持NSDictionary
集合中的原始数据类型。我发现钥匙链包装器只需要字符串。甚至连数据都没有。因此,要存储字典,您必须按照Bret的建议执行,但需要额外的步骤将NSData序列化转换为字符串。像这样:
NSString *error;
KeychainItemWrapper *keychain = [[KeychainItemWrapper alloc] initWithIdentifier:MY_STRING accessGroup:nil];
NSData *dictionaryRep = [NSPropertyListSerialization dataFromPropertyList:dictToSave format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
NSString *xml = [[NSString alloc] initWithBytes:[dictionaryRep bytes] length:[dictionaryRep length] encoding:NSUTF8StringEncoding];
[keychain setObject:xml forKey:(__bridge id)(kSecValueData)];
重读:
NSError *error;
NSString *xml = [keychain objectForKey:(__bridge id)(kSecValueData)];
if (xml && xml.length) {
NSData *dictionaryRep = [xml dataUsingEncoding:NSUTF8StringEncoding];
dict = [NSPropertyListSerialization propertyListWithData:dictionaryRep options:NSPropertyListImmutable format:nil error:&error];
if (error) {
NSLog(@"%@", error);
}
}
使用
KeychainItemWrapper
依赖项需要修改库/示例代码以接受NSData
作为加密的有效负载,这不是未来的证明。此外,仅为了使用KeychainItemWrapper
而执行NSDictionary>NSData>NSString
转换序列是低效的:KeychainItemWrapper
将字符串转换回NSData
,以对其进行加密
这里有一个完整的解决方案,它通过直接利用keychain库来解决上述问题。它被实现为一个类别,因此您可以这样使用它:
// to store your dictionary
[myDict storeToKeychainWithKey:@"myStorageKey"];
// to retrieve it
NSDictionary *myDict = [NSDictionary dictionaryFromKeychainWithKey:@"myStorageKey"];
// to delete it
[myDict deleteFromKeychainWithKey:@"myStorageKey"];
以下是分类:
@implementation NSDictionary (Keychain)
-(void) storeToKeychainWithKey:(NSString *)aKey {
// serialize dict
NSString *error;
NSData *serializedDictionary = [NSPropertyListSerialization dataFromPropertyList:self format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
// encrypt in keychain
if(!error) {
// first, delete potential existing entries with this key (it won't auto update)
[self deleteFromKeychainWithKey:aKey];
// setup keychain storage properties
NSDictionary *storageQuery = @{
(id)kSecAttrAccount: aKey,
(id)kSecValueData: serializedDictionary,
(id)kSecClass: (id)kSecClassGenericPassword,
(id)kSecAttrAccessible: (id)kSecAttrAccessibleWhenUnlocked
};
OSStatus osStatus = SecItemAdd((CFDictionaryRef)storageQuery, nil);
if(osStatus != noErr) {
// do someting with error
}
}
}
+(NSDictionary *) dictionaryFromKeychainWithKey:(NSString *)aKey {
// setup keychain query properties
NSDictionary *readQuery = @{
(id)kSecAttrAccount: aKey,
(id)kSecReturnData: (id)kCFBooleanTrue,
(id)kSecClass: (id)kSecClassGenericPassword
};
NSData *serializedDictionary = nil;
OSStatus osStatus = SecItemCopyMatching((CFDictionaryRef)readQuery, (CFTypeRef *)&serializedDictionary);
if(osStatus == noErr) {
// deserialize dictionary
NSString *error;
NSDictionary *storedDictionary = [NSPropertyListSerialization propertyListFromData:serializedDictionary mutabilityOption:NSPropertyListImmutable format:nil errorDescription:&error];
if(error) {
NSLog(@"%@", error);
}
return storedDictionary;
}
else {
// do something with error
return nil;
}
}
-(void) deleteFromKeychainWithKey:(NSString *)aKey {
// setup keychain query properties
NSDictionary *deletableItemsQuery = @{
(id)kSecAttrAccount: aKey,
(id)kSecClass: (id)kSecClassGenericPassword,
(id)kSecMatchLimit: (id)kSecMatchLimitAll,
(id)kSecReturnAttributes: (id)kCFBooleanTrue
};
NSArray *itemList = nil;
OSStatus osStatus = SecItemCopyMatching((CFDictionaryRef)deletableItemsQuery, (CFTypeRef *)&itemList);
// each item in the array is a dictionary
for (NSDictionary *item in itemList) {
NSMutableDictionary *deleteQuery = [item mutableCopy];
[deleteQuery setValue:(id)kSecClassGenericPassword forKey:(id)kSecClass];
// do delete
osStatus = SecItemDelete((CFDictionaryRef)deleteQuery);
if(osStatus != noErr) {
// do something with error
}
[deleteQuery release];
}
}
@end
事实上,您可以很容易地修改它,以便在密钥链中存储任何类型的可序列化对象,而不仅仅是一个字典。只需为您要存储的对象创建一个
NSData
表示。对Dts类别进行了一些小的更改。转换为圆弧并使用NSKeyedArchiver存储自定义对象
@implementation NSDictionary (Keychain)
-(void) storeToKeychainWithKey:(NSString *)aKey {
// serialize dict
NSData *serializedDictionary = [NSKeyedArchiver archivedDataWithRootObject:self];
// encrypt in keychain
// first, delete potential existing entries with this key (it won't auto update)
[self deleteFromKeychainWithKey:aKey];
// setup keychain storage properties
NSDictionary *storageQuery = @{
(__bridge id)kSecAttrAccount: aKey,
(__bridge id)kSecValueData: serializedDictionary,
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
(__bridge id)kSecAttrAccessible: (__bridge id)kSecAttrAccessibleWhenUnlocked
};
OSStatus osStatus = SecItemAdd((__bridge CFDictionaryRef)storageQuery, nil);
if(osStatus != noErr) {
// do someting with error
}
}
+(NSDictionary *) dictionaryFromKeychainWithKey:(NSString *)aKey {
// setup keychain query properties
NSDictionary *readQuery = @{
(__bridge id)kSecAttrAccount: aKey,
(__bridge id)kSecReturnData: (id)kCFBooleanTrue,
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword
};
CFDataRef serializedDictionary = NULL;
OSStatus osStatus = SecItemCopyMatching((__bridge CFDictionaryRef)readQuery, (CFTypeRef *)&serializedDictionary);
if(osStatus == noErr) {
// deserialize dictionary
NSData *data = (__bridge NSData *)serializedDictionary;
NSDictionary *storedDictionary = [NSKeyedUnarchiver unarchiveObjectWithData:data];
return storedDictionary;
}
else {
// do something with error
return nil;
}
}
-(void) deleteFromKeychainWithKey:(NSString *)aKey {
// setup keychain query properties
NSDictionary *deletableItemsQuery = @{
(__bridge id)kSecAttrAccount: aKey,
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
(__bridge id)kSecMatchLimit: (__bridge id)kSecMatchLimitAll,
(__bridge id)kSecReturnAttributes: (id)kCFBooleanTrue
};
CFArrayRef itemList = nil;
OSStatus osStatus = SecItemCopyMatching((__bridge CFDictionaryRef)deletableItemsQuery, (CFTypeRef *)&itemList);
// each item in the array is a dictionary
NSArray *itemListArray = (__bridge NSArray *)itemList;
for (NSDictionary *item in itemListArray) {
NSMutableDictionary *deleteQuery = [item mutableCopy];
[deleteQuery setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass];
// do delete
osStatus = SecItemDelete((__bridge CFDictionaryRef)deleteQuery);
if(osStatus != noErr) {
// do something with error
}
}
}
@end
我将访问组支持和模拟器安全添加到Amols解决方案中:
//
// NSDictionary+SharedKeyChain.h
// LHSharedKeyChain
//
#import <Foundation/Foundation.h>
@interface NSDictionary (SharedKeyChain)
/**
* Returns a previously stored dictionary from the KeyChain.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*
* @return NSDictionary A dictionary that has been stored in the Keychain, nil if no dictionary for the key and accessGroup exist.
*/
+ (NSDictionary *)dictionaryFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
/**
* Deletes a previously stored dictionary from the KeyChain.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*/
+ (void)deleteFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
/**
* Save dictionary instance to the KeyChain. Any previously existing data with the same key and accessGroup will be overwritten.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*/
- (void)storeToKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
@end
是的,但是当我读取数据时,我有一个对空NSString的引用。-[KeychainItemWrapper writeToKeychain]”中的断言失败,无法添加Keychain项。然后,您必须提供更多详细信息。“无法添加Keychain项”可能有很多原因。我编辑了代码,以更准确地反映它如何与KeychainItemWrapper一起使用。这将数据存储在
kSecAttrService
中,该字段不是加密字段。我相信您打算在这里使用kSecValueData
,这是加密的有效负载。由于某些原因,您的代码在ios7中无法工作。会考虑把它更新得更清楚些。例如,您说我们需要使用[dic description],但在您的示例中没有dic变量。@user798719-如果您想在NSDictionary对象中维护数据类型,我实际上是说不要使用[dic description]和[dic propertyList]。代码不起作用,传递密钥kSecValueData
的NSData
会破坏KeychainItemWrapper
,因为它在内部期望此密钥的值为NSString
(即密码)。这是因为它需要加密kSecValueData
的有效负载,在加密之前需要将其转换为NSData
。因此,KeychainItemWrapper
已经在内部执行了[payloadString DataUsingEncode:NSUTF8StringEncoding]
,如果您将NSData
作为payloadString
传递,则会将无法识别的选择器发送到实例异常
。请查看我在本页上的答案以了解更多详细信息和解决方案。并非所有数据都是有效的UTF-8,因此这将不起作用。最好的选择是编码到Base64;在所有XML都以声明UTF-8编码开始之后。我相信苹果在XML中将数据编码为Base64(参见示例)。如果真的失败了,那么你的回退到Base64是个好主意。看起来不错。我使用了你的方法,只是我将deleteFromKeychainWithKey作为一个类方法,这样我也可以在没有字典的情况下执行一般的清理。效果很好。我添加了KeychainItemWrapper中最好的部分。请问如何调用dictionaryFromKeychainWithKey?
//
// NSDictionary+SharedKeyChain.h
// LHSharedKeyChain
//
#import <Foundation/Foundation.h>
@interface NSDictionary (SharedKeyChain)
/**
* Returns a previously stored dictionary from the KeyChain.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*
* @return NSDictionary A dictionary that has been stored in the Keychain, nil if no dictionary for the key and accessGroup exist.
*/
+ (NSDictionary *)dictionaryFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
/**
* Deletes a previously stored dictionary from the KeyChain.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*/
+ (void)deleteFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
/**
* Save dictionary instance to the KeyChain. Any previously existing data with the same key and accessGroup will be overwritten.
*
* @param key NSString The name of the dictionary. There can be multiple dictionaries stored in the KeyChain.
* @param accessGroup NSString Access group for shared KeyChains, set to nil for no group.
*/
- (void)storeToKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
@end
//
// NSDictionary+SharedKeyChain.m
// LHSharedKeyChain
//
#import "NSDictionary+SharedKeyChain.h"
@implementation NSDictionary (SharedKeyChain)
- (void)storeToKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
{
// serialize dict
NSData *serializedDictionary = [NSKeyedArchiver archivedDataWithRootObject:self];
// encrypt in keychain
// first, delete potential existing entries with this key (it won't auto update)
[NSDictionary deleteFromKeychainWithKey:key accessGroup:accessGroup];
// setup keychain storage properties
NSDictionary *storageQuery = @{
(__bridge id)kSecAttrAccount: key,
#if TARGET_IPHONE_SIMULATOR
// Ignore the access group if running on the iPhone simulator.
//
// Apps that are built for the simulator aren't signed, so there's no keychain access group
// for the simulator to check. This means that all apps can see all keychain items when run
// on the simulator.
//
// If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
// simulator will return -25243 (errSecNoAccessForItem).
#else
(__bridge id)kSecAttrAccessGroup: accessGroup,
#endif
(__bridge id)kSecValueData: serializedDictionary,
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
(__bridge id)kSecAttrAccessible: (__bridge id)kSecAttrAccessibleWhenUnlocked
};
OSStatus status = SecItemAdd ((__bridge CFDictionaryRef)storageQuery, nil);
if (status != noErr)
{
NSLog (@"%d %@", (int)status, @"Couldn't save to Keychain.");
}
}
+ (NSDictionary *)dictionaryFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
{
// setup keychain query properties
NSDictionary *readQuery = @{
(__bridge id)kSecAttrAccount: key,
#if TARGET_IPHONE_SIMULATOR
// Ignore the access group if running on the iPhone simulator.
//
// Apps that are built for the simulator aren't signed, so there's no keychain access group
// for the simulator to check. This means that all apps can see all keychain items when run
// on the simulator.
//
// If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
// simulator will return -25243 (errSecNoAccessForItem).
#else
(__bridge id)kSecAttrAccessGroup: accessGroup,
#endif
(__bridge id)kSecReturnData: (id)kCFBooleanTrue,
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword
};
CFDataRef serializedDictionary = NULL;
OSStatus status = SecItemCopyMatching ((__bridge CFDictionaryRef)readQuery, (CFTypeRef *)&serializedDictionary);
if (status == noErr)
{
// deserialize dictionary
NSData *data = (__bridge NSData *)serializedDictionary;
NSDictionary *storedDictionary = [NSKeyedUnarchiver unarchiveObjectWithData:data];
return storedDictionary;
}
else
{
NSLog (@"%d %@", (int)status, @"Couldn't read from Keychain.");
return nil;
}
}
+ (void)deleteFromKeychainWithKey:(NSString *)key accessGroup:(NSString *)accessGroup;
{
// setup keychain query properties
NSDictionary *deletableItemsQuery = @{
(__bridge id)kSecAttrAccount: key,
#if TARGET_IPHONE_SIMULATOR
// Ignore the access group if running on the iPhone simulator.
//
// Apps that are built for the simulator aren't signed, so there's no keychain access group
// for the simulator to check. This means that all apps can see all keychain items when run
// on the simulator.
//
// If a SecItem contains an access group attribute, SecItemAdd and SecItemUpdate on the
// simulator will return -25243 (errSecNoAccessForItem).
#else
(__bridge id)kSecAttrAccessGroup: accessGroup,
#endif
(__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
(__bridge id)kSecMatchLimit: (__bridge id)kSecMatchLimitAll,
(__bridge id)kSecReturnAttributes: (id)kCFBooleanTrue
};
CFArrayRef itemList = nil;
OSStatus status = SecItemCopyMatching ((__bridge CFDictionaryRef)deletableItemsQuery, (CFTypeRef *)&itemList);
// each item in the array is a dictionary
NSArray *itemListArray = (__bridge NSArray *)itemList;
for (NSDictionary *item in itemListArray)
{
NSMutableDictionary *deleteQuery = [item mutableCopy];
[deleteQuery setValue:(__bridge id)kSecClassGenericPassword forKey:(__bridge id)kSecClass];
// do delete
status = SecItemDelete ((__bridge CFDictionaryRef)deleteQuery);
if (status != noErr)
{
NSLog (@"%d %@", (int)status, @"Couldn't delete from Keychain.");
}
}
}
@end