可以使用 KeychainItemWrapper
(或不使用)将 NSDictionary
存储在 iPhone
的键链中吗?如果不可能,你有其他的解决方案吗?
可以使用 KeychainItemWrapper
(或不使用)将 NSDictionary
存储在 iPhone
的键链中吗?如果不可能,你有其他的解决方案吗?
在将NSDictionary
存储到Keychain之前,必须正确序列化它。
使用:
[dic description]
[dic propertyList]
你最终将得到一个只包含NSString
对象的NSDictionary
集合。如果您想保留对象的数据类型,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);
}
通过第二次调用NSPropertyListSerialization
返回的NSDictionary
将在NSDictionary
集合内保留原始数据类型。
kSecAttrService
中,这不是一个加密字段。我相信你的意思是使用这里的kSecValueData
,它是加密的有效负载。 - Rob NapierNSData
传递给键 kSecValueData
会破坏 KeychainItemWrapper
,因为内部期望该键的值为 NSString
(即密码)。这是因为它需要加密 kSecValueData
的有效负载,并在此之前将其转换为 NSData
。因此,KeychainItemWrapper
在内部已经执行了 [payloadString dataUsingEncoding:NSUTF8StringEncoding]
,如果您将 NSData
作为 payloadString
传递,您将会得到一个 Unrecognized selector sent to instance exception
异常。请查看我在本页上的答案,以获取更多详细信息和解决方案。 - DTsKeychainItemWrapper
依赖项需要修改库/示例代码以接受 NSData
作为加密的有效载荷,这不是未来的保障。此外,执行 NSDictionary > NSData > NSString
转换序列只是为了使用 KeychainItemWrapper
是低效的: KeychainItemWrapper
将把您的字符串转换回 NSData
,以进行加密。
下面是一个完整的解决方案,通过直接利用钥匙链库来解决上述问题。它被实现为一个类别,因此您可以像这样使用它:
// to store your dictionary
[myDict storeToKeychainWithKey:@"myStorageKey"];
// to retrieve it
NSDictionary *myDict = [NSDictionary dictionaryFromKeychainWithKey:@"myStorageKey"];
// to delete it
[myDict deleteFromKeychainWithKey:@"myStorageKey"];
这里是分类:
@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,您可以轻松修改它以将任何类型的可序列化对象存储在钥匙链中,而不仅仅是字典。只需创建要存储的对象的NSData
表示即可。
对Dts类别进行了一些小的修改。转换为ARC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
编码: [字典描述]
解码: [字典属性列表]
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary];
你应该能够将数据存储在钥匙串中。
//
// 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
//
// 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
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)];
读取它的内容:
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);
}
}