iOS Keychain （钥匙串）简单封装

摘要: iOS Keychain 封装

1 、Keychain 是一个非常好用的本地存储工具 完全可以替代NSuserDefault 来使用并且比NSuserDefault更安全 。

2 、Keychain相对于 NSuserDefault最主要的一点就是 NSuserDefault 只能项目内访问 Keychain 说是所有项目公用的 可以做到跨项目读取数据。

3、Keychain经常用来保存用的的账户 密码信息 Keychain在内部实现上实际还是用的数据库 来存储的这里不多做解释

4、用法 这里写死了数据 具体可以根据实际情况 和NSuserDefault 用法一样

[ZFYKeychain savePassWord:@"aaa1" forKey:@"aaa"];
NSLog(@"%@", [ZFYKeychain readPassWordObjectForKey:@"aaa"]);

[ZFYKeychain savePassWord:@"bbb1" forKey:@"bbb"];
NSLog(@"%@", [ZFYKeychain readPassWordObjectForKey:@"bbb"]);

[ZFYKeychain deletePassWordObjectForKey:@"aaa"];

NSLog(@"%@", [ZFYKeychain readPassWordObjectForKey:@"aaa"]);
NSLog(@"%@", [ZFYKeychain readPassWordObjectForKey:@"bbb"]);

5、设置跨APP 共享数据

第一种方法：通过plist方式进行

1>创建一个新文件，选择Property list文件。

2>创建一个新的子节点，取名为keychain-access-groups

3>修改节点keychain-access-groups的类型为Array

4>在keychain-access-groups节点下添加子节点，填入你的主KEY名称

第二种方式：直接通过XCODE特性来配置（非常简单）

1>选择工程配置中的tages>capabilities页面

2>打开Keychain Sharing开关，设置你的主KEY的名称。

LSF.iceTearsTest 是另外一个APP的entitlements file

LSF.Bluetooth 是当前项目的 entitlements file

相互关联之后就可以通过不同的APP来 改变Keychain里边存储的数据



#import <Foundation/Foundation.h>

@interface ZFYKeychain : NSObject

/**
* @brief 存储密码
*
* @param password 密码内容
*
* @param key 键
*/
+(void)savePassWord:(NSString *)password forKey:(NSString *)key;

/**
* @brief 读取密码
*
* @return 密码内容
*
* @param key 键
*/
+(id)readPassWordObjectForKey:(NSString *)key;

/**
* @brief 删除密码数据
*
* @param key 键
*/
+(void)deletePassWordObjectForKey:(NSString *)key;

@end

#import "ZFYKeychain.h"

@implementation ZFYKeychain

static NSString * const KEY_IN_KEYCHAIN = @"com.ZFYKeychain";//key 用来作为存取的标示

+(void)savePassWord:(NSString *)password forKey:(NSString *)key
{
NSMutableDictionary *usernamepasswordKVPairs = [NSMutableDictionary dictionary];
[usernamepasswordKVPairs setObject:password forKey:key];
[self save:KEY_IN_KEYCHAIN data:usernamepasswordKVPairs];
}

+(id)readPassWordObjectForKey:(NSString *)key
{
NSMutableDictionary *usernamepasswordKVPair = (NSMutableDictionary *)[self load:KEY_IN_KEYCHAIN];
return [usernamepasswordKVPair objectForKey:key];
}

+(void)deletePassWordObjectForKey:(NSString *)key
{
[self delete:key];
}

+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {
return [NSMutableDictionary dictionaryWithObjectsAndKeys:
(__bridge_transfer id)kSecClassGenericPassword,(__bridge_transfer id)kSecClass,
service, (__bridge_transfer id)kSecAttrService,
service, (__bridge_transfer id)kSecAttrAccount,
(__bridge_transfer id)kSecAttrAccessibleAfterFirstUnlock,(__bridge_transfer id)kSecAttrAccessible,
nil];
}

+ (void)save:(NSString *)service data:(id)data {
//Get search dictionary
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
//Delete old item before add new item
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
//Add new object to search dictionary(Attention:the data format)
[keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge_transfer id)kSecValueData];
//Add item to keychain with the search dictionary
SecItemAdd((__bridge_retained CFDictionaryRef)keychainQuery, NULL);
}

+ (id)load:(NSString *)service {
id ret = nil;
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
//Configure the search setting
[keychainQuery setObject:(id)kCFBooleanTrue forKey:(__bridge_transfer id)kSecReturnData];
[keychainQuery setObject:(__bridge_transfer id)kSecMatchLimitOne forKey:(__bridge_transfer id)kSecMatchLimit];
CFDataRef keyData = NULL;
if (SecItemCopyMatching((__bridge_retained CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
@try {
ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge_transfer NSData *)keyData];
} @catch (NSException *e) {
NSLog(@"Unarchive of %@ failed: %@", service, e);
} @finally {
}
}
return ret;
}

+ (void)delete:(NSString *)service {
NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
SecItemDelete((__bridge_retained CFDictionaryRef)keychainQuery);
}

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转载请注明出处谢谢：http://my.oschina.net/u/2523541/blog/676745