iOS Keychain （鑰匙串）簡單封裝

1 、Keychain 是一個非常好用的本機存放區工具 完全可以替代NSuserDefault 來使用並且比NSuserDefault更安全  。

 2 、Keychain相對於 NSuserDefault最主要的一點就是 NSuserDefault 只能項目內訪問  Keychain 說是所有項目公用的  可以做到跨項目讀取資料。

3、Keychain經常用來儲存用的的賬戶 密碼資訊  Keychain在內部實現上實際還是用的資料庫 來儲存的這裡不多做解釋

4、用法 這裡寫死了資料 具體可以根據實際情況 和NSuserDefault 用法一樣

  [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、設定跨APP 共用資料 

第一種方法：通過plist方式進行

1>建立一個新檔案，選擇Property list檔案。

2>建立一個新的子節點，取名為keychain-access-groups

3>修改節點keychain-access-groups的類型為Array

4>在keychain-access-groups節點下添加子節點，填入你的主KEY名稱

 

第二種方式：直接通過XCODE特性來配置（非常簡單）

1>選擇工程配置中的tages>capabilities頁面

2>開啟Keychain Sharing開關，設定你的主KEY的名稱。

  LSF.iceTearsTest  是另外一個APP的entitlements file 

      LSF.Bluetooth  是當前項目的 entitlements file 

相互關聯之後就可以通過不同的APP來 改變Keychain裡邊儲存的資料

#import <Foundation/Foundation.h>

@interface ZFYKeychain : NSObject

/**
 *    @brief    儲存密碼
 *
 *    @param     password     密碼內容
 *
 *    @param     key     鍵
 */
+(void)savePassWord:(NSString *)password forKey:(NSString *)key;

/**
 *    @brief    讀取密碼
 *
 *    @return    密碼內容
 *
 *    @param     key     鍵
 */
+(id)readPassWordObjectForKey:(NSString *)key;

/**
 *    @brief    刪除密碼資料
 *
 *    @param     key     鍵
 */
+(void)deletePassWordObjectForKey:(NSString *)key;

@end

 

 

#import "ZFYKeychain.h"

@implementation ZFYKeychain

static NSString * const KEY_IN_KEYCHAIN = @"com.ZFYKeychain";//key 用來作為存取的標示

+(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);
}