keyChain RSA加密 KVO

#import "ViewController.h"
#import "KeychainItemWrapper.h"
#import "RSA.h"
#import "Person.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *userNameField;
@property (weak, nonatomic) IBOutlet UITextField *passwordField;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
//    //创建钥匙串对象
//    KeychainItemWrapper *item = [[KeychainItemWrapper alloc] initWithIdentifier:@"唯一标识" accessGroup:nil];
//    //系统提供两种key,非系统的键是没法添加到钥匙串里的,而且这两种key都是C的,用在OC需要强转
//    id KUserNameKey = (__bridge id)kSecAttrAccount;
//    id KPasswordKey = (__bridge id)kSecValueData;
//    [item setObject:@"ZhangSan" forKey:KUserNameKey];
//    [item setObject:@"12345" forKey:KPasswordKey];
//
//     //取值
//    NSString *user = [item objectForKey:KUserNameKey];
//    NSString *password = [item objectForKey:KPasswordKey];
//    NSLog(@"%@,%@",user,password);
    
    //RSA加密,非对称加密
    //公钥和私钥都是由证书生成
    NSString *pubkey = @"-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEChqe80lJLTTkJD3X3Lyd7Fj+
zuOhDZkjuLNPog3YR20e5JcrdqI9IFzNbACY/GQVhbnbvBqYgyql8DfPCGXpn0+X
NSxELIUw9Vh32QuhGNr3/TBpechrVeVpFPLwyaYNEk1CawgHCeQqf5uaqiaoBDOT
qeox88Lc1ld7MsfggQIDAQAB
-----END PUBLIC KEY-----";
    //私钥
    NSString *privkey  = @"-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----";
    //需要解密的字符串
   NSString  *encWithPubKey = @"p/hm1SvJm9SuuPy66rrf37+EhynkpVnCxbSCZfKznrAKVfpciX/TZM9GfLrAs+bXlND+GeOeZDz2zm+nZDtxpGV1pyQY03hOWn1MQ2+wBKKQdveEdYJ4TVXwGtC3PMaA3dwdRY+WqInQj9WX4JfuQfkYCqbmI0w86uydjFpenwE=";
    
    NSString *encStr = [RSA encryptString:@"你好" publicKey:pubkey];
    //输出加密后的字符串
    NSLog(@"%@",encStr);
    
    //RSA解密
    NSString *decStr = [RSA decryptString:encStr privateKey:privkey];
    NSLog(@"%@",decStr);
    
    
    
    //创建Person对象,并赋值
    Person *p1 = [Person new];
    p1.name = @"ZhangSan";
    //注册观察者(指定观察者,被观察者,被观察者属性),可以添加多个选项
    [p1 addObserver:self forKeyPath:@"name" options:NSKeyValueObservingOptionNew |NSKeyValueObservingOptionOld | NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionPrior context:nil];
    //触发观察回调方法
    p1.name = @"ZhangSi";
    //移除观察者
    [p1 removeObserver:self forKeyPath:@"name"];

}
//观察者回调方法
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{
    //keyPath 属性路径
    //object 被观察者
    //change 字典存储 kind:观察者选项,被观察对象属性值
    //context 回调方法可以带字符串参数
    NSLog(@"%@",change);
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
//页面跳转
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    //创建钥匙串对象
    KeychainItemWrapper *item = [[KeychainItemWrapper alloc] initWithIdentifier:@"MyKeyChainID" accessGroup:nil];
    
    
    //存储加密内容
    [item setObject:self.userNameField.text forKey:(__bridge id)kSecAttrAccount];
    
    [item setObject:self.passwordField.text forKey:(__bridge id)kSecValueData];
}

@end