// 獲取需要加密文件的二進(jìn)制數(shù)據(jù) NSData *data = [NSData dataWithContentsOfFile:@"/Users/wangpengfei/Desktop/photo/IMG_5551.jpg"]; // 或 base64EncodedStringWithOptions NSData *base64Data = [data base64EncodedDataWithOptions:0]; // 將加密后的文件存儲(chǔ)到桌面 [base64Data writeToFile:@"/Users/wangpengfei/Desktop/123" atomically:YES];

 // 獲得加密后的二進(jìn)制數(shù)據(jù) NSData *base64Data = [NSData dataWithContentsOfFile:@"/Users/wangpengfei/Desktop/123"]; // 解密 base64 數(shù)據(jù) NSData *baseData = [[NSData alloc] initWithBase64EncodedData:base64Data options:0]; // 寫(xiě)入桌面 [baseData writeToFile:@"/Users/wangpengfei/Desktop/IMG_5551.jpg" atomically:YES];

 // 將文件 meinv.jpg 進(jìn)行 base64運(yùn)算之后存儲(chǔ)為 meinv.txt base64 meinv.jpg -o meinv.txt // 講meinv.txt 解碼生成 meinv.png base64 -D meinv.txt -o meinv.png // 將字符串 "hello" 進(jìn)行 base 64 編碼 結(jié)果:aGVsbG8=cho "hello" | base64 // 將 base64編碼之后的結(jié)果 aGVsbG8= 反編碼為字符串 echo aGVsbG8= | base64 -D

 - (void)readLocalUserInfo { // 1. 實(shí)例化偏好設(shè)置對(duì)象 NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; // 2. 取出數(shù)據(jù)進(jìn)行賦值 self.userName.text = [userDefaults objectForKey:kUserNameKey]; // 此時(shí)讀取的是加密后的密碼 self.password.text = [userDefaults objectForKey:kPasswordKey];}

 - (void)saveLocalUserInfo { // 1. 實(shí)例化偏好設(shè)置對(duì)象 NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; // 2. 存儲(chǔ)用戶名 [userDefaults setObject:self.userName.text forKey:kUserNameKey]; // 3. 將密碼進(jìn)行base64 加密 // 將密碼轉(zhuǎn)化為二進(jìn)制數(shù)據(jù) NSData *data = [self.password.text dataUsingEncoding:NSUTF8StringEncoding]; // 進(jìn)行加密 NSString *base64Str = [data base64EncodedStringWithOptions:0]; // 4. 將加密后的密碼存儲(chǔ)到偏好設(shè)置 [userDefaults setObject:base64Str forKey:kPasswordKey]; // 5. 為了保證線程的一致性，無(wú)論是存儲(chǔ)還是讀取數(shù)據(jù)，都要進(jìn)行同步 [userDefaults synchronize];}

 - (IBAction)btnLoginDidClick:(UIButton *)sender { // 如果兩個(gè)文本框均不為空，則進(jìn)行登錄操作 if (self.userName.text.length && self.password.text.length) {  // 1. 創(chuàng)建請(qǐng)求  NSString *urlString = @"http://localhost/login/login.php";  NSURL *url = [NSURL URLWithString:urlString];  // POST 請(qǐng)求需要手動(dòng)設(shè)置請(qǐng)求方法，因此為可變請(qǐng)求  NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];  // 設(shè)置請(qǐng)求方法  request.HTTPMethod = @"POST";  // 設(shè)置請(qǐng)求參數(shù)  NSString *body = [NSString stringWithFormat:@"username=%@&password=%@", self.userName.text, self.password.text];  // 將字符串轉(zhuǎn)為二進(jìn)制數(shù)據(jù)  NSData *bodyData = [body dataUsingEncoding:NSUTF8StringEncoding];  // 設(shè)置請(qǐng)求主體(二進(jìn)制數(shù)據(jù))  request.HTTPBody = bodyData;  // 2. 發(fā)送請(qǐng)求  [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {  // 打印請(qǐng)求結(jié)果  NSLog(@"data:%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);  // 判斷是否登錄成功  if (data && !error) {   NSLog(@"網(wǎng)絡(luò)請(qǐng)求成功!");   NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];   if (dict[@"userID"]) {   [self saveLocalUserInfo];   }   //跳轉(zhuǎn)到app主界面，在主線程中發(fā)送通知   dispatch_async(dispatch_get_main_queue(), ^{   [[NSNotificationCenter defaultCenter] postNotificationName:@"loginSuccess" object:nil];   });  } else {   NSLog(@"網(wǎng)絡(luò)請(qǐng)求失敗!");  }  }] resume]; } else {  NSLog(@"用戶名或密碼不能為空!"); } }

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // 1. 注冊(cè)登錄成功的通知觀察者 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loginSuccess) name:@"loginSuccess" object:nil]; // 2. 注冊(cè)登錄成功的通知觀察者 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(logoutSuccess) name:@"logoutSuccess" object:nil]; // 每次app打開(kāi)后，應(yīng)該展示給用戶哪個(gè)界面 // 3. 利用偏好設(shè)置中用戶保存的信息來(lái)判斷用戶的登錄狀態(tài) NSString *userName = [[NSUserDefaults standardUserDefaults] objectForKey:kUserNameKey]; NSString *password = [[NSUserDefaults standardUserDefaults] objectForKey:kPasswordKey]; if (userName && password) {  // 顯示app 主界面  [self loginSuccess]; } else {  [self logoutSuccess]; } return YES; }

 - (void)loginSuccess { NSLog(@"登錄成功!"); // 獲取主界面 UIStoryboard *mainSb = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; // 切換控制器 self.window.rootViewController = mainSb.instantiateInitialViewController; }

 - (void)logoutSuccess { NSLog(@"注銷(xiāo)成功!"); // 獲取登錄界面 UIStoryboard *loginSb = [UIStoryboard storyboardWithName:@"Login" bundle:nil]; // 切換控制器 self.window.rootViewController = loginSb.instantiateInitialViewController; }

 // 1. 清除本地信息 [[NSUserDefaults standardUserDefaults] removeObjectForKey:kUserNameKey]; [[NSUserDefaults standardUserDefaults] removeObjectForKey:kPasswordKey]; // 同步信息 [[NSUserDefaults standardUserDefaults] synchronize]; // 2. 發(fā)送信息，切換控制器 [[NSNotificationCenter defaultCenter] postNotificationName:@"logoutSuccess" object:nil];

 NSString *password = @"WangPengfei"; password = [password md5String]; NSLog(@"password1:%@", password);

 NSString *salt = @"234567890-!@#$%^&*()_+QWERTYUIOP{ASDFGHJKL:XCVBNM<>"; [password stringByAppendingString:salt]; password = [password md5String]; NSLog(@"password2:%@", password);

 // 1. 當(dāng)前密碼 NSString *password = @"zhang"; // 2. hmacKey值，是對(duì)“WangPengfei” 進(jìn)行 MD5加密之后的值（動(dòng)態(tài)生成的） NSString *hmacKey = @"d3bba33b51acaa0a272de7a2f6dfa233";

 // 1. 第一次加密：第一次 HMAC 運(yùn)算 password = [password hmacMD5StringWithKey:hmacKey]; // 2.1 獲得當(dāng)前的時(shí)間 NSDate *date = [NSDate date]; // 2.2 獲得當(dāng)前時(shí)間的字符串 // 實(shí)例化時(shí)間格式器 NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; // 設(shè)置時(shí)間格式 formatter.dateFormat = @"yyyy-MM-dd HH:mm"; // 獲取當(dāng)前時(shí)間（要和服務(wù)器保持一致） NSString *dateStr = [formatter stringFromDate:date]; // 3. 將第一次加密后的密碼與當(dāng)前時(shí)間的字符串拼接在一起 password = [password stringByAppendingString:dateStr]; // 4. 進(jìn)行第二次 HMAC 加密 password = [password hmacMD5StringWithKey:hmacKey];

 NSURL *url = [NSURL URLWithString:@"http://localhost/login/loginhmac.php"]; // POST 要手動(dòng)設(shè)置方法，因此為可變 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 設(shè)置請(qǐng)求方法 request.HTTPMethod = @"POST"; // 設(shè)置請(qǐng)求體內(nèi)容 NSString *body = [NSString stringWithFormat:@"username=zhangsan&password=%@", password]; request.HTTPBody = [body dataUsingEncoding:NSUTF8StringEncoding];

 [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {  NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); }] resume];

 // 獲取應(yīng)用程序唯一標(biāo)識(shí). NSString *bundleId = [NSBundle mainBundle].bundleIdentifier; // 利用第三方框架,將用戶密碼保存在鑰匙串 [SSKeychain setPassword:self.pwdText.text forService:bundleId account:@"wpf"];

self.pwdText.text = [SSKeychain passwordForService:bundleId account:@"wpf"];

 #import <LocalAuthentication/LocalAuthentication.h>

 float version = [UIDevice currentDevice].systemVersion.floatValue; if (version < 8.0 ) // 判斷當(dāng)前系統(tǒng)版本 {  NSLog(@"系統(tǒng)版本太低,請(qǐng)升級(jí)至最新系統(tǒng)");  return; }

 // 1> 實(shí)例化指紋識(shí)別對(duì)象 LAContext *laCtx = [[LAContext alloc] init]; // 2> 判斷當(dāng)前設(shè)備是否支持指紋識(shí)別功能. if (![laCtx canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:NULL]) {  // 如果設(shè)備不支持指紋識(shí)別功能  NSLog(@"該設(shè)備不支持指紋識(shí)別功能");  return; };

 [laCtx evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"指紋登陸" reply:^(BOOL success, NSError *error) {  // 如果成功,表示指紋輸入正確.  if (success) {   NSLog(@"指紋識(shí)別成功!");  } else {   NSLog(@"指紋識(shí)別錯(cuò)誤,請(qǐng)?jiān)俅螄L試");  } }];