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iOSDay40网络之数据安全

互联网发展趋势迅猛的今天,数据安全的重要性日趋凸显。也成为我们必须了解的互联网知识。

在移动互联网浪潮下,用户的资金安全、企业的信息安全都是我们实际开发中必须考虑的内容。

iOSDay40网络之数据安全images/loading.gif' 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

1. 数据安全

 1> 概述

  • 数据安全:是一种主动的包含措施,数据本身的安全必须基于可靠的加密算法与安全体系,主要是有对称算法与公开密钥密码体系两种(非对称算法),都包含了数据的加密和解密过程

  • 对称算法:对称密码算法有时又叫传统密码算法,是指加密密钥可以从解密密钥中推算出来,反过来也成立。

  • 非对称算法:对称密码算法有时又叫传统密码算法,就是加密密钥能够从解密密钥中推算出来,反过来也成立。

  • 加密算法有很多种,在iOS开发当中,MD5是我们常用的摘要算法。

 2> 术语

  • 密钥:密钥是一种参数,它是在明文转换为密文或将密文转换为明文的算法中输入的参数。密钥分为对称密钥与非对称密钥(也可以根据用途来分为加密密钥和解密密钥)

  • 明文:没有进行加密,能够直接代表原文含义的信息

  • 密文:经过加密处理处理之后,隐藏原文含义的信息

  • 加密:将明文转换成密文的实施过程

  • 解密:将密文转换成明文的实施过程

2. MD5加密

 1> 哈希算法

  • 哈希算法:哈希算法将任意长度的二进制值映射为较短的固定长度的二进制值,这个小的二进制值称为哈希值。

  • 哈希值是一段数据唯一且极其紧凑的数值表示形式。数据的哈希值可以检验数据的完整性。一般用于快速查找和加密算法。

  • 典型的的哈希算法有:MD2、MD4、MD5 和 SHA-1等。

 2> MD5

  MD5:Message Digest Algorithm MD5(中文名为消息摘要算法第五版)为计算机安全领域广泛使用的一种散列函数,用以提供消息的完整性保护。

 3> MD5算法具有以下特点:

  • 压缩性:任意长度的数据,算出的MD5值长度都是固定的(16进制,32位)。

  • 容易计算:从原数据计算出MD5值很容易。

  • 抗修改性:对原数据进行任何改动,哪怕只修改1个字节,所得到的MD5值都有很大区别。

  • 强抗碰撞:已知原数据和其MD5值,想找到一个具有相同MD5值的数据(即伪造数据)是非常困难的。

 3> 获取字符串MD5值

  • 引入<CommonCrypto/CommonCrypto.h>

  • 获取字符串的MD5值

 1 + (NSMutableString *)stringMD5:(NSString *)str 2 { 3   // 1. 因为MD5是基于C语言的,所以我们要将字符串进行编码 4   const char *data = [str UTF8String]; 5    6   // 2. 使用字符串数组去存取加密后的相关内容(16进制,32位) 7   // CC_MD5_DIGEST_LENGTH表示长度 8   unsigned char result[CC_MD5_DIGEST_LENGTH]; 9   10   // 3. 进行MD5加密11   // 参数1:要加密的内容12   // 参数2:要加密的data的一个长度13   // 参数3:存储MD5加密后的结果数组14   CC_MD5(data, (CC_LONG)strlen(data), result);15   16   // 4. 创建可变字符串,保存结果17   NSMutableString *mutableStr = [NSMutableString string];18   19   // 5. 遍历结果数组,然后添加到可变字符串中20   for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {21     22     // 16进制需要大家知道格式修饰符(%x表示16进制,02表示当不足两位的时候,前面补0)23     [mutableStr appendFormat:@"%02x", result[i]];24   }25   26   return mutableStr;27 } 

 在这里我将字符串使用MD5加密封装为NSString的类目,下载地址:https://github.com/AlonerOwl/MD5CommonCrypto

 4> 获取其他对象MD5值

  • 引入<CommonCrypto/CommonCrypto.h>

  • 将其它对象转化为NSData对象(可以将对象事先写入文件)

 1   // 1. 创建数组 2   NSArray *array = @[@"小胖", @"Rose"]; 3    4   // 2. 找沙盒路径 5   NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 6    7   // 3. 拼接路径 8   NSString *arrayPath = [documentPath stringByAppendingPathComponent:@"array.plist"]; 9   10   // 4. 写入11   [array writeToFile:arrayPath atomically:YES];12   13   // 从沙盒中取出NSData数据14   NSData *data = [NSData dataWithContentsOfFile:arrayPath];

  • 读取NSData对象的MD5值

 1 + (NSMutableString *)dataMD5:(NSData *)data 2 { 3   // 1. 创建MD5对象 4   CC_MD5_CTX md5; 5    6   // 2. 初始化MD5对象 7   CC_MD5_Init(&md5); 8    9   // 3. 准备开始数据加密10   // 参数1:md5对象11   // 参数2:要加密的data的字节长度12   // 参数3:要加密内容的长度13   CC_MD5_Update(&md5, data.bytes, (CC_LONG)data.length);14   15   // 4. 准备一个字符串数组用来存储结构16   unsigned char result[CC_MD5_DIGEST_LENGTH];17   18   // 结束加密19   CC_MD5_Final(result, &md5);20   21   // 5. 创建一个可变字符串存放加密结构22   NSMutableString *mutableString = [NSMutableString string];23   24   // 6. 遍历数组,给可变字符串赋值25   for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {26     [mutableString appendFormat:@"%02x", result[i]];27   }28   return mutableString;29 }

  在这里我将字符串使用MD5加密封装为NSString的类目,下载地址:https://github.com/AlonerOwl/MD5CommonCrypto

 

3. 钥匙串加密

 1> 钥匙串概述

  钥匙串:(英文:Keychain)是苹果公司Mac OS中的密码管理系统。它在Mac OS 8.6中和iOS7之后被导入,并且包括在了所有后续的各版本中。一个钥匙串可以包含多种类型的数据:密码(包括网站,FTP服务器,SSH帐户,网络共享,无线网络,群组软件,加密磁盘镜像等),私钥,电子证书和加密笔记等。

 2> 钥匙串加密

  • 苹果 iOS 和 Mac OS X 系统自带了一套敏感信息保存方案:"钥匙串" (Keychain)。

  • 保存在钥匙串的内容相当于系统对其做了保护,在设备锁定时进行了加密处理。

  • 钥匙串中的条目称为SecItem,但它是存储在CFDictionary中的。SecItemRef类型并不存在。SecItem有五类:通用密码、互联网密码、证书、密钥和身份。在大多数情况下,我们用到的都是通用密码

  • 钥匙串的使用和字典非常的相似

  • 用原生的 Security.framework 就可以实现钥匙串的访问、读写。但是只能在真机上进行。通常我们使用KeychainItemWrapper来完成钥匙串的加密。

 3> 钥匙串的使用

  • 拷贝钥匙串类到工程中,钥匙串类下载地址:https://github.com/AlonerOwl/KeychainItemWrapper

  • 引入标准头文件

  • 生成钥匙串对象

  • 存储加密的数据

  • 获得钥匙串对象

  • 获取加密的数据

  代码:

 1   // 1.创建钥匙串对象 2   // 参数1:标识,用于识别加密的内容(回传标识符) 3   // 参数2:分组,一般为nil 4   KeychainItemWrapper *keychainItem = [[KeychainItemWrapper alloc] initWithIdentifier:@"myItemWrapper" accessGroup:nil]; 5    6   // 常用于加密用户名和密码 7   // 系统提供的键值对中的两个键,非系统的键,是无法添加到字典中的 8   id kUserName = (__bridge id) kSecAttrAccount; 9   id kUserPassword = (__bridge id) kSecValueData;10   11   [keychainItem setObject:@"MBBoy" forKey:kUserName];12   [keychainItem setObject:@"123456" forKey:kUserPassword];13   14   // 从keychain中获取存储的数据15   // 用户16   NSString *userName = [keychainItem objectForKey:kUserName];17   // 密码18   NSString *userPassword = [keychainItem objectForKey:kUserPassword];19   20   NSLog(@"%@,%@", userName, userPassword);

 4> 注意

  • 引入的头文件是MRC模式的,需要进行混编

  • 获取对象的时候Identify必须一致

  • 非系统key值是无法添加到字典中的

4. 公钥加密

 1> 概述

  • 公钥加密也叫非对称加密

  • 常用算法有RSA、ElGamal、背包算法、Rabin等等,IOS中用的最多的是RSA

  • iOS 使用 RSA 加密, 只需要公钥

 2> RSA加密的基本原理

 RSA使用"秘匙对"对数据进行加密解密.在加密解密数据前,需要先生成公钥(public key)和私钥(private key).

 

  • 公钥(public key): 用于加密数据. 用于公开, 一般存放在数据提供方, 例如iOS客户端.
  • 私钥(private key): 用于解密数据. 必须保密, 私钥泄露会造成安全问题.

 3> 使用openssl生成密匙对

  Shell代码

 1 - #!/usr/bin/env bash 2 - echo "Generating RSA key pair ..." 3 - echo "1024 RSA key: private_key.pem" 4 - openssl genrsa -out private_key.pem 1024 5 - 6 - echo "create certification require file: rsaCertReq.csr" 7 - openssl req -new -key private_key.pem -out rsaCertReq.csr 8 - 9 - echo "create certification using x509: rsaCert.crt"10 - openssl x509 -req -days 3650 -in rsaCertReq.csr -signkey private_key.pem -out rsaCert.crt11 -12 - echo "create public_key.der For IOS"13 - openssl x509 -outform der -in rsaCert.crt -out public_key.der14 -15 - echo "create private_key.p12 For IOS. Please remember your password. The password will be used in iOS."16 - openssl pkcs12 -export -out private_key.p12 -inkey private_key.pem -in rsaCert.crt17 -18 - echo "create rsa_public_key.pem For Java"19 - openssl rsa -in private_key.pem -out rsa_public_key.pem -pubout20 - echo "create pkcs8_private_key.pem For Java"21 - openssl pkcs8 -topk8 -in private_key.pem -out pkcs8_private_key.pem -nocrypt22 -23 - echo "finished."

  在你所在的路径下会生成一下公钥文件:

iOSDay40网络之数据安全

  私钥:

  iOSDay40网络之数据安全

  RSA第三方文件下载地址:https://github.com/AlonerOwl/RSAEncrypt

5. KVO

 1> 概述

  KVO:(Key-Value-Observer)键值观察者,是观察者设计模式的一种具体实现

  KVO触发机制:一个对象(观察者),监测另一对象(被观察者)的某属性是否发生变化,若被监测的属性发生的更改,会触发观察者的一个方法(方法名固定,类似代理方法)

 2> 使用步骤

  • 注册观察者(为被观察者指定观察者以及被观察属性)

 1 // KVO 键值观察,是观察者设计模式 2 @interface ViewController () 3  4 // 观察可变数组的改变情况(苹果官方文档不建议对数组进行观察) 5 @property (nonatomic, strong) NSMutableArray *array; 6  7 @end 8  9 - (void)viewDidLoad {10   [super viewDidLoad];11   // Do any additional setup after loading the view, typically from a nib.12   13   self.array = [NSMutableArray array];14   15   // 第一步:注册观察者16   // 参数1:添加的观察者对象17   // 参数2:字符串标识的key18   // 参数3:触发添加观察者对象的时候19   /*20    NSKeyValueObservingOptionNew = 0x01 key或value只要有一个更新的时候就会触发21    NSKeyValueObservingOptionOld = 0x0222    NSKeyValueObservingOptionInitial = 0x0423    NSKeyValueObservingOptionPrior = 0x0824   */25   // 参数4:文本内容 一般为nil26   [self addObserver:self forKeyPath:@"array" options:NSKeyValueObservingOptionNew context:nil];27 }

  • 
实现回调方法

 1 // 第二步:实现回调 2 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context 3 { 4    5   NSLog(@"keyPath = %@", keyPath); 6   NSLog(@"object = %@", object); 7   NSLog(@"change = %@", change); 8    9   // 可以进行刷新UI的操作10 }

  • 
触发回调方法(被观察属性发生更改)

 1 // 第二步:实现回调 2 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context 3 { 4    5   NSLog(@"keyPath = %@", keyPath); 6   NSLog(@"object = %@", object); 7   NSLog(@"change = %@", change); 8    9   // 可以进行刷新UI的操作10 }

  • 移除观察者

  在不需要观察者的时候需要把它删除,本人就只在视图将要消失时移除

1 // 视图将要消失的时候2 - (void)viewWillDisappear:(BOOL)animated3 {4   // 在不需要观察者的时候需要把它删除5   [self removeObserver:self forKeyPath:@"array"];6 }

 




原标题:iOSDay40网络之数据安全

关键词:IOS

IOS
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