iOS的AES加解密详解手机开发

   有时候项目可能要用到加解密，以此来保护用户数据的安全性。下面我就来介绍AES的加解密。闲话不多说，直接上代码。

    //   
    //  ViewController.m   
    //  test   
    //   
    //  Created by yons on 14-8-7.   
    //  Copyright (c) 2014年 yons. All rights reserved.   
    //   
       
    #import "ViewController.h"   
    #import "TableViewController.h"   
    #import "SecurityUtil.h"   
    #import "GTMBase64.h"   
       
    #define KEY @"ABCDEFGHIJKLMNOP" //key可修改   
       
    @interface ViewController ()   
    {   
        UIButton *encryption;   
        UIButton *decrypt;   
        UITextField *content;   
           
        UILabel *Before;   
        UILabel *after;   
        UILabel *key;   
    }   
       
    @end   
       
       
       
    @implementation ViewController   
       
    - (void)viewDidLoad   
    {   
        [super viewDidLoad];   
        // Do any additional setup after loading the view, typically from a nib.   
           
        self.view.backgroundColor = [UIColor whiteColor];   
           
        content = [[UITextField alloc] initWithFrame:CGRectMake(20, 60, 280, 40)];   
        content.backgroundColor = [UIColor whiteColor];   
        [self setBorder:content.layer];   
        content.placeholder = @" 请输入加密或解密的字符串";   
          
        [self.view addSubview:content];   
           
         encryption = [[UIButton alloc] initWithFrame:CGRectMake(60, 125,80, 40)];   
        [encryption setTitle:@"加密" forState:UIControlStateNormal] ;   
        encryption.backgroundColor = [UIColor blackColor];   
        [encryption addTarget:self action:@selector(Encryption) forControlEvents:UIControlEventTouchUpInside];   
        [self.view addSubview:encryption];   
           
         decrypt = [[UIButton alloc] initWithFrame:CGRectMake(175, 125,80, 40)];   
        [decrypt setTitle:@"解密" forState:UIControlStateNormal] ;   
         decrypt.backgroundColor = [UIColor blackColor];   
        [decrypt addTarget:self action:@selector(Decrypt) forControlEvents:UIControlEventTouchUpInside];   
        [self.view addSubview:decrypt];   
           
        key = [[UILabel alloc] initWithFrame:CGRectMake(20, 190, 290, 20)];   
        Before = [[UILabel alloc] initWithFrame:CGRectMake(20, 220, 290, 40)];   
        Before.lineBreakMode = YES;   
        Before.numberOfLines = 0;   
          
        after = [[UILabel alloc] initWithFrame:CGRectMake(20, 270, 280, 40)];   
        after.lineBreakMode = YES;   
        after.numberOfLines = 0;   
           
        [key setFont:[UIFont fontWithName:@"Arial" size:14]];   
        [Before setFont:[UIFont fontWithName:@"Arial" size:14]];   
        [after setFont:[UIFont fontWithName:@"Arial" size:14]];   
           
        [self.view addSubview:key];   
        [self.view addSubview:Before];   
        [self.view addSubview:after];   
    }   
       
    // 加边框   
    - (void) setBorder: (CALayer*) layer   
    {   
        [layer setMasksToBounds:YES];   
        [layer setCornerRadius:5.0]; //设置矩圆角半径   
        [layer setBorderWidth:0.7];   //边框宽度   
        [layer setBorderColor:[[UIColor lightGrayColor] CGColor]];   
    }   
       
    //加密   
    - (void) Encryption   
    {   
        if ([content.text isEqualToString:@""])   
        {   
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示！" message:@"亲，你还没有输入任何内容！" delegate:self cancelButtonTitle:@"确 定" otherButtonTitles:nil, nil nil];   
            ;   
        }   
        else   
        {   
            NSString *string = [SecurityUtil encryptAESData:content.text app_key:KEY];   
            key.text = [NSString stringWithFormat:@"加密key：%@",KEY];   
            Before.text = [NSString stringWithFormat:@"加密前：%@",content.text];   
            after.text = [NSString stringWithFormat:@"加密后：%@",string];   
               
            NSLog(@"string：%@", string);   
        }   
          
    }   
       
    //解密   
    - (void) Decrypt   
    {   
        if ([content.text isEqualToString:@""])   
        {   
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示！" message:@"亲，你还没有输入任何内容！" delegate:self cancelButtonTitle:@"确 定" otherButtonTitles:nil, nil nil];   
            ;   
        }   
        else   
        {   
            NSData *EncryptData = [GTMBase64 decodeString:content.text]; //解密前进行GTMBase64编码   
            NSString * string = [SecurityUtil decryptAESData:EncryptData app_key:KEY];   
               
            key.text = [NSString stringWithFormat:@"解密key：%@",KEY];   
            Before.text = [NSString stringWithFormat:@"解密前：%@",content.text];   
               
            if ([string isEqualToString:@""] | [string isEqualToString:nil]) {   
                string = @"解密失败，亲，请输入加密后的字符串！";   
            }   
            after.text = [NSString stringWithFormat:@"解密后：%@",string];   
               
            NSLog(@"string：%@", string);   
        }   
    }   
       
       
    - (void)didReceiveMemoryWarning   
    {   
        [super didReceiveMemoryWarning];   
        // Dispose of any resources that can be recreated.   
    }   
       
    @end  

最后附上Demo的下载地址：
AES加解密Demo（点击下载）

来自：http://blog.csdn.net/by3g123/article/details/44617201