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];[alert show];}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];[alert show];}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）
要么读书、要么旅行，灵魂和身体，必须有一个在路上。
