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//
// ViewController.m
// 3DESTest
//
// Created by lv wei on 13-4-22.
// Copyright (c) 2013年 lv wei. All rights reserved.
//
#import "ViewController.h"
#import <CommonCrypto/CommonDigest.h>
#import <CommonCrypto/CommonCryptor.h>
#import <CommonCrypto/CommonHMAC.h>
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString* key = @"my little pang bao!";
NSString* content = @"五一回家休息几天啊，好好出去转转玩玩!";
NSData* encryptData = [self AESEncrypt:[content dataUsingEncoding:NSUTF8StringEncoding] withKey:key];
printf("encryptData = %s\n",[encryptData description].UTF8String);
NSData* decryptData = [self AESDecrypt:encryptData withKey:key];
NSString* utf8String = [[NSString alloc] initWithData:decryptData encoding:NSUTF8StringEncoding];
NSLog(@"decryptData = %@",utf8String);
[utf8String release];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSData *) AESEncrypt:(NSData *)srcData withKey:(NSString*)key{
char keyPtr[kCCKeySize3DES+1]; // room for terminator (unused)
bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
// fetch key data
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [srcData length];
size_t buffer_size = dataLength + kCCBlockSize3DES;
void* buffer = malloc(buffer_size);
size_t num_bytes_encrypted = 0;
CCCryptorStatus crypt_status = CCCrypt(kCCEncrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding,
keyPtr, kCCKeySize3DES,
NULL,
[srcData bytes], dataLength,
buffer, buffer_size,
&num_bytes_encrypted);
if (crypt_status == kCCSuccess){
NSLog(@"~~ encrypt data successfully...");
return [NSData dataWithBytesNoCopy:buffer length:num_bytes_encrypted];
}
free(buffer); //free the buffer;
return nil;
}
- (NSData *) AESDecrypt:(NSData *)srcData withKey:(NSString*)key{
char keyPtr[kCCKeySize3DES+1]; // room for terminator (unused)
bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding)
// fetch key data
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger data_length= [srcData length];
size_t buffer_size = data_length + kCCBlockSize3DES;
void* buffer = malloc(buffer_size);
size_t num_bytes_decrypted = 0;
CCCryptorStatus crypt_status = CCCrypt(kCCDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding,
keyPtr, kCCKeySize3DES,
NULL /* initialization vector (optional) */,
[srcData bytes], data_length, /* input */
buffer, buffer_size, /* output */
&num_bytes_decrypted);
if (crypt_status == kCCSuccess){
NSLog(@"decrypt data successfully...");
return [NSData dataWithBytesNoCopy:buffer length:num_bytes_decrypted];
}
free(buffer); //free the buffer;
return nil;
}
@end
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