iOS開發-數據加密算法AES

時間 2019-11-16

標籤 ios 開發數據加密算法 aes 欄目 iOS 简体版

原文原文鏈接

iOS開發-數據加密算法AES

分類： iOS開發2014-11-05 13:43 212人閱讀評論(0) 收藏舉報ios

ios 加密算法 MD5AES算法

目錄(?)[+]app

iOS經常使用加密方法（aes、md五、base64）google

一、AES加密

NSData+AES.h文件編碼

// 加密
// NSData-AES.h spa
// Smile .net
// code
// Created by 周敏 on 12-11-24. orm
// Copyright (c) 2012年 BOX. All rights reserved.
//
#import <Foundation/Foundation.h>
@class NSString;
@interface NSData (Encryption)
- (NSData *)AES256EncryptWithKey:(NSString *)key; //加密
- (NSData *)AES256DecryptWithKey:(NSString *)key; //解密
@end

NSData+AES.m文件

//
// NSData-AES.h
// Smile
//
// Created by 周敏 on 12-11-24.
// Copyright (c) 2012年 BOX. All rights reserved.
//
#import "NSData+AES.h"
#import <CommonCrypto/CommonCryptor.h>
@implementation NSData (Encryption)
- (NSData *)AES256EncryptWithKey:(NSString *)key {//加密
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
- (NSData *)AES256DecryptWithKey:(NSString *)key {//解密
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
}
free(buffer);
return nil;
}
@end

這裏AES在iOS加過密之後以nsdata的形式存下來，若是想以nsstring形式存儲，那麼對nsdata進行base64位編碼。

二、BASE64編碼

首先下載GTMBase64文件，在工程中加入三個文件
GTMDefines.h
GTMBase64.h
GTMBase64.m
你能夠在這裏找到這三個文件
http://code.google.com/p/google-toolbox-for-mac/source/browse/trunk/Foundation/?r=87

你也能夠在下面的demo裏面找到這3個文件，demo會完整實現文章裏面經常使用的3種編碼方法。

我在此稍微封裝一下：

.h文件

#pragma mark - base64
+ (NSString*)encodeBase64String:(NSString *)input;
+ (NSString*)decodeBase64String:(NSString *)input;
+ (NSString*)encodeBase64Data:(NSData *)data;
+ (NSString*)decodeBase64Data:(NSData *)data;

.m文件

#pragma mark - base64
+ (NSString*)encodeBase64String:(NSString * )input {
NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
data = [GTMBase64 encodeData:data];
NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
return base64String;
}
+ (NSString*)decodeBase64String:(NSString * )input {
NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
data = [GTMBase64 decodeData:data];
NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
return base64String;
}
+ (NSString*)encodeBase64Data:(NSData *)data {
data = [GTMBase64 encodeData:data];
NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
return base64String;
}
+ (NSString*)decodeBase64Data:(NSData *)data {
data = [GTMBase64 decodeData:data];
NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
return base64String;
}