DES＋Base64 加密解密的方法

来源：互联网发布：不想学英语知乎编辑：程序博客网时间：2024/05/17 05:03

为了保护存储文件不被无聊的吊丝破解，对存储文件里一些明感数据加密还是必须的。

之前自己参考资料写了个Base64，没调试通，死于胎腹。之后在网上找到个GTMBase64，Google Toolbox for Mac。

EncryptUtil.h

////  EncryptUtil.h////  Created by Wu Kurodo on 12-6-27.//  Copyright (c) 2012年 Kurodo Inc. All rights reserved.//#import <Foundation/Foundation.h>@interface EncryptUtil : NSObject+ (NSString *)encryptWithText:(NSString *)sText;+ (NSString *)decryptWithText:(NSString *)sText;@end

EncryptUtil.m

////  EncryptUtil.m////  Created by Wu Kurodo on 12-6-27.//  Copyright (c) 2012年 Kurodo Inc. All rights reserved.//#import "EncryptUtil.h"#import <CommonCrypto/CommonCryptor.h>#import "GTMBase64.h"@implementation EncryptUtil+ (NSString *)encrypt:(NSString *)sText encryptOrDecrypt:(CCOperation)encryptOperation key:(NSString *)key{    const void *vplainText;    size_t plainTextBufferSize;        if (encryptOperation == kCCDecrypt)    {        NSData *decryptData = [GTMBase64 decodeData:[sText dataUsingEncoding:NSUTF8StringEncoding]];        plainTextBufferSize = [decryptData length];        vplainText = [decryptData bytes];    }    else    {        NSData* encryptData = [sText dataUsingEncoding:NSUTF8StringEncoding];        plainTextBufferSize = [encryptData length];        vplainText = (const void *)[encryptData bytes];    }        CCCryptorStatus ccStatus;    uint8_t *bufferPtr = NULL;    size_t bufferPtrSize = 0;    size_t movedBytes = 0;        bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);    bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));    memset((void *)bufferPtr, 0x0, bufferPtrSize);        NSString *initVec = @"init Kurodo";    const void *vkey = (const void *) [key UTF8String];    const void *vinitVec = (const void *) [initVec UTF8String];        ccStatus = CCCrypt(encryptOperation,                       kCCAlgorithm3DES,                       kCCOptionPKCS7Padding,                       vkey,                       kCCKeySize3DES,                       vinitVec,                        vplainText,                       plainTextBufferSize,                       (void *)bufferPtr,                       bufferPtrSize,                       &movedBytes);        NSString *result = nil;        if (encryptOperation == kCCDecrypt)    {        result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding] autorelease];    }    else    {        NSData *data = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];        result = [GTMBase64 stringByEncodingData:data];    }        return result;}+ (NSString *)encryptWithText:(NSString *)sText{    return [self encrypt:sText encryptOrDecrypt:kCCEncrypt key:@"Kurodo"];}+ (NSString *)decryptWithText:(NSString *)sText{    return [self encrypt:sText encryptOrDecrypt:kCCDecrypt key:@"Kurodo"];}@end

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