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ios平台下的DES加密

發(fā)布時間：2025/3/19 编程问答 14 豆豆

生活随笔收集整理的這篇文章主要介紹了 ios平台下的DES加密小編覺得挺不錯的,現(xiàn)在分享給大家,幫大家做個參考.

ios des 加/解密(with base64) #include <CommonCrypto/CommonCryptor.h> + (NSString*)Encrypte:(NSString*)src key:(NSString*)key{NSString* retStr = nil;NSData* srcData = [src dataUsingEncoding:NSUTF8StringEncoding];size_t dataOutAvilable = ([srcData length] + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);unsigned char* dataOut = (unsigned char* )malloc(dataOutAvilable * sizeof(unsigned char));memset((void*)dataOut, 0x0, dataOutAvilable);size_t dataOutMoved = 0;Byte iv[] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};CCCryptorStatus ccStatus = CCCrypt(kCCEncrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding | kCCOptionECBMode, (void const*)[key UTF8String], kCCKeySize3DES, iv, [srcData bytes], [srcData length], (void*)dataOut, dataOutAvilable, &dataOutMoved);if (ccStatus == 0) {//成功 base64int base64Len = base64_encode_length(dataOutMoved) + 2;char* tmp = new char[base64Len];memset(tmp, 0, base64Len);int base64Ret = base64_encode((const char*)dataOut,dataOutMoved,tmp,base64Len);if (base64Ret > 0) {retStr = [[[NSString alloc] initWithUTF8String:tmp] autorelease];}delete []tmp;}//NSLog(@"ccStatus: %d EncrypteStr:%@",ccStatus,retStr); delete dataOut;return retStr; }+ (NSString*)Decypte:(NSString*)src key:(NSString*)key{NSString* retStr = nil;int base64Len = base64_decode_length([src length]) + 2;char* tmp = new char[base64Len];memset(tmp, 0, base64Len);CCCryptorStatus ccStatus = kCCParamError;int base64Ret = base64_decode([src UTF8String], [src length],tmp, base64Len);if (base64Ret > 0) {size_t dataOutAvilable = (base64Len + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);unsigned char* dataOut = (unsigned char* )malloc(dataOutAvilable * sizeof(unsigned char));memset((void*)dataOut, 0x0, dataOutAvilable);size_t dataOutMoved = 0;Byte iv[] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};ccStatus = CCCrypt(kCCDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding | kCCOptionECBMode, (void const*)[key UTF8String], kCCKeySize3DES, iv, (const void*)tmp, base64Ret, (void*)dataOut, dataOutAvilable, &dataOutMoved);if (ccStatus == 0) {retStr = [[[NSString alloc] initWithBytes:dataOut length:dataOutMoved encoding:NSUTF8StringEncoding] autorelease];}delete dataOut;}//NSLog(@"ccStatus: %d Decypte:%@",ccStatus,retStr); delete []tmp;return retStr; }

今天終于把ios平臺下的DES加密算法調(diào)通了，在這里記錄一下。說一下我遇到的問題吧。　　　　

　　第一，關(guān)于傳參，Objective-C和C,C++一樣，不能把值類型數(shù)組做為參數(shù)，傳給另一個方法，方法的返回值的類型也一樣不可以是值類型數(shù)組。一旦這么做了，接受參數(shù)的方法只能獲取數(shù)組中的首元素。　　　　

　　　　 ? 解決方法是用 NSMutableData 把值類型的數(shù)組包一層，代碼如下:　　　　

　　　　　　NSMutableData* bufkeyData =[NSMutableData?dataWithLength:2];

　　　　　　int* bufkey = bufkeyData.mutableBytes;　　　　

　　　 ? ??傳參 ? ??[self?make_key:bufkeyData?number:j];?? ? ? ? ? ? ? ? ? ??

　　　　 ?取值 ??　int* bufkey = bufkeyData.mutableBytes;　　　　　　　

　　第二，NSData 與 Byte[]之間的轉(zhuǎn)換

　　　　 ?NSData?*btsData = http://www.cnblogs.com/upwifi/archive/2011/09/05/[in_strdataUsingEncoding:NSUTF8StringEncoding];

Byte?*byteData = http://www.cnblogs.com/upwifi/archive/2011/09/05/(Byte*)malloc(len);

memcpy(byteData, [btsData?bytes], len);

NSMutableData?*bts2Data = http://www.cnblogs.com/upwifi/archive/2011/09/05/[NSMutableDatadataWithLength:len];

[bts2Data?initWithBytes:byteData?length:len];　　

　　第三，需要用一下 Base64?給加密前的和加密后的字串做Encod和Decode處理，我用了第三方的NSData+Base64.m　　　　

?? ? 下面是頭文件：　　　　

//? DesEncrypt.h

//? DesEncryptDemo

//? Created by fred yu on 9/2/11.

#import?<Foundation/Foundation.h>

enum?DesStrategy?{

? ??DesSimple?=?1,

? ??Des3?=?2,

?? ?DesCBC?=?3,

?? ?DesTwoKeys?=?4

};

typedef?enum?DesStrategy DesStrategy;

@interface?DesEncrypt : NSObject {

?? ?NSMutableArray?*keyArray;

}

-(NSData?*)des:(NSData?*)input_data key:(NSString?*)key encrypt:(bool)encrypt;

//Encrypt

-(NSString*)encrypt:(NSString?*)in_str key:(NSString?*)key desMode:(DesStrategy)desMode str2:(NSString?*)str2;

//Decrypt

-(NSString*)decrypt:(NSString?*)in_str key:(NSString?*)key desMode:(DesStrategy)desMode str2:(NSString?*)str2;

//DesCBC

-(NSMutableData?*)desCBC:(NSMutableData?*)input_data key:(NSString?*)key_str iv:(NSString?*)iv encrypt:(bool)encrypt;

-(NSMutableData?*)des:(NSMutableData?*)data key:(NSMutableData?*)key iv:(NSMutableData?*)iv encrypt:(bool)encrypt;

//DesCreateKeys

-(void)desCreateKeys:(NSMutableData?*)key;

//make_data

-(void)make_data:(NSMutableData?*)data number:(int)number;

//make_key

-(NSMutableData?*)make_key:(NSMutableData?*)in_key number:(int)number;

//handle_data

-(NSMutableData?*)handle_data:(NSMutableData?*)data encrypt:(bool)encrypt;

//change_data

-(NSMutableData?*)change_data:(NSMutableData?*)olddata change_tbType:(int)change_tbType;

@end　　　　

?? ?測試代碼及輸出結(jié)果：　　　　

#import?<Foundation/Foundation.h>

#import?"DesEncrypt.h"

int?main (int?argc,?const?char?* argv[]) {

? ??NSAutoreleasePool?* pool = [[NSAutoreleasePool?alloc]?init];

? ??// insert code here...

? ??DesEncrypt?* desEncrypt = [[DesEncrypt?alloc]?init];

NSString?*key1 =?@"12345678";

NSString?*key2 =?@"45678923";

NSString?*msg =?@"abcdefghijk";

NSLog(@"消息: %@",msg);

NSString?*s = [desEncrypt?encrypt:msg?key:key1?desMode:DesCBC?str2:key2];

NSLog(@"經(jīng)過加密處理: %@",s);

NSString?*ss = [desEncrypt?decrypt:s?key:key1?desMode:DesCBC?str2:key2];

NSLog(@"經(jīng)過解密處理: %@",ss);

? ? [pool?drain];

? ??return?0;

}　　　　

fred-yus-MacBook-Pro:~ fred$ /Users/fred/Documents/DesEncryptDemo/build/Debug/DesEncryptDemo ; exit;

2011-09-05 13:05:08.552 DesEncryptDemo[6085:903] 消息: abcdefghijk

2011-09-05 13:05:08.555 DesEncryptDemo[6085:903] 經(jīng)過加密處理: vL5Am3KcszqpJdB594OrkA==

2011-09-05 13:05:08.555 DesEncryptDemo[6085:903] 經(jīng)過解密處理: abcdefghijk

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