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为NSString写分类

NSString+Base64After3DES

.h文件

#import 
   
    #import 
    
     @interface NSString (Base64After3DES)/** *  3DES加密并转Base64 * *  @param plainText        要加密的字符串 *  @param encryptOrDecrypt 系统固定参数: kCCEncrypt *  @param key              自己设定的秘钥 * *  @return 3DES加密后并转Base64的字符串 */+ (NSString*)TripleDES:(NSString*)plainText encryptOrDecrypt:(CCOperation)encryptOrDecrypt key:(NSString*)key; // 这个分类需要注意-fno-objc-arc的问题(需要给这个分类的.m和GTMBase64.m添加)@end
    
   

#import "NSString+Base64After3DES.h"#import "GTMBase64.h"@implementation NSString (Base64After3DES)+(NSString*)TripleDES:(NSString*)plainText encryptOrDecrypt:(CCOperation)encryptOrDecrypt key:(NSString*)key{    const void *vplainText;    size_t plainTextBufferSize;        if (encryptOrDecrypt == kCCDecrypt)    {        //解密        NSData *EncryptData = [GTMBase64 decodeData:[plainText dataUsingEncoding:NSUTF8StringEncoding]];        plainTextBufferSize = [EncryptData length];        vplainText = [EncryptData bytes];    }    else    {        //加密        NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];        plainTextBufferSize = [data length];        vplainText = (const void *)[data 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);    // memset((void *) iv, 0x0, (size_t) sizeof(iv));        const void *vkey = (const void *)[key UTF8String];    // NSString *initVec = @"init Vec";    //const void *vinitVec = (const void *) [initVec UTF8String];    //  Byte iv[] = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};    ccStatus = CCCrypt(encryptOrDecrypt,                       kCCAlgorithm3DES,                       kCCOptionPKCS7Padding | kCCOptionECBMode,                       vkey,                       kCCKeySize3DES,                       nil,                       vplainText,                       plainTextBufferSize,                       (void *)bufferPtr,                       bufferPtrSize,                       &movedBytes);    //if (ccStatus == kCCSuccess) NSLog(@"SUCCESS");    /*else if (ccStatus == kCC ParamError) return @"PARAM ERROR";     else if (ccStatus == kCCBufferTooSmall) return @"BUFFER TOO SMALL";     else if (ccStatus == kCCMemoryFailure) return @"MEMORY FAILURE";     else if (ccStatus == kCCAlignmentError) return @"ALIGNMENT";     else if (ccStatus == kCCDecodeError) return @"DECODE ERROR";     else if (ccStatus == kCCUnimplemented) return @"UNIMPLEMENTED"; */        NSString *result;        if (encryptOrDecrypt == kCCDecrypt)    {        result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr                                                                length:(NSUInteger)movedBytes]                                        encoding:NSUTF8StringEncoding]                  autorelease];    }    else    {        NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];        result = [GTMBase64 stringByEncodingData:myData];    }        return result;}@end

GTMBase64可以在GitHub上搜索下载到

在main方法里使用

#import 
   
    #import "NSString+Base64After3DES.h"int main(int argc, const char * argv[]) {    @autoreleasepool {        NSString *idenStr = [NSString TripleDES:@"test" encryptOrDecrypt:kCCEncrypt key:@"key"];        NSLog(@"%@", idenStr);    }    return 0;}
   

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