iOS将字符串3DES加密后转Base64

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

.m文件

#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;
}

这个在main方法里使用, 是我在测试的时候用的Command Line Tool测试用的, 不是在项目的main方法里面使用.  在需要的地方使用这句话就可以