iOS将字符串3DES加密后转Base64

为NSString写分类

NSString+Base64After3DES

.h文件

#import <Foundation/Foundation.h>
#import <CommonCrypto/CommonCryptor.h>

@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 <Foundation/Foundation.h>
#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