3DES 加密 解密

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#import <Foundation/Foundation.h>

//3DES加密

@interface JKEncrypt : NSObject

-(NSString *)doEncrypt:(NSString *)plainText;

-(NSString*)doDecEncrypt:(NSString *)encryptText;

@end

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//

//  main.m

//  3DES研究

//

//  Created by apple on 15/10/22.

//  Copyright © 2015年 apple. All rights reserved.

//

#import "JKEncrypt.h"

#import <CommonCrypto/CommonDigest.h>

#import <CommonCrypto/CommonCryptor.h>

#import <Security/Security.h>

//密匙 key

#define gkey            @"123456788765432112345678"  //24位的密钥

//偏移量

#define gIv             @"jukai"

@implementation JKEncrypt

-(NSString *)doEncrypt:plainText{

//把string 转NSData

NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];

//length

size_t plainTextBufferSize = [data length];

const void *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);

const void *vkey = (const void *) [gkey UTF8String];

//偏移量

const void *vinitVec = (const void *) [gIv UTF8String];

//配置CCCrypt

ccStatus = CCCrypt(kCCEncrypt,

kCCAlgorithm3DES, //3DES

kCCOptionECBMode|kCCOptionPKCS7Padding, //设置模式

vkey,    //key

kCCKeySize3DES,

//                       vinitVec,     //偏移量，这里不用，设置为nil;不用的话，必须为nil,不可以为@“” 解密算法里也应该为nil,也不可以为@“”

nil,     //偏移量，这里不用，设置为nil;不用的话，必须为nil,不可以为@“”

vplainText,

plainTextBufferSize,

(void *)bufferPtr,

bufferPtrSize,

&movedBytes);

NSData *myData = [NSData dataWithBytes:(const char *)bufferPtr length:(NSUInteger)movedBytes];

NSUInteger          len = [myData length];

char *              chars = (char *)[myData bytes];

NSMutableString *   hexString = [[NSMutableString alloc] init];

for(NSUInteger i = 0; i < len; i++ )

[hexString appendString:[NSString stringWithFormat:@"%0.2hhx", chars[i]]];

return hexString;

}

-(NSString*)doDecEncrypt:(NSString *)hexString{

//十六进制转NSData

long len = [hexString length] / 2;

unsigned char *buf = malloc(len);

unsigned char *whole_byte = buf;

char byte_chars[3] = {'\0','\0','\0'};

int i;

for (i=0; i < [hexString length] / 2; i++) {

byte_chars[0] = [hexString characterAtIndex:i*2];

byte_chars[1] = [hexString characterAtIndex:i*2+1];

*whole_byte = strtol(byte_chars, NULL, 16);

whole_byte++;

}

NSData *encryptData = [NSData dataWithBytes:buf length:len];

size_t plainTextBufferSize = [encryptData length];

const void *vplainText = [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);

const void *vkey = (const void *) [gkey UTF8String];

const void *vinitVec = (const void *) [gIv UTF8String];

ccStatus = CCCrypt(kCCDecrypt,

kCCAlgorithm3DES,

kCCOptionPKCS7Padding|kCCOptionECBMode,

vkey,

kCCKeySize3DES,

nil,

vplainText,

plainTextBufferSize,

(void *)bufferPtr,

bufferPtrSize,

&movedBytes);

NSString *result = [[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr

length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding];

return result;

}

@end