#import <CommonCrypto/CommonDigest.h> 
#import <CommonCrypto/CommonCryptor.h>
#import <Security/Security.h>
#import "GTMBase64.h" 
//密匙 key
#define gkey      @"Kyle_Chu"
//偏移量
#define gIv       @"jukai" 
//字符串加密
-(NSString *)doEncryptStr:(NSString *)originalStr{
  //把string 转NSData
  NSData* data = [originalStr 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@“”
            vplainText,
            plainTextBufferSize,
            (void *)bufferPtr,
            bufferPtrSize,
            &movedBytes);
  NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
  NSString *result = [GTMBase64 stringByEncodingData:myData];
  return result;
} 
//字符串解密
-(NSString*)doDecEncryptStr:(NSString *)encryptStr{
  NSData *encryptData = [GTMBase64 decodeData:[encryptStr dataUsingEncoding:NSUTF8StringEncoding]];
  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,
            vinitVec,
            vplainText,
            plainTextBufferSize,
            (void *)bufferPtr,
            bufferPtrSize,
            &movedBytes);
  NSString *result = [[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr
                                   length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding];
  return result;
} 

//1、设置您需要的密匙、偏移量
//密匙 key
#define gkey      @"Kyle_Chu"
//偏移量
#define gIv       @"jukai" 
// @"kyle_jukai" 是测试字符串，换成您需要加密的内容即可
JKEncrypt * en = [[JKEncrypt alloc]init];
//加密
NSString * encryptStr = [en doEncryptStr: @"kyle_jukai"];
NSString * encryptHex = [en doEncryptHex: @"kyle_jukai"];
NSLog(@"字符串加密:%@",encryptStr);
NSLog(@"十六进制加密:%@",encryptHex);
//解密
NSString *decEncryptStr = [en doDecEncryptStr:encryptStr];
NSString *decEncryptHex = [en doEncryptHex:encryptHex];
NSLog(@"字符串解密:%@",decEncryptStr);
NSLog(@"字符串解密:%@",decEncryptHex);