C语言实现AES加密解密代码分享

#pragma comment (lib, "tomcrypt.lib")
#include "stdafx.h"
#include "time.h"

#include <stdio.h>
#include <tchar.h>
#include <wchar.h>
#include <tomcrypt.h>
#include <math.h>
int _tmain(int argc, _TCHAR* argv[])
{
         int error = 0;//返回值
         int index = 0;//加解密器索引
         unsigned char key[16] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f};//对称密钥
 //unsigned char key[24] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17};
 //unsigned char key[32] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f};
         symmetric_ECB ecbAES = {0};//对称加解密内部结构
         FILE *filePlainText = 0,*fileCipherText = 0,*decryptFile = 0;//文件
         unsigned char ct[16] = {0},pt[16] = {0};//加解密数据块
         size_t len = 0;//长度
 clock_t a,b;
 
         //注册加解密器
         if(-1 == register_cipher(&aes_desc)){
                   printf(_T("register_cipher(&aes_desc) failed"));
                   return (-1);
         }
         //查找对应索引
         index = find_cipher("aes");
         if(index == -1){