AES128-ECB对文件进行加密解密验证

Posted 2022-08-04 旧年不在cd

AES128-ECB对文件进行加密解密验证

一、源码函数讲解

• 源码下载地址

#ifndef __AES_H__
#define __AES_H__

#include <stdint.h>

/* generate expanded key */
参数：key    128bit的密钥
     ekey    扩展后的密钥(11*16byte)
void AES_KeySchedule(uint8_t *key, uint8_t *ekey);    //扩展密钥

/* perform encryption */
参数：ekey    扩展后的密钥(11*16byte)
     state    要加密的128bit数据，加密后的数据也存放在这里
void AES_Encrypt(uint8_t *ekey, uint8_t *state);      //加密

/* perform decryption */
参数：ekey    扩展后的密钥(11*16byte)
     state    要解密的128bit数据，解密后的数据也存放在这里
void AES_Decrypt(uint8_t *ekey, uint8_t *state);     //解密

#endif

二、demo验证

#include "stdio.h"
#include "unistd.h"
#include "fcntl.h"
#include "aes.h"
#include "string.h"

//密钥，随机生成即可
uint8_t key[16] = 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88,
                   0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88;
uint8_t buff[16] = 0;
char *input_file = "./IAP_Pile.bin";        //要加密文件路径
char *enc_file = "./enc.bin";               //加密后的文件路径
char *dec_file = "./dec.bin";               //解密后的文件路径

int main(void)

    //存放扩展密钥的数组
    uint8_t ekey[176] = 0;
    FILE *input_fp = NULL;
    FILE *enc_fp = NULL;
    FILE *dec_fp = NULL;
    int Ret = 0;

    //根据密钥生成扩展密钥
    AES_KeySchedule(key, ekey);

    input_fp = fopen(input_file, "rb");
    if (NULL == input_fp)
    
        perror("fail to fopen!\\r\\n");
        return -1;
    

    enc_fp = fopen(enc_file, "wb+");
    if (NULL == enc_fp)
    
        perror("fail to fopen!\\r\\n");
        return -1;
    

    dec_fp = fopen(dec_file, "wb+");
    if (NULL == dec_fp)
    
        perror("fail to fopen!\\r\\n");
        return -1;
    

    printf("加密文件...\\r\\n");
    while (1)
    
        memset(buff, 0, sizeof(buff));
        Ret = fread(buff, 1, sizeof(buff), input_fp);
        // printf("Ret = %d\\r\\n", Ret);
        if (Ret <= 0)
        
            break;
        
        
        //加密
        AES_Encrypt(ekey, buff);

        fwrite(buff, 1, 16, enc_fp);
    
    printf("文件加密成功，输出文件为：%s\\r\\n", enc_file);

    fseek(enc_fp, 0, SEEK_SET);

    printf("解密文件...\\r\\n");
    while (1)
    
        memset(buff, 0, sizeof(buff));
        Ret = fread(buff, 1, sizeof(buff), enc_fp);
        // printf("Ret = %d\\r\\n", Ret);
        if (Ret <= 0)
        
            break;
        

        //解密
        AES_Decrypt(ekey, buff);

        fwrite(buff, 1, 16, dec_fp);
    
    printf("文件解密成功，输出文件为：%s\\r\\n", dec_file);

    fclose(input_fp);
    fclose(enc_fp);
    fclose(dec_fp);

    return 0;