加密文件

#include<stdio.h>
#include<stdlib.h>
void main() {
 //复制一个文件，需要输入两个数据。  一个是被复制的文件，一个是需要复制到哪里。
 //加密程序其实已经完成了70%。
 char l_in_path[200] = { 0 };
 char l_out_path[200] = { 0 };
 char l_pass[50] = { 0 };
 int l_tools = NULL;

 printf("请输入源文件路径：");
 scanf("%s", l_in_path);
 printf("请输入新文件路径：");
 scanf("%s", l_out_path);
 printf("请输入密码：");
 scanf("%s", l_pass);

 printf("输入1为加密，输入2为解密：");
 scanf("%d", &l_tools);
 if (l_tools != 1 && l_tools != 2) {
  printf("功能输入选择错误 ");
  return;
 }
 FILE * l_fp_read = fopen(l_in_path, "rb");
 FILE * l_fp_write = fopen(l_out_path, "wb");

 if (l_fp_read != NULL && l_fp_write != NULL) {
  if (l_tools == 1) {
   char l_temp = fgetc(l_fp_read);
   while (feof(l_fp_read) == 0) {
    l_temp = l_temp + 40;
    fputc(l_temp, l_fp_write);
    l_temp = fgetc(l_fp_read);
   }
  }
  else {
   char l_temp = fgetc(l_fp_read);
   while (feof(l_fp_read) == 0) {
    l_temp = l_temp - 40;
    fputc(l_temp, l_fp_write);
    l_temp = fgetc(l_fp_read);
   }
  }

 }
 fclose(l_fp_read);
 fclose(l_fp_write);
 printf("已复制成功 ");
 system("pause");
}

---

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
void main() {
 //复制一个文件，需要输入两个数据。  一个是被复制的文件，一个是需要复制到哪里。
 //加密程序其实已经完成了70%。
 char l_in_path[200] = { 0 };
 char l_out_path[200] = { 0 };
 char l_pass[50] = { 0 };
 int l_tools = NULL;

 printf("请输入源文件路径：");
 scanf("%s", l_in_path);
 printf("请输入新文件路径：");
 scanf("%s", l_out_path);
 printf("请输入密码：");
 scanf("%s", l_pass);

 printf("输入1为加密，输入2为解密：");
 scanf("%d", &l_tools);
 if (l_tools != 1 && l_tools != 2) {
  printf("功能输入选择错误 ");
  return;
 }

 FILE * l_fp_read = fopen(l_in_path, "rb");
 FILE * l_fp_write = fopen(l_out_path, "wb");
 int l_length = strlen(l_pass);
 int l_count = 0;

 if (l_fp_read != NULL && l_fp_write != NULL) {
  if (l_tools == 1) {
   char l_temp = fgetc(l_fp_read);
   while (feof(l_fp_read) == 0) {
    l_temp = l_temp ^ l_pass[l_count];
    l_temp = l_temp + l_count;
    l_count++;
    if (l_count == l_length) {
     l_count = 0;
    }

    fputc(l_temp, l_fp_write);
    l_temp = fgetc(l_fp_read);
   }
  }
  else {
   char l_temp = fgetc(l_fp_read);
   while (feof(l_fp_read) == 0) {
    l_temp = l_temp - l_count;
    l_temp = l_temp ^ l_pass[l_count];
    l_count++;
    if (l_count == l_length) {
     l_count = 0;
    }
    fputc(l_temp, l_fp_write);
    l_temp = fgetc(l_fp_read);
   }
  }

 }
 fclose(l_fp_read);
 fclose(l_fp_write);
 if (l_tools == 1) {
  printf("已加密成功 ");
 }
 else {
  printf("已解密成功 ");
 }

 system("pause");
}