项目1
简单txt文本加密
性质：测试程序，存在数据风险。
注意：不可加密过于复杂的txt文本，造成的数据损失自行承担。
源代码：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
void fileEncry(FILE *fp, long int key, char *filename);
void fileDecry(FILE *fp, long int key, char *filename);
int main()
{
srand((unsigned)time(NULL));
FILE *fp = NULL;
int choose = 0;
long int key = rand() % 500000, userKey = 0;
char filename[20];
printf("enter your filename(.txt):");
scanf("%s", filename);
fp = fopen(filename, "r");
if (fp == NULL)
{
printf("Cannot open this file!\n");
exit(0);
}
printf("\tMENU:\n\t1.Encryption\n\t2.Decryption\nenter your choice 1 or 2:");
scanf("%d", &choose);
if (choose != 1 && choose != 2)
{
printf("Choice Error!\n");
exit(0);
}
switch (choose)
{
case 1:
{
fileEncry(fp, key, filename);
printf("Successful!please look up your file.");
break;
}
case 2:
{
printf("enter your DecryptionKey:");
scanf("%ld", &userKey);
fileDecry(fp, userKey, filename);
printf("Successful!please look up your file.");
break;
}
default:
printf("Choice Error!");
exit(0);
}
return 0;
}
void fileEncry(FILE *fp, long int key, char *filename)
{
int i = 0;
FILE *keyfp = NULL;
char s[1000] = "\0";
fgets(s, sizeof(s), fp);
fclose(fp);
keyfp = fopen("key.txt", "w");
fprintf(keyfp, "%ld", key);
fclose(keyfp);
while (s[i])
{
s[i++] += key;
}
fp = fopen(filename, "w");
fprintf(fp, "%s", s);
fclose(fp);
}
void fileDecry(FILE *fp, long int userKey, char *filename)
{
int i = 0;
char s[1000] = "\0";
fscanf(fp, "%s", s);
fclose(fp);
while (s[i])
{
s[i++] -= userKey;
}
fp = fopen(filename, "w");
fprintf(fp, "%s", s);
fclose(fp);
}
exe可执行文件：
肥柴代码之家 2020-07-06
