加密算法通过对原文的每个字符进行异或运算来进行加密;解密时同样进行异或处理即可恢复到原文。
代码实现如下
#include<stdlib.h>
#include <stdio.h>
int getfilesize(char *path)
{
FILE *pf = fopen(path, "r");
if (pf == NULL)
{
return -1;
}
else
{
fseek(pf, 0, SEEK_END);
int length = ftell(pf);
return length;
}
}
void EncryptFile(char *oldpath, char *newpath)
{
int i = 0;
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));
fread(p, sizeof(char), length, pfr);
for (i = 0; i < length; i++)
{
p[i] ^= 'A';
}
fwrite(p, sizeof(char), length, pfw);
fclose(pfr);
fclose(pfw);
}
}
void DecryptFile(char *oldpath, char *newpath)
{
int i = 0;
FILE *pfr, *pfw;
pfr = fopen(oldpath, "rb");
pfw = fopen(newpath, "wb");
if (pfr == NULL || pfw == NULL)
{
fclose(pfr);
fclose(pfw);
return;
}
else
{
int length = getfilesize(oldpath);
char *p = (char *)malloc(length*sizeof(char));
fread(p, sizeof(char), length, pfr);
for (i = 0; i < length; i++)
{
p[i] ^= 'A';
}
fwrite(p, sizeof(char), length, pfw);
fclose(pfr);
fclose(pfw);
}
}
#if 0
void main()
{
// 原始文件的路径
char *oldpath = "log.txt";
// 加密后的路径
char *newpath = "log-EecryptFile.dat";
// 解密后的路径
char *newDecryptFilepath = "log-DecryptFile.txt";
EncryptFile(oldpath, newpath);
DecryptFile(newpath, newDecryptFilepath);
}
#endif
本文转载自: https://blog.csdn.net/L888666Q/article/details/129295532
版权归原作者 L888666Q 所有, 如有侵权,请联系我们删除。
版权归原作者 L888666Q 所有, 如有侵权,请联系我们删除。