鲁达 TXT文本加密
忘了是可以加密几兆以下的文本了，自己去看程序，好像是8m还是16m以下，加密个电子书绰绰有余了，加密完会生成一堆乱码，想要解密需要用程序将乱码改回来，程序很简单，但是很实用，有了它你可以放心地看小说，我们那个年代的苦楚，啧啧啧啧。觉得有用的，帮忙点个赞32位系统win-tc可以编译，64位win-tc不可用，64位系统可以用turbo-c编译，但是编译出的程序还得在32位系统下运行，64位系统想运行程序的话需要下载dosbox进行运行。
程序如下
1234.c：
-----------
/* HELLO.C -- Hello, world */
#include ";
#include "conio.h"
#include ";
#include "cjiami.c"
#include "cjiemi.c"
#include "ejiami.c"
#include "ejiemi.c"
#define BitGet ((ch & (1<<(7))) == (1<<(7))) /* 用来判断最高位是1还是0 */
main()
{
char ch;
void lock();
void unlock();
printf("lock a file,please enter 1\nunlock a file,please enter 2\n");
d: ch=getchar();
if(ch=='1') lock();
else if(ch=='2') unlock();
else
{
printf("please enter 1 or 2\n");
getch();
goto d;
}
}
void lock()
{
FILE *fp1,*fp2;
char infile[10],outfile[10],ch,key1[11],key2[11];
int j,d,pc;
long length,i ;
printf("please enter infile name:\n");
scanf("%s",infile);
if((fp1=fopen(infile,"r"))==NULL)
{printf("cannot open infile\n");
getch();
exit(0);
}
printf("please enter outfile name:\n");
scanf("%s",outfile);
if((fp2=fopen(outfile,"w"))==NULL)
{printf("cannot open outfile\n");
getch();
exit(0);
}
printf("please set your password(length<=10bit):\n");
scanf("%s",key1);
printf("please write your password again\n");
re: for(i=0;i<12;i++) /*初始化key2*/
key2[i]=0;
scanf("%s",key2);
for(i=0;key1[i]!='\0';i++)
if(key1[i]!=key2[i])
{
printf("password wrong,please rewrite it");
goto re;
}
if(key1[i]!=key2[i]) /*防止key1的\0不与key2的\0对应*/
{
printf("password wrongq,please rewrite it");
goto re;
}
length=i;
printf("password has been set rightly");
for(i=0;(ch=fgetc(fp1))!=EOF;i++)
{
d=key1[i%(length-1)]-48;
if(BitGet)
ch=cjiami(ch,d);
else if((ch>=33)&&(ch<=126)) ch=ejiami(ch,d);
fputc(ch,fp2);
}
fclose(fp1);
fclose(fp2);
getch();
}
void unlock()
{
FILE *fp1,*fp2;
char infile[10],outfile[10],key[11],ch;
int j,d,pc;
long length,i ;
printf("please enter infile name:\n");
scanf("%s",infile);
if((fp1=fopen(infile,"r"))==NULL)
{printf("cannot open infile\n");
getch();
exit(0);
}
printf("please enter outfile name:\n");
scanf("%s",outfile);
if((fp2=fopen(outfile,"w"))==NULL)
{printf("cannot open outfile\n");
getch();
exit(0);
}
printf("input password(length<=10bit)\n");
scanf("%s",key);
for(i=0;key[i]!='\0';i++);
length=i;
for(i=0;(ch=fgetc(fp1))!=EOF;i++)
{
d=key[i%(length-1)]-48;
if(BitGet)
ch=cjiemi(ch,d);
else if((ch>=33)&&(ch<=126)) ch=ejiemi(ch,d);
fputc(ch,fp2);
}
fclose(fp1);
fclose(fp2);
getch();
}
------------------------------------------------------------------------------
cjiami.c文件：
-------------
char cjiami(char ch,int d)
{ char ah;
int bh;
ah=ch-d;
return(ah);
}
------------------------------------------------------------------------------
cjiemi.c文件：
-------------
char cjiemi(char ch,int d)
{
char ah;
ah=ch+d;
return(ah);
}
------------------------------------------------------------------------------
ejiami.c文件：
-------------
char ejiami(char ch,int d)
{ char ah;
ah=ch-d;
if(ah<33) ah=ah+126-32;
return(ah);
}
------------------------------------------------------------------------------
ejiemi.c文件：
-------------
char ejiemi(char ch,int d)
{
char ah;
ah=ch+d;
if(ah>126) ah=ah-126+32;
return(ah);
}
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作者：闲听落红不忍眠