我编的文字加密与解密程序；
大家可以试一试；点评一下；
不知大家还有没有什么好的加密与解密算法~
拿出来大家分享一下拉~~
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/*
*For encrypt and decrypt
*Made by Yangkun;
*Copyright Yk;
*Don't use it with out my permission
*My email
a2a2yk@163.com/Date 2006.11.9 2:43
*/
#include<stdio.h>
#include<conio.h>
#include<time.h>
#include<stdlib.h>
FILE *fpr,*fpw;
char in[200],ch,out[200],fin[30]="d:\in.txt",fout[30]="d:\out.txt";
char setway;
int chose;
void cpyright()
{printf("******************En&Decrypt************************");
printf("\n*This program for encrypt and decrypt");
printf("\n*Made by Yangkun");
printf("\n*Copyright 2006~2007 Yk\n*Don't use it with out my permission\n*My email
a2a2yk@163.com");
printf("\n****************************************************");
}
void decrypt(char *in,int j)
{int i;
for(i=0;i<j;i++)
{if(*(in+i)>='A'&&*(in+i)<='Z') *(in+i)=*(in+i)+32;
if(*(in+i)>='a'&&*(in+i)<='z') *(in+i)=*(in+i)+2;
if(*(in+i)>'z'&&*(in+i)<='z'+2) *(in+i)=*(in+i)-26;
printf("%c",*(in+i));
}
}
void encrypt(char *in,int j)
{int i,k;
for(i=0;i<j;i++)
{if(*(in+i)>='a'&&*(in+i)<='z') *(in+i)=*(in+i)-32;
if(*(in+i)>='A'&&*(in+i)<='Z') /*note: limit range of every char*/
{*(in+i)=*(in+i)-2;
if(*(in+i)>=('A'-2)&&*(in+i)<'A') *(in+i)=*(in+i)+26;
k=random(2)+1;
if(k==1&&*(in+i)>='A'&&*(in+i)<='Z'){*(in+i)=*(in+i)+32;}
}
printf("%c",*(in+i));
}
}
void filemake()
{ int i=0;
printf("\nDefaultFrom:d:\\in.txt\nDefaultTo:d:\\out.txt\nDo you want to change route?(Y/N): ");
scanf("%c",&setway);
if(setway=='Y'||setway=='y')
{printf("From(way of date):");
scanf("%s",fin);
printf("To(way of date):");
scanf("%s",fout);
}
fpr=fopen(fin,"rt"); /*note: don't use fpr=fopen("fin","rt");
but use fpr=fopen(fin,"rt"); */
if(fpr==NULL){printf("error");getch();exit(1);}
fpw=fopen(fout,"wt");
if(fpw==NULL){printf("error");getch();exit(1);}
ch=fgetc(fpr);
while(ch!=EOF)
{*(in+i)=ch;
putchar(*(in+i));
ch=fgetc(fpr);
i++;
}
putchar('\n');
strcpy(out,in); /*use out so that it will not change the source information*/
if(chose==1)decrypt(out,i);
if(chose==2)encrypt(out,i);
i=0;
while(out
!='\0')
{fputc(out,fpw);
i++;
}
printf("\nFinished");
}
int setsc()
{ int stf;
printf("\n 1.Type From Keyboard");
printf("\n 2.Get from File\n");
printf(" chose: ");
scanf("%d",&stf);
getchar();
return(stf);
}
void getin()
{char che;
int i=0;
printf("\nEnter Words(Use # to end)");
che=getchar();
while(che!='#')
{*(in+i)=che;
che=getchar();
i++;
}
putchar('\n');
printf("Go on?");
i=0;
che=in;
while(che!='\0') /*note use "!=" not "=="*/
{putchar(che);
che=in;
i++;
}
getch();
printf("\nDefaultTo:d:\out.txt\nDo you want to change route?(Y/N): ");
getchar();
scanf("%c",&setway);
if(setway=='y'||setway=='Y')
{printf("To(way of date): ");scanf("%s",fout);}
strcpy(out,in); /*use out so that it will not change the source information*/
encrypt(out,i);
fpw=fopen(fout,"wt");
if(fpw==NULL){printf("error");getch();exit(1);}
i=0;
while(out!='\0')
{fputc(out,fpw);
i++;
}
printf("\nFinished");
}
main()
{
int st;
randomize();
h:
clrscr();
cpyright();
printf("\n\n\n\n~~~~~~~~~~~~~~~~~~~~START~~~~~~~~~~~~~~~~~~~~~");
printf("\n\n 1:Decrypt words");
printf("\n 2:Encrypt words");
printf("\n 3:Exit\n Choose(1 or 2):");
scanf("%d",&chose);
getchar(); /*note: use getchar() to eat '\n' if you u use getch();error then;*/
if(chose==1)
{filemake();
}
else if(chose==2)
{ st=setsc();
if(st==1){getin();}
if(st==2)filemake();
}
else if(chose==3) exit(0);
else goto h;
printf("\nend");
getch();
}
[em2][em2][em2][em2][em2][em2][em2][em2][em2][em2][em2][em2][em2][em2][ 此贴被a2a2yk在2006-11-12 18:29重新编辑 ]
