c语言加密解密算法

c语言加密解密算法

这里使用的是按位加密，按ASCII码进行加密的算法自己写个，很容易的。
#include
#include
#include
#include

void dofile(char *in_fname,char *pwd,char *out_fname);
void usage(char *name);

void main(int argc,char *argv[])
{
char in_fname[30];
char out_fname[30];
char pwd[10];

if(argc!=4)
{
usage(argv[0]);
printf("\nIn-fname:\n");
gets(in_fname);
while(*in_fname==NULL)
{
printf("\nIn-fname:\n");
gets(in_fname);
}

printf("Password 6-8:\n");
gets(pwd);
while(*pwd==NULL || strlen(pwd)>8 || strlen(pwd)<6)
{
printf("Password 6-8:\n");
gets(pwd);
}

printf("Out-file:\n");
gets(out_fname);
while(*in_fname==NULL)
{
printf("Out-file:\n");
gets(out_fname);
}
while(!strcmp(in_fname,out_fname))
{
printf("文件名不能和源文件相同\n");
printf("Out-file:\n");
gets(out_fname);
}
dofile(in_fname,pwd,out_fname);
printf("加密成功，解密请再次运行程序\n");

}
else
{

strcpy(in_fname,argv[1]);
strcpy(pwd,argv[2]);
strcpy(out_fname,argv[3]);
while(*pwd==NULL || strlen(pwd)>8 || strlen(pwd)<6)
{
printf("Password faied!\n");
printf("Password 6-8:\n");
gets(pwd);
}

while(!strcmp(in_fname,out_fname))
{
printf("文件名不能和源文件相同\n");
printf("Out-file:\n");
gets(out_fname);
while(*in_fname==NULL)
{
printf("Out-file:\n");
gets(out_fname);
}
}

dofile(in_fname,pwd,out_fname);
printf("加密成功，解密请再次运行程序\n");

}

}


void dofile(char *in_fname,char *pwd,char *out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=strlen(pwd);

fp1=fopen(in_fname,"rb");
if(fp1==NULL)
{
printf("cannot open in-file.\n");
exit(1);
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)
{
printf("cannot open or create out-file.\n");
exit(1);
}


while(j0>=0)
{
ch=fgetc(fp1);
while(!feof(fp1))
{
fputc(ch^pwd[j>=j0?j=0:j++],fp2);
ch=fgetc(fp1);
}
j0--;
}
fclose(fp1);
fclose(fp2);
}

void usage(char *name)
{
printf("\t=======================File encryption======================\n");
printf("\tusage: %s In-fname password out_fname\n",name);
printf("\tExample: %s file1.txt 12345678 file2.txt\n",name);
}

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