main.cpp

一个RC4暴力破解的例子

#include "rc4.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#include <time.h>

rc4_key rckey;
unsigned char c;
char key[256];
int i=0;

void encode()
{
	FILE *fp1=fopen("c:\\a.log","rb");
	FILE *fp2=fopen("c:\\a.txt","wb");

	int len=filelength(fileno(fp1));
	printf("输入密钥：");
	scanf("%s",key);
	prepare_key((unsigned char *)key,strlen(key),&rckey);
	for(i=0;i<len;i++)
	{
		c=fgetc(fp1);
		rc4(&c, 1, &rckey);
		fputc(c,fp2);
	}
	printf("加密完成！\n");
	fclose(fp1);
	fclose(fp2);
}

void decode()
{
	FILE *fp=fopen("c:\\a.txt","rb");
	int len=filelength(fileno(fp));
	int n=0;
	char timebuf[26];
	_strtime_s(timebuf,9);
	printf("开始时间：%s\n",timebuf);
	while(1)
	{
		itoa(n,key,10);
		printf("\x0dTesting Key:%s",key);
		prepare_key((unsigned char *)key,strlen(key),&rckey);
		fseek(fp,0,SEEK_SET);
		for(i=0;i<len;i++)
		{
			c=fgetc(fp);
			rc4(&c, 1, &rckey);
			if (!(c==0x09 || c==0x0a || c==0x0d || (c>=0x20 && c<=0x80)))
				break;
		}
		if (i==len)
			break;
		n++;
	}
	printf("\n解密成功！");
	_strtime_s(timebuf,9);
	printf("结束时间：%s\n",timebuf);
	fclose(fp);
}

void main()
{
	encode();
	//decode();
}