encrypt.cpp

本软件用于获取已加密的access数据库密码

// encrypt.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "encrypt.h"
#include "stdio.h"
BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    switch (ul_reason_for_call)
	{
		case DLL_PROCESS_ATTACH:
		case DLL_THREAD_ATTACH:
		case DLL_THREAD_DETACH:
		case DLL_PROCESS_DETACH:
			break;
    }
    return TRUE;
}


// This is an example of an exported function.

ENCRYPT_API char* FAR PASCAL GetPassword(char* filedir)
{
	char *password = 0;
	BYTE source[13];
	BYTE data[200];
	FILE *fp;
	int len = 0;
	int i = 0;
	memset(data,0,200);
    
	source[0] = 0x86;
	source[1] = 0xFB;
	source[2] = 0xEC;
	source[3] = 0x37;
	source[4] = 0x5D;
	source[5] = 0x44;
	source[6] = 0x9C;
	source[7] = 0xFA;
	source[8] = 0xC6;
	source[9] = 0x5E;
	source[10] = 0x28;
	source[11] = 0xE6;
	source[12] = 0x13;

	fp = fopen(filedir,"r+b");
	if (fp == NULL)
	{
		*password = '\0';
		return password;
	}
	
	len = fread(data,1,100,fp);
    if (len == 0)
	{
		*password = '\0';
		return password;
	}

	for(i=0; i<13; i++)
	{
		if( source[i] == data[67 + i] )
		{
		   *password = '\0';
	 	   return password;
		}
		else
		{
			*password++ = (char)data[67 + i];
		}
	}
    *password = '\0';
	fclose(fp);
	return password;
}

// This is the constructor of a class that has been exported.
// see encrypt.h for the class definition
CEncrypt::CEncrypt()
{ 
	return; 
}