source-engine/tier0/security.cpp

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Platform level security functions.
//
//=============================================================================//

// Uncomment the following line to require the prescence of a hardware key.
//#define REQUIRE_HARDWARE_KEY

#include "pch_tier0.h"
#if defined( _WIN32 ) && !defined( _X360 )
#define WIN_32_LEAN_AND_MEAN
#include <windows.h>
#endif

#include "tier0/platform.h"
#include "tier0/vcrmode.h"
#include "tier0/memalloc.h"

#ifdef REQUIRE_HARDWARE_KEY
	// This is the previous key, which was compromised.
	//#define VALVE_DESKEY_ID "uW"	// Identity Password, Uniquely identifies HL2 keys
	#define VALVE_DESKEY_ID "u$"	// Identity Password, Uniquely identifies HL2 keys

	// Include the key's API:
	#include "DESKey/algo.h"
	#include "DESKey/dk2win32.h"
	
	#pragma comment(lib, "DESKey/algo32.lib" )
	#pragma comment(lib, "DESKey/dk2win32.lib" )
#endif

bool Plat_VerifyHardwareKey()
{
#ifdef REQUIRE_HARDWARE_KEY
		
	// Ensure that a key with our ID exists:
	if ( FindDK2( VALVE_DESKEY_ID, NULL ) )
		return true;

	return false;
#else 
	return true;
#endif
}

bool Plat_VerifyHardwareKeyDriver()
{
#ifdef REQUIRE_HARDWARE_KEY
	// Ensure that the driver is at least installed:
	return DK2DriverInstalled() != 0; 
#else
	return true;
#endif
}

bool Plat_VerifyHardwareKeyPrompt()
{
#ifdef REQUIRE_HARDWARE_KEY
	if ( !DK2DriverInstalled() )
	{
		if( IDCANCEL == MessageBox( NULL, "No drivers detected for the hardware key, please install them and re-run the application.\n", "No Driver Detected", MB_OKCANCEL ) )
		{
			return false;
		}
	}

	while ( !Plat_VerifyHardwareKey() )
	{
		if ( IDCANCEL == MessageBox( NULL, "Please insert the hardware key and hit 'ok'.\n", "Insert Hardware Key", MB_OKCANCEL ) )
		{
			return false;
		}

		for ( int i=0; i < 2; i++ )
		{
			// Is the key in now?
			if( Plat_VerifyHardwareKey() )
			{
				return true;
			}

			// Sleep 2 / 3 of a second before trying again, in case the os recognizes the key slightly after it's being inserted:
			Sleep(666);
		}
	}

	return true;
#else
	return true;
#endif
}

bool Plat_FastVerifyHardwareKey()
{
#ifdef REQUIRE_HARDWARE_KEY
	static int nIterations = 0;
	
	nIterations++;
	if( nIterations > 100 )
	{
		nIterations = 0;
		return Plat_VerifyHardwareKey();
	}

	return true;
#else
	return true;
#endif
}