/*	$OpenBSD: arc4random.c,v 1.54 2015/09/13 08:31:47 guenther Exp $	*/

/*
 * Copyright (c) 1996, David Mazieres <dm@uun.org>
 * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
 * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
 * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * ChaCha based random number generator for OpenBSD.
 */

/*
 * Adapted for VeraCrypt
 */

#include "chachaRng.h"
#include "cpu.h"
#include "misc.h"
#include <string.h>

static VC_INLINE void ChaCha20RngReKey (ChaCha20RngCtx* pCtx, int useCallBack)
{
	/* fill rs_buf with the keystream */
	if (pCtx->m_rs_have)
		memset(pCtx->m_rs_buf + sizeof(pCtx->m_rs_buf) - pCtx->m_rs_have, 0, pCtx->m_rs_have);
	ChaCha256Encrypt(&pCtx->m_chachaCtx, pCtx->m_rs_buf, sizeof (pCtx->m_rs_buf),
	    pCtx->m_rs_buf);
	/* mix in optional user provided data */
	if (pCtx->m_getRandSeedCallback && useCallBack) {
		unsigned char dat[CHACHA20RNG_KEYSZ + CHACHA20RNG_IVSZ];
		size_t i;

		pCtx->m_getRandSeedCallback (dat, sizeof (dat));

		for (i = 0; i < (CHACHA20RNG_KEYSZ + CHACHA20RNG_IVSZ); i++)
			pCtx->m_rs_buf[i] ^= dat[i];

		burn (dat, sizeof(dat));
	}

	/* immediately reinit for backtracking resistance */
	ChaCha256Init (&pCtx->m_chachaCtx, pCtx->m_rs_buf, pCtx->m_rs_buf + CHACHA20RNG_KEYSZ, 20);
	memset(pCtx->m_rs_buf, 0, CHACHA20RNG_KEYSZ + CHACHA20RNG_IVSZ);
	pCtx->m_rs_have = sizeof (pCtx->m_rs_buf) - CHACHA20RNG_KEYSZ - CHACHA20RNG_IVSZ;
}

static VC_INLINE void ChaCha20RngStir(ChaCha20RngCtx* pCtx)
{
	ChaCha20RngReKey (pCtx, 1);

	/* invalidate rs_buf */
	pCtx->m_rs_have = 0;
	memset(pCtx->m_rs_buf, 0, CHACHA20RNG_RSBUFSZ);

	pCtx->m_rs_count = 1600000;
}

static VC_INLINE void ChaCha20RngStirIfNeeded(ChaCha20RngCtx* pCtx, size_t len)
{
	if (pCtx->m_rs_count <= len) {
		ChaCha20RngStir(pCtx);
	} .highlight .hll { background-color: #ffffcc }
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/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2016 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#include "System.h"
#include <wx/dynlib.h>
#ifdef TC_WINDOWS
#include <wx/msw/registry.h>
#endif
#include "Common/SecurityToken.h"
#include "Main/Main.h"
#include "Main/Application.h"
#include "Main/GraphicUserInterface.h"
#include "Volume/Cipher.h"
#include "PreferencesDialog.h"

namespace VeraCrypt
{
	PreferencesDialog::PreferencesDialog (wxWindow* parent)
		: PreferencesDialogBase (parent),
		LastVirtualKeyPressed (0),
		Preferences (Gui->GetPreferences()),
		RestoreValidatorBell (false)
	{
#define TC_CHECK_BOX_VALIDATOR(NAME) (TC_JOIN(NAME,CheckBox))->SetValidator (wxGenericValidator (&Preferences.NAME));

#ifdef TC_MACOSX
		PreferencesNotebook->SetMinSize (wxSize (Gui->GetCharWidth (PreferencesNotebook) * 108, -1));
#endif
		// Security
		TC_CHECK_BOX_VALIDATOR (DismountOnLogOff);
		TC_CHECK_BOX_VALIDATOR (DismountOnPowerSaving);
		TC_CHECK_BOX_VALIDATOR (DismountOnScreenSaver);
		TC_CHECK_BOX_VALIDATOR (DismountOnInactivity);
		DismountOnInactivitySpinCtrl->SetValidator (wxGenericValidator (&Preferences.MaxVolumeIdleTime));
		TC_CHECK_BOX_VALIDATOR (ForceAutoDismount);
		PreserveTimestampsCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.PreserveTimestamps));
		TC_CHECK_BOX_VALIDATOR (WipeCacheOnAutoDismount);
		TC_CHECK_BOX_VALIDATOR (WipeCacheOnClose);

		// Mount options
		CachePasswordsCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.CachePassword));
		MountReadOnlyCheckBox->SetValue (Preferences.DefaultMountOptions.Protection == VolumeProtection::ReadOnly);
		MountRemovableCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.Removable));

		FilesystemOptionsTextCtrl->SetValue (Preferences.DefaultMountOptions.FilesystemOptions);

		TrueCryptModeCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.TrueCryptMode));

		int index, prfInitialIndex = 0;
		Pkcs5PrfChoice->Append (LangString["AUTODETECTION"]);

		foreach_ref (const Pkcs5Kdf &kdf, Pkcs5Kdf::GetAvailableAlgorithms(false))
		{
			index = Pkcs5PrfChoice->Append (kdf.GetName());
			if (Preferences.DefaultMountOptions.Kdf
				&& (Preferences.DefaultMountOptions.Kdf->GetName() == kdf.GetName())
				)
			{
				prfInitialIndex = index;
			}
		}
		Pkcs5PrfChoice->Select (prfInitialIndex);

		// Keyfiles
		TC_CHECK_BOX_VALIDATOR (UseKeyfiles);

		DefaultKeyfilesPanel = new KeyfilesPanel (DefaultKeyfilesPage, make_shared <KeyfileList> (Preferences.DefaultKeyfiles));
		DefaultKeyfilesSizer->Add (DefaultKeyfilesPanel, 1, wxALL | wxEXPAND);
		DefaultKeyfilesSizer->Layout();

		TC_CHECK_BOX_VALIDATOR (BackgroundTaskEnabled);
		TC_CHECK_BOX_VALIDATOR (CloseBackgroundTaskOnNoVolumes);
		CloseBackgroundTaskOnNoVolumesCheckBox->Show (!Core->IsInPortableMode());
		TC_CHECK_BOX_VALIDATOR (BackgroundTaskMenuDismountItemsEnabled);
		TC_CHECK_BOX_VALIDATOR (BackgroundTaskMenuMountItemsEnabled);
		TC_CHECK_BOX_VALIDATOR (BackgroundTaskMenuOpenItemsEnabled);

		// Encryption
		AesHwCpuSupportedStaticText->SetLabel (
#ifdef TC_AES_HW_CPU
			(is_aes_hw_cpu_supported() ? LangString["UISTR_YES"] : LangString["UISTR_NO"]));
#else
			LangString["NOT_APPLICABLE_OR_NOT_AVAILABLE"]);
#endif
		NoHardwareCryptoCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.NoHardwareCrypto));

		// Security tokens
		Pkcs11ModulePathTextCtrl->SetValue (wstring (Preferences.SecurityTokenModule));
		TC_CHECK_BOX_VALIDATOR (CloseSecurityTokenSessionsAfterMount);

		// System integration
		TC_CHECK_BOX_VALIDATOR (StartOnLogon);
		TC_CHECK_BOX_VALIDATOR (MountDevicesOnLogon);
		TC_CHECK_BOX_VALIDATOR (MountFavoritesOnLogon);

		TC_CHECK_BOX_VALIDATOR (CloseExplorerWindowsOnDismount);
		TC_CHECK_BOX_VALIDATOR (OpenExplorerWindowAfterMount);

		NoKernelCryptoCheckBox->SetValidator (wxGenericValidator (&Preferences.DefaultMountOptions.NoKernelCrypto));

#ifdef TC_WINDOWS
		// Hotkeys
		TC_CHECK_BOX_VALIDATOR (BeepAfterHotkeyMountDismount);
		TC_CHECK_BOX_VALIDATOR (DisplayMessageAfterHotkeyDismount);
#endif

		TransferDataToWindow();		// Code below relies on TransferDataToWindow() called at this point

#if defined (TC_WINDOWS) || defined (TC_MACOSX)
		FilesystemSizer->Show (false);
#else
		// Auto-dismount is not supported on Linux as dismount may require the user to enter admin password
		AutoDismountSizer->Show (false);
		WipeCacheOnAutoDismountCheckBox->Show (false);
#endif

#ifndef TC_WINDOWS
		LogOnSizer->Show (false);
		MountRemovableCheckBox->Show (false);
		CloseExplorerWindowsOnDismountCheckBox->Show (false);
#endif

#ifndef wxHAS_POWER_EVENTS
		DismountOnPowerSavingCheckBox->Show (false);
#endif

#ifdef TC_MACOSX
		DismountOnScreenSaverCheckBox->Show (false);
		DismountOnLogOffCheckBox->SetLabel (_("VeraCrypt quits"));
		OpenExplorerWindowAfterMountCheckBox->SetLabel (_("Open Finder window for successfully mounted volume"));

		MountRemovableCheckBox->Show (false);
		FilesystemSizer->Show (false);
		LogOnSizer->Show (false);
		CloseExplorerWindowsOnDismountCheckBox->Show (false);
#endif

#ifndef TC_LINUX
		KernelServicesSizer->Show (false);
#endif

#ifdef TC_WINDOWS
		// Hotkeys
		list <int> colPermilles;
		HotkeyListCtrl->InsertColumn (ColumnHotkeyDescription, LangString["ACTION"], wxLIST_FORMAT_LEFT, 1);
		colPermilles.push_back (642);
		HotkeyListCtrl->InsertColumn (ColumnHotkey, LangString["SHORTCUT"], wxLIST_FORMAT_LEFT, 1);
		colPermilles.push_back (358);

		vector <wstring> fields (HotkeyListCtrl->GetColumnCount());

		UnregisteredHotkeys = Preferences.Hotkeys;
		Hotkey::UnregisterList (Gui->GetMainFrame(), UnregisteredHotkeys);

		foreach (shared_ptr <Hotkey> hotkey, Preferences.Hotkeys)
		{
			fields[ColumnHotkeyDescription] = hotkey->Description;
			fields[ColumnHotkey] = hotkey->GetShortcutString();
			Gui->AppendToListCtrl (HotkeyListCtrl, fields, -1, hotkey.get());
		}

		Gui->SetListCtrlHeight (HotkeyListCtrl, 5);

		Layout();
		Fit();
		Gui->SetListCtrlColumnWidths (HotkeyListCtrl, colPermilles);

		RestoreValidatorBell = !wxTextValidator::IsSilent();
		wxTextValidator::SuppressBellOnError (true);
		HotkeyTextCtrl->SetValidator (wxTextValidator (wxFILTER_INCLUDE_CHAR_LIST));

		UpdateHotkeyButtons();
#endif

		// Page setup
		for (size_t page = 0; page < PreferencesNotebook->GetPageCount(); page++)
		{
			wxNotebookPage *np = PreferencesNotebook->GetPage (page);
			if (np == HotkeysPage)
			{
#ifndef TC_WINDOWS
				PreferencesNotebook->RemovePage (page--);
				continue;
#endif
			}

			np->Layout();
		}

		Layout();
		Fit();
		Center();

		StdButtonsOK->SetDefault();

#ifdef TC_WINDOWS
		// Hotkey timer
		class Timer : public wxTimer
		{
		public:
			Timer (PreferencesDialog *dialog) : Dialog (dialog) { }

			void Notify()
			{
				Dialog->OnTimer();
			}

			PreferencesDialog *Dialog;
		};

		mTimer.reset (dynamic_cast <wxTimer *> (new Timer (this)));
		mTimer->Start (25);
#endif
	}

	PreferencesDialog::~PreferencesDialog ()
	{
#ifdef TC_WINDOWS
		if (RestoreValidatorBell)
			wxTextValidator::SuppressBellOnError (false);
#endif
	}

	void PreferencesDialog::SelectPage (wxPanel *page)
	{
		for (size_t pageIndex = 0; pageIndex < PreferencesNotebook->GetPageCount(); pageIndex++)
		{
			if (PreferencesNotebook->GetPage (pageIndex) == page)
				PreferencesNotebook->ChangeSelection (pageIndex);
		}
	}

	void PreferencesDialog::OnAssignHotkeyButtonClick (wxCommandEvent& event)
	{
#ifdef TC_WINDOWS
		foreach (long item, Gui->GetListCtrlSelectedItems (HotkeyListCtrl))
		{
			Hotkey *hotkey = reinterpret_cast <Hotkey *> (HotkeyListCtrl->GetItemData (item));

			int mods = 0;
			mods |=	HotkeyShiftCheckBox->IsChecked() ? wxMOD_SHIFT : 0;
			mods |=	HotkeyControlCheckBox->IsChecked() ? wxMOD_CONTROL : 0;
			mods |=	HotkeyAltCheckBox->IsChecked() ? wxMOD_ALT : 0;
			mods |=	HotkeyWinCheckBox->IsChecked() ? wxMOD_WIN : 0;

			// F1 is help and F12 is reserved for use by the debugger at all times
			if (mods == 0 && (LastVirtualKeyPressed == VK_F1 || LastVirtualKeyPressed == VK_F12))
			{
				Gui->ShowError ("CANNOT_USE_RESERVED_KEY");
				return;
			}

			// Test if the hotkey can be registered
			if (!this->RegisterHotKey (hotkey->Id, mods, LastVirtualKeyPressed))
			{
				Gui->ShowError (SystemException (SRC_POS));
				return;
			}
			UnregisterHotKey (hotkey->Id);

			foreach_ref (const Hotkey &h, Preferences.Hotkeys)
			{
				if (h.Id != hotkey->Id && h.VirtualKeyCode == LastVirtualKeyPressed && h.VirtualKeyModifiers == mods)
				{
					Gui->ShowError ("SHORTCUT_ALREADY_IN_USE");
					return;
				}
			}

			hotkey->VirtualKeyCode = LastVirtualKeyPressed;
			hotkey->VirtualKeyModifiers = mods;

			vector <wstring> fields (HotkeyListCtrl->GetColumnCount());
			fields[ColumnHotkeyDescription] = hotkey->Description;
			fields[ColumnHotkey] = hotkey->GetShortcutString();
			Gui->UpdateListCtrlItem (HotkeyListCtrl, item, fields);

			UpdateHotkeyButtons();
		}
#endif // TC_WINDOWS
	}

	void PreferencesDialog::OnBackgroundTaskEnabledCheckBoxClick (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			BackgroundTaskEnabledCheckBox->SetValue (!Gui->AskYesNo (LangString["CONFIRM_BACKGROUND_TASK_DISABLED"], false, true));
	}

	void PreferencesDialog::OnNoHardwareCryptoCheckBoxClick (wxCommandEvent& event)
	{
		if (event.IsChecked())
		{
			if (Gui->AskYesNo (LangString["CONFIRM_SETTING_DEGRADES_PERFORMANCE"], true, true))
			{
#ifdef TC_LINUX
				Gui->ShowWarning (_("Please note that this setting takes effect only if use of the kernel cryptographic services is disabled."));
#endif
			}
			else
				NoHardwareCryptoCheckBox->SetValue (false);
		}

		Gui->ShowWarning (_("Please note that any currently mounted volumes need to be remounted before they can use this setting."));
	}

	void PreferencesDialog::OnNoKernelCryptoCheckBoxClick (wxCommandEvent& event)
	{
		if (event.IsChecked())
			NoKernelCryptoCheckBox->SetValue (Gui->AskYesNo (_("Disabling the use of kernel cryptographic services can degrade performance.\n\nAre you sure?"), false, true));
	}

	void PreferencesDialog::OnClose (wxCloseEvent& event)
	{
#ifdef TC_WINDOWS
		Hotkey::RegisterList (Gui->GetMainFrame(), UnregisteredHotkeys);
#endif
		event.Skip();
	}

	void PreferencesDialog::OnDismountOnPowerSavingCheckBoxClick (wxCommandEvent& event)
	{
		if (event.IsChecked() && !ForceAutoDismountCheckBox->IsChecked())
			Gui->ShowWarning ("WARN_PREF_AUTO_DISMOUNT");
	}

	void PreferencesDialog::OnDismountOnScreenSaverCheckBoxClick (wxCommandEvent& event)
	{
		if (event.IsChecked() && !ForceAutoDismountCheckBox->IsChecked())
			Gui->ShowWarning ("WARN_PREF_AUTO_DISMOUNT");
	}

	void PreferencesDialog::OnForceAutoDismountCheckBoxClick (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			ForceAutoDismountCheckBox->SetValue (!Gui->AskYesNo (LangString["CONFIRM_NO_FORCED_AUTODISMOUNT"], false, true));
	}

	void PreferencesDialog::OnHotkeyListItemDeselected (wxListEvent& event)
	{
		UpdateHotkeyButtons();
	}

	void PreferencesDialog::OnHotkeyListItemSelected (wxListEvent& event)
	{
		UpdateHotkeyButtons();
		HotkeyTextCtrl->ChangeValue (LangString ["PRESS_A_KEY_TO_ASSIGN"]);
		AssignHotkeyButton->Enable (false);
	}

	void PreferencesDialog::OnOKButtonClick (wxCommandEvent& event)
	{
#ifdef TC_WINDOWS
		HotkeyTextCtrl->SetValidator (wxTextValidator (wxFILTER_NONE));
#endif
		if (!Validate())
			return;

		shared_ptr <Pkcs5Kdf> selectedKdf;
		if (Pkcs5PrfChoice->GetSelection () != 0)
		{
			try
			{
				selectedKdf = Pkcs5Kdf::GetAlgorithm (wstring (Pkcs5PrfChoice->GetStringSelection ()), TrueCryptModeCheckBox->IsChecked ());
			}
			catch (ParameterIncorrect&)
			{
				Gui->ShowWarning ("ALGO_NOT_SUPPORTED_FOR_TRUECRYPT_MODE");
				return;
			}
		}

		TransferDataFromWindow();

		Preferences.DefaultMountOptions.Protection = MountReadOnlyCheckBox->IsChecked() ? VolumeProtection::ReadOnly : VolumeProtection::None;
		Preferences.DefaultMountOptions.FilesystemOptions = FilesystemOptionsTextCtrl->GetValue();
		Preferences.DefaultKeyfiles = *DefaultKeyfilesPanel->GetKeyfiles();

		Preferences.DefaultMountOptions.Kdf = selectedKdf;
		Preferences.DefaultMountOptions.ProtectionKdf = selectedKdf;

		bool securityTokenModuleChanged = (Preferences.SecurityTokenModule != wstring (Pkcs11ModulePathTextCtrl->GetValue()));
		Preferences.SecurityTokenModule = wstring (Pkcs11ModulePathTextCtrl->GetValue());

		Gui->SetPreferences (Preferences);

		try
		{
			if (securityTokenModuleChanged)
			{
				if (Preferences.SecurityTokenModule.IsEmpty())
				{
					if (SecurityToken::IsInitialized())
						SecurityToken::CloseLibrary ();
				}
				else
				{
					Gui->InitSecurityTokenLibrary();
				}
			}
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}

#ifdef TC_WINDOWS
		// Hotkeys
		Hotkey::RegisterList (Gui->GetMainFrame(), Preferences.Hotkeys);
#endif

		EndModal (wxID_OK);
	}

	void PreferencesDialog::OnPreserveTimestampsCheckBoxClick (wxCommandEvent& event)
	{
#ifdef TC_LINUX
		if (!event.IsChecked())
			Gui->ShowInfo (_("Please note that disabling this option may have no effect on volumes mounted using kernel cryptographic services."));
#endif
	}

	void PreferencesDialog::OnRemoveHotkeyButtonClick (wxCommandEvent& event)
	{
#ifdef TC_WINDOWS
		foreach (long item, Gui->GetListCtrlSelectedItems (HotkeyListCtrl))
		{
			Hotkey *hotkey = reinterpret_cast <Hotkey *> (HotkeyListCtrl->GetItemData (item));
			hotkey->VirtualKeyCode = 0;
			hotkey->VirtualKeyModifiers = 0;

			vector <wstring> fields (HotkeyListCtrl->GetColumnCount());
			fields[ColumnHotkeyDescription] = hotkey->Description;
			fields[ColumnHotkey] = hotkey->GetShortcutString();
			Gui->UpdateListCtrlItem (HotkeyListCtrl, item, fields);

			UpdateHotkeyButtons();
		}
#endif
	}

	void PreferencesDialog::OnSelectPkcs11ModuleButtonClick (wxCommandEvent& event)
	{
		list < pair <wstring, wstring> > extensions;
		wxString libExtension;
		libExtension = wxDynamicLibrary::CanonicalizeName (L"x");

#ifdef TC_MACOSX
		extensions.push_back (make_pair (L"dylib", LangString["DLL_FILES"].ToStdWstring()));
#endif
		if (!libExtension.empty())
		{
			extensions.push_back (make_pair (libExtension.Mid (libExtension.find (L'.') + 1).ToStdWstring(), LangString["DLL_FILES"].ToStdWstring()));
			extensions.push_back (make_pair (L"*", L""));
		}

		string libDir;

#ifdef TC_WINDOWS

		char sysDir[TC_MAX_PATH];
		GetSystemDirectoryA (sysDir, sizeof (sysDir));
		libDir = sysDir;

#elif defined (TC_MACOSX)
		libDir = "/usr/local/lib";
#elif defined (TC_UNIX)
		libDir = "/usr/lib";
#endif

		Gui->ShowInfo ("SELECT_PKCS11_MODULE_HELP");

		FilePathList files = Gui->SelectFiles (this, LangString["SELECT_PKCS11_MODULE"], false, false, extensions, libDir);
		if (!files.empty())
			Pkcs11ModulePathTextCtrl->SetValue (wstring (*files.front()));
	}

	void PreferencesDialog::OnTimer ()
	{
#ifdef TC_WINDOWS
		for (UINT vKey = 0; vKey <= 0xFF; vKey++)
		{
			if (GetAsyncKeyState (vKey) < 0)
			{
				bool shift = wxGetKeyState (WXK_SHIFT);
				bool control = wxGetKeyState (WXK_CONTROL);
				bool alt = wxGetKeyState (WXK_ALT);
				bool win = wxGetKeyState (WXK_WINDOWS_LEFT) || wxGetKeyState (WXK_WINDOWS_RIGHT);

				if (!Hotkey::GetVirtualKeyCodeString (vKey).empty())	// If the key is allowed and its name has been resolved
				{
					LastVirtualKeyPressed = vKey;

					HotkeyShiftCheckBox->SetValue (shift);
					HotkeyControlCheckBox->SetValue (control);
					HotkeyAltCheckBox->SetValue (alt);
					HotkeyWinCheckBox->SetValue (win);

					HotkeyTextCtrl->ChangeValue (Hotkey::GetVirtualKeyCodeString (LastVirtualKeyPressed));
					UpdateHotkeyButtons();
					return;
				}
			}
		}
#endif
	}

	void PreferencesDialog::UpdateHotkeyButtons()
	{
		AssignHotkeyButton->Enable (!HotkeyTextCtrl->IsEmpty() && HotkeyListCtrl->GetSelectedItemCount() > 0);

		bool remove = false;
		foreach (long item, Gui->GetListCtrlSelectedItems (HotkeyListCtrl))
		{
			if (reinterpret_cast <Hotkey *> (HotkeyListCtrl->GetItemData (item))->VirtualKeyCode != 0)
				remove = true;
		}
		RemoveHotkeyButton->Enable (remove);
	}
}