VeraCrypt - Free Open source disk encryption with strong security for the Paranoid


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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 "Main/GraphicUserInterface.h"
#include "Main/VolumeHistory.h"
#include "VolumeLocationWizardPage.h"

namespace VeraCrypt
{
	VolumeLocationWizardPage::VolumeLocationWizardPage (wxPanel* parent, VolumeHostType::Enum hostType, bool selectExisting)
		: VolumeLocationWizardPageBase (parent),
		SelectExisting (selectExisting)
	{
		switch (hostType)
		{
		case VolumeHostType::Device:
			SelectFileButton->Show (false);
			break;

		case VolumeHostType::File:
			SelectDeviceButton->Show (false);
			break;

		default:
			break;
		}

		Gui->PreferencesUpdatedEvent.Connect (EventConnector <VolumeLocationWizardPage> (this, &VolumeLocationWizardPage::OnPreferencesUpdated));
		VolumeHistory::ConnectComboBox (VolumePathComboBox);

		NoHistoryCheckBox->SetValue (!Gui->GetPreferences().SaveHistory);
	}

	VolumeLocationWizardPage::~VolumeLocationWizardPage ()
	{
		Gui->PreferencesUpdatedEvent.Disconnect (this);
		VolumeHistory::DisconnectComboBox (VolumePathComboBox);
	}

	void VolumeLocationWizardPage::OnNoHistoryCheckBoxClick (wxCommandEvent& event)
	{
		UserPreferences prefs = Gui->GetPreferences();
		prefs.SaveHistory = !event.IsChecked();
		Gui->SetPreferences (prefs);

		if (event.IsChecked())
		{
			try
			{
				VolumeHistory::Clear();
			}
			catch (exception &e) { Gui->ShowError (e); }
		}
	}

	void VolumeLocationWizardPage::OnPageChanging (bool forward)
	{
		if (forward)
		{
			VolumePath path = GetVolumePath();
			if (!path.IsEmpty())
				VolumeHistory::Add (path);
		}
	}

	void VolumeLocationWizardPage::OnPreferencesUpdated (EventArgs &args)
	{
		NoHistoryCheckBox->SetValue (!Gui->GetPreferences().SaveHistory);
	}

	void VolumeLocationWizardPage::OnSelectFileButtonClick (wxCommandEvent& event)
	{
		FilePath path = Gui->SelectVolumeFile (this, !SelectExisting);

		if (!path.IsEmpty())
			SetVolumePath (path);
	}

	void VolumeLocationWizardPage::OnSelectDeviceButtonClick (wxCommandEvent& event)
	{
		DevicePath path = Gui->SelectDevice (this);

		if (!path.IsEmpty())
			SetVolumePath (path);
	}

	void VolumeLocationWizardPage::SetVolumePath (const VolumePath &path)
	{
		VolumePathComboBox->SetValue (wstring (path));
		PageUpdatedEvent.Raise();
	}
}
C	Ciphertext block
DK()	Decryption algorithm using encryption/decryption key K
EK()	Encryption algorithm using encryption/decryption key K
H()	Hash function
i	Block index for n-bit blocks; n is context-dependent
K	Cryptographic key
^	Bitwise exclusive-OR operation (XOR)
⊕	Modulo 2n addition, where n is the bit size of the left-most operand and of the resultant value (e.g., if the left operand is a 1-bit value, and the right operand is a 2-bit value, then: 1 ⊕ 0 = 1; 1 ⊕ 1 = 0; 1 ⊕ 2 = 1; 1 ⊕ 3 = 0; 0 ⊕ 0 = 0; 0 ⊕ 1 = 1; 0 ⊕ 2 = 0; 0 ⊕ 3 = 1)
⊗	Modular multiplication of two polynomials over the binary field GF(2) modulo x128+x7+x2+x+1 (GF stands for Galois Field)
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