/*
 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) 2013-2015 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 "Volume/EncryptionModeXTS.h"
#include "Volume/EncryptionTest.h"
#include "Main/GraphicUserInterface.h"
#include "EncryptionTestDialog.h"

namespace VeraCrypt
{
	EncryptionTestDialog::EncryptionTestDialog (wxWindow* parent)
		: EncryptionTestDialogBase (parent)
	{
		EncryptionAlgorithms = EncryptionAlgorithm::GetAvailableAlgorithms();
		foreach (shared_ptr <EncryptionAlgorithm> ea, EncryptionAlgorithms)
		{
			if (!ea->IsDeprecated())
				EncryptionAlgorithmChoice->Append (ea->GetName(true), ea.get());
		}

		EncryptionAlgorithmChoice->Select (0);
		Reset();

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

	void EncryptionTestDialog::EncryptOrDecrypt (bool encrypt)
	{
		try
		{
			bool xts = XtsModeCheckBox->IsChecked();

			shared_ptr <EncryptionAlgorithm> ea = GetSelectedEncryptionAlgorithm();

			Buffer key;
			GetTextCtrlData (KeyTextCtrl, key);
			
			if (key.Size() != ea->GetKeySize())
				throw_err (LangString["TEST_KEY_SIZE"]);

			ea->SetKey (key);

			Buffer data;
			GetTextCtrlData (encrypt ? PlainTextTextCtrl : CipherTextTextCtrl, data);

			if (data.Size() != ea->GetMaxBlockSize())
				throw_err (LangString[encrypt ? "TEST_PLAINTEXT_SIZE" : "TEST_CIPHERTEXT_SIZE"]);

			if (xts)
			{
				Buffer secondaryKey;
				GetTextCtrlData (SecondaryKeyTextCtrl, secondaryKey);

				if (secondaryKey.Size() != ea->GetKeySize())
					throw_err (LangString["TEST_INCORRECT_SECONDARY_KEY_SIZE"]);

				uint64 dataUnitNumber;
				size_t blockNumber;

				try
				{
					dataUnitNumber = StringConverter::ToUInt64 (wstring (DataUnitNumberTextCtrl->GetValue()));
				}
				catch (...)
				{
					DataUnitNumberTextCtrl->SetFocus();
					throw StringConversionFailed (SRC_POS);
				}

				try
				{
					blockNumber = StringConverter::ToUInt32 (wstring (BlockNumberTextCtrl->GetValue()));
					if (blockNumber > 31)
					{
						blockNumber = 31;
						BlockNumberTextCtrl->SetValue (L"31");
					}
				}
				catch (...)
				{
					BlockNumberTextCtrl->SetFocus();
					throw StringConversionFailed (SRC_POS);
				}

				shared_ptr <EncryptionMode> xts (new EncryptionModeXTS);
				xts->SetKey (secondaryKey);
				ea->SetMode (xts);

				Buffer sector (ENCRYPTION_DATA_UNIT_SIZE);
				BufferPtr block = sector.GetRange (blockNumber * ea->GetMaxBlockSize(), ea->GetMaxBlockSize());
				
				block.CopyFrom (data);

				if (encrypt)
					ea->EncryptSectors (sector, dataUnitNumber, 1, sector.Size());
				else
					ea->DecryptSectors (sector, dataUnitNumber, 1, sector.Size());

				data.CopyFrom (block);
			}
			else
			{
				if (encrypt)
					ea->GetCiphers().front()->EncryptBlock (data);
				else
					ea->GetCiphers().front()->DecryptBlock (data);
			}

			SetTextCtrlData (encrypt ? CipherTextTextCtrl : PlainTextTextCtrl, data);
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	shared_ptr <EncryptionAlgorithm> EncryptionTestDialog::GetSelectedEncryptionAlgorithm () const
	{
		return Gui->GetSelectedData <EncryptionAlgorithm> (EncryptionAlgorithmChoice)->GetNew();
	}
	
	void EncryptionTestDialog::GetTextCtrlData (wxTextCtrl *textCtrl, Buffer &buffer) const
	{
		vector <byte> data;
		string dataStr = StringConverter::ToSingle (wstring (textCtrl->GetValue()));

		for (size_t i = 0; i < dataStr.size() / 2; ++i)
		{
			unsigned int dataByte;
			if (sscanf (dataStr.substr (i * 2, 2).c_str(), "%x", &dataByte) != 1)
			{
				textCtrl->SetFocus();
				throw StringConversionFailed (SRC_POS);
			}

			data.push_back ((byte) dataByte);
		}

		if (data.empty())
			return;

		buffer.CopyFrom (ConstBufferPtr (&data.front(), data.size()));
	}

	void EncryptionTestDialog::OnAutoTestAllButtonClick (wxCommandEvent& event)
	{
		try
		{
			{
				wxBusyCursor busy;
				EncryptionTest::TestAll();
			}

			Gui->ShowInfo ("TESTS_PASSED");
		}
		catch (Exception &e)
		{
			Gui->ShowError (e);
			Gui->ShowError ("TESTS_FAILED");
		}
	}

	void EncryptionTestDialog::OnEncryptionAlgorithmSelected ()
	{
		shared_ptr <EncryptionAlgorithm> ea = GetSelectedEncryptionAlgorithm();

		KeySizeStaticText->SetLabel (StringFormatter (L"{0} {1}", (uint32) ea->GetKeySize() * 8, LangString["BITS"]));

		Buffer key (ea->GetKeySize());
		key.Zero();
		SetTextCtrlData (KeyTextCtrl, key);
		SetTextCtrlData (SecondaryKeyTextCtrl, key);

		Buffer block (ea->GetMaxBlockSize());
		block.Zero();
		SetTextCtrlData (PlainTextTextCtrl, block);
		SetTextCtrlData (CipherTextTextCtrl, block);

		if (ea->GetCiphers().size() > 1)
		{
			XtsModeCheckBox->Disable();
			XtsModeCheckBox->SetValue (true);
			SecondaryKeyTextCtrl->Enable (true);
			DataUnitNumberTextCtrl->Enable (true);
			BlockNumberTextCtrl->Enable (true);
		}
		else
			XtsModeCheckBox->Enable();
	}

	void EncryptionTestDialog::OnXtsModeCheckBoxClick (wxCommandEvent& event)
	{
		bool enabled = event.IsChecked();
		SecondaryKeyTextCtrl->Enable (enabled);
		DataUnitNumberTextCtrl->Enable (enabled);
		BlockNumberTextCtrl->Enable (enabled);
	}

	void EncryptionTestDialog::SetTextCtrlData (wxTextCtrl *textCtrl, const BufferPtr &data)
	{
		wstring str;
		for (size_t i = 0; i < data.Size(); i++)
		{
			char strBuf[3];
			sprintf (strBuf, "%02x", (int) data[i]);
			str += StringConverter::ToWide (strBuf);
		}

		textCtrl->SetValue (str);
	}

	void EncryptionTestDialog::Reset ()
	{
		OnEncryptionAlgorithmSelected();

		DataUnitNumberTextCtrl->SetValue (L"0");
		BlockNumberTextCtrl->SetValue (L"0");
	}
}