/*
  zip_unchange_data.c -- undo helper function
  Copyright (C) 1999-2014 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <libzip@nih.at>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distributi
/*
 Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.

 Governed by the TrueCrypt License 3.0 the full text of which is contained in
 the file License.txt included in TrueCrypt 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(), 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");
	}
}