/*
 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 "Crc32.h"
#include "EncryptionModeXTS.h"
#include "Pkcs5Kdf.h"
#include "Pkcs5Kdf.h"
#include "VolumeHeader.h"
#include "VolumeException.h"
#include "Common/Crypto.h"

namespace VeraCrypt
{
	VolumeHeader::VolumeHeader (uint32 size)
	{
		Init();
		HeaderSize = size;
		EncryptedHeaderDataSize = size - EncryptedHeaderDataOffset;
	}

	VolumeHeader::~VolumeHeader ()
	{
		Init();
	}

	void VolumeHeader::Init ()
	{
		VolumeKeyAreaCrc32 = 0;
		VolumeCreationTime = 0;
		HeaderCreationTime = 0;
		mVolumeType = VolumeType::Unknown;
		HiddenVolumeDataSize = 0;
		VolumeDataSize = 0;
		EncryptedAreaStart = 0;
		EncryptedAreaLength = 0;
		Flags = 0;
		SectorSize = 0;
	}

	void VolumeHeader::Create (const BufferPtr &headerBuffer, VolumeHeaderCreationOptions &options)
	{
		if (options.DataKey.Size() != options.EA->GetKeySize() * 2 || options.Salt.Size() != GetSaltSize())
			throw ParameterIncorrect (SRC_POS);

		headerBuffer.Zero();

		HeaderVersion = CurrentHeaderVersion;
		RequiredMinProgramVersion = CurrentRequiredMinProgramVersion;

		DataAreaKey.Zero();
		DataAreaKey.CopyFrom (options.DataKey);

		VolumeCreationTime = 0;
		HiddenVolumeDataSize = (options.Type == VolumeType::Hidden ? options.VolumeDataSize : 0);
		VolumeDataSize = options.VolumeDataSize;

		EncryptedAreaStart = options.VolumeDataStart;
		EncryptedAreaLength = options.VolumeDataSize;

		SectorSize = options.SectorSize;

		if (SectorSize < TC_MIN_VOLUME_SECTOR_SIZE
			|| SectorSize > TC_MAX_VOLUME_SECTOR_SIZE
			|| SectorSize % ENCRYPTION_DATA_UNIT_SIZE != 0)
		{
			throw ParameterIncorrect (SRC_POS);
		}

		EA = options.EA;
		shared_ptr <EncryptionMode> mode (new EncryptionModeXTS ());
		EA->SetMode (mode);

		EncryptNew (headerBuffer, options.Salt, options.HeaderKey, options.Kdf);
	}

	bool VolumeHeader::Decrypt (const ConstBufferPtr &encryptedData, const VolumePassword &password, int pim, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, const Pkcs5KdfList &keyDerivationFunctions, const EncryptionAlgorithmList &encryptionAlgorithms, const EncryptionModeList &encryptionModes)
	{
		if (password.Size() < 1)
			throw PasswordEmpty (SRC_POS);

		ConstBufferPtr salt (encryptedData.GetRange (SaltOffset, SaltSize));
		SecureBuffer header (EncryptedHeaderDataSize);
		SecureBuffer headerKey (GetLargestSerializedKeySize());

		foreach (shared_ptr <Pkcs5Kdf> pkcs5, keyDerivationFunctions)
		{
			if (kdf && (kdf->GetName() != pkcs5->GetName()))
				continue;

			pkcs5->DeriveKey (headerKey, password, pim, salt);

			foreach (shared_ptr <EncryptionMode> mode, encryptionModes)
			{
				if (typeid (*mode) != typeid (EncryptionModeXTS))
					mode->SetKey (headerKey.GetRange (0, mode->GetKeySize()));

				foreach (shared_ptr <EncryptionAlgorithm> ea, encryptionAlgorithms)
				{
					if (!ea->IsModeSupported (mode))
						continue;

					if (typeid (*mode) == typeid (EncryptionModeXTS))
					{
						ea->SetKey (headerKey.GetRange (0, ea->GetKeySize()));
						
						mode = mode->GetNew();
						mode->SetKey (headerKey.GetRange (ea->GetKeySize(), ea->GetKeySize()));
					}
					else
					{
						ea->SetKey (headerKey.GetRange (LegacyEncryptionModeKeyAreaSize, ea->GetKeySize()));
					}

					ea->SetMode (mode);

					header.CopyFrom (encryptedData.GetRange (EncryptedHeaderDataOffset, EncryptedHeaderDataSize));
					ea->Decrypt (header);

					if (Deserialize (header, ea, mode, truecryptMode))
					{
						EA = ea;
						Pkcs5 = pkcs5;
						return true;
					}
				}
			}
		}

		return false;
	}

	bool VolumeHeader::Deserialize (const ConstBufferPtr &header, shared_ptr <EncryptionAlgorithm> &ea, shared_ptr <EncryptionMode> &mode, bool truecryptMode)
	{
		if (header.Size() != EncryptedHeaderDataSize)
			throw ParameterIncorrect (SRC_POS);

		if (truecryptMode && (header[0] != 'T' ||
			header[1] != 'R' ||
			header[2] != 'U' ||
			header[3] != 'E'))
			return false;

		if (!truecryptMode && (header[0] != 'V' ||
			header[1] != 'E' ||
			header[2] != 'R' ||
			header[3] != 'A'))
			return false;

		size_t offset = 4;
		HeaderVersion =	DeserializeEntry <uint16> (header, offset);

		if (HeaderVersion < MinAllowedHeaderVersion)
			return false;

		if (HeaderVersion > CurrentHeaderVersion)
			throw HigherVersionRequired (SRC_POS);

		if (HeaderVersion >= 4
			&& Crc32::ProcessBuffer (header.GetRange (0, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC))
			!= DeserializeEntryAt <uint32> (header, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC))
		{
			return false;
		}

		RequiredMinProgramVersion = DeserializeEntry <uint16> (header, offset);
		
		if (!truecryptMode && (RequiredMinProgramVersion > Version::Number()))
			throw HigherVersionRequired (SRC_POS);

		if (truecryptMode)
		{
			if (RequiredMinProgramVersion <style>.highlight .hll { background-color: #ffffcc }
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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="cm">/*</span>
<span class="cm"> Derived from source code of TrueCrypt 7.1a, which is</span>
<span class="cm"> Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed</span>
<span class="cm"> by the TrueCrypt License 3.0.</span>

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

<span class="cp">#ifndef TC_HEADER_Main_Forms_DeviceSelectionDialog</span>
<span class="cp">#define TC_HEADER_Main_Forms_DeviceSelectionDialog</span>

<span class="cp">#include</span> <span class="cpf">&quot;Forms.h&quot;</span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf">&quot;Main/Main.h&quot;</span><span class="cp"></span>

<span class="n">namespace</span> <span class="n">VeraCrypt</span>
<span class="p">{</span>
	<span class="n">class</span> <span class="nl">DeviceSelectionDialog</span> <span class="p">:</span> <span class="n">public</span> <span class="n">DeviceSelectionDialogBase</span>
	<span class="p">{</span>
	<span class="nl">public</span><span class="p">:</span>
		<span class="n">DeviceSelectionDialog</span> <span class="p">(</span><span class="n">wxWindow</span><span class="o">*</span> <span class="n">parent</span><span class="p">);</span>

		<span class="n">HostDeviceList</span> <span class="n">DeviceList</span><span class="p">;</span>
		<span class="n">HostDevice</span> <span class="n">SelectedDevice</span><span class="p">;</span>

	<span class="nl">protected</span><span class="p">:</span>
		<span class="k">enum</span>
		<span class="p">{</span>
			<span class="n">ColumnDevice</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
<span class="cp">#ifdef TC_WINDOWS</span>
			<span class="n">ColumnDrive</span><span class="p">,</span>
<span class="cp">#endif</span>
			<span class="n">ColumnSize</span><span class="p">,</span>
<span class="cp">#ifdef TC_WINDOWS</span>
			<span class="n">ColumnName</span>
<span class="cp">#else</span>
			<span class="n">ColumnMountPoint</span>
<span class="cp">#endif</span>
		<span class="p">};</span>

		<span class="kt">void</span> <span class="nf">OnListItemActivated</span> <span class="p">(</span><span class="n">wxListEvent</span><span class="o">&amp;</span> <span class="n">event</span><span class="p">);</span>
		<span class="kt">void</span> <span class="nf">OnListItemDeselected</span> <span class="p">(</span><span class="n">wxListEvent</span><span class="o">&amp;</span> <span class="n">event</span><span class="p">);</span>
		<span class="kt">void</span> <span class="nf">OnListItemSelected</span> <span class="p">(</span><span class="n">wxListEvent</span><span class="o">&amp;</span> <span class="n">event</span><span class="p">);</span>
	<span class="p">};</span>
<span class="p">}</span>

<span class="cp">#endif </span><span class="c1">// TC_HEADER_Main_Forms_DeviceSelectionDialog</span>
</pre></div>
</code></pre></td></tr></table>
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