VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Main/Forms/KeyfileGeneratorDialog.cpp
blob: 885f56d2a35166fae1d87ae77243fed2d0bbb604 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 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 "Volume/Hash.h"
#include "KeyfileGeneratorDialog.h"

namespace VeraCrypt
{
	KeyfileGeneratorDialog::KeyfileGeneratorDialog (wxWindow* parent) : KeyfileGeneratorDialogBase (parent)
	{
		RandomNumberGenerator::Start();

		Hashes = Hash::GetAvailableAlgorithms();
		foreach (shared_ptr <Hash> hash, Hashes)
		{
			if (!hash->IsDeprecated())
				HashChoice->Append (hash->GetName(), hash.get());
		}

		HashChoice->Select (0);
		RandomNumberGenerator::SetHash (Gui->GetSelectedData <Hash> (HashChoice)->GetNew());

		HideBytes (RandomPoolStaticText, 24);
		MouseStaticText->Wrap (Gui->GetCharWidth (MouseStaticText) * 70);

		CollectedEntropy->SetRange (RNG_POOL_SIZE * 8);

		MainSizer->SetMinSize (wxSize (-1, Gui->GetCharHeight (this) * 24));

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

		MouseEventsCounter = 0;

		foreach (wxWindow *c, this->GetChildren())
			c->Connect (wxEVT_MOTION, wxMouseEventHandler (KeyfileGeneratorDialog::OnMouseMotion), nullptr, this);
	}

	KeyfileGeneratorDialog::~KeyfileGeneratorDialog ()
	{
	}

	void KeyfileGeneratorDialog::OnGenerateButtonClick (wxCommandEvent& event)
	{
		try
		{
			int keyfilesCount = NumberOfKeyfiles->GetValue();
			int keyfilesSize = KeyfilesSize->GetValue();
			bool useRandomSize = RandomSizeCheckBox->IsChecked();
			wxString keyfileBaseName = KeyfilesBaseName->GetValue();
			keyfileBaseName.Trim(true);
			keyfileBaseName.Trim(false);

			if (keyfileBaseName.IsEmpty())
			{
				Gui->ShowWarning("KEYFILE_EMPTY_BASE_NAME");
				return;
			}

			wxFileName baseFileName = wxFileName::FileName (keyfileBaseName);
			if (!baseFileName.IsOk())
			{
				Gui->ShowWarning("KEYFILE_INVALID_BASE_NAME");
				return;
			}

			DirectoryPath keyfilesDir = Gui->SelectDirectory (Gui->GetActiveWindow(), LangString["SELECT_KEYFILE_GENERATION_DIRECTORY"], false);
			if (keyfilesDir.IsEmpty())
				return;

			wxFileName dirFileName = wxFileName::DirName( wstring(keyfilesDir).c_str() );
			if (!dirFileName.IsDirWritable ())
			{
				Gui->ShowWarning(L"You don't have write permission on the selected directory");
				return;
			}

			wxBusyCursor busy;
			for (int i = 0; i < keyfilesCount; i++)
			{
				int bufferLen;
				if (useRandomSize)
				{
					SecureBuffer sizeBuffer (sizeof(int));
					RandomNumberGenerator::GetData (sizeBuffer, true);

					memcpy(&bufferLen, sizeBuffer.Ptr(), sizeof(int));

					/* since keyfilesSize < 1024 * 1024, we mask with 0x000FFFFF */
					bufferLen = (long) (((unsigned long) bufferLen) & 0x000FFFFF);

					bufferLen %= ((1024*1024 - 64) + 1);
					bufferLen += 64;
				}
				else
					bufferLen = keyfilesSize;

				SecureBuffer keyfileBuffer (bufferLen);
				RandomNumberGenerator::GetData (keyfileBuffer, true);

				wstringstream convertStream;
				convertStream << i;
				wxString suffix = L"_";
				suffix += convertStream.str().c_str();

				wxFileName keyfileName;
				if (i == 0)
				{
					keyfileName.Assign(dirFileName.GetPath(), keyfileBaseName);
				}
				else
				{
					if (baseFileName.HasExt())
					{
						keyfileName.Assign(dirFileName.GetPath(), baseFileName.GetName() + suffix + L"." + baseFileName.GetExt());
					}
					else
					{
						keyfileName.Assign(dirFileName.GetPath(), keyfileBaseName + suffix);
					}
				}

				if (keyfileName.Exists())
				{
					wxString msg = wxString::Format(LangString["KEYFILE_ALREADY_EXISTS"], keyfileName.GetFullPath());
					if (!Gui->AskYesNo (msg, false, true))
						return;
				}

				{
					FilePath keyfilePath((const wchar_t*) keyfileName.GetFullPath().c_str());
					File keyfile;
					keyfile.Open (keyfilePath, File::CreateWrite);
					keyfile.Write (keyfileBuffer);
				}

			}
			Gui->ShowInfo ("KEYFILE_CREATED");
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void KeyfileGeneratorDialog::OnHashSelected (wxCommandEvent& event)
	{
		RandomNumberGenerator::SetHash (Gui->GetSelectedData <Hash> (HashChoice)->GetNew());
	}

	void KeyfileGeneratorDialog::OnMouseMotion (wxMouseEvent& event)
	{
		event.Skip();

		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&event), sizeof (event)));

		long coord = event.GetX();
		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&coord), sizeof (coord)));
		coord = event.GetY();
		RandomNumberGenerator::AddToPool (ConstBufferPtr (reinterpret_cast <byte *> (&coord), sizeof (coord)));

		if (ShowRandomPoolCheckBox->IsChecked())
			ShowBytes (RandomPoolStaticText, RandomNumberGenerator::PeekPool().GetRange (0, 24));
		else
			HideBytes (RandomPoolStaticText, 24);

		/* conservative estimate: 1 mouse move event brings 1 bit of entropy
		 * https://security.stackexchange.com/questions/32844/for-how-much-time-should-i-randomly-move-the-mouse-for-generating-encryption-key/32848#32848
		 */
		ScopeLock lock (AccessMutex);
		if (MouseEventsCounter < (RNG_POOL_SIZE * 8))
			CollectedEntropy->SetValue (++MouseEventsCounter);
	}

	void KeyfileGeneratorDialog::OnShowRandomPoolCheckBoxClicked (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			HideBytes (RandomPoolStaticText, 24);
	}

	void KeyfileGeneratorDialog::OnRandomSizeCheckBoxClicked (wxCommandEvent& event)
	{
		if (!event.IsChecked())
			KeyfilesSize->Enable();
		else
			KeyfilesSize->Disable();
	}

	void KeyfileGeneratorDialog::ShowBytes (wxStaticText *textCtrl, const ConstBufferPtr &buffer, bool appendDots)
	{
		wxString str;

		for (size_t i = 0; i < buffer.Size(); ++i)
		{
			str += wxString::Format (L"%02X", buffer[i]);
		}

		if (appendDots)
			str += L"..";

		textCtrl->SetLabel (str.c_str());

		for (size_t i = 0; i < str.size(); ++i)
		{
			str[i] = L'X';
		}
	}

	void KeyfileGeneratorDialog::HideBytes (wxStaticText *textCtrl, size_t len)
	{
		wxString str;

		for (size_t i = 0; i < len + 1; ++i)
		{
			str += L"**";
		}

		textCtrl->SetLabel (str.c_str());
	}
}