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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2012 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.IO;
using System.Diagnostics;
using KeePass.UI;
using KeePass.Resources;
using KeePassLib.Cryptography;
using KeePassLib.Cryptography.PasswordGenerator;
using KeePassLib.Utility;
namespace KeePass.Forms
{
public partial class EntropyForm : Form
{
private byte[] m_pbEntropy = null;
private LinkedList<uint> m_llPool = new LinkedList<uint>();
public byte[] GeneratedEntropy
{
get { return m_pbEntropy; }
}
public static byte[] CollectEntropyIfEnabled(PwProfile pp)
{
if(!pp.CollectUserEntropy) return null;
EntropyForm ef = new EntropyForm();
if(UIUtil.ShowDialogNotValue(ef, DialogResult.OK)) return null;
byte[] pbGen = ef.GeneratedEntropy;
UIUtil.DestroyForm(ef);
return pbGen;
}
public EntropyForm()
{
InitializeComponent();
Program.Translation.ApplyTo(this);
}
private void OnFormLoad(object sender, EventArgs e)
{
GlobalWindowManager.AddWindow(this);
BannerFactory.CreateBannerEx(this, m_bannerImage,
Properties.Resources.B48x48_Binary, KPRes.EntropyTitle,
KPRes.EntropyDesc);
this.Icon = new Icon("/usr/share/keepass2/KeePass.ico");
this.Text = KPRes.EntropyTitle;
UpdateUIState();
}
private void UpdateUIState()
{
int nBits = m_llPool.Count / 8;
m_lblStatus.Text = nBits.ToString() + " " + KPRes.Bits;
if(nBits > 256) { Debug.Assert(false); m_pbGenerated.Value = 100; }
else m_pbGenerated.Value = (nBits * 100) / 256;
}
private void OnRandomMouseMove(object sender, MouseEventArgs e)
{
if(m_llPool.Count >= 2048) return;
uint ul = (uint)((e.X << 8) ^ e.Y);
ul ^= (uint)(Environment.TickCount << 16);
m_llPool.AddLast(ul);
UpdateUIState();
}
private void OnBtnOK(object sender, EventArgs e)
{
MemoryStream ms = new MemoryStream();
// Prevent empty / low entropy buffer
byte[] pbGuid = Guid.NewGuid().ToByteArray();
ms.Write(pbGuid, 0, pbGuid.Length);
foreach(uint ln in m_llPool)
ms.Write(MemUtil.UInt32ToBytes(ln), 0, 4);
if(m_tbEdit.Text.Length > 0)
{
byte[] pbUTF8 = StrUtil.Utf8.GetBytes(m_tbEdit.Text);
ms.Write(pbUTF8, 0, pbUTF8.Length);
}
byte[] pbColl = ms.ToArray();
SHA256Managed sha256 = new SHA256Managed();
m_pbEntropy = sha256.ComputeHash(pbColl);
CryptoRandom.Instance.AddEntropy(pbColl); // Will be hashed using SHA-512
ms.Close();
}
private void OnBtnCancel(object sender, EventArgs e)
{
}
private void OnFormClosed(object sender, FormClosedEventArgs e)
{
GlobalWindowManager.RemoveWindow(this);
}
}
}
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