public SettingsPage()
{
InitializeComponent();
m_config = ConfigFactory.GetInstance();
//initialize to the current settings
chk_lock_on_suspend.IsToggled = m_config.LockOnSuspend;
chk_save_on_suspend.IsToggled = m_config.SaveOnSuspend;
chk_fingerprint.IsToggled = m_config.UseFingerprint;
//we need to handle the fingerprint enable separately
chk_fingerprint.Toggled += new EventHandler <ToggledEventArgs>((o, e) =>
{
if (chk_fingerprint.IsToggled)
{
IFingerprint fp = FingerprintFactory.GetInstance();
fp.InitReader();
if (fp.IsReady())
{
PasswordPrompt pmt = new PasswordPrompt()
{
IsNavPage = true, PromptTitle = "Verify your Password", PositiveButtonText = "Verify", RestorePage = true
};
pmt.OnPromptSaved += new Prompt.PromptClosedEventListener(() =>
{
if (pmt.Password == null || pmt.Password.Length == 0)
{
return;
}
//attempt to decrypt the private key, just as a verification method
if (!LocknoteMgr.GetInstance().DecryptPrivateKey(pmt.Password))
{ //decryption failed, incorrect password was entered
NotificationFactory.ShortAlert("Password is incorrect");
pmt.Show(((NavigationPage)((HomeMDP)Application.Current.MainPage).Detail));
return;
}
//we verified the password is correct, now we can prompt the user to scan a fingerprint
Page back = Application.Current.MainPage;
Application.Current.MainPage = new FingerprintPage(new EventHandler((oo, ee) =>
{
byte[] data = (byte[])oo; //page returns the encrypted password
if (data != null)
{ //only if was not skipped
//encrypt the password and save it
ConfigFactory.GetInstance().EncryptedPassword = data;
ConfigFactory.GetInstance().UseFingerprint = true;
NotificationFactory.ShortAlert("Fingerprint unlock enabled");
}
else
{
ConfigFactory.GetInstance().EncryptedPassword = new byte[] { 0 };
ConfigFactory.GetInstance().UseFingerprint = false;
chk_fingerprint.IsToggled = false;
}
Application.Current.MainPage = back;
}), fp, pmt.Password);
});
pmt.OnPromptDismissed += new Prompt.PromptClosedEventListener(() =>
{
chk_fingerprint.IsToggled = false;
});
pmt.Show(((NavigationPage)((HomeMDP)Application.Current.MainPage).Detail));
}
}
else
{
ConfigFactory.GetInstance().EncryptedPassword = new byte[] { 0 };
ConfigFactory.GetInstance().UseFingerprint = false;
}
});
//set the button handlers
btn_save.Clicked += new EventHandler((o, e) =>
{
m_config.LockOnSuspend = chk_lock_on_suspend.IsToggled;
m_config.SaveOnSuspend = chk_save_on_suspend.IsToggled;
NotificationFactory.ShortAlert("Settings Saved!");
});
btn_change_password.Clicked += new EventHandler((o, e) =>
{
PasswordEntryView pep = new PasswordEntryView();
pep.OnSave += new EventHandler((oo, ee) =>
{
LocknoteMgr.GetInstance().ReencryptPrivateKey(pep.Text);
((NavigationPage)((HomeMDP)Application.Current.MainPage).Detail).PopAsync();
NotificationFactory.ShortAlert("Password changed");
});
Xamarin.Forms.ContentPage pg = new ContentPage();
pg.Content = pep;
((NavigationPage)((HomeMDP)Application.Current.MainPage).Detail).PushAsync(pg);
});
}
/*
* Decrypt the private key and start the app
*/
public void ResumeApp()
{
//attempt to load the keys if not already loaded
if (!m_ln.Loaded)
{
m_ln.LoadKeys();
}
//prompt the user to enter a password to decrypt the private key
PasswordPrompt p = new PasswordPrompt()
{
NegativeButtonVisible = false, PositiveButtonText = "Decrypt"
};
p.OnPromptSaved += new Prompt.PromptClosedEventListener(() =>
{
if (p.Password == null || p.Password.Length == 0)
{
return;
}
//attempt to decrypt the public key
if (!m_ln.DecryptPrivateKey(p.Password))
{ //decryption failed, incorrect password was entered
NotificationFactory.ShortAlert("Password is incorrect");
p.Show();
return;
}
//erase the entered password
Eraser.SecureErase(p.Password);
p.Password = "";
//private key decrypted, start the app normally
StartAppFinal();
});
//check if fingerprint auth is enabled
if (m_config.UseFingerprint && m_config.EncryptedPassword.Length > 1)
{
//prompt for fingerprint
IFingerprint fp = FingerprintFactory.GetInstance();
fp.InitReader();
if (fp.IsReady())
{
Application.Current.MainPage = new FingerprintPage(new EventHandler((oo, ee) =>
{
byte[] data = (byte[])oo; //page returns the decrypted password
//go to password entry if skipped
if (data == null)
{
p.Show();
return;
}
//decrypt the password
string pass = Encoding.UTF8.GetString(data);
//attempt to decrypt the private key
if (!m_ln.DecryptPrivateKey(pass))
{ //decryption failed
return;
}
//erase the decrypted password
Eraser.SecureErase(pass);
p.Password = "";
//private key decrypted, start the app normally
StartAppFinal();
}), fp, "");
}
}
else
{
p.Show();
}
}
public FirstTimeSetup()
{
InitializeComponent();
//create the password entry view
PasswordEntryView pep = new PasswordEntryView();
pep.OnSave += new EventHandler((o, e) =>
{
//get the public key ASN1
SubjectPublicKeyInfo pubki = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(m_keypair.Public);
//get the private key ASN1
PrivateKeyInfo privki = PrivateKeyInfoFactory.CreatePrivateKeyInfo(m_keypair.Private);
//encrypt the private key
byte[] encPrivKey = Crypto.EncryptKey(privki.GetDerEncoded(), pep.Text);
m_keypair = null;
//delete the old notebooks
if (Directory.Exists(NoteManager.GetNotebookDir()))
{
Directory.Delete(NoteManager.GetNotebookDir(), true);
}
//save the keys to file
KeyManager.SaveKeys(encPrivKey, pubki.GetDerEncoded());
//erase the data
Eraser.SecureErase(encPrivKey);
//ask if the user wants to use a fingerprint
IFingerprint fp = FingerprintFactory.GetInstance();
fp.InitReader();
if (fp.IsReady())
{
Application.Current.MainPage = new FingerprintPage(new EventHandler((oo, ee) =>
{
byte[] data = (byte[])oo; //page returns the encrypted password
if (data != null)
{ //only if was not skipped
//encrypt the password and save it
ConfigFactory.GetInstance().EncryptedPassword = data;
ConfigFactory.GetInstance().UseFingerprint = true;
}
else
{
ConfigFactory.GetInstance().EncryptedPassword = new byte[] { 0 };
ConfigFactory.GetInstance().UseFingerprint = false;
}
//trigger the setup complete event
if (OnSetupComplete != null)
{
OnSetupComplete(this, new EventArgs());
}
}), fp, pep.Text);
}
else
{
//trigger the setup complete event
if (OnSetupComplete != null)
{
OnSetupComplete(this, new EventArgs());
}
}
});
//create the activity indicator layout
StackLayout actLayout = new StackLayout()
{
VerticalOptions = LayoutOptions.CenterAndExpand
};
ActivityIndicator actInd = new ActivityIndicator();;
actLayout.Children.Add(actInd);
actLayout.Children.Add(new Label()
{
Text = "Generating key pair", TextColor = Color.DarkGray, HorizontalTextAlignment = TextAlignment.Center
});
TapRandomizer tapRnd = new TapRandomizer();
tapRnd.OnRandomized += new EventHandler((o, e) =>
{
m_seed = tapRnd.Seed;
//show wait animation
actInd.IsRunning = true;
this.Content = actLayout;
//generate the key pair
Crypto.StartGenerateKeypair(m_seed, new Crypto.GenCompleteEventHandler((keypair) =>
{
m_keypair = keypair;
//hide wait animation
actInd.IsRunning = false;
//show the password entry page
this.Content = pep;
}));
});
this.Content = tapRnd;
}
