/// <summary>
/// Register new user and saves all data in json file
/// </summary>
/// <param name="user"></param>
/// <returns>0 - if registration went successful,
/// 1 - if some error occured,
/// 2 - if username is already used</returns>
public static int Register(User user)
{
string hashedUsername = DataCryptography.SHA512(user.GetUsername());
if (IsUsernameNotTaken(hashedUsername))
{
User userHashedData = new User(DataCryptography.SHA512(user.GetFirstName()),
DataCryptography.SHA512(user.GetLastName()),
hashedUsername,
DataCryptography.SHA512(user.GetPassword()),
DataCryptography.SHA512(user.GetBirthday()),
user.GetQuestion(),
DataCryptography.SHA512(user.GetAnswer().ToLower()),
DataCryptography.SHA512(DataCryptography.GenerateAesKey(user.GetUsername(),
user.GetPassword(),
user.GetQuestion(),
user.GetAnswer().ToLower())));
if (IOClass.SaveNewUser(userHashedData, user.GetUsername()))
{
return(0);
}
else
{
return(1);
}
}
return(2);
}
/// <summary>
/// Provides files recovery feature
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnRecoverFiles_Click(object sender, RoutedEventArgs e)
{
string securityAnswer = textBoxSecurityAnswer.Text.ToLower();
string password = textBoxRecoveryPassword.Password;
if (EncryptedFiles.Count.Equals(0))
{
MessageBox.Show("You have no files to recover.", "No encrypted files found", MessageBoxButton.OK, MessageBoxImage.Information);
}
else
{
if (DataCryptography.SHA512(securityAnswer).Equals(LoggedUser.GetAnswer()) && DataCryptography.SHA512(password).Equals(LoggedUser.GetPassword()))
{
MessageBoxResult result = MessageBox.Show("Do you want to recover your files? All your program settings and keys will be deleted.", "Files recovery system", MessageBoxButton.YesNo, MessageBoxImage.Question);
if (result.Equals(MessageBoxResult.Yes))
{
string aesKey = DataCryptography.SHA512(DataCryptography.GenerateAesKey(this.Username,
password,
LoggedUser.GetQuestion(),
securityAnswer));
List <string> tempEncryptedFiles = new List <string>(EncryptedFiles);
EncryptedFiles.Clear();
Files.Clear();
Folders.Clear();
TrustedDevices.Clear();
var decryptionTask = Task.Run(() =>
{
foreach (string encryptedFilePath in tempEncryptedFiles)
{
string filePath = DataCryptography.FileDecrypt(encryptedFilePath, aesKey);
}
});
decryptionTask.Wait();
LoggedUser.SetPublicKeyXmlString(String.Empty);
LoggedUser.SetAesKey(aesKey);
IOClass.SaveFilesList(Files, this.UserFilesFilepath);
IOClass.SaveFilesList(EncryptedFiles, this.UserEncryptedFilesFilepath);
IOClass.SaveFoldersList(Folders, this.UserFoldersFilepath);
IOClass.SaveTrustedDevicesList(TrustedDevices, this.UserKeyDataFilepath);
IOClass.UpdateUser(LoggedUser);
bindFilesListBox();
bindFoldersListBox();
MessageBox.Show("Your files are decrypted now.", "Files recovery system", MessageBoxButton.OK, MessageBoxImage.Information);
}
}
else
{
MessageBox.Show("Security answer or password incorrect!", "Files recovery system", MessageBoxButton.OK, MessageBoxImage.Warning);
}
}
}
/// <summary>
/// Checks user's credentials and allows to log in
/// </summary>
/// <param name="login"></param>
/// <param name="password"></param>
/// <returns>True - if credentials were ok,
/// False - if credentials were wrong</returns>
public static bool Login(string login, string password)
{
List <User> usersList = IOClass.ReadUsersList();
string loginHash = DataCryptography.SHA512(login);
string passwordHash = DataCryptography.SHA512(password);
foreach (User user in usersList)
{
if (user.GetUsername().Equals(loginHash))
{
if (user.GetPassword().Equals(passwordHash))
{
return(true);
}
}
}
return(false);
}
/*
* Stworzyć lepszą walidację zaznaczonych elementów listboxów by operacje nie były dozwolone na obiektach null, które powodują NullReferenceException
*/
#region Constructor
/// <summary>
/// Sets default values and starts a new task which checks connected devices
/// </summary>
public MainWindow(string username)
{
InitializeComponent();
DidUserLoggedUnauthorized = true;
DeviceListChanged = false;
deleteTrustedDeviceBtn.IsEnabled = false;
labelUsername.Content = "Hello " + username;
RsaPrivateKey = string.Empty;
AuthorizationStatus = false;
this.Username = username;
List <User> usersList = IOClass.ReadUsersList();
string hashedUsername = DataCryptography.SHA512(username);
bindFilesListBox();
bindFoldersListBox();
foreach (User user in usersList)
{
if (user.GetUsername().Equals(hashedUsername))
{
LoggedUser = user;
}
}
labelSecurityQuestion.Content = LoggedUser.GetQuestion();
this.UserFilesFilepath = @"C:\PAAK\" + username + @"\files.json";
this.UserFoldersFilepath = @"C:\PAAK\" + username + @"\folders.json";
this.UserKeyDataFilepath = @"C:\PAAK\" + username + @"\data.json";
this.UserEncryptedFilesFilepath = @"C:\PAAK\" + username + @"\encryptedFiles.json";
var uiSyncContext = SynchronizationContext.Current;
var loopTask = Task.Run(() =>
{
while (true)
{
Task.Delay(1000);
UpdateConnectedDevices();
if (DeviceListChanged)
{
if (ConnectedTrustedDevices != null)
{
if (ConnectedTrustedDevices.Count.Equals(1))
{
AuthorizationStatus = true;
if (RsaPrivateKey.Equals(string.Empty))
{
RsaPrivateKey = IOClass.ReadPrivateKeyFromDeviceToString(ConnectedTrustedDevices[0].Path);
}
}
else
{
AuthorizationStatus = false;
}
}
uiSyncContext.Post((s) =>
{
UpdateDevicesStatus();
}, null);
}
}
});
}