/// <summary>
/// Saves the file to the given path.
/// </summary>
private bool Save(string path)
{
PasswordDialog dialog = new PasswordDialog();
dialog.Owner = this;
dialog.NeedsVerifcation = true;
if (dialog.ShowDialog() == true)
{
string text = textEditor.Text;
byte[] textBytes = dialog.TextEncoding.GetBytes(text);
SecureString password = dialog.Password;
byte[] key = new byte[dialog.EncryptionConfig.KeySize / 8];
using (SecureStringBytes pwBytes = new SecureStringBytes(password, Encoding.UTF8))
{
password.Dispose();
dialog.EncryptionConfig.KeyAlgo.GenerateKey(pwBytes.Bytes, key);
}
try
{
SymmetricAlgorithm algo = dialog.EncryptionConfig.Algo.GetImplementation();
algo.KeySize = dialog.EncryptionConfig.KeySize;
algo.Key = key;
ICryptoTransform encryptor = algo.CreateEncryptor();
using (FileStream outStream = new FileStream(path, FileMode.Create))
{
outStream.Write(algo.IV, 0, algo.IV.Length);
using (CryptoStream cryptoStream = new CryptoStream(outStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(textBytes, 0, textBytes.Length);
}
}
FilePath = path;
fileChanged = false;
return(true);
}
catch (Exception e)
{
MessageBox.Show(this,
string.Format(Properties.Resources.DialogSaveErrorTitle, e.Message),
Properties.Resources.DialogSaveErrorTitle,
MessageBoxButton.OK, MessageBoxImage.Error);
}
finally
{
key.Fill <byte>(0, 0, key.Length);
}
}
return(false);
}
/// <summary>
/// Loads a file from the given path.
/// </summary>
private bool Load(string path)
{
PasswordDialog dialog = new PasswordDialog();
dialog.NeedsVerifcation = false;
// If we are opening a file on startup, the main window has not been visible yet, and
// thus is not a valid owner at this point.
if (IsVisible)
{
dialog.Owner = this;
}
if (dialog.ShowDialog() == true)
{
SecureString password = dialog.Password;
byte[] key = new byte[dialog.EncryptionConfig.KeySize / 8];
using (SecureStringBytes pwBytes = new SecureStringBytes(password, Encoding.UTF8))
{
password.Dispose();
dialog.EncryptionConfig.KeyAlgo.GenerateKey(pwBytes.Bytes, key);
}
string text;
try
{
SymmetricAlgorithm algo = dialog.EncryptionConfig.Algo.GetImplementation();
algo.KeySize = dialog.EncryptionConfig.KeySize;
algo.Key = key;
using (FileStream inStream = new FileStream(path, FileMode.Open))
{
byte[] iv = new byte[algo.IV.Length];
for (int i = 0; i < algo.IV.Length; i++)
{
iv[i] = (byte)inStream.ReadByte();
}
algo.IV = iv;
ICryptoTransform encryptor = algo.CreateDecryptor();
using (CryptoStream cryptoStream = new CryptoStream(inStream, encryptor, CryptoStreamMode.Read))
{
StreamReader reader = new StreamReader(cryptoStream, dialog.TextEncoding);
text = reader.ReadToEnd();
}
}
NewHistory(() => textEditor.Text = text);
FilePath = path;
return(true);
}
catch (CryptographicException e)
{
MessageBox.Show(this,
string.Format(Properties.Resources.DialogReadCryptoErrorText, e.Message),
Properties.Resources.DialogReadCryptoErrorTitle,
MessageBoxButton.OK, MessageBoxImage.Error);
}
catch (Exception e)
{
MessageBox.Show(this,
string.Format(Properties.Resources.DialogReadErrorTitle, e.Message),
Properties.Resources.DialogReadErrorTitle,
MessageBoxButton.OK, MessageBoxImage.Error);
}
finally
{
key.Fill <byte>(0, 0, key.Length);
}
}
return(false);
}
