/// <summary>
/// Decrypts wav data using private key set in RsaManager static class. Returns true if successful.
/// </summary>
/// <returns>True if successful otherwise false</returns>
public bool Decrypt()
{
if (Status == WavFileState.Decrypted || Status == WavFileState.Empty)
{
return(false);
}
using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
{
//Gets encrypted array containing key and IV for aes algorithm from the end of data array
var encryptedKeyAndIV = data.Skip(data.Length - RsaManager.EncryptedDataLength).ToArray();
var mergedKeyAndIV = RsaManager.Decrypt(encryptedKeyAndIV);
if (mergedKeyAndIV == null)
{
return(false);
}
//Split merged array to both variables
aes.Key = mergedKeyAndIV.Take(32).ToArray();
aes.IV = mergedKeyAndIV.Skip(32).ToArray();
var decryptor = aes.CreateDecryptor();
//Get only data without merged key and IV array from the end
data = data.Take(data.Length - RsaManager.EncryptedDataLength).ToArray();
//Decrypt data
data = decryptor.TransformFinalBlock(data, 0, data.Length);
}
Status = WavFileState.Decrypted;
return(true);
}
/// <summary>
/// Encrypts wav data using public key set in RsaManager static class. Returns true if successful.
/// </summary>
/// <returns>True if successful otherwise false</returns>
public bool Encrypt()
{
if (Status == WavFileState.Encrypted || Status == WavFileState.Empty)
{
return(false);
}
using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
{
var encryptor = aes.CreateEncryptor();
//Encrypt data
Data = encryptor.TransformFinalBlock(Data, 0, Data.Length);
//Save both AES key parts to one array
byte[] mergedKeyAndIV = new byte[aes.Key.Length + aes.IV.Length];
Array.Copy(aes.Key, mergedKeyAndIV, aes.Key.Length);
Array.Copy(aes.IV, 0, mergedKeyAndIV, aes.Key.Length, aes.IV.Length);
var encryptedKeyAndIV = RsaManager.Encrypt(mergedKeyAndIV);
if (encryptedKeyAndIV == null)
{
return(false);
}
//Add encrypted AES key and IV array to the end of data array
var oldLength = data.Length;
Array.Resize(ref data, oldLength + encryptedKeyAndIV.Length);
Array.Copy(encryptedKeyAndIV, 0, data, oldLength, encryptedKeyAndIV.Length);
}
Status = WavFileState.Encrypted;
return(true);
}
private void SaveBothKeysButton_Click(object sender, RoutedEventArgs e)
{
var privateKeyName = UniqueKeyFileNamePart + "-private_key-" + CommonKeyFileNamePart;
var publicKeyName = UniqueKeyFileNamePart + "-public_key-" + CommonKeyFileNamePart;
RsaManager.WriteKeysToFile(privateKeyName, publicKeyName);
string message = "Klucze zostały zapisane pod nazwami:\n\n" + privateKeyName + "\n" + publicKeyName;
MessageBox.Show(message, "Zapisano", MessageBoxButton.OK, MessageBoxImage.Information);
}
private void PublicKeySaveAsButton_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog SaveAsDialog = new SaveFileDialog();
SaveAsDialog.Title = "Zapisz klucz publiczny jako";
SaveAsDialog.Filter = "Plik tekstowy|*.txt";
if (SaveAsDialog.ShowDialog() == true)
{
RsaManager.WriteKeysToFile(false, SaveAsDialog.FileName);
}
}
private void LoadPublicKeyButton_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog OpenDialog = new OpenFileDialog();
OpenDialog.Title = "Wybierz plik zawierający klucz publiczny";
if (OpenDialog.ShowDialog() == true)
{
string publicKey = File.ReadAllText(OpenDialog.FileName, Encoding.UTF8);
RsaManager.SetKey(false, publicKey);
PublicKeyTextBlock.Text = RsaManager.GetKeyString(false);
}
}
private void GenerateKeyParButton_Click(object sender, RoutedEventArgs e)
{
PrivateKeyLoadingImage.Visibility = Visibility.Visible;
PublicKeyLoadingImage.Visibility = Visibility.Visible;
PrivateKeyTextBlock.Text = "";
PublicKeyTextBlock.Text = "";
Task.Run(() =>
{
RsaManager.GenerateKeyPar();
this.Dispatcher.Invoke(() =>
{
PrivateKeyLoadingImage.Visibility = Visibility.Collapsed;
PublicKeyLoadingImage.Visibility = Visibility.Collapsed;
PrivateKeyTextBlock.Text = RsaManager.GetKeyString(true);
PublicKeyTextBlock.Text = RsaManager.GetKeyString(false);
});
});
//Task task = Task.Run((Action)RsaManager.generateKeyPar);
//task.ContinueWith((t) =>
//{
// PrivateKeyTextBlock.Text = RsaManager.GetKeyString(true);
// PublicKeyTextBlock.Text = RsaManager.GetKeyString(false);
//});
}