private void EncryptButton_Click(object sender, RoutedEventArgs e)
{
if (MessageTextBlock.Text != "" || UserComboBox.SelectedIndex == -1)
{
try
{
using (var myAes = Aes.Create())
{
myAes.KeySize = 128;
var originalMessage = MessageTextBlock.Text;
var toUser = _userBus.getUserByUserName(UserComboBox.SelectedItem.ToString());
Message msg = new Message();
msg.To = toUser;
msg.From = currUser;
//FILE 1 - Encrypt message symetric
var file1 = AESCrypto.EncryptStringToBytes(originalMessage, myAes.Key, myAes.IV);
msg.File1 = file1;
msg.IV = myAes.IV;
MessageTextBlock.Text += "\n\n########File 1 - Symmetric encryption########\n\n";
for (var i = 0; i < file1.Length; i++)
{
MessageTextBlock.Text += file1[i].ToString();
}
//FILE 2 - Encrypt symetric key with PuK from toUser
var file2 = RSACrypto.EncryptBytes(myAes.Key, toUser.PuK);
msg.File2 = file2;
MessageTextBlock.Text += "\n\n########File 2 - RSA encryption: AES key with public key ToUser ########\n\n";
for (var i = 0; i < file2.Length; i++)
{
MessageTextBlock.Text += file2[i].ToString();
}
//FILE 3 - HASH Original message and encrypt with private from currUser
var hash = BCrypt.HashPassword(originalMessage, BCrypt.GenerateSalt());
byte[] bytes = new byte[hash.Length * sizeof(char)];
System.Buffer.BlockCopy(hash.ToCharArray(), 0, bytes, 0, bytes.Length);
var file3 = RSACrypto.EncryptBytes(Encoding.UTF8.GetBytes(hash), toUser.PuK);
msg.File3 = file3;
MessageTextBlock.Text += "\n\n########File 3 - RSA encryption: Hash message and encrypt with private key FromUser ########\n\n";
for (var i = 0; i < file3.Length; i++)
{
MessageTextBlock.Text += file3[i].ToString();
}
if (_msgBus.Create(msg))
{
MessageBox.Show("Message created");
}
else
{
MessageBox.Show("Message not saved");
}
UnicodeEncoding _encoder = new UnicodeEncoding();
MessageTextBlock.Text += "\n\n######## AES KEY ########\n\n";
MessageTextBlock.Text += _encoder.GetString(myAes.Key);
MessageTextBlock.Text += "\n\n######## BCRYPT HASH ########\n\n";
MessageTextBlock.Text += Encoding.UTF8.GetString(bytes);
// MessageTextBlock.Text += hash;
}
}catch (Exception ex)
{
MessageBox.Show(ex.Message);
MessageBox.Show("Er ging iets mis!", "Fout!", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
else
{
MessageBox.Show("U have to take someone to send it to, and you have to fill in a message!",
"Warning!",
MessageBoxButton.OK, MessageBoxImage.Warning);
}
}