private bool blowFish()
{
bool ok = false;
Stream stream = openFileDialog1.OpenFile();
if (keyTextBox.Text.Length > 0)
{
if (keyTextBox.Text.Length >= 8)
{
byte[] key;
if (hexStringFlag.Checked)
key = Encryption.GetBytesFromHexString(keyTextBox.Text);
else
key = Encryption.GetBytes(keyTextBox.Text);
currentEncryption = new SHA256_Blowfish(key, stream);
ok = true;
}
else
MessageBox.Show("Blowfish needs atleast 8 bytes/characters as key");
}
else
{
hexStringFlag.Checked = true;
currentEncryption = new SHA256_Blowfish(stream);
ok = true;
}
this.preEncryption = normalPreEncryption;
this.duringEncryption = normalDuringEncryption;
this.postEncrtypion = normalPostEncryption;
return ok;
}
private void DecryptButton_Click(object sender, EventArgs e)
{
currentOperation = OPERATION_DECRYPTION;
switch (algorithmList.SelectedIndex)
{
case CAESARS_CIPHER:
{
Stream stream = openFileDialog1.OpenFile();
try
{
currentEncryption = new CaesarsCipherEncryption(stream, new Bitmap(100, 100));
((CaesarsCipherEncryption)currentEncryption).DestinationFolder = destinationFileList.Text;
EncryptionMeta output = new EncryptionMeta();
if (keyTextBox.Text.Length > 0)
{
output.Key = keyTextBox.Text;
output.Output = new Bitmap(stream);
stream.Close();
this.currentEncryption.Output = output;
EncryptAndDecryptFunction(false);
}
else
{
MessageBox.Show("Please input key.", "Error");
keyTextBox.Focus();
}
}
catch (FileNotFoundException)
{
MessageBox.Show("No file selected", "Error");
}
}
break;
case BLOWFISH:
{
Stream stream = openFileDialog1.OpenFile();
byte[] key;
if (hexStringFlag.Checked)
key = Encryption.GetBytesFromHexString(keyTextBox.Text);
else
key = Encryption.GetBytes(keyTextBox.Text);
currentEncryption = new SHA256_Blowfish(key, null);
((SHA256_Blowfish)currentEncryption).DestinationFolder = destinationFileList.Text;
EncryptionMeta output = new EncryptionMeta();
if (keyTextBox.Text.Length > 0)
{
output.Key = keyTextBox.Text;
output.Output = new Bitmap(stream);
Color color = output.Output.GetPixel(0, 0);
stream.Close();
currentEncryption.Output = output;
EncryptAndDecryptFunction(false);
}
}
break;
case OSIAS_ENCRYPTION:
{
if (keyTextBox.Text.Length > 0)
{
currentEncryption = new OSIASEncryption(null);
OSIASEncryption enc = (OSIASEncryption)currentEncryption;
enc.DataBitmap = new Bitmap(openFileDialog1.FileName);
enc.KeyBitMap = new Bitmap(openFileDialog2.FileName);
enc.Source = new FileStream(destinationFileList.Text + "\\output", FileMode.OpenOrCreate);
this.preEncryption = normalPreEncryption;
this.duringEncryption = normalDuringEncryption;
this.postEncrtypion = OsiasPostDecryption;
EncryptAndDecryptFunction(false);
}
}
break;
}
}
private bool osiasEncryption()
{
bool ok = false;
Stream stream = openFileDialog1.OpenFile();
this.currentEncryption = new OSIASEncryption(stream);
this.preEncryption = normalPreEncryption;
this.duringEncryption = normalDuringEncryption;
this.postEncrtypion = OsiasPostEncryption;
ok = true;
return ok;
}
private bool caesarscipher()
{
bool ok = false;
Stream stream = openFileDialog1.OpenFile();
this.currentEncryption = new CaesarsCipherEncryption(stream, new Bitmap(100, 100), keyTextBox.Text);
this.preEncryption = normalPreEncryption;
this.duringEncryption = normalDuringEncryption;
this.postEncrtypion = normalPostEncryption;
ok = true;
return ok;
}