//enkripsi
private void button2_Click(object sender, EventArgs e)
{
//menyimpan hasil paling akhir
String result;
//menyimpan hasil tiap mode
byte[] modeResult = null;
String mode = "";
//check input file
if (openFileDialog1.FileName.Equals("openFileDialog1"))
{
MessageBox.Show("Anda belum memasukan input file", "Peringatan", MessageBoxButtons.OK);
return;
}
//validate key and IV
Regex reg = new Regex("^[a-zA-Z0-9]*$");
//key.length >= 8-byte
if (keyBox.Text.Length < 8)
{
MessageBox.Show("Panjang kunci kurang dari 64-bit", "Peringatan", MessageBoxButtons.OK);
return;
}
else if(!reg.IsMatch(keyBox.Text))
{
MessageBox.Show("Kunci hanya boleh mengandung karakter alfanumerik", "Peringatan", MessageBoxButtons.OK);
return;
}
else
{
//IV.length = key.length
if ((!radioButton2.Checked && !radioButton1.Checked) && (ivBox.Text.Length != keyBox.Text.Length))
{
MessageBox.Show("Panjang IV tidak sama dengan panjang kunci", "Peringatan", MessageBoxButtons.OK);
return;
}
else if ((!radioButton2.Checked && !radioButton1.Checked) && (ivBox.Text.Contains(".")))
{
MessageBox.Show("IV tidak boleh mengandung karakter \".\"", "Peringatan", MessageBoxButtons.OK);
return;
}
}
//read file content (plaintext)
String dialogfilename = openFileDialog1.FileName;
byte[] plain = System.IO.File.ReadAllBytes(dialogfilename);
//check used mode
if (radioButton1.Checked)
{
//ECB mode
mode = "ECB";
ECB ecb = new ECB (plain, null, keyBox.Text, ivBox.Text);
modeResult = ecb.encrypt();
}
else if (radioButton2.Checked)
{
//generate IV
//IV==key
//CBC mode
mode = "CBC";
CBC cbc = new CBC(Encoding.ASCII.GetString(plain), "", keyBox.Text, keyBox.Text);
ivBox.Text = keyBox.Text;
modeResult = cbc.encipher(plain);
}
else if (radioButton3.Checked)
{
//CFB mode
mode = "CFB";
CFB cfb = new CFB(plain, null ,keyBox.Text,ivBox.Text);
modeResult = cfb.encrypt();
}
else if (radioButton4.Checked)
{
//OFB mode
mode = "OFB";
OFB ofb = new OFB(plain, null, keyBox.Text, ivBox.Text);
modeResult = ofb.encrypt();
}
//convert byte to hex
result = ByteArrayToString(modeResult);
//set header
result += "." + ivBox.Text + "." + Path.GetFileNameWithoutExtension(filepath) + Path.GetExtension(filepath) + "." + mode + "." + (keyBox.Text.Length- (plain.Length % keyBox.Text.Length)).ToString();
textBox3.Text = result;
}
//dekripsi
private void button3_Click(object sender, EventArgs e)
{
//header variable
String iv;
int padding;
byte[] content = new byte[1];
String mode = "";
//instead of keyBox.Text use this
String newKey = keyBox.Text;
//result for each mode
byte[] modeResult = new byte[keyBox.Text.Length];
//validate input file
if (openFileDialog1.FileName.Equals("openFileDialog1"))
{
MessageBox.Show("Anda belum memasukan input file", "Peringatan", MessageBoxButtons.OK);
return;
}
//validasi kunci
//key.length >= 8-byte
if (keyBox.Text.Length < 8)
{
MessageBox.Show("Panjang kunci kurang dari 64-bit", "Peringatan", MessageBoxButtons.OK);
return;
}
//read file content (cipher)
String dialogfilename = openFileDialog1.FileName;
String cipher = System.IO.File.ReadAllText(dialogfilename);
//no need for iv
//get header
String[] header = cipher.Split('.');
if (header.Length != 6)
{
MessageBox.Show("Bukan file yang dapat didekripsi", "Peringatan", MessageBoxButtons.OK);
return;
}
else
{
filepath = header[2];
iv = header[1];
mode = header[4];
padding = Int32.Parse(header[5]);
content = StringToByteArray(header[0]);
extension = header[3];
//validate key
if (content.Length % keyBox.Text.Length != 0 && !mode.Equals("CBC"))
{
newKey = "";
Random rnd = new Random(content.Length);
for (int i = 0; i < (content.Length); i++)
{
newKey += rnd.Next() % 255;
}
}
if (mode.Equals("ECB"))
{
//ECB mode
ECB ecb = new ECB(null, content, newKey, iv);
byte[] pbytes = ecb.decrypt();
Console.WriteLine("hasil dekripsi: {0}", ByteArrayToString(pbytes));
textBox3.Text = ByteArrayToString(pbytes);
if (extension.Equals("txt"))
{
//show plaintext if using text extension
textBox3.Text += Environment.NewLine + Environment.NewLine + Encoding.ASCII.GetString(pbytes);
Console.WriteLine("textbox3 {0}", textBox3.Text);
}
else
{
//savefile
String path = System.IO.Directory.GetCurrentDirectory();
System.IO.File.WriteAllBytes(System.IO.Directory.GetCurrentDirectory() + "/" + filepath + "." + extension, pbytes);
}
}
else
if (mode.Equals("CBC"))
{
//Generate IV
//CBC mode
CBC cbc = new CBC("", Encoding.ASCII.GetString(content), newKey, iv);
byte[] pbytes = cbc.decipher(content);
Console.WriteLine("hasil dekripsi: {0}", ByteArrayToString(pbytes));
textBox3.Text = ByteArrayToString(pbytes);
if (extension.Equals("txt"))
{
//show plaintext if using text extension
textBox3.Text += Environment.NewLine + Environment.NewLine + Encoding.ASCII.GetString(pbytes);
Console.WriteLine("textbox3 {0}", textBox3.Text);
}
else
{
//savefile
String path = System.IO.Directory.GetCurrentDirectory();
System.IO.File.WriteAllBytes(System.IO.Directory.GetCurrentDirectory() + "/" + filepath + "." + extension, pbytes);
}
}
else
if (mode.Equals("CFB"))
{
//CFB mode
CFB cfb = new CFB(null, content, keyBox.Text, iv);
byte[] pbytes = cfb.decrypt();
Console.WriteLine("hasil dekripsi: {0}", ByteArrayToString(pbytes));
textBox3.Text = ByteArrayToString(pbytes);
if (extension.Equals("txt"))
{
//show plaintext if using text extension
textBox3.Text += Environment.NewLine + Environment.NewLine + Encoding.ASCII.GetString(pbytes);
Console.WriteLine("textbox3 {0}",textBox3.Text);
}
else
{
//savefile
String path = System.IO.Directory.GetCurrentDirectory();
System.IO.File.WriteAllBytes(System.IO.Directory.GetCurrentDirectory() + "/" + filepath + "." + extension,pbytes);
}
}
else
if (mode.Equals("OFB"))
{
//OFB mode
OFB ofb = new OFB(null, content, keyBox.Text, iv);
Console.WriteLine(iv);
byte[] pbytes = ofb.decrypt();
Console.WriteLine("hasil dekripsi: {0}", ByteArrayToString(pbytes));
textBox3.Text = ByteArrayToString(pbytes);
if (extension.Equals("txt"))
{
//show plaintext if using text extension
textBox3.Text += Environment.NewLine + Environment.NewLine + Encoding.ASCII.GetString(pbytes);
Console.WriteLine("textbox3 {0}", textBox3.Text);
}
else
{
//savefile
String path = System.IO.Directory.GetCurrentDirectory();
System.IO.File.WriteAllBytes(System.IO.Directory.GetCurrentDirectory() + "/" + filepath + "." + extension, pbytes);
}
}
}
}
