private void button_Encoder_Click(object sender, EventArgs e)
{
// Field fill check
if (textBox_OriginalMessage.Text.Length <= 0 || textBox_OriginalSymmetricKey.Text.Length <= 0 ||
textBox_P.Text.Length <= 0 || textBox_Q.Text.Length <= 0)
{
MessageBox.Show("Fields are not filled");
return;
}
string message = textBox_OriginalMessage.Text; // Message A
string codedMessage; // Encrypted message A
string symKey = textBox_OriginalSymmetricKey.Text; // Session key
List <string> codedSymKey; // Encrypted session key
// A: create session key
byte[] keyByte = ASCIIEncoding.ASCII.GetBytes(symKey);
RC4 symEncode = new RC4(keyByte);
// A: Encoding message A using a symmetric algorithm
byte[] messageBytes = ASCIIEncoding.ASCII.GetBytes(message);
byte[] codedMessageByte = symEncode.Encode(messageBytes, messageBytes.Length);
codedMessage = Convert.ToBase64String(codedMessageByte);
label_CodedMessage.Text = codedMessage;
// B: Generate and display RSA public key
Int64 p = Convert.ToInt64(textBox_P.Text);
Int64 q = Convert.ToInt64(textBox_Q.Text);
if (!asymEncoderDecoder.GeneratePublicAndPrivateKey(p, q))
{
//MessageBox.Show("Symmetric key is not encoded");
return;
}
Int64 N = asymEncoderDecoder.GetN();
label_N_public.Text = Convert.ToString("N: " + N);
Int64 E = asymEncoderDecoder.GetE();
label_E.Text = Convert.ToString("E: " + E);
// A: Encrypt symmetric key with RSA public key
codedSymKey = asymEncoderDecoder.Encrypt(symKey);
label_CodedSymmetricalKey.ResetText();
foreach (string item in codedSymKey)
{
label_CodedSymmetricalKey.Text += item + " ";
}
button_Decoder.Enabled = true;
}
public byte[] Decode(byte[] allbuf, int len)
{
byte[] buf = new byte[len];
Array.Copy(allbuf, buf, len);
if (dec == null)
{
return(buf);
}
byte[] ret = new byte[buf.Length];
for (int i = 0; i < ret.Length; i++)
{
ret[i] = dec.Encode(buf[i]);
}
return(ret);
}
public byte[] Encode(byte[] allbuf)
{
if (enc == null)
{
return(allbuf);
}
byte[] buf = allbuf;
buf = mppc.Pack(buf);
for (int i = 0; i < buf.Length; i++)
{
buf[i] = enc.Encode(buf[i]);
}
return(buf);
}