private void buttonDec_Click(object sender, EventArgs e)
{
try
{
if (textBoxData.Text == String.Empty)
{
MessageBox.Show("Please enter data in text area");
return;
}
if (dec)
{
MessageBox.Show("Data has already decrypted");
return;
}
RC4 rc4 = new RC4(this.key);
rc4.Text = RC4.HexStrToStr(this.cipher);
textBoxData.Text = rc4.EnDeCrypt();
dec = true;
enc = false;
}
catch (Exception ex)
{
MessageBox.Show("Exception in Decryption : " + ex.Message + "------>" + ex.StackTrace);
}
}
private void buttonEnc_Click(object sender, EventArgs e)
{
try
{
if (textBoxData.Text == String.Empty)
{
MessageBox.Show("Please enter data in text area");
return;
}
if (enc)
{
MessageBox.Show("Data has already encrypted");
return;
}
if (!radioButton1.Checked && !radioButton2.Checked && !radioButton3.Checked && !radioButton4.Checked)
{
MessageBox.Show("Please enter type of encryption");
return;
}
if (radioButton1.Checked)
{
Random random = new Random();
int pos = random.Next(4);
this.key = keySet1[pos];
}
else if (radioButton2.Checked)
{
Random random = new Random();
int pos = random.Next(4);
this.key = keySet2[pos];
}
else if (radioButton3.Checked)
{
Random random = new Random();
int pos = random.Next(4);
this.key = keySet3[pos];
}
else if (radioButton4.Checked)
{
Random random = new Random();
int pos = random.Next(4);
this.key = keySet4[pos];
}
if (!enc)
{
RC4 rc4 = new RC4(this.key, textBoxData.Text);
this.cipher = RC4.StrToHexStr(rc4.EnDeCrypt());
MessageBox.Show("Cipher Text is " + this.cipher);
textBoxData.Text = cipher;
this.enc = true;
this.dec = false;
}
}
catch (Exception ex)
{
MessageBox.Show("Exception in Encryption : " + ex.Message + "----->" + ex.StackTrace);
}
}
