private void button3_Click(object sender, EventArgs e)
{
//verification Timestamp
/* 1. get time stamp
* 2. get first 9char
* 3. it the first chun is timestamp then it is timestamp pakcet if not return it is invalid
* 4. get next chunks y,m,h,m 4 chnuks
* 5. if the time has difference then 2 minuts, the message is invalid*/
f.printProcess("\n\nDecrypt Message using Key TGS (Scenario 8)", ncolor);
f.printProcess("If the time stamp is sent in five minute, then it is valid (Scenario 9)", ncolor);
decMessage = secCol.decryption(p.getEncMessage(), tabCol, tgServer.geTGSkey(), f);
decMessage = secCol.getCharString(decMessage);
textBox9.Text = decMessage;
string[] result = ((decMessage).Split(':'));//splitting message
if (result.Length == 10) // check the message whether it has correct timestamp format
{
string ticket = "";
for (int i = 0; i < result.Length - 2; i++)
{
if (i == result.Length - 3)
{
ticket += result[i];
}
else
{
ticket += result[i] + ":";
}
}
string timestamp = result[result.Length - 1];
textBox13.Text = ticket;
string curTime = DateTime.Now.ToString("yyyyMMddHHmm");
long flag = Convert.ToInt64(curTime) - Convert.ToInt64(timestamp);
//if the time is send in five minutes
if (flag < 5)
{
button4.Enabled = true;
textBox8.Text = timestamp;
textBox3.Text = "valid";
}
else
{
textBox8.Text = timestamp;
textBox3.Text = "invalid";
}
}
else
{
textBox3.Text = "invalid";
}
button3.Enabled = false;
mainPage.setFlag(8);
mainPage.setFlag(9);
}
private void button6_Click(object sender, EventArgs e)
{
/* decrypt the key using TGS key and get CS key
*/
f.printProcess("\n\nDecrypt Key CS using Key TGS (Scenario 13)", ncolor);
textBox5.Text = secCol.getCharString(secCol.decryption(p.getCSKey(), tabCol, p.getTGSKey(), f));
p.setCSKey(secCol.getCharString(secCol.decryption(p.getCSKey(), tabCol, p.getTGSKey(), f)));
button7.Enabled = true;
button6.Enabled = false;
mainPage.setFlag(13);
}
private void button5_Click(object sender, EventArgs e)
{
/*
* this button send Client ID to Authentication Server and request Key TGS and ticket
* Key encrypted with Password
* if the ID is in the A.S then It gets ticket and encrypted key from them.
*/
if (idBox.Text == "")
{
MessageBox.Show("Invalid Username");
}
else
{
ncolor = Color.Black;
f.printProcess("Message encryption using Password in Authentication Server (Scenario 1,2)", ncolor);
/* 1. Create Key TGS
* 2. Create Ticket which has client id, create time and Key tgs.
* 4. Create message with Ticket and Key TGS
* 3. Encrypt the Message with client's password
* 4. send the encrypted Message to Client.
* */
string ticket = "ID:" + idBox.Text + ":time:" + (DateTime.Now.ToString("yyyyMMddHHmm")); //Create ticket
textBox1.Text = aServer.getTGSkey();
ticketBox.Text = ticket;
textBox3.Text = ticket + ":key:" + aServer.getTGSkey();
encKey = secCol.encryption(secCol.getBit(ticket + ":key:" + aServer.getTGSkey()), tabCol, aServer.getPassword(idBox.Text), f); // Encrypt the ticket using Password.
encKeyBox.Text = encKey;
button3.Enabled = true;
mainPage.setFlag(1);
mainPage.setFlag(2);
f.setFlag(1);
}
}
