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 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 button1_Click(object sender, EventArgs e)
{
/*
* 1. get client's pw
* 2. decrypt Encrpyted Message, using PW then display the KEY(TGS)
* 2. if the password is right then show ticket and Key TGS
* 3. but current procedure is not right. actually whether pw is right or not, the values should be same, and TGSerer will check it by decrypting
* 4. Create timestamp by system
*/
if (pwBox.Text.Length != 8)
{
MessageBox.Show("Password should be 8 characters");
}
else
{
f.printProcess("\n\nMessage decryption using Password in PW Text Box(Scenario 4,5)", ncolor);
decKey = secCol.decryption(p.getMessage(), tabCol, pwBox.Text, f); // decrypt encrypyed Key tgs using password
p.setMessage(secCol.getCharString(decKey));
decKeyBox.Text = p.getMessage(); // get char string format of decrypted message
string[] result = (p.getMessage()).Split(':'); //splitting message
string timestamp = null; // create timestamp
timestamp += (DateTime.Now.ToString("yyyyMMddHHmm"));
p.setTimeStamp(timestamp);
timeStamp.Text = p.getTimeStamp();
try
{
if (result[5] != null)
{
textBox2.Text = result[5];
p.setTGSKey(result[5]);//Client get TGS Key by decrypting message
}
}
catch
{
textBox2.Text = "";
timeStamp.Text = "";
MessageBox.Show("Failed to decrypt Message");
}
button2.Enabled = true;
mainPage.setFlag(4);
mainPage.setFlag(5);
}
}
