// generate keys for ESD
private void textButtonGenerateKeys_Click(object sender, EventArgs e)
{
int p, q, m, d, n, x, y;
double g;
string hashAlgorithm = GetHashAlgorithm();
string RSA = "RSA";
string DSA = "DSA";
try
{
if (String.Compare(hashAlgorithm, RSA) == 0) // hash algorithm is RSA
{
p = Convert.ToInt32(textBoxP.Text);
q = Convert.ToInt32(textBoxQ.Text);
if (RSAProvider.IsTheNumberSimple(p) && RSAProvider.IsTheNumberSimple(q)) // P and Q is simple numbers?
{
textBoxD.Visible = true;
labelD.Visible = true;
textBoxN.Visible = true;
labelN.Visible = true;
m = (p - 1) * (q - 1);
n = RSAProvider.CalculateN(p, q);
d = RSAProvider.CalculateD(m);
textBoxD.Text = d.ToString();
textBoxN.Text = n.ToString();
}
else // P or Q is not simple numbers
{
MessageBox.Show("Numbers is 'p' or 'q' is not simple!", "Warning!");
textBoxP.Text = "";
textBoxQ.Text = "";
textBoxD.Text = "";
textBoxN.Text = "";
}
}
if (String.Compare(hashAlgorithm, DSA) == 0) // hash algorithm is DSA
{
q = Convert.ToInt32(textBoxQ.Text);
if (DSAProvider.IsTheNumberSimple(q)) // P is simple number?
{
textBoxP.Visible = true;
labelP.Visible = true;
textBoxD.Visible = true;
labelD.Visible = true;
textBoxN.Visible = true;
labelN.Visible = true;
hash = DSAProvider.GetSHA256Hash(textBoxTextTransmission.Text);
Random rand = new Random();
x = rand.Next(0, q);
p = DSAProvider.CalculateP(q);
g = DSAProvider.CalculateG(p, q);
y = DSAProvider.CalculateY(p, g, x);
string ESD = DSAProvider.Encode(hash, p, q, g, x);
bool result = DSAProvider.DecodeAndEqual(hash, p, q, y, g, ESD);
if (!result) // if keys gives wrong results
{
throw new Exception();
}
textBoxP.Text = p.ToString();
textBoxD.Text = y.ToString();
textBoxN.Text = x.ToString() + " " + g.ToString();
}
else // Q is not simple number
{
MessageBox.Show("Numbers is 'q' is not simple!", "Warning!");
textBoxP.Text = "";
textBoxQ.Text = "";
textBoxD.Text = "";
textBoxN.Text = "";
}
}
}
catch (Exception exception)
{
textButtonGenerateKeys.PerformClick(); // generate new ESD
Console.WriteLine(exception + "\n\n" + exception.Message);
}
}
// transfer of information to the server
private void textButtonTransmitInfo_Click(object sender, EventArgs e)
{
int p, q, d, m, e_, n, g, x, y;
string hashAlgorithm = "";
string RSA = "RSA";
string DSA = "DSA";
if (!CheckInputText())
{
textButtonTransmitInfo.Visible = false;
MessageBox.Show("Please enter text for transmission");
}
else // checking input text is true
{
try
{
if (client != null)
{
hashAlgorithm = GetHashAlgorithm();
if (String.Compare(hashAlgorithm, RSA) == 0) // hash algorithm is RSA
{
// hashing text
hash = RSAProvider.GetMd5Hash(textBoxTextTransmission.Text);
textBoxHashedText.Text = hash;
// variables for doing ESD
p = Convert.ToInt32(textBoxP.Text);
q = Convert.ToInt32(textBoxQ.Text);
d = Convert.ToInt32(textBoxD.Text);
n = Convert.ToInt32(textBoxN.Text);
m = (p - 1) * (q - 1);
e_ = RSAProvider.CalculateE(d, m);
ESD = RSAProvider.Encode(hash, e_, n);
// transfer of information to the server
client.TransmitInfo(hash, ESD, d, n, hashAlgorithm);
}
if (String.Compare(hashAlgorithm, DSA) == 0) // hash algorithm is DSA
{
// hashing text
hash = DSAProvider.GetSHA256Hash(textBoxTextTransmission.Text);
textBoxHashedText.Text = hash;
// variables for doing ESD
p = Convert.ToInt32(textBoxP.Text);
q = Convert.ToInt32(textBoxQ.Text);
y = Convert.ToInt32(textBoxD.Text);
string[] data = textBoxN.Text.Split(new Char[] { ' ' });
x = Convert.ToInt32(data[0]);
g = Convert.ToInt32(data[1]);
ESD = DSAProvider.Encode(hash, p, q, g, x);
// transfer of information to the server
client.TransmitInfo(hash, ESD, q, y, g, hashAlgorithm);
}
textButtonCheckInfo.Visible = true;
}
else
{
MessageBox.Show("Not connected to server");
}
}
catch (Exception exception)
{
MessageBox.Show(exception + "\n\n" + exception.Message);
}
}
}