private bool Examination(int P, int Q, int E, int D)
{
if (P == Q)
{
MessageBox.Show("Error: P = Q");
return(false);
}
else if (P <= 1)
{
MessageBox.Show("Error: p <= 1");
return(false);
}
else if (Q <= 1)
{
MessageBox.Show("Error: q <= 1");
return(false);
}
else if (P * Q <= 256)
{
MessageBox.Show("Error: n is too small");
return(false);
}
else if (E <= 1)
{
MessageBox.Show("Error: e <= 1");
return(false);
}
else if (D <= 1)
{
MessageBox.Show("Error: d <= 1");
return(false);
}
else if (!ModulMath.IsSimple(P))
{
MessageBox.Show("Error: P is not simple");
return(false);
}
else if (!ModulMath.IsSimple(Q))
{
MessageBox.Show("Error: Q is not simple");
return(false);
}
else if (ModulMath.Euclid(E, (P - 1) * (Q - 1)) != 1)
{
MessageBox.Show("Error: E and w(n) are not coprime");
return(false);
}
else if (ModulMath.Euclid(D, (P - 1) * (Q - 1)) != 1)
{
MessageBox.Show("Error: D and w(n) are not coprime");
return(false);
}
return(true);
}
public static string Encipher(string PlainText, Key key)
{
char[] PlainTextChars = PlainText.ToCharArray();
for (int i = 0; i < PlainTextChars.Length; i++)
{
PlainTextChars[i] = (char)ModulMath.FastExp((Int32)PlainTextChars[i], key.x, key.n);
}
string CipherText = new string(PlainTextChars);
return(CipherText);
}
private void Generate_Click(object sender, EventArgs e)
{
int E = Int32.Parse(eField.Text);
int P = Int32.Parse(pField.Text);
int Q = Int32.Parse(qField.Text);
int D = ModulMath.EuclidEx(E, (P - 1) * (Q - 1)).x;
if (!this.Examination(P, Q, E, D))
{
return;
}
this.dField.Text = D.ToString();
this.nField.Text = (P * Q).ToString();
this.w_nField.Text = ((P - 1) * (Q - 1)).ToString();
}
public Form1()
{
InitializeComponent();
this.pField.Text = 53.ToString();
this.qField.Text = 61.ToString();
this.eField.Text = 71.ToString();
int E = Int32.Parse(eField.Text);
int P = Int32.Parse(pField.Text);
int Q = Int32.Parse(qField.Text);
int D = ModulMath.EuclidEx(E, (P - 1) * (Q - 1)).x;
if (!this.Examination(P, Q, E, D))
{
return;
}
this.dField.Text = D.ToString();
this.nField.Text = (P * Q).ToString();
this.w_nField.Text = ((P - 1) * (Q - 1)).ToString();
}
public static int Encipher(int number, Key key)
{
return((char)ModulMath.FastExp(number, key.x, key.n));
}