private void CheckButton_Click(object sender, EventArgs e)
{
long e_ = Int64.Parse(E_maskedTextBox6.Text);
long n = Int64.Parse(N_maskedTextBox5.Text);
long hash = Message_richTextBox4.Text.GetHashCode() % n;
long InputHash = RSAProvider.Decrypt(Int64.Parse(Hash_richTextBox3.Text), e_, n);
if (hash == InputHash)
{
MessageBox.Show("Digital signature is correct");
}
else
{
MessageBox.Show("Digital signature is incorrect");
}
}
private void EncryptButton_Click(object sender, EventArgs e)
{
int p = Int32.Parse(P_maskedTextBox1.Text);
int q = Int32.Parse(Q_maskedTextBox2.Text);
if (!(MathHelp.IsPrime(p) && MathHelp.IsPrime(q)))
{
MessageBox.Show("Numbers are not simple");
return;
}
RSAProvider RSA = null;
try
{
RSA = new RSAProvider(p, q);
}
catch (System.OverflowException)
{
MessageBox.Show("numbers are too big");
return;
}
long n = RSA.PublicKeyN;
long e_ = RSA.PublicKeyE;
long d = RSA.PrivateKey;
long hash = Message_richTextBox.Text.GetHashCode() % n;
Hash_richTextBox.Text = RSAProvider.Encrypt(hash, d, n).ToString();
Hash_richTextBox3.Text = Hash_richTextBox.Text;
Message_richTextBox4.Text = Message_richTextBox.Text;
E_maskedTextBox3.Text = e_.ToString();
N_maskedTextBox4.Text = n.ToString();
E_maskedTextBox6.Text = e_.ToString();
N_maskedTextBox5.Text = n.ToString();
}