private void btnSign_Click(object sender, EventArgs e)
{
x_plaintextForSignature = Encoding.UTF8.GetBytes(txtSignPlaintext.Text);
x_alg_signature.KeySize = int.Parse(cboKeySizes.SelectedValue.ToString());
x_xml_string_signature = x_alg_signature.ToXmlString(true);
ElGamal x_sign_alg = new ElGamalManaged();
x_sign_alg.FromXmlString(x_alg_signature.ToXmlString(true));
x_signature = x_sign_alg.Sign(x_plaintextForSignature);
txtSignedPlainText.Text = Convert.ToBase64String(x_signature);
}
private void btnSign_Click(object sender, EventArgs e)
{
x_plaintextForSignature = Encoding.UTF8.GetBytes(txtSignPlaintext.Text);
// Create an instance of the algorithm and generate some keys
// set the key size - keep is small to speed up the tests
x_alg_signature.KeySize = int.Parse(cboKeySizes.SelectedValue.ToString());
// extract and print the xml string (this will cause
// a new key pair to be generated)
string x_xml_string = x_alg_signature.ToXmlString(true);
ElGamal x_sign_alg = new ElGamalManaged();
// set the keys - note that we export with the
// private parameters since we are signing data
x_sign_alg.FromXmlString(x_alg_signature.ToXmlString(true));
x_signature = x_sign_alg.Sign(x_plaintextForSignature);
txtSignedPlainText.Text = Encoding.UTF8.GetString(x_signature);
// verify the signature
}
private void btnVerify_Click(object sender, EventArgs e)
{
x_plaintextForSignature = Encoding.UTF8.GetBytes(txtSignPlaintext.Text);
ElGamal x_verify_alg = new ElGamalManaged();
x_verify_alg.FromXmlString(x_alg_signature.ToXmlString(false));
bool IsValid = x_verify_alg.VerifySignature(x_plaintextForSignature, x_signature);
if (IsValid)
{
pbIsValid.Visible = true;
pbIsValid.Image = Resources.Valid;
}
else
{
pbIsValid.Visible = true;
pbIsValid.Image = Resources.InValid;
}
}
