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);
}
public override byte[] CreateSignature(byte[] p_data)
{
if (o_hash_name == null || o_key == null)
{
throw new
CryptographicException("Qelesi dhe Hash algoritmi duhet te caktohen!");
}
else
{
HashAlgorithm x_hash_alg = HashAlgorithm.Create(o_hash_name);
byte[] x_pkcs = ElGamalSignatureFormatHelper.CreateEMSA_PKCS1_v1_5_ENCODE(p_data, x_hash_alg, o_key.KeyStruct.P.bitCount());
return(o_key.Sign(x_pkcs));
}
}
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
}
