private void btnSign_Click(object sender, EventArgs e)
{
string fileHash = ECDSAOperations.GetSha256FileHash(txtFileURL.Text);
if (fileHash.Length > 0)
{
txtHash.Text = fileHash;
string signature = ECDSAOperations.SignMessage(txtPrivateKey.Text, fileHash);
txtMAC.Text = signature;
}
}
