private static void DigitalSignatures()
{
var document = Encoding.UTF8.GetBytes("Document to Sign");
byte[] hashedDocument;
hashedDocument = HashData.ComputeHashSha256(document);
var digitalSignature = new DigitalSignature();
digitalSignature.AssignNewKey();
var signature = digitalSignature.SignData(hashedDocument);
var verified = digitalSignature.VerifySignature(hashedDocument, signature);
Console.WriteLine("Digital Signature Demonstration in .NET");
Console.WriteLine("---------------------------------------");
Console.WriteLine();
Console.WriteLine();
Console.WriteLine(" Original Text = " +
Encoding.Default.GetString(document));
Console.WriteLine();
Console.WriteLine(" Digital Signature = " +
Convert.ToBase64String(signature));
Console.WriteLine();
Console.WriteLine(verified
? "The digital signature has been correctly verified."
: "The digital signature has NOT been correctly verified.");
}
private void btnVerify_Click(object sender, EventArgs e)
{
var hashData = Convert.FromBase64String(txtResult.Text);
var signature = Convert.FromBase64String(txtSignature.Text);
if (rsa.VerifySignature(hashData, signature))
{
MessageBox.Show("Message is verified!");
}
else
{
MessageBox.Show("Message not correct!");
}
}