private void VerifySignatureButton_Click(object sender, EventArgs e)
{
if (!IsValidSignature())
{
ResultRichTextBox.Text = "Syntax error in Signature";
return;
}
if (!IsValidPublicKey())
{
ResultRichTextBox.Text = "Syntax error in Public Key";
return;
}
try
{
DigitalSignature.DigitalSignature signature = GetDigitalSignatureAlgo();
byte[] publicKey = StringToByte(PublicKeyTextBox.Text, 64);
byte[] sig = StringToByte(DigitalSignatureTextBox.Text, 64);
byte[] hash = new HashFunction(new GOST34112018Policy256bit()).GetHash(Encoding.Default.GetBytes(MessageTextBox.Text));
if (signature.IsSignatureValid(hash, sig, publicKey))
{
ResultRichTextBox.Text = "Signature is valid";
}
else
{
ResultRichTextBox.Text = "Signature is invalid";
}
}
catch (Exception exp)
{
ResultRichTextBox.Text = "Error occured while signature had been checking. " + exp.Message;
}
}
private void CalculateSignatureButton_Click(object sender, EventArgs e)
{
if (!IsValidPrivateKey())
{
ResultRichTextBox.Text = "Syntax error in Private Key";
return;
}
try
{
DigitalSignature.DigitalSignature signature = GetDigitalSignatureAlgo();
byte[] privateKey = StringToByte(PrivateKeyTextBox.Text, 32);
byte[] hash = new HashFunction(new GOST34112018Policy256bit()).GetHash(Encoding.Default.GetBytes(MessageTextBox.Text));
DigitalSignatureTextBox.Text = string.Join("", BitConverter.ToString(signature.CreateSignature(hash, privateKey)).Split('-'));
ResultRichTextBox.Text = "Success";
}
catch (Exception exp)
{
ResultRichTextBox.Text = "Error occured while signature had been calculating. " + exp.Message;
}
}
