public static string getSignature(string textToSign, string publicKey, string privateKey)
{
ECDsaSignature signer;
signer = ECDsaSignature.FromKeys(publicKey, privateKey);
byte[] byteStr = Encoding.Default.GetBytes(textToSign);
byte[] byteSignature = signer.SignData(byteStr);
return(Encoding.Default.GetString(byteSignature));
}
public static bool CheckSignature(Input inp)
{
List <string> stringList = inp.ScriptSign.Split(' ').ToList();
string signature = stringList[0];
string receiverPublicKey = stringList[1];
string stringToVerify = inp.PrevTransactionHash + " " + inp.OutputIndex.ToString();
ECDsaSignature verifier = ECDsaSignature.FromKeys(receiverPublicKey);
return(verifier.VerifyData(Encoding.Default.GetBytes(stringToVerify), Encoding.Default.GetBytes(signature)));
}
private void button_validate_Click(object sender, EventArgs e)
{
if (textBox_Verifier_PublicKey.Text == string.Empty || textBox_Verifier_Message.Text == string.Empty || textBox_verifier_signature.Text == string.Empty)
{
MessageBox.Show("Please check input parameters");
return;
}
///DATA SIGNATURE VERIFICATION-SERVER SIDE Parameters needed: Public Key, The Signature, The Message
string publicKey = textBox_Verifier_PublicKey.Text;
string message = textBox_Verifier_Message.Text;
byte[] byteMessage = Encoding.Default.GetBytes(message);
byte[] byteSignature = signature;
ECDsaSignature verifier = ECDsaSignature.FromKeys(publicKey); //creating a verifier object
bool result = verifier.VerifyData(byteMessage, byteSignature); //result if the signature was created by true public key
MessageBox.Show(result?"the signature is valid":"signature is invalid");
}
private void button_sign_Click(object sender, EventArgs e)
{
if (textBox_prover_message.Text == string.Empty || textBox_prover_privateKey.Text == string.Empty || textBox_prover_message.Text == string.Empty)
{
MessageBox.Show("Please check input parameters");
return;
}
///DATA SIGNING OPERATION-CLIENT SIDE Parameters needed: Private Key, Public Key, the Message(to sign)
string message = textBox_prover_message.Text; //string(message object) to sign
string privateKey = textBox_prover_privateKey.Text; //private key generated by KeyGen
string publicKey = textBox_prover_PublicKey.Text; //public key generated by KeyGen
signer = ECDsaSignature.FromKeys(publicKey, privateKey); //creating signer object with public and private key parameters
byte[] byteMessage = Encoding.Default.GetBytes(message); //converting the message object to byteArray to enable signing operation
byte[] byteSignature = signer.SignData(byteMessage); //signing operation with signer object
signature = signer.SignData(byteMessage);
string signatureStr = Encoding.Default.GetString(byteSignature); //converting signature from byteArray to string
textBox_prover_signature.Text = signatureStr;
textBox_verifier_signature.Text = signatureStr;
}