public static bool VerifySignature(string signatureFilePath, int keySize, string publicKeyFilePath)
{
var signatureText = FileOperations.ReadFromTextFile(signatureFilePath);
var signatureTextSplit = signatureText.Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
var signature = Converter.HexStringToBytes(signatureTextSplit[1]);
var message = Converter.HexStringToBytes(signatureTextSplit[3]);
return(RSA.VerifyData(message, keySize, publicKeyFilePath, new SHA1CryptoServiceProvider(), signature));
}
public static void CreateEnvelopeSignature(string envelopeTextFilePath, int keySize, string privateKeyFilePath,
string outputFilePath)
{
var message = FileOperations.ReadFromTextFile(envelopeTextFilePath);
var messageBytes = FileOperations.ReadFromBinaryFile(envelopeTextFilePath);
var signature = RSA.SignData(messageBytes, keySize, privateKeyFilePath, new SHA1CryptoServiceProvider());
var hashText = Converter.ByteArrayToString(signature);
var digitalSignature = "Signature:" + Environment.NewLine + hashText + Environment.NewLine +
Environment.NewLine + "Message:" + Environment.NewLine + message;
FileOperations.WriteToTextFile(outputFilePath, digitalSignature);
}