mockpit

public class RsaToDerConverter
    {
        public static String ExportPrivateKey(RSACryptoServiceProvider csp)
        {
            TextWriter outputStream = new StringWriter();
            if (csp.PublicOnly) throw new ArgumentException("CSP does not contain a private key", "csp");
            var parameters = csp.ExportParameters(true);
            using (var stream = new MemoryStream())
            {
                var writer = new BinaryWriter(stream);