public static string ExportPrivateKeyPEM(this X509Certificate2 cert,
                                                 bool includeB64LineBreaks = true,
                                                 string headerFooter       = defaultPrivKeyHeader)
        {
            RSACryptoServiceProvider privKeyPrvdr = (RSACryptoServiceProvider)cert.PrivateKey;

            return(privKeyPrvdr.ExportPrivateKeyPEM(includeB64LineBreaks, headerFooter));
        }