public class Crypt
{
  public static string OpenSslSign(string privateKeyFile, string content)
  {
    var pkey = new PrivateKey();
    pkey.LoadPemFile(privateKeyFile);
    string pkeyXml = pkey.GetXml();
    var rsa = new Rsa();
    bool success = rsa.UnlockComponent("30-day trial");
    if (success != true) {