smime con mono.

Buenas tardes a todos, estoy intentando calcular la firma de un mensaje
con el siguiente codigo:

public static byte[] Sign
    (String pkcs12Path, 
    string password, 
    string message)
    {
	X509Certificate2 cert;
	if (password == null)
	    cert= new X509Certificate2 (pkcs12Path);
	else
	    cert= new X509Certificate2  (pkcs12Path, password);
	ContentInfo content = new ContentInfo
(System.Text.Encoding.Default.GetBytes (message));
	SignedCms signedCms = new SignedCms (content, false);
	CmsSigner signer = new 	CmsSigner (cert);
	signedCms.ComputeSignature (signer);
	return signedCms.Encode ();
}

cuando utilizo este metodo obtengo la siguiente excepcion:

Unhandled Exception:
System.Security.Cryptography.CryptographicException: Input data cannot
be coded as a valid certificate. ---> System.NotSupportedException:
Undefined length encoding.
  at Mono.Security.ASN1..ctor (System.Byte[] data) [0x00000]
  at Mono.Security.X509.X509Certificate.Parse (System.Byte[] data)
[0x00000]
  --- End of inner exception stack trace ---
  at Mono.Security.X509.X509Certificate.Parse (System.Byte[] data)
[0x00000]
  at Mono.Security.X509.X509Certificate..ctor (System.Byte[] data)
[0x00000]
  at
System.Security.Cryptography.X509Certificates.X509Certificate.Import
(System.Byte[] rawData, System.String password, X509KeyStorageFlags
keyStorageFlags) [0x00000]
  at
System.Security.Cryptography.X509Certificates.X509Certificate2.Import
(System.Byte[] rawData, System.String password, X509KeyStorageFlags
keyStorageFlags) [0x00000]
  at
System.Security.Cryptography.X509Certificates.X509Certificate2.Import
(System.String fileName, System.String password, X509KeyStorageFlags
keyStorageFlags) [0x00000]
  at
System.Security.Cryptography.X509Certificates.X509Certificate2..ctor
(System.String fileName, System.String password) [0x00000]
  at Smime.Signer.Sign (System.String pkcs12Path, System.String
password, System.String message) [0x00000]

Agrego que el archivo pkcs12 que utilizo para las pruebas es valido, 
ya que es el mismo que utilizo normalmente para firmar mensajes
de email.

Espero comentarios, muchas gracias.

-- 
por favor evita el enviarme archivos adjuntos de MS Word. 
Ver:http://www.gnu.org/philosophy/no-word-attachments.es.html
printk("fent linux\n");

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