Question

Sign a XML file by SmartCard on the .NET

Asked by: Wemerson

I'm having problems to access the private key of the certificate stored on the chip card.

If i access the private key of a certificate with private key stored on the machine certificate store it works well.....but in the case of the chip card, when i read the X509Certificate2.PrivateKey property, i receive a System.Security.Cryptography.CryptographicException: cryptographic service provider (CSP) does not support this key algorithm
thanks !!!

Note: I have a program in Java signing the XML file with my SmartCard.
              There is a component paid SecureBlackbox (http://www.eldos.com/sbbdev/), which also makes this signature using my SmartCard. Is there any way to make the signature with. Native net.

// Example C#
// Open the My certificate store.
   X509Store storeMy = new X509Store(StoreName.My,
      StoreLocation.CurrentUser);
   storeMy.Open(OpenFlags.ReadOnly);
   X509Certificate2Collection  certs=X509Certificate2UI.SelectFromCollection   
      (storeMy.Certificates, "Selection", "Select a certificate", 
      X509SelectionFlag.SingleSelection);
   X509Certificate2 cert=certs[0];
   storeMy.Close();
 
   // Returns TRUE
   cert.HasPrivateKey;
 
   /* Here i receive a System.Security.Cryptography.CryptographicException: cryptographic service provider (CSP) does not support this key algorithm (It occurs only when i am accessing the private key of the certificate stored on the chip card...if the certificate with private key is stored on the machine certificate store it works well..)*/
   cert.PrivateKey;
 
//Example Delphi® 2007 for Microsoft® .NET
var
  vCertificados : X509Certificate2Collection;
  vStore : X509Store;
begin
  vStore        := nil;
  vCertificados := nil;
  try
    Result := False;
    vStore := X509Store.Create;
    vStore.Open(OpenFlags.ReadOnly);
    vCertificados := vStore.Certificates;
    vCertificados := X509Certificate2UI.SelectFromCollection(vCertificados, "Selection", "Select a certificate", X509SelectionFlag.SingleSelection);
// Returns TRUE
   vCertificados[0].HasPrivateKey;
 
   /* Here i receive a System.Security.Cryptography.CryptographicException: cryptographic service provider (CSP) does not support this key algorithm (It occurs only when i am accessing the private key of the certificate stored on the chip card...if the certificate with private key is stored on the machine certificate store it works well..)*/
   vCertificados[0].PrivateKey;
    vStore.Close;
  finally
    vStore.Free;
    vCertificados.Free;
  end;
end;

                                  
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Answers

 

by: DaveHowePosted on 2008-07-11 at 06:30:39ID: 21982175

The standard you need to reach is called pkcs #11 (digitally signing and verifying using smartcards) or, from the programming perspective, cryptoki (which is the API for accessing pkcs#11 devices such as smartcards)

cryptoki however is a c based api, so you need a suitable wrapper to translate that to dotnet; SBB is such a wrapper class, although a commercial one. there are efforts underway to produce an open source wrapper for c#, plus examples (eg this one from msdn - http://tinyurl.com/5d4z64 ) of people attempting to call the c dlls directly from c#

there is no native (ie microsoft supplied) dotnet library for pkcs#11, at least not as far as I know. if anyone else can point you to one, he deserves the points ;)

20120131-EE-VQP-002

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