Adding attributes to pkcs7/cms signature

From: Jayant Sane (JayantSane_at_discussions.microsoft.com)
Date: 01/27/05 

Date: Thu, 27 Jan 2005 11:13:03 -0800

I am using .Net 2.0 (v2.0.41115) to create a signature where I would like to
add some attributes (either signed or unsigned) to it.

However in all of the relevant classes under
System.Security.Cryptography.Pkcs namespace, they only allow you to retrieve
attributes from a signed object. Meaning I cant see a way to add them to a
signature while creating it. I have following code snippet to illustrate what
I am trying to do:

    X509Store certStore = new X509Store();
    certStore.Open(OpenFlags.ReadOnly);

    X509CertificateEx signerCert = null;
    // find the signer cert and set the above var to it..

    CmsSigner signer = new CmsSigner(signerCert);
    SignedCms signedCMS = new SignedCms(content, false);

   // what do i do to add either signed or unsigned attribute
   // to my signature???

    signedCMS.ComputeSignature(signer);
    byte[] signedData = signedCMS.Encode();
...

I know how to add attributes to signature using CryptoAPI .

TIA.
Jay

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