Add signed data to the PKCS#7 CMS signature detached on visual c++

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C++

cryptography

Is there any way to add content "file" to the signed message?

In Msdn docs has: http://msdn.microsoft.com/en-us/library/aa382052(v=vs.85).aspx
Adding content to the encoded message. But I wanted to add to the message and not make a message only with the data.

I have a signed message .p7s detached. I only want to make this attached.

On http://msdn.microsoft.com/en-us/library/aa380220(v=VS.85).aspx
CryptMsgControl Function said:
The control operations provided by this function are used for decryption, signature and hash verification, and the addition and deletion of certificates, certificate revocation lists (CRLs), signers, and unauthenticated. But not, EncapsulatedContentInfo... :(

SignedCms
http://msdn.microsoft.com/en-us/library/system.security.cryptography.pkcs.signed
cms(v=VS.100).aspx


Dont let me add content info...


I'm using Visual Studio 2005, c++.

Thanks,