Using SFL to verify

I'm having some trouble using SFL to verify a message that I received. I'm 
using the Crypto++ library, and verify is failing. Here is my code:

	// put it in the instance list in pCSMIME
	if (pCSMIME->m_pCSInsts == NULL)
	{
		if ((pCSMIME->m_pCSInsts = new CSM_CSInstLst) == NULL)
			return E_OUTOFMEMORY;
	}

	// Set up a RSA instance
	if ((pNewInstance = new CSM_CSInst) == NULL)
		return E_OUTOFMEMORY;
	pCSMIME->m_pCSInsts->AppendL(pNewInstance);

	// generate a new FREE CTI class
	if ((pFree = new CSM_Free3(rsa)) == NULL)
		return E_OUTOFMEMORY;
	// CSM_Free3 constructor sets Alg IDs
	// now, fill in what we can in the instance
	// store token interface pointer
	pNewInstance->SetTokenInterface((CSM_TokenInterface *)pFree);

	// Create the contentInfoMsg class with the content which was
	// loaded in a buffer earlier.
	CSM_ContentInfoMsg contentInfo(&buf);
	if(contentInfo.IsSignedData())
	{
		CSM_MsgToVerify msg(&contentInfo);
		msg.PreProc(pCSMIME);
		long l = msg.Verify(pCSMIME);
	}


Maybe someone can suggest what I'm missing or using incorrectly. Right now 
verify doesn't look like it does anything.  Do I have to load certificates 
into the instance? If so, how do I extract them from the e-mail and put them 
into the instance?

Thanks,

Margaret

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