CRYPT_DECRYPT_MESSAGE_PARA DecryptPara;
	CRYPT_VERIFY_MESSAGE_PARA VerifyPara;
	BYTE *pbDecrypted;
	DWORD cbDecrypted;

	// Open the certificate store.
	DecryptPara.cbSize = sizeof(CRYPT_DECRYPT_MESSAGE_PARA);
	DecryptPara.dwMsgAndCertEncodingType = MY_ENCODING_TYPE;
            DecryptPara.cCertStore = 1;
	DecryptPara.rghCertStore = &hCertStore; // вот здесь передается адрес хранилища, и что ??? этого разве достаточно?

	VerifyPara.cbSize = sizeof(CRYPT_VERIFY_MESSAGE_PARA);
            VerifyPara.dwMsgAndCertEncodingType = MY_ENCODING_TYPE;
	VerifyPara.hCryptProv = 0;
	VerifyPara.pfnGetSignerCertificate = 0;
            VerifyPara.pvGetArg = 0;
	pbDecrypted = NULL;
	cbDecrypted = 0;

if(!(CryptDecryptAndVerifyMessageSignature(
        &DecryptPara,
        &VerifyPara,
        0,
        pbSignedAndEncryptedBlob,
        cbSignedAndEncryptedBlob,
        0,
        &cbDecrypted,
        NULL,
        NULL)))
{
	Form1->Memo1->Lines->Add("Failed getting size.");
}
DWORD err = GetLastError();
if(!(pbDecrypted = (BYTE *)malloc(cbDecrypted)))
	{
		Form1->Memo1->Lines->Add("Memory allocation failed.");
	}