if (CryptExportKey(
			hSenderPrivateKey,
			0,
			PRIVATEKEYBLOB,
			0,
			NULL,
			&dwBlobLenPrivateKey)) {
		printf("Size of the BLOB for the responder public key determined. \n");
	}

	HCERTSTORE hCertStore = CertOpenSystemStore(0, "MY");

	PCCERT_CONTEXT pUserCert = CertEnumCertificatesInStore(hCertStore, NULL);

	DWORD dwBlobLenPrivateKey;
	BYTE *pbBlobPrivateKey = NULL;

	HCRYPTPROV hProvSender = 0;         // Дескриптор CSP отправителя
	DWORD      dwKeySpecSender;

	HCRYPTKEY hSenderPrivateKey = 0;        // Дескриптор открытого ключа отправителя

	if (CryptAcquireCertificatePrivateKey(
			pUserCert,
			0,
			NULL,
			&hProvSender,
			&dwKeySpecSender,
			NULL)) {
		printf("The CSP handle has been acquired. \n");
	}
	else {
		printf("Error during CryptAcquireCertificatePrivateKey.");
	}


	if (CryptGetUserKey(
			hProvSender,
			dwKeySpecSender,
			&hSenderPrivateKey)) {
		printf("The sender private key has been acquired. \n");
	}
	else {
		printf("Error during CryptGetUserKey private key.");
	}
	

	if (CryptExportKey(
			hSenderPrivateKey,
			0,
			PRIVATEKEYBLOB,
			0,
			NULL,
			&dwBlobLenPrivateKey)) {
		printf("Size of the BLOB for the responder public key determined. \n");
	}
	else {
		printf("Error computing BLOB length.");
	}

	pbBlobPrivateKey = (BYTE *) malloc(dwBlobLenPrivateKey);

	if (pbBlobPrivateKey) {
		printf("Memory has been allocated for the BLOB. \n");
	}
	else {
		printf("Out of memory. \n");
	}


	if (CryptExportKey(
			hSenderPrivateKey,
			0,
			PRIVATEKEYBLOB,
			0,
			pbBlobPrivateKey,
			&dwBlobLenPrivateKey)) {
		printf("Contents have been written to the BLOB. \n");
	}
	else {
		printf("Error during CryptExportKey.");
	}

if(CryptExportKey(
			hSenderKey,
			hSenderAgreeKey,
			PRIVATEKEYBLOB,
			0,
			NULL,
			&dwBlobLen ))
	{
		printf("Size of the BLOB for the sender key determined. \n");
	}
	else
	{
		HandleError("Error computing BLOB length.");
	}