Cannot find the certificate and private key for decryption.

	//--------------------------------------------------------------------
	// Получение дескриптора контекста криптографического провайдера.
	//--------------------------------------------------------------------
	if (!CryptAcquireContext(
		&hProv, 
		(LPCSTR)pbContainerName, 
		"Crypto-Pro GOST R 34.10-2001 Cryptographic Service Provider", 
		PROV_GOST_2001_DH, 
		CRYPT_MACHINE_KEYSET)) 
	{
		char *msg = getErorrMessage("CryptAcquireContext() failed");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
	}

	printf("\nOK1");
	//--------------------------------------------------------------------
	// Получение пользовательского ключа (по двум типам ключей)
	//--------------------------------------------------------------------
	DWORD keyType = AT_SIGNATURE;
	if (!CryptGetUserKey(hProv, keyType, &hKey)) {
		keyType = AT_KEYEXCHANGE;
		if (!CryptGetUserKey(hProv, keyType, &hKey)) {
			char *msg = getErorrMessage("CryptGetUserKey() failed. Tried both key types.");
			throwCryptoException(env, msg);
			Error = true;
			goto Error;
		}
	}
	
	printf("\ngetting key");
	//--------------------------------------------------------------------
	// Определение размера пользовательского сертификата.
	//--------------------------------------------------------------------	
	if (!CryptGetKeyParam (hKey, KP_CERTIFICATE, NULL,&dwUserCertLength, 0)) {
		char *msg = getErorrMessage("GetKeyParam() failed(first).");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
	}

	printf("\nCertLength");

	//--------------------------------------------------------------------
	// Распределение памяти под буфер пользовательского сертификата.
	//--------------------------------------------------------------------
	if (!(pbUserCert = (BYTE *)VirtualAlloc(NULL,dwUserCertLength,MEM_COMMIT,PAGE_READWRITE))){
		char *msg = getErorrMessage("VirtualAlloc() for UserCert failed.");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
	}

	printf("\nUserCertAlloc");
	//--------------------------------------------------------------------
	// Получение пользовательского сертификата.
	//--------------------------------------------------------------------
	if (!CryptGetKeyParam(hKey, KP_CERTIFICATE, pbUserCert,&dwUserCertLength, 0)) {
		char *msg = getErorrMessage("CryptGetKeyParam() failed(second).");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
	}

	printf("\nUserCertGet");
	//--------------------------------------------------------------------
	// Формирование контекста сертификата.
	//--------------------------------------------------------------------
	if (!(pUserCert = CertCreateCertificateContext(X509_ASN_ENCODING, pbUserCert, dwUserCertLength))) {
		char *msg = getErorrMessage("CertCreateCertificateContext() failed.");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
	}

	printf("\nUserCertContext");

	//--------------------------------------------------------------------
	// Инициализация структуры для подписи.
	//--------------------------------------------------------------------
    SigParams.cbSize = sizeof(CRYPT_SIGN_MESSAGE_PARA);
    SigParams.dwMsgEncodingType = X509_ASN_ENCODING;
    SigParams.pSigningCert = pUserCert;
	SigParams.HashAlgorithm.pszObjId = pUserCert->pCertInfo->SignatureAlgorithm.pszObjId;
	SigParams.HashAlgorithm.Parameters.cbData = 0;//pUserCert->pCertInfo->SignatureAlgorithm.Parameters.cbData;
	SigParams.HashAlgorithm.Parameters.pbData = NULL;
    SigParams.cMsgCert = 1;
    SigParams.rgpMsgCert = &pUserCert;
    SigParams.cAuthAttr = 0;
    SigParams.dwInnerContentType = 0;
    SigParams.cMsgCrl = 0;
    SigParams.cUnauthAttr = 0;
    SigParams.dwFlags = 0;
    SigParams.pvHashAuxInfo = NULL;
    SigParams.rgAuthAttr = NULL;

	printf("\nSigParamsInit");
	
	//--------------------------------------------------------------------
	// Определение размера буфера для CMS сообщения.
	//--------------------------------------------------------------------	
	//pbBuffer - данные для подписыванеия
	const BYTE* MessageArray[] = {pbBuffer};
	DWORD_PTR MessageSizeArray[1];
	MessageSizeArray[0] = dwBufferLen;
	DWORD cbSignedMessageBlob;
	if(!CryptSignMessage(
        &SigParams,
        FALSE,
        1,
        MessageArray,
        MessageSizeArray,
        NULL,
        &cbSignedMessageBlob))
    {
        char *msg = getErorrMessage("CryptSignMessage() failed(first).");
		throwCryptoException(env, msg);
		Error = true;
		goto Error;
    }
	else 
		printf(TEXT("%d bytes needed for the encoded BLOB.\n"), cbSignedMessageBlob);

SigParams.dwMsgEncodingType = X509_ASN_ENCODING;

SigParams.dwMsgEncodingType = PKCS_7_ASN_ENCODING;