Создание подписи по хэш-значению (упрощённые функции)

    CRYPT_SIGN_MESSAGE_PARA signPara = {sizeof(signPara)};
    signPara.dwMsgEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
    signPara.pSigningCert = context;
    signPara.HashAlgorithm.pszObjId = (LPSTR) GetHashOid(context);

    CADES_SERVICE_CONNECTION_PARA tspConnectionPara = {
            sizeof(tspConnectionPara)};
    tspConnectionPara.wszUri = SERVICE_URL_2012; // Адрес веб - сервиса со службой штампов времени

    CADES_SIGN_PARA cadesSignPara = {sizeof(cadesSignPara)};
    cadesSignPara.dwCadesType =
            CADES_X_LONG_TYPE_1; // Указываем тип усовершенствованной подписи
    // CADES_X_LONG_TYPE_1
    cadesSignPara.pTspConnectionPara = &tspConnectionPara;

    CADES_SIGN_MESSAGE_PARA para = {sizeof(para)};
    para.pSignMessagePara = &signPara;
    para.pCadesSignPara = &cadesSignPara;

    // Формируем данные для подписания
    vector<unsigned char> data(10, 25);

    // Получение хэша данных
    HCRYPTHASH hash(0);
    if (!CryptCreateHash(hProv, CALG_GR3411_2012_256, 0, 0, &hash)) {
        CryptReleaseContext(hProv, 0);
        CertFreeCertificateContext(context);
        CertCloseStore(hStoreHandle, 0);
        cout << "CryptCreateHash() failed" << endl;
        return -1;
    }

    DWORD cbToBeSigned(0);
    DWORD cb = sizeof(cbToBeSigned);
    BYTE *pbToBeSigned;

    if (!CryptHashData(hash, &data[0], (DWORD)data.size(), 0)) {
        CryptDestroyHash(hash);
        CryptReleaseContext(hProv, 0);
        CertFreeCertificateContext(context);
        CertCloseStore(hStoreHandle, 0);
        cout << "CryptHashData() failed" << endl;
        return -1;
    }

    if (!CryptGetHashParam(hash, HP_HASHSIZE, (LPBYTE)&cbToBeSigned, &cb, 0)) {
        CryptDestroyHash(hash);
        CryptReleaseContext(hProv, 0);
        CertFreeCertificateContext(context);
        CertCloseStore(hStoreHandle, 0);
        cout << "CryptGetHashParam() failed" << endl;
        return -1;
    }

    pbToBeSigned = new BYTE[cbToBeSigned];
    if (!CryptGetHashParam(hash, HP_HASHVAL, pbToBeSigned, &cbToBeSigned, 0)) {
        delete[] pbToBeSigned;
        CryptDestroyHash(hash);
        CryptReleaseContext(hProv, 0);
        CertFreeCertificateContext(context);
        CertCloseStore(hStoreHandle, 0);
        cout << "CryptGetHashParam() failed" << endl;
        return -1;
    }

    PCRYPT_DATA_BLOB pSignedMessage = 0;

    string contentType(szOID_RSA_data);

    // Создаем подписанное сообщение
    if (!CadesSignHash(&para, pbToBeSigned, cbToBeSigned, contentType.c_str(),
                       &pSignedMessage)) {
        delete[] pbToBeSigned;
        CryptDestroyHash(hash);
        CryptReleaseContext(hProv, 0);
        CertFreeCertificateContext(context);
        CertCloseStore(hStoreHandle, 0);
        cout << "CadesSignHash() failed" << endl;
        return -1;
    }

    delete[] pbToBeSigned;

    vector<unsigned char> message(pSignedMessage->cbData);
    copy(pSignedMessage->pbData,
         pSignedMessage->pbData + pSignedMessage->cbData, message.begin());