void signBuffer(std::shared_ptr<uint8_t[]> &out, uint32_t &outSize)
{
    std::shared_ptr<uint8_t[]> newBuffer;

    std::string caPath = "ca.crt";
    std::string crlPath = "ca.crl";
    std::string userKeyPath = "firm.crt";
    // std::string caPath = "ca.crt";
    // std::string crlPath = "ca.crl";
    // std::string userKeyPath = "firm.dkpc";

    std::vector<uint8_t> caBuf = getFileContent(caPath);
    std::vector<uint8_t> crlBuf = getFileContent(crlPath);
    std::vector<uint8_t> userKeyBuf = getFileContent(userKeyPath);

    DmCrypt::Pki::Certificate   caCert;
    DmCrypt::Pki::KeyPair   userKeyPair;
    DmCrypt::Pki::Crl   caCrl;
    DmCrypt::Pki::Certificate  userCert;
    std::string errorMessage;
    if( !DmCrypt::Pki::parseCertificate( caBuf,  &caCert, errorMessage ) ) {
        std::cerr << "Loading CA cert " << "Failed to load CA cert: " <<  errorMessage << std::endl;
        return;
    }

    if( !DmCrypt::Pki::parseCrl( crlBuf, &caCrl, errorMessage ) ) {
        std::cerr << "Loading CRL " << "Failed to load CRL: "<<   errorMessage << std::endl;
        return;
    }

    if( !DmCrypt::Pki::verifyCrl( &caCrl, &caCert, errorMessage ) ) {
        std::cerr << "Loading CRL " << "CRL verification failed: "<<   errorMessage << std::endl;
        return;
    }

    if( !DmCrypt::Pki::parseKeyPair( userKeyBuf, "jQ$jPT7osUq&W69", &userKeyPair, errorMessage ) ) {
        std::cerr << "Loading key pair " << "Failed to load key pair: " <<  errorMessage << std::endl;
        return;
    }

    BinarySignProcessor sp(out.get(), outSize);

    if( !DmCrypt::CryptoProviderInternal::sign( &sp, &userKeyPair,  &caCrl, &caCert, errorMessage ) ) {
        std::cerr << "File signing " << "Failed to sign file: " <<  errorMessage << std::endl;
        return;
    }
    newBuffer.reset(new uint8_t[outSize + sp.m_SignSize]);

    memcpy(newBuffer.get(),sp.m_signBuffer, sp.m_SignSize);
    memcpy(newBuffer.get()+  sp.m_SignSize,out.get(), outSize);
    out = newBuffer;
    outSize = outSize + sp.m_SignSize;


}