const ValidationCore::SignatureFileInfo& file_info,
common_installer::PrivilegeLevel* level,
common_installer::CertificateInfo* cert_info,
bool check_reference, std::string* error_message);
const ValidationCore::SignatureFileInfo& file_info,
common_installer::PrivilegeLevel* level,
common_installer::CertificateInfo* cert_info,
bool check_reference, std::string* error_message);