1. Eliminating Plaintext Strings in C++#
Hardcoding sensitive strings inside C++ executables allows reverse engineers to extract them using IDA Pro or strings. With qPapel Server-Side Strings, secrets are stored encrypted on PapelShip servers and fetched into RAM using a 12-digit Access ID. The API signature is:
cpp
char* FetchString(QPCTX c, const char* stringId, const char* licenseKey);stringId: 12-digit access ID from your dashboard (e.g.123456789012).licenseKey: Required for protected strings, or""for public strings.
2. C++ Usage: Public vs. Protected Strings#
cpp
#include <iostream>
#include class="text-emerald-400">"qPapelLib.h"
#pragma comment(lib, class="text-emerald-400">"qPapelLib.lib")
#pragma comment(lib, class="text-emerald-400">"libsodium.lib")
void FetchConfiguration(QPCTX ctx, const std::string& userKey) {
// Public string (no key required)
char* welcome = qpapel::FetchString(ctx, class="text-emerald-400">"123456789012", class="text-emerald-400">"");
if (welcome) {
std::cout << class="text-emerald-400">"[Public]: " << welcome << std::endl;
qpapel::FreeString(welcome);
}
// Protected string (key required)
char* secret = qpapel::FetchString(ctx, class="text-emerald-400">"987654321098", userKey.c_str());
if (secret) {
std::cout << class="text-emerald-400">"[Protected]: " << secret << std::endl;
qpapel::FreeString(secret);
} else {
char* err = qpapel::GetLastStatus(ctx);
std::cerr << class="text-emerald-400">"[Error]: " << (err ? err : class="text-emerald-400">"Access Denied") << std::endl;
if (err) qpapel::FreeString(err);
}
}> Warning: The returned char* buffer is dynamically allocated by the SDK. You must call qpapel::FreeString(value) when done to prevent memory leaks.
3. Use Cases#
- Feature Flags: Fetch
"true"or"false"strings to enable/disable features server-side without releasing new builds. - API Endpoints: Store backend URLs encrypted so they never appear in disk-resident binaries.
- Dynamic Config: Push JSON configuration to clients at runtime.
Explore Server-Side Strings.