VerifyPin.ino

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/*
 * SPDX-License-Identifier: LGPL-3.0-or-later
 * Copyright (c) 2026 Cryptnox SA
 */

#include <CryptnoxWallet.h>
#include <SPI.h>

#define PN532_SS_PIN  (10U)

#define DEMO_PIN      "000000000"

ArduinoLoggerAdapter   serialAdapter;

PN532Adapter           nfc(serialAdapter, PN532_SS_PIN, &SPI);

ArduinoCryptoProvider  cryptoProvider;

ArduinoPlatform        platform;

CryptnoxWallet         wallet(nfc, serialAdapter, cryptoProvider, platform);

void setup() {
    serialAdapter.begin(115200);
    delay(1000);                              /* Arduino R4: wait for Serial */
    SPI.begin();
 
    if (!wallet.begin()) {
        serialAdapter.println(F("PN532 init failed"));
        while (1);
    }
}

void loop() {
    CW_SecureSession session;
    if (!wallet.connect(session)) {
        serialAdapter.println(F("Card not detected"));
        wallet.disconnect(session);
        delay(1000);
        return;
    }
 
    if (!wallet.verifyPin(session,
                          reinterpret_cast<const uint8_t*>(DEMO_PIN),
                          (uint8_t)strlen(DEMO_PIN))) {
        /* CRITICAL: do NOT loop on failure — each wrong PIN attempt
         * decrements the card's retry counter (typically 3-5 tries) and
         * permanently blocks the PIN at zero. Halt and let the developer
         * inspect the Serial output / fix DEMO_PIN before retrying. */
        serialAdapter.println(F("PIN rejected — halting to protect retry counter"));
        wallet.disconnect(session);
        while (1);
    }
 
    serialAdapter.println(F("PIN accepted"));
    wallet.disconnect(session);
    delay(1000);
}