Momentum-Apps/scenes/keys.c

#include "../metroflip_i.h"
#include "keys.h"
#include <bit_lib.h>
#include <nfc/protocols/mf_classic/mf_classic.h>
#include <nfc/protocols/mf_classic/mf_classic_poller.h>
#include <nfc/nfc.h>
#include <nfc/protocols/mf_classic/mf_classic_poller_sync.h>
#include <string.h>

#define TAG "keys_check"

const MfClassicKeyPair troika_1k_key[1] = {
    {.a = 0x08b386463229},
};

const MfClassicKeyPair troika_4k_key[1] = {
    {.a = 0xA73F5DC1D333},
};

const MfClassicKeyPair smartrider_verify_key[] = {
    {.a = 0x2031D1E57A3B},
};

const MfClassicKeyPair charliecard_1k_verify_key[] = {
    {.a = 0x5EC39B022F2B},
};

const MfClassicKeyPair bip_1k_verify_key[1] = {
    {.a = 0x3a42f33af429},
};

const MfClassicKeyPair metromoney_1k_verify_key[1] = {
    {.a = 0x9C616585E26D},
};

static bool charliecard_verify(Nfc* nfc) {
    bool verified = false;
    FURI_LOG_I(TAG, "verifying charliecard..");

    do {
        const uint8_t verify_sector = 1;
        const uint8_t verify_block = mf_classic_get_first_block_num_of_sector(verify_sector) + 1;
        FURI_LOG_I(TAG, "Verifying sector %u", verify_sector);

        MfClassicKey key = {0};
        bit_lib_num_to_bytes_be(charliecard_1k_verify_key[0].a, COUNT_OF(key.data), key.data);

        MfClassicAuthContext auth_context;
        MfClassicError error =
            mf_classic_poller_sync_auth(nfc, verify_block, &key, MfClassicKeyTypeA, &auth_context);
        if(error != MfClassicErrorNone) {
            FURI_LOG_I(TAG, "Failed to read block %u: %d", verify_block, error);
            break;
        }

        verified = true;
    } while(false);

    return verified;
}

bool bip_verify(Nfc* nfc) {
    bool verified = false;

    do {
        const uint8_t verify_sector = 0;
        uint8_t block_num = mf_classic_get_first_block_num_of_sector(verify_sector);
        FURI_LOG_I(TAG, "Verifying sector %u", verify_sector);

        MfClassicKey key = {};
        bit_lib_num_to_bytes_be(bip_1k_verify_key[0].a, COUNT_OF(key.data), key.data);

        MfClassicAuthContext auth_ctx = {};
        MfClassicError error =
            mf_classic_poller_sync_auth(nfc, block_num, &key, MfClassicKeyTypeA, &auth_ctx);

        if(error != MfClassicErrorNone) {
            FURI_LOG_I(TAG, "Failed to read block %u: %d", block_num, error);
            break;
        }

        verified = true;
    } while(false);

    return verified;
}

static bool metromoney_verify(Nfc* nfc) {
    bool verified = false;

    do {
        const uint8_t ticket_sector_number = 1;
        const uint8_t ticket_block_number =
            mf_classic_get_first_block_num_of_sector(ticket_sector_number) + 1;
        FURI_LOG_D(TAG, "Verifying sector %u", ticket_sector_number);

        MfClassicKey key = {0};
        bit_lib_num_to_bytes_be(metromoney_1k_verify_key[0].a, COUNT_OF(key.data), key.data);

        MfClassicAuthContext auth_context;
        MfClassicError error = mf_classic_poller_sync_auth(
            nfc, ticket_block_number, &key, MfClassicKeyTypeA, &auth_context);
        if(error != MfClassicErrorNone) {
            FURI_LOG_D(TAG, "Failed to read block %u: %d", ticket_block_number, error);
            break;
        }

        verified = true;
    } while(false);

    return verified;
}

static bool smartrider_verify(Nfc* nfc) {
    bool verified = false;

    do {
        const uint8_t block_number = mf_classic_get_first_block_num_of_sector(0) + 1;
        FURI_LOG_D(TAG, "Verifying sector 0");

        MfClassicKey key = {0};
        bit_lib_num_to_bytes_be(smartrider_verify_key[0].a, COUNT_OF(key.data), key.data);

        MfClassicAuthContext auth_context;
        MfClassicError error =
            mf_classic_poller_sync_auth(nfc, block_number, &key, MfClassicKeyTypeA, &auth_context);
        if(error != MfClassicErrorNone) {
            FURI_LOG_D(TAG, "Failed to read block %u: %d", block_number, error);
            break;
        }

        verified = true;
    } while(false);

    return verified;
}

static bool troika_get_card_config(TroikaCardConfig* config, MfClassicType type) {
    bool success = true;

    if(type == MfClassicType1k) {
        config->data_sector = 11;
        config->keys = troika_1k_key;
    } else if(type == MfClassicType4k) {
        config->data_sector = 8; // Further testing needed
        config->keys = troika_4k_key;
    } else {
        success = false;
    }

    return success;
}

static bool troika_verify_type(Nfc* nfc, MfClassicType type) {
    bool verified = false;

    do {
        TroikaCardConfig cfg = {};
        if(!troika_get_card_config(&cfg, type)) break;

        const uint8_t block_num = mf_classic_get_first_block_num_of_sector(cfg.data_sector);
        FURI_LOG_D(TAG, "Verifying sector %lu", cfg.data_sector);

        MfClassicKey key = {0};
        bit_lib_num_to_bytes_be(cfg.keys[0].a, COUNT_OF(key.data), key.data);

        MfClassicAuthContext auth_context;
        MfClassicError error =
            mf_classic_poller_sync_auth(nfc, block_num, &key, MfClassicKeyTypeA, &auth_context);
        if(error != MfClassicErrorNone) {
            FURI_LOG_D(TAG, "Failed to read block %u: %d", block_num, error);
            break;
        }
        FURI_LOG_D(TAG, "Verify success!");
        verified = true;
    } while(false);

    return verified;
}

static bool troika_verify(Nfc* nfc) {
    return troika_verify_type(nfc, MfClassicType1k) || troika_verify_type(nfc, MfClassicType4k);
}

CardType determine_card_type(Nfc* nfc) {
    FURI_LOG_I(TAG, "checking keys..");
    UNUSED(bip_verify);

    if(bip_verify(nfc)) {
        return CARD_TYPE_METROMONEY;
    } else if(metromoney_verify(nfc)) {
        return CARD_TYPE_METROMONEY;
    } else if(smartrider_verify(nfc)) {
        return CARD_TYPE_SMARTRIDER;
    } else if(troika_verify(nfc)) {
        return CARD_TYPE_TROIKA;
    } else if(charliecard_verify(nfc)) {
        return CARD_TYPE_CHARLIECARD;
    } else {
        FURI_LOG_I(TAG, "its unknown");
        return CARD_TYPE_UNKNOWN;
    }
}