Moscow social card parser

applications/main/nfc/api/mosgortrans/mosgortrans_util.c

@@ -2,6 +2,20 @@
 
 #define TAG "Mosgortrans"
 
+void render_section_header(
+    FuriString* str,
+    const char* name,
+    uint8_t prefix_separator_cnt,
+    uint8_t suffix_separator_cnt) {
+    for(uint8_t i = 0; i < prefix_separator_cnt; i++) {
+        furi_string_cat_printf(str, ":");
+    }
+    furi_string_cat_printf(str, "[ %s ]", name);
+    for(uint8_t i = 0; i < suffix_separator_cnt; i++) {
+        furi_string_cat_printf(str, ":");
+    }
+}
+
 void from_days_to_datetime(uint32_t days, DateTime* datetime, uint16_t start_year) {
     uint32_t timestamp = days * 24 * 60 * 60;
     DateTime start_datetime = {0};

applications/main/nfc/api/mosgortrans/mosgortrans_util.h

@@ -10,6 +10,11 @@
 extern "C" {
 #endif
 
+void render_section_header(
+    FuriString* str,
+    const char* name,
+    uint8_t prefix_separator_cnt,
+    uint8_t suffix_separator_cnt);
 bool mosgortrans_parse_transport_block(const MfClassicBlock* block, FuriString* result);
 
 #ifdef __cplusplus

applications/main/nfc/api/nfc_app_api_table_i.h

@@ -15,4 +15,11 @@ static constexpr auto nfc_app_api_table = sort(create_array_t<sym_entry>(
     API_METHOD(
         mosgortrans_parse_transport_block,
         bool,
-        (const MfClassicBlock* block, FuriString* result))));
+        (const MfClassicBlock* block, FuriString* result)),
+    API_METHOD(
+        render_section_header,
+        void,
+        (FuriString * str,
+         const char* name,
+         uint8_t prefix_separator_cnt,
+         uint8_t suffix_separator_cnt))));

applications/main/nfc/application.fam

@@ -92,6 +92,15 @@ App(
     sources=["plugins/supported_cards/troika.c"],
 )
 
+App(
+    appid="social_moscow_parser",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="social_moscow_plugin_ep",
+    targets=["f7"],
+    requires=["nfc"],
+    sources=["plugins/supported_cards/social_moscow.c"],
+)
+
 App(
     appid="washcity_parser",
     apptype=FlipperAppType.PLUGIN,

applications/main/nfc/plugins/supported_cards/social_moscow.c

@@ -0,0 +1,301 @@
+#include "nfc_supported_card_plugin.h"
+#include <core/check.h>
+
+#include <flipper_application/flipper_application.h>
+
+#include <nfc/nfc_device.h>
+#include <bit_lib/bit_lib.h>
+#include <nfc/protocols/mf_classic/mf_classic_poller_sync.h>
+#include "../../api/mosgortrans/mosgortrans_util.h"
+#include "furi_hal_rtc.h"
+
+#define TAG "Social_Moscow"
+
+typedef struct {
+    uint64_t a;
+    uint64_t b;
+} MfClassicKeyPair;
+
+typedef struct {
+    const MfClassicKeyPair* keys;
+    uint32_t data_sector;
+} SocialMoscowCardConfig;
+
+static const MfClassicKeyPair social_moscow_1k_keys[] = {
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025},
+    {.a = 0x2735fc181807, .b = 0xbf23a53c1f63},
+    {.a = 0x2aba9519f574, .b = 0xcb9a1f2d7368},
+    {.a = 0x84fd7f7a12b6, .b = 0xc7c0adb3284f},
+    {.a = 0x73068f118c13, .b = 0x2b7f3253fac5},
+    {.a = 0x186d8c4b93f9, .b = 0x9f131d8c2057},
+    {.a = 0x3a4bba8adaf0, .b = 0x67362d90f973},
+    {.a = 0x8765b17968a2, .b = 0x6202a38f69e2},
+    {.a = 0x40ead80721ce, .b = 0x100533b89331},
+    {.a = 0x0db5e6523f7c, .b = 0x653a87594079},
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026},
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026},
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026},
+    {.a = 0x2aba9519f574, .b = 0xcb9a1f2d7368},
+    {.a = 0x84fd7f7a12b6, .b = 0xc7c0adb3284f},
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025}};
+
+static const MfClassicKeyPair social_moscow_4k_keys[] = {
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025}, //1
+    {.a = 0x2735fc181807, .b = 0xbf23a53c1f63}, //2
+    {.a = 0x2aba9519f574, .b = 0xcb9a1f2d7368}, //3
+    {.a = 0x84fd7f7a12b6, .b = 0xc7c0adb3284f}, //4
+    {.a = 0x73068f118c13, .b = 0x2b7f3253fac5}, //5
+    {.a = 0x186d8c4b93f9, .b = 0x9f131d8c2057}, //6
+    {.a = 0x3a4bba8adaf0, .b = 0x67362d90f973}, //7
+    {.a = 0x8765b17968a2, .b = 0x6202a38f69e2}, //8
+    {.a = 0x40ead80721ce, .b = 0x100533b89331}, //9
+    {.a = 0x0db5e6523f7c, .b = 0x653a87594079}, //10
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026}, //11
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026}, //12
+    {.a = 0x51119dae5216, .b = 0xd8a274b2e026}, //13
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025}, //14
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025}, //15
+    {.a = 0xa0a1a2a3a4a5, .b = 0x7de02a7f6025}, //16
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //17
+    {.a = 0x2aba9519f574, .b = 0xcb9a1f2d7368}, //18
+    {.a = 0x84fd7f7a12b6, .b = 0xc7c0adb3284f}, //19
+    {.a = 0x2aba9519f574, .b = 0xcb9a1f2d7368}, //20
+    {.a = 0x84fd7f7a12b6, .b = 0xc7c0adb3284f}, //21
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //22
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //23
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //24
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //25
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //26
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //27
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //28
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //29
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //30
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //31
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //32
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //33
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //34
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //35
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //36
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //37
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //38
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //39
+    {.a = 0xa229e68ad9e5, .b = 0x49c2b5296ef4}, //40
+};
+
+static bool social_moscow_get_card_config(SocialMoscowCardConfig* config, MfClassicType type) {
+    bool success = true;
+    if(type == MfClassicType1k) {
+        config->data_sector = 15;
+        config->keys = social_moscow_1k_keys;
+    } else if(type == MfClassicType4k) {
+        config->data_sector = 15;
+        config->keys = social_moscow_4k_keys;
+    } else {
+        success = false;
+    }
+
+    return success;
+}
+
+static bool social_moscow_verify_type(Nfc* nfc, MfClassicType type) {
+    bool verified = false;
+
+    do {
+        SocialMoscowCardConfig cfg = {};
+        if(!social_moscow_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[cfg.data_sector].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 social_moscow_verify(Nfc* nfc) {
+    return social_moscow_verify_type(nfc, MfClassicType1k) ||
+           social_moscow_verify_type(nfc, MfClassicType4k);
+}
+
+static bool social_moscow_read(Nfc* nfc, NfcDevice* device) {
+    furi_assert(nfc);
+    furi_assert(device);
+
+    bool is_read = false;
+
+    MfClassicData* data = mf_classic_alloc();
+    nfc_device_copy_data(device, NfcProtocolMfClassic, data);
+
+    do {
+        MfClassicType type = MfClassicType4k;
+        MfClassicError error = mf_classic_poller_sync_detect_type(nfc, &type);
+        if(error != MfClassicErrorNone) break;
+
+        data->type = type;
+        SocialMoscowCardConfig cfg = {};
+        if(!social_moscow_get_card_config(&cfg, data->type)) break;
+
+        MfClassicDeviceKeys keys = {};
+        for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
+            bit_lib_num_to_bytes_be(cfg.keys[i].a, sizeof(MfClassicKey), keys.key_a[i].data);
+            FURI_BIT_SET(keys.key_a_mask, i);
+            bit_lib_num_to_bytes_be(cfg.keys[i].b, sizeof(MfClassicKey), keys.key_b[i].data);
+            FURI_BIT_SET(keys.key_b_mask, i);
+        }
+
+        error = mf_classic_poller_sync_read(nfc, &keys, data);
+        if(error == MfClassicErrorNotPresent) {
+            FURI_LOG_W(TAG, "Failed to read data");
+            break;
+        }
+
+        nfc_device_set_data(device, NfcProtocolMfClassic, data);
+
+        is_read = (error == MfClassicErrorNone);
+    } while(false);
+
+    mf_classic_free(data);
+
+    return is_read;
+}
+
+static uint8_t calculate_luhn(uint64_t number) {
+    // https://en.wikipedia.org/wiki/Luhn_algorithm
+    // Drop existing check digit to form payload
+    uint64_t payload = number / 10;
+    int sum = 0;
+    int position = 0;
+
+    while(payload > 0) {
+        int digit = payload % 10;
+        if(position % 2 == 0) {
+            digit *= 2;
+        }
+        if(digit > 9) {
+            digit = (digit / 10) + (digit % 10);
+        }
+        sum += digit;
+        payload /= 10;
+        position++;
+    }
+
+    return (10 - (sum % 10)) % 10;
+}
+
+static uint64_t hex_num(uint64_t hex) {
+    uint64_t result = 0;
+    for(uint8_t i = 0; i < 8; ++i) {
+        uint8_t half_byte = hex & 0x0F;
+        uint64_t num = 0;
+        for(uint8_t j = 0; j < 4; ++j) {
+            num += (half_byte & 0x1) * (1 << j);
+            half_byte = half_byte >> 1;
+        }
+        result += num * pow(10, i);
+        hex = hex >> 4;
+    }
+    return result;
+}
+
+static bool social_moscow_parse(const NfcDevice* device, FuriString* parsed_data) {
+    furi_assert(device);
+
+    const MfClassicData* data = nfc_device_get_data(device, NfcProtocolMfClassic);
+
+    bool parsed = false;
+
+    do {
+        // Verify card type
+        SocialMoscowCardConfig cfg = {};
+        if(!social_moscow_get_card_config(&cfg, data->type)) break;
+
+        // Verify key
+        const MfClassicSectorTrailer* sec_tr =
+            mf_classic_get_sector_trailer_by_sector(data, cfg.data_sector);
+
+        const uint64_t key_a =
+            bit_lib_bytes_to_num_be(sec_tr->key_a.data, COUNT_OF(sec_tr->key_a.data));
+        const uint64_t key_b =
+            bit_lib_bytes_to_num_be(sec_tr->key_b.data, COUNT_OF(sec_tr->key_b.data));
+        if((key_a != cfg.keys[cfg.data_sector].a) || (key_b != cfg.keys[cfg.data_sector].b)) break;
+
+        uint32_t card_code = bit_lib_get_bits_32(data->block[60].data, 8, 24);
+        uint8_t card_region = bit_lib_get_bits(data->block[60].data, 32, 8);
+        uint64_t card_number = bit_lib_get_bits_64(data->block[60].data, 40, 40);
+        uint8_t card_control = bit_lib_get_bits(data->block[60].data, 80, 4);
+        uint64_t omc_number = bit_lib_get_bits_64(data->block[21].data, 8, 64);
+        uint8_t year = data->block[60].data[11];
+        uint8_t month = data->block[60].data[12];
+
+        uint64_t number = hex_num(card_control) + hex_num(card_number) * 10 +
+                          hex_num(card_region) * 10 * 10000000000 +
+                          hex_num(card_code) * 10 * 10000000000 * 100;
+
+        uint8_t luhn = calculate_luhn(number);
+        if(luhn != card_control) break;
+
+        FuriString* metro_result = furi_string_alloc();
+        FuriString* ground_result = furi_string_alloc();
+        bool is_metro_data_present =
+            mosgortrans_parse_transport_block(&data->block[4], metro_result);
+        bool is_ground_data_present =
+            mosgortrans_parse_transport_block(&data->block[16], ground_result);
+        furi_string_cat_printf(
+            parsed_data,
+            "\e#Social \ecard\nNumber: %lx %x %llx %x\nOMC: %llx\nValid for: %02x/%02x %02x%02x\n",
+            card_code,
+            card_region,
+            card_number,
+            card_control,
+            omc_number,
+            month,
+            year,
+            data->block[60].data[13],
+            data->block[60].data[14]);
+        if(is_metro_data_present && !furi_string_empty(metro_result)) {
+            render_section_header(parsed_data, "Metro", 22, 21);
+            furi_string_cat_printf(parsed_data, "%s\n", furi_string_get_cstr(metro_result));
+        }
+        if(is_ground_data_present && !furi_string_empty(ground_result)) {
+            render_section_header(parsed_data, "Ground", 21, 20);
+            furi_string_cat_printf(parsed_data, "%s\n", furi_string_get_cstr(ground_result));
+        }
+        furi_string_free(ground_result);
+        furi_string_free(metro_result);
+        parsed = true;
+    } while(false);
+
+    return parsed;
+}
+
+/* Actual implementation of app<>plugin interface */
+static const NfcSupportedCardsPlugin social_moscow_plugin = {
+    .protocol = NfcProtocolMfClassic,
+    .verify = social_moscow_verify,
+    .read = social_moscow_read,
+    .parse = social_moscow_parse,
+};
+
+/* Plugin descriptor to comply with basic plugin specification */
+static const FlipperAppPluginDescriptor social_moscow_plugin_descriptor = {
+    .appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
+    .ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
+    .entry_point = &social_moscow_plugin,
+};
+
+/* Plugin entry point - must return a pointer to const descriptor  */
+const FlipperAppPluginDescriptor* social_moscow_plugin_ep() {
+    return &social_moscow_plugin_descriptor;
+}