Merge pull request #683 from yaba/nfc-washcity

Added plugin to read WashCity card balance

applications/main/nfc/application.fam

@@ -155,6 +155,15 @@ App(
     sources=["plugins/supported_cards/hid.c"],
 )
 
+App(
+    appid="washcity_parser",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="washcity_plugin_ep",
+    targets=["f7"],
+    requires=["nfc"],
+    sources=["plugins/supported_cards/washcity.c"],
+)
+
 App(
     appid="nfc_start",
     targets=["f7"],

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

@@ -0,0 +1,193 @@
+/*
+ * Parser for WashCity MarkItaly Card (Europe).
+ *
+ * Copyright 2023 Filipe Polido (YaBaPT) <[email protected]>
+ * 
+ * Based on MetroMoney by Leptoptilos <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "nfc_supported_card_plugin.h"
+
+#include "protocols/mf_classic/mf_classic.h"
+#include <flipper_application/flipper_application.h>
+
+#include <nfc/nfc_device.h>
+#include <nfc/helpers/nfc_util.h>
+#include <nfc/protocols/mf_classic/mf_classic_poller_sync.h>
+
+#define TAG "WashCity"
+
+typedef struct {
+    uint64_t a;
+    uint64_t b;
+} MfClassicKeyPair;
+
+static const MfClassicKeyPair washcity_1k_keys[] = {
+    {.a = 0xA0A1A2A3A4A5, .b = 0x010155010100}, // Sector 00
+    {.a = 0xC78A3D0E1BCD, .b = 0xFFFFFFFFFFFF}, // Sector 01
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 02
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 03
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 04
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 05
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 06
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 07
+    {.a = 0xC78A3D0E0000, .b = 0xFFFFFFFFFFFF}, // Sector 08
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 09
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 10
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 11
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 12
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 13
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 14
+    {.a = 0x010155010100, .b = 0xFFFFFFFFFFFF}, // Sector 15
+};
+
+static bool washcity_verify(Nfc* nfc) {
+    bool verified = false;
+
+    do {
+        const uint8_t ticket_sector_number = 0;
+        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};
+        nfc_util_num2bytes(washcity_1k_keys[ticket_sector_number].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 washcity_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 = MfClassicTypeMini;
+        MfClassicError error = mf_classic_poller_sync_detect_type(nfc, &type);
+        if(error != MfClassicErrorNone) break;
+
+        data->type = type;
+        if(type != MfClassicType1k) break;
+
+        MfClassicDeviceKeys keys = {
+            .key_a_mask = 0,
+            .key_b_mask = 0,
+        };
+        for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
+            nfc_util_num2bytes(washcity_1k_keys[i].a, sizeof(MfClassicKey), keys.key_a[i].data);
+            FURI_BIT_SET(keys.key_a_mask, i);
+            nfc_util_num2bytes(washcity_1k_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 != MfClassicErrorNone) {
+            FURI_LOG_W(TAG, "Failed to read data");
+            break;
+        }
+
+        nfc_device_set_data(device, NfcProtocolMfClassic, data);
+
+        is_read = true;
+    } while(false);
+
+    mf_classic_free(data);
+
+    return is_read;
+}
+
+static bool washcity_parse(const NfcDevice* device, FuriString* parsed_data) {
+    furi_assert(device);
+
+    const MfClassicData* data = nfc_device_get_data(device, NfcProtocolMfClassic);
+
+    bool parsed = false;
+
+    do {
+        // Verify key
+        const uint8_t ticket_sector_number = 1;
+        const uint8_t ticket_block_number = 0;
+
+        const MfClassicSectorTrailer* sec_tr =
+            mf_classic_get_sector_trailer_by_sector(data, ticket_sector_number);
+
+        const uint64_t key = nfc_util_bytes2num(sec_tr->key_a.data, COUNT_OF(sec_tr->key_a.data));
+        if(key != washcity_1k_keys[ticket_sector_number].a) break;
+
+        // Parse data
+        const uint8_t start_block_num =
+            mf_classic_get_first_block_num_of_sector(ticket_sector_number);
+
+        const uint8_t* block_start_ptr =
+            &data->block[start_block_num + ticket_block_number].data[0];
+
+        uint32_t balance = nfc_util_bytes2num(block_start_ptr + 2, 2);
+
+        uint32_t balance_usd = balance / 100;
+        uint8_t balance_cents = balance % 100;
+
+        size_t uid_len = 0;
+        const uint8_t* uid = mf_classic_get_uid(data, &uid_len);
+
+        // Card Number is printed in HEX (equal to UID)
+        uint64_t card_number = nfc_util_bytes2num(uid, uid_len);
+
+        furi_string_printf(
+            parsed_data,
+            "\e#WashCity\nCard number: %0*llX\nBalance: %lu.%02u USD",
+            uid_len * 2,
+            card_number,
+            balance_usd,
+            balance_cents);
+        parsed = true;
+    } while(false);
+
+    return parsed;
+}
+
+/* Actual implementation of app<>plugin interface */
+static const NfcSupportedCardsPlugin washcity_plugin = {
+    .protocol = NfcProtocolMfClassic,
+    .verify = washcity_verify,
+    .read = washcity_read,
+    .parse = washcity_parse,
+};
+
+/* Plugin descriptor to comply with basic plugin specification */
+static const FlipperAppPluginDescriptor washcity_plugin_descriptor = {
+    .appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
+    .ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
+    .entry_point = &washcity_plugin,
+};
+
+/* Plugin entry point - must return a pointer to const descriptor  */
+const FlipperAppPluginDescriptor* washcity_plugin_ep() {
+    return &washcity_plugin_descriptor;
+}