nfc: NTAG21x complete emulation (#1313)

* nfc: Refactor Mifare Ultralight feature flags
  Unify them in both reader and emulator to make handling easier
* nfc: Refactor MFUL PWD_AUTH and add AUTHLIM counter
* nfc: Add MFUL EV1 VCSL command emulation
* nfc: Enforce message size check in MFUL emulation
  Also fix READ_CNT byte order, but it's not fully working
* nfc: Add MFUL auth counter serialization
  Also fill counter on successful read from tag
* nfc: Fix MFUL INCR_CNT emulation
* nfc: Fix MFUL READ_CNT emulation
* nfc: Refactor MFUL emulation and implement full write support
* nfc: Fix Mifare Ultralight serialization
* nfc: Add MFUL OTP/CC handling
* nfc: Make sure MF0UL21 dynamic lock byte 3 also reads 0xBD
* nfc: Small MFUL refactor and fix CFGLCK behavior
* WIP: nfc: MFUL read support with ASCII mirror and auth roll-over
  This is too complex and I don't like it
* nfc: Simplify MFUL read emulation, fix mirror range check
* nfc: Implement MFUL auth and ASCII mirror for FAST_READ
* nfc: Fix MFUL read roll-over with AUTH0 set
* nfc: Implement MFUL read counter increment
* nfc: Align ASCII mirror to NTAG21x behavior
* nfc: Handle invalid command in MFUL emulation
* nfc: Fix MFUL static lock check
* nfc: Refactor MFUL emulation to use cached config pages
* nfc: Refactor MFUL auth counter to count up instead of down
* nfc: Add missing NULL check
* WIP: nfc: Various MFUL emulation behavior tweaks
* WIP: nfc: More MFUL emulation behavior adjustments
* nfc: Match AUTHLIM emulation to NTAG21x behavior
* nfc: Fix MFUL dynamic lock emulation
* nfc: Fix typo in MFUL read counters
* nfc: Fix typo in MFUL FAST_READ emulation
* nfc: Increase emulation TX buffer size
  Enough space for if someone requests FAST_READ of all pages of an NTAG
* nfc: Fix MFUL negative verification counter overflow
* nfc: Change auth counter kv name
* nfc: Fix NTAG I2C FAST_READ emulation
* nfc: Fix NTAG21x config reload behavior

Co-authored-by: あく <alleteam@gmail.com>

applications/nfc/nfc_device.c

@@ -120,6 +120,12 @@ static bool nfc_device_save_mifare_ul_data(FlipperFormat* file, NfcDevice* dev)
             }
         }
         if(!pages_saved) break;
+
+        // Write authentication counter
+        uint32_t auth_counter = data->curr_authlim;
+        if(!flipper_format_write_uint32(file, "Failed authentication attempts", &auth_counter, 1))
+            break;
+
         saved = true;
     } while(false);
 
@@ -169,6 +175,12 @@ bool nfc_device_load_mifare_ul_data(FlipperFormat* file, NfcDevice* dev) {
             }
         }
         if(!pages_parsed) break;
+
+        // Read authentication counter
+        uint32_t auth_counter;
+        if(!flipper_format_read_uint32(file, "Failed authentication attempts", &auth_counter, 1))
+            auth_counter = 0;
+
         parsed = true;
     } while(false);
 

applications/nfc/nfc_worker.c

@@ -319,11 +319,7 @@ void nfc_worker_emulate_mifare_ul(NfcWorker* nfc_worker) {
     MfUltralightEmulator emulator = {};
     mf_ul_prepare_emulation(&emulator, &nfc_worker->dev_data->mf_ul_data);
     while(nfc_worker->state == NfcWorkerStateEmulateMifareUltralight) {
-        emulator.auth_success = false;
-        if(emulator.data.type >= MfUltralightTypeNTAGI2C1K) {
-            // Sector index needs to be reset
-            emulator.curr_sector = 0;
-        }
+        mf_ul_reset_emulation(&emulator, true);
         furi_hal_nfc_emulate_nfca(
             nfc_data->uid,
             nfc_data->uid_len,

firmware/targets/f7/furi_hal/furi_hal_nfc.c

@@ -277,7 +277,7 @@ bool furi_hal_nfc_emulate_nfca(
     uint8_t buff_rx[256];
     uint16_t buff_rx_size = 256;
     uint16_t buff_rx_len = 0;
-    uint8_t buff_tx[256];
+    uint8_t buff_tx[1040];
     uint16_t buff_tx_len = 0;
     uint32_t data_type = FURI_HAL_NFC_TXRX_DEFAULT;