[FL-2245] Introduce Mifare Classic Emulation (#1242)

* digital signal: introduce digital signal
* nfca: add nfca signal encoder
* nfc: add mifare classic emulation scene
* nfca: add classic emulation support to lib and hal
* mifare classic: support basic read commands
* nfc: add mifare classic menu scene
* mifare classic: start parsing commands in emulation
* mifare classic: add nested auth
* nfc: fix errors
* mifare classic: add encrypt function
* nfc: fix mifare classic save
* lib hex: add hex uint64_t ASCII parser
* flipper format: add uint64 hex format support
* nfc: add mifare classic key map
* nfc: hide mifare classic keys on emulation
* mifare classic: add NACK responce
* nfc: add partial bytes support in transparent mode
* nfc: mifare classic add shadow file support
* digital signal: move arr buffer from BSS to heap
* mifare classic: process access bits more careful
* nfca: fix memory leack
* nfc: format sources
* mifare classic: cleun up

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

1 files changed, 31 insertions, 0 deletions

diff --git a/applications/nfc/nfc_worker.c b/applications/nfc/nfc_worker.c
index 6b3c8f09..5ae99d6d 100644
--- a/applications/nfc/nfc_worker.c
+++ b/applications/nfc/nfc_worker.c
@@ -7,6 +7,7 @@
 #include <lib/nfc_protocols/mifare_ultralight.h>
 #include <lib/nfc_protocols/mifare_classic.h>
 #include <lib/nfc_protocols/mifare_desfire.h>
+#include <lib/nfc_protocols/nfca.h>
 
 #include "helpers/nfc_mf_classic_dict.h"
 
@@ -104,6 +105,8 @@ int32_t nfc_worker_task(void* context) {
         nfc_worker_emulate_mifare_ul(nfc_worker);
     } else if(nfc_worker->state == NfcWorkerStateReadMifareClassic) {
         nfc_worker_mifare_classic_dict_attack(nfc_worker);
+    } else if(nfc_worker->state == NfcWorkerStateEmulateMifareClassic) {
+        nfc_worker_emulate_mifare_classic(nfc_worker);
     } else if(nfc_worker->state == NfcWorkerStateReadMifareDesfire) {
         nfc_worker_read_mifare_desfire(nfc_worker);
     }
@@ -474,6 +477,34 @@ void nfc_worker_mifare_classic_dict_attack(NfcWorker* nfc_worker) {
     stream_free(nfc_worker->dict_stream);
 }
 
+void nfc_worker_emulate_mifare_classic(NfcWorker* nfc_worker) {
+    FuriHalNfcTxRxContext tx_rx;
+    FuriHalNfcDevData* nfc_data = &nfc_worker->dev_data->nfc_data;
+    MfClassicEmulator emulator = {
+        .cuid = nfc_util_bytes2num(&nfc_data->uid[nfc_data->uid_len - 4], 4),
+        .data = nfc_worker->dev_data->mf_classic_data,
+        .data_changed = false,
+    };
+    NfcaSignal* nfca_signal = nfca_signal_alloc();
+    tx_rx.nfca_signal = nfca_signal;
+
+    while(nfc_worker->state == NfcWorkerStateEmulateMifareClassic) {
+        if(furi_hal_nfc_listen(
+               nfc_data->uid, nfc_data->uid_len, nfc_data->atqa, nfc_data->sak, true, 300)) {
+            mf_classic_emulator(&emulator, &tx_rx);
+        }
+    }
+    if(emulator.data_changed) {
+        nfc_worker->dev_data->mf_classic_data = emulator.data;
+        if(nfc_worker->callback) {
+            nfc_worker->callback(NfcWorkerEventSuccess, nfc_worker->context);
+        }
+        emulator.data_changed = false;
+    }
+
+    nfca_signal_free(nfca_signal);
+}
+
 void nfc_worker_read_mifare_desfire(NfcWorker* nfc_worker) {
     ReturnCode err;
     uint8_t tx_buff[64] = {};