Added mykey (#467)

applications/main/nfc/helpers/protocol_support/st25tb/mykey.c

@@ -0,0 +1,48 @@
+#include "mykey.h"
+
+uint32_t encode_decode_block(uint32_t input) {
+        /*
+     * Swap all values using XOR
+     * 32 bit: 1111222233334444
+     */
+    input ^= (input & 0x00C00000) << 6 | (input & 0x0000C000) << 12 | (input & 0x000000C0) << 18 |
+             (input & 0x000C0000) >> 6 | (input & 0x00030000) >> 12 | (input & 0x00000300) >> 6;
+    input ^= (input & 0x30000000) >> 6 | (input & 0x0C000000) >> 12 | (input & 0x03000000) >> 18 |
+             (input & 0x00003000) << 6 | (input & 0x00000030) << 12 | (input & 0x0000000C) << 6;
+    input ^= (input & 0x00C00000) << 6 | (input & 0x0000C000) << 12 | (input & 0x000000C0) << 18 |
+             (input & 0x000C0000) >> 6 | (input & 0x00030000) >> 12 | (input & 0x00000300) >> 6;
+    return input;
+}
+
+
+
+void endian_swap_uint8_array(uint8_t *array, size_t size) {
+    size_t i;
+    uint8_t temp;
+
+    for (i = 0; i < size / 2; i++) {
+        temp = array[i];
+        array[i] = array[size - 1 - i];
+        array[size - 1 - i] = temp;
+    }
+}
+
+/* Bytewise LITTLE ENDIAN */
+uint32_t st25tb_get_block_value(uint32_t block) {
+    uint8_t byte0 = (block >> 24) & 0xFF;
+    uint8_t byte1 = (block >> 16) & 0xFF;
+    uint8_t byte2 = (block >> 8) & 0xFF;
+    uint8_t byte3 = block & 0xFF;
+
+    return (byte3 << 24) | (byte2 << 16) | (byte1 << 8) | byte0;
+}
+
+//Ottengo il blocco effetto un bytewise e lo decodo
+uint32_t get_block(uint32_t block) {
+    return encode_decode_block(st25tb_get_block_value(block));
+}
+
+//decode for credit 
+uint32_t get_xored_block(uint32_t block, uint32_t key) {
+    return encode_decode_block(st25tb_get_block_value(block) ^ key);
+}

applications/main/nfc/helpers/protocol_support/st25tb/mykey.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <nfc/protocols/st25tb/st25tb.h>
+
+enum {
+    MYKEY_BLOCK_KEY_ID = 0x07,
+    MYKEY_BLOCK_PRODUCTION_DATE = 0x08,
+    MYKEY_BLOCK_VENDOR_ID_1 = 0x18,
+    MYKEY_BLOCK_VENDOR_ID_2 = 0x19,
+    MYKEY_BLOCK_CURRENT_CREDIT = 0x21,
+    MYKEY_BLOCK_PREVIOUS_CREDIT = 0x23,
+    MYKEY_DEFAULT_VENDOR_ID = 0xFEDC0123,
+    MYKEY_DEFAULT_VENDOR_ID_1 = 0xFEDC,
+    MYKEY_DEFAULT_VENDOR_ID_2 = 0x0123,
+};
+
+typedef enum {
+    LockIdStatusNone,
+    LockIdStatusActive,
+} LockIdStatus;
+
+#define get_uid(uid) ((uid)[7] | ((uid)[6] << 8) | ((uid)[5] << 16) | ((uid)[4] << 24))
+#define new_get_count_down_counter(b6) (~(b6 << 24 | (b6 & 0x0000FF00) << 8 | (b6 & 0x00FF0000) >> 8 | b6 >> 24))
+#define get_vendor(b1, b2) (get_block(b1) << 16 | (get_block(b2) & 0x0000FFFF))
+#define get_master_key(uid, vendor_id) ((uid) * ((vendor_id) + 1))
+#define get_is_bound(vendor_id) ((vendor_id) != MYKEY_DEFAULT_VENDOR_ID)
+#define get_encryption_key(master_key, count_down_counter)((master_key) * ((count_down_counter) + 1))
+
+uint32_t encode_decode_block(uint32_t input);
+uint32_t st25tb_get_block_value(uint32_t block);
+uint32_t get_block(uint32_t block);
+uint32_t get_xored_block(uint32_t block, uint32_t key);

applications/main/nfc/helpers/protocol_support/st25tb/st25tb_render.c

@@ -1,22 +1,40 @@
 #include "st25tb_render.h"
 #include <nfc/protocols/st25tb/st25tb.h>
+#include "mykey.h"
 
 void nfc_render_st25tb_info(
     const St25tbData* data,
     NfcProtocolFormatType format_type,
     FuriString* str) {
-    furi_string_cat_printf(str, "UID");
-
-    for(size_t i = 0; i < ST25TB_UID_SIZE; i++) {
+    furi_string_cat_printf(str, "UID:");
+    for(size_t i = 0; i < 8; i++) {
         furi_string_cat_printf(str, " %02X", data->uid[i]);
     }
 
+    uint32_t _uid = get_uid(data->uid);
+    uint32_t _count_down_counter_new = new_get_count_down_counter(st25tb_get_block_value(data->blocks[6]));
+    uint32_t _vendor_id = get_vendor(data->blocks[MYKEY_BLOCK_VENDOR_ID_1], data->blocks[MYKEY_BLOCK_VENDOR_ID_2]);
+    uint32_t _master_key = get_master_key(_uid, _vendor_id);
+    uint32_t _encryption_key = get_encryption_key(_master_key, _count_down_counter_new);
+    uint16_t credit = get_xored_block(data->blocks[MYKEY_BLOCK_CURRENT_CREDIT], _encryption_key);
+    uint16_t _previous_credit = get_block(data->blocks[MYKEY_BLOCK_PREVIOUS_CREDIT]);
+    bool _is_bound = get_is_bound(_vendor_id);
+    furi_string_cat_printf(str, "\nCurrent Credit: %d.%02d E", credit / 100, credit % 100);
+    furi_string_cat_printf(str, "\nPrevius Credit: %d.%02d E", _previous_credit / 100, _previous_credit % 100);
+    furi_string_cat_printf(str, "\nIs Bound: %s \n", _is_bound ? "Yes" : "No");
+
     if(format_type == NfcProtocolFormatTypeFull) {
-        furi_string_cat_printf(str, "\nSys. OTP: %08lX", data->system_otp_block);
+        //info data
+        furi_string_cat_printf(str, "UID: %08lX\n", _uid);
+        furi_string_cat_printf(str, "ID: %08lX\n", st25tb_get_block_value(data->blocks[7]));
+        furi_string_cat_printf(str, "\nCounter New: %08lX", _count_down_counter_new);
+        furi_string_cat_printf(str, "\nVendor ID: %08lX", _vendor_id);
+        furi_string_cat_printf(str, "\nMaster Key: %08lX", _master_key);
+        furi_string_cat_printf(str, "\nEncryption Key: %08lX", _encryption_key);
         furi_string_cat_printf(str, "\nBlocks:");
         for(size_t i = 0; i < st25tb_get_block_count(data->type); i += 2) {
             furi_string_cat_printf(
-                str, "\n %02X   %08lX  %08lX", i, data->blocks[i], data->blocks[i + 1]);
+                str, "\n %02X   %08lX  %08lX", i, st25tb_get_block_value(data->blocks[i]), st25tb_get_block_value(data->blocks[i + 1]));
         }
     }
 }