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47LeCoste
2023-12-09 13:32:16 +01:00
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parent 845add5f15
commit d47bbfeef3
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applications/main/nfc/plugins/supported_cards/microel.c Normal file
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#include "nfc_supported_card_plugin.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>
#include <stdint.h>
#define TAG "Microel"
#define KEY_LENGTH 6
#define UID_LENGTH 4
typedef struct {
uint64_t a;
uint64_t b;
} MfClassicKeyPair;
static MfClassicKeyPair microel_1k_keys[] = {
{.a = 0x000000000000, .b = 0x000000000000}, // 000
{.a = 0x000000000000, .b = 0x000000000000}, // 001
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 002
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 003
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 004
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 005
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 006
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 007
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 008
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 009
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 010
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 011
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 012
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 013
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 014
{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 015
};
const uint8_t verify_sector = 1;
void calcolaSommaHex(const uint8_t *uid, size_t uidSize, uint8_t sommaHex[]) {
const uint8_t xorKey[] = { 0x01, 0x92, 0xA7, 0x75, 0x2B, 0xF9 };
int somma = 0;
for (size_t i = 0; i < uidSize; i++) {
somma += uid[i];
}
int sommaDueNumeri = somma % 256;
for (size_t i = 0; i < sizeof(xorKey); i++) {
sommaHex[i] = sommaDueNumeri ^ xorKey[i];
}
}
void generateKeyA(const uint8_t *uid, uint8_t uidSize, uint8_t keyA[]) {
uint8_t sommaHex[6];
calcolaSommaHex(uid, uidSize, sommaHex);
uint8_t primoCarattere = (sommaHex[0] >> 4) & 0xF;
if (primoCarattere == 0x2 || primoCarattere == 0x3 || primoCarattere == 0xA || primoCarattere == 0xB) {
// XOR WITH 0x40
for (size_t i = 0; i < sizeof(sommaHex); i++) {
keyA[i] = 0x40 ^ sommaHex[i];
}
} else if (primoCarattere == 0x6 || primoCarattere == 0x7 || primoCarattere == 0xE || primoCarattere == 0xF) {
// XOR WITH 0xC0
for (size_t i = 0; i < sizeof(sommaHex); i++) {
keyA[i] = 0xC0 ^ sommaHex[i];
}
}
}
void generateKeyB(uint8_t keyA[], size_t keyASize, uint8_t keyB[]) {
for (size_t i = 0; i < keyASize; i++) {
keyB[i] = 0xFF ^ keyA[i];
}
}
/*static bool microel_verify(Nfc* nfc) {
furi_assert(nfc);
bool verified = false;
do {
uint8_t block_num = mf_classic_get_first_block_num_of_sector(verify_sector);
FURI_LOG_D(TAG, "Verifying sector %u", verify_sector);
uint8_t uid[UID_LENGTH] = {0xd4, 0x23, 0xb7, 0x34};
size_t uid_len;
const uint8_t* uidn = mf_classic_get_uid(data, &uid_len);
FURI_LOG_D(TAG, "Microel provadiocane: UID identified: %02X%02X%02X%02X", uidn[0], uidn[1], uidn[2], uidn[3]);
if(uid_len != UID_LENGTH) break;
size_t uid_len = 0;
const uint8_t* originalUid = mf_classic_get_uid(data, &uid_len);
uint8_t uid[UID_LENGTH]; // Sostituisci UID_LENGTH con la lunghezza effettiva dell'UID
memcpy(uid, originalUid, UID_LENGTH);
FURI_LOG_D(TAG, "UID: %02X %02X %02X %02X", uid[0],uid[1],uid[2],uid[3]);
FURI_LOG_D(TAG, "UID GET: %02X %02X %02X %02X", originalUid[0],originalUid[1],originalUid[2],originalUid[3]);
//memcpy(uid, data->iso14443_3a_data->uid, UID_LENGTH);
// Generate key from uid
uint8_t keyA[KEY_LENGTH];
generateKeyA(uid, UID_LENGTH, keyA);
MfClassicKey key = {};
memcpy(key.data, keyA, KEY_LENGTH);
MfClassicAuthContext auth_ctx = {};
MfClassicError error =
mf_classic_poller_sync_auth(nfc, block_num, &key, MfClassicKeyTypeA, &auth_ctx);
if(error != MfClassicErrorNone) {
verified = false;
FURI_LOG_D(TAG, "Failed to read block %u: %d", block_num, error);
break;
}
verified = true;
} while(false);
return verified;
}*/
static bool microel_read(Nfc* nfc, NfcDevice* device) {
FURI_LOG_D(TAG, "Entering Microel KDF");
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 = MfClassicType1k;
MfClassicError error = mf_classic_poller_sync_detect_type(nfc, &type);
if(error != MfClassicErrorNone) break;
size_t uid_len;
const uint8_t* uid = mf_classic_get_uid(data, &uid_len);
FURI_LOG_D(TAG, "UID identified: %02X%02X%02X%02X", uid[0], uid[1], uid[2], uid[3]);
if(uid_len != UID_LENGTH) break;
uint8_t keyA[KEY_LENGTH];
uint8_t keyB[KEY_LENGTH];
generateKeyA(uid, UID_LENGTH, keyA);
generateKeyB(keyA, KEY_LENGTH, keyB);
for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
if(microel_1k_keys[i].a == 0x000000000000) {
microel_1k_keys[i].a = nfc_util_bytes2num(keyA, KEY_LENGTH);
}
if(microel_1k_keys[i].b == 0x000000000000) {
microel_1k_keys[i].b = nfc_util_bytes2num(keyB, KEY_LENGTH);
}
}
MfClassicDeviceKeys keys = {};
for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
nfc_util_num2bytes(microel_1k_keys[i].a, sizeof(MfClassicKey), keys.key_a[i].data);
FURI_BIT_SET(keys.key_a_mask, i);
nfc_util_num2bytes(microel_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 microel_parse(const NfcDevice* device, FuriString* parsed_data) {
furi_assert(device);
furi_assert(parsed_data);
const MfClassicData* data = nfc_device_get_data(device, NfcProtocolMfClassic);
bool parsed = false;
do {
//Get UID
size_t uid_len;
const uint8_t* uid = mf_classic_get_uid(data, &uid_len);
if(uid_len != UID_LENGTH) break;
// Generate key from uid
uint8_t keyA[KEY_LENGTH];
generateKeyA(uid, UID_LENGTH, keyA);
// Verify key
MfClassicSectorTrailer* sec_tr = mf_classic_get_sector_trailer_by_sector(data, verify_sector);
uint64_t key = nfc_util_bytes2num(sec_tr->key_a.data, 6);
uint64_t key_for_check_from_array = nfc_util_bytes2num(keyA, KEY_LENGTH);
if(key != key_for_check_from_array) return false;
//Get credit in block number 8
const uint8_t* temp_ptr = data->block[4].data;
uint16_t balance = (temp_ptr[6] << 8) | (temp_ptr[5]);
uint16_t previus_balance = (data->block[5].data[6] << 8) | (data->block[5].data[5]);
furi_string_cat_printf(parsed_data, "\e#Microel Card\n");
furi_string_cat_printf(parsed_data, "UID:");
for(size_t i = 0; i < UID_LENGTH; i++) {
furi_string_cat_printf(parsed_data, " %02X", uid[i]);
}
furi_string_cat_printf(parsed_data, "\nCurrent Credit: %d.%02d E \n", balance / 100, balance % 100);
furi_string_cat_printf(parsed_data, "Previus Credit: %d.%02d E \n", previus_balance / 100, previus_balance % 100);
parsed = true;
} while(false);
return parsed;
}
/* Actual implementation of app<>plugin interface */
static const NfcSupportedCardsPlugin microel_plugin = {
.protocol = NfcProtocolMfClassic,
.verify = NULL, // the verification I need is based on verifying the keys generated via uid and try to authenticate not like on mizip that there is default b0
.read = microel_read,
.parse = microel_parse,
};
/* Plugin descriptor to comply with basic plugin specification */
static const FlipperAppPluginDescriptor microel_plugin_descriptor = {
.appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
.ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
.entry_point = &microel_plugin,
};
/* Plugin entry point - must return a pointer to const descriptor */
const FlipperAppPluginDescriptor* microel_plugin_ep() {
return &microel_plugin_descriptor;
}