mirror of
https://github.com/DarkFlippers/unleashed-firmware.git
synced 2024-12-23 05:14:16 +03:00
175 lines
6.6 KiB
C
175 lines
6.6 KiB
C
// From: https://gitee.com/jadenwu/Saflok_KDF/blob/master/saflok.c
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// KDF published and reverse engineered by Jaden Wu
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// FZ plugin by @noproto
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#include "nfc_supported_card_plugin.h"
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#include <flipper_application/flipper_application.h>
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#include <nfc/nfc_device.h>
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#include <nfc/helpers/nfc_util.h>
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#include <nfc/protocols/mf_classic/mf_classic_poller_sync.h>
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#include <stdint.h>
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#define TAG "Saflok"
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#define MAGIC_TABLE_SIZE 192
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#define KEY_LENGTH 6
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#define UID_LENGTH 4
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#define CHECK_SECTOR 1
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typedef struct {
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uint64_t a;
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uint64_t b;
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} MfClassicKeyPair;
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static MfClassicKeyPair saflok_1k_keys[] = {
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 000
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{.a = 0x2a2c13cc242a, .b = 0xffffffffffff}, // 001
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{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 002
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{.a = 0xffffffffffff, .b = 0xffffffffffff}, // 003
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 004
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 005
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 006
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 007
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 008
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 009
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 010
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 011
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 012
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 013
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 014
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{.a = 0x000000000000, .b = 0xffffffffffff}, // 015
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};
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void generate_saflok_key(const uint8_t* uid, uint8_t* key) {
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static const uint8_t magic_table[MAGIC_TABLE_SIZE] = {
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0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0xF0, 0x57, 0xB3, 0x9E, 0xE3, 0xD8, 0x00, 0x00, 0xAA,
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0x00, 0x00, 0x00, 0x96, 0x9D, 0x95, 0x4A, 0xC1, 0x57, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00,
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0x8F, 0x43, 0x58, 0x0D, 0x2C, 0x9D, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0xFF, 0xCC, 0xE0,
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0x05, 0x0C, 0x43, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x34, 0x1B, 0x15, 0xA6, 0x90, 0xCC,
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0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x89, 0x58, 0x56, 0x12, 0xE7, 0x1B, 0x00, 0x00, 0xAA,
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0x00, 0x00, 0x00, 0xBB, 0x74, 0xB0, 0x95, 0x36, 0x58, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00,
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0xFB, 0x97, 0xF8, 0x4B, 0x5B, 0x74, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0xC9, 0xD1, 0x88,
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0x35, 0x9F, 0x92, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x8F, 0x92, 0xE9, 0x7F, 0x58, 0x97,
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0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x16, 0x6C, 0xA2, 0xB0, 0x9F, 0xD1, 0x00, 0x00, 0xAA,
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0x00, 0x00, 0x00, 0x27, 0xDD, 0x93, 0x10, 0x1C, 0x6C, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00,
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0xDA, 0x3E, 0x3F, 0xD6, 0x49, 0xDD, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x58, 0xDD, 0xED,
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0x07, 0x8E, 0x3E, 0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x5C, 0xD0, 0x05, 0xCF, 0xD9, 0x07,
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0x00, 0x00, 0xAA, 0x00, 0x00, 0x00, 0x11, 0x8D, 0xD0, 0x01, 0x87, 0xD0};
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uint8_t magic_byte = (uid[3] >> 4) + (uid[2] >> 4) + (uid[0] & 0x0F);
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uint8_t magickal_index = (magic_byte & 0x0F) * 12 + 11;
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uint8_t temp_key[KEY_LENGTH] = {magic_byte, uid[0], uid[1], uid[2], uid[3], magic_byte};
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uint8_t carry_sum = 0;
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for(int i = KEY_LENGTH - 1; i >= 0; i--, magickal_index--) {
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uint16_t keysum = temp_key[i] + magic_table[magickal_index];
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temp_key[i] = (keysum & 0xFF) + carry_sum;
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carry_sum = keysum >> 8;
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}
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memcpy(key, temp_key, KEY_LENGTH);
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}
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static bool saflok_verify(Nfc* nfc) {
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bool verified = false;
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do {
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const uint8_t block_num = mf_classic_get_first_block_num_of_sector(CHECK_SECTOR);
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FURI_LOG_D(TAG, "Saflok: Verifying sector %i", CHECK_SECTOR);
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MfClassicKey key = {0};
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nfc_util_num2bytes(saflok_1k_keys[CHECK_SECTOR].a, COUNT_OF(key.data), key.data);
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MfClassicAuthContext auth_context;
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MfClassicError error =
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mf_classic_poller_sync_auth(nfc, block_num, &key, MfClassicKeyTypeA, &auth_context);
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if(error != MfClassicErrorNone) {
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FURI_LOG_D(TAG, "Saflok: Failed to read block %u: %d", block_num, error);
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break;
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}
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verified = true;
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} while(false);
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return verified;
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}
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static bool saflok_read(Nfc* nfc, NfcDevice* device) {
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FURI_LOG_D(TAG, "Entering Saflok KDF");
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furi_assert(nfc);
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furi_assert(device);
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bool is_read = false;
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MfClassicData* data = mf_classic_alloc();
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nfc_device_copy_data(device, NfcProtocolMfClassic, data);
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do {
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MfClassicType type = MfClassicType1k;
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MfClassicError error = mf_classic_poller_sync_detect_type(nfc, &type);
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if(error != MfClassicErrorNone) break;
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data->type = type;
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size_t uid_len;
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const uint8_t* uid = mf_classic_get_uid(data, &uid_len);
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FURI_LOG_D(
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TAG, "Saflok: UID identified: %02X%02X%02X%02X", uid[0], uid[1], uid[2], uid[3]);
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if(uid_len != UID_LENGTH) break;
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uint8_t key[KEY_LENGTH];
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generate_saflok_key(uid, key);
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uint64_t num_key = nfc_util_bytes2num(key, KEY_LENGTH);
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FURI_LOG_D(TAG, "Saflok: Key generated for UID: %012llX", num_key);
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for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
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if(saflok_1k_keys[i].a == 0x000000000000) {
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saflok_1k_keys[i].a = num_key;
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}
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}
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MfClassicDeviceKeys keys = {};
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for(size_t i = 0; i < mf_classic_get_total_sectors_num(data->type); i++) {
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nfc_util_num2bytes(saflok_1k_keys[i].a, sizeof(MfClassicKey), keys.key_a[i].data);
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FURI_BIT_SET(keys.key_a_mask, i);
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nfc_util_num2bytes(saflok_1k_keys[i].b, sizeof(MfClassicKey), keys.key_b[i].data);
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FURI_BIT_SET(keys.key_b_mask, i);
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}
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error = mf_classic_poller_sync_read(nfc, &keys, data);
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if(error != MfClassicErrorNone) {
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FURI_LOG_W(TAG, "Failed to read data");
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break;
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}
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nfc_device_set_data(device, NfcProtocolMfClassic, data);
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is_read = true;
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} while(false);
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mf_classic_free(data);
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return is_read;
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}
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/* Actual implementation of app<>plugin interface */
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static const NfcSupportedCardsPlugin saflok_plugin = {
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.protocol = NfcProtocolMfClassic,
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.verify = saflok_verify,
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.read = saflok_read,
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// KDF mode
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.parse = NULL,
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};
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/* Plugin descriptor to comply with basic plugin specification */
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static const FlipperAppPluginDescriptor saflok_plugin_descriptor = {
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.appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
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.ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
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.entry_point = &saflok_plugin,
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};
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/* Plugin entry point - must return a pointer to const descriptor */
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const FlipperAppPluginDescriptor* saflok_plugin_ep() {
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return &saflok_plugin_descriptor;
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}
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