44426c7612
* [LRFID] Add support for Nexkey/Nexwatch * Update protocol_nexwatch.c: Remove unnecessary check Co-authored-by: SG <who.just.the.doctor@gmail.com> Co-authored-by: あく <alleteam@gmail.com>
324 lines
11 KiB
C
324 lines
11 KiB
C
#include <furi.h>
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#include <toolbox/protocols/protocol.h>
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#include <lfrfid/tools/bit_lib.h>
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#include "lfrfid_protocols.h"
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#define NEXWATCH_PREAMBLE_BIT_SIZE (8)
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#define NEXWATCH_PREAMBLE_DATA_SIZE (1)
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#define NEXWATCH_ENCODED_BIT_SIZE (96)
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#define NEXWATCH_ENCODED_DATA_SIZE ((NEXWATCH_ENCODED_BIT_SIZE) / 8)
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#define NEXWATCH_DECODED_BIT_SIZE (NEXWATCH_DECODED_DATA_SIZE * 8)
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#define NEXWATCH_DECODED_DATA_SIZE (8)
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#define NEXWATCH_US_PER_BIT (255)
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#define NEXWATCH_ENCODER_PULSES_PER_BIT (16)
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typedef struct {
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uint8_t magic;
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char desc[13];
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uint8_t chk;
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} ProtocolNexwatchMagic;
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ProtocolNexwatchMagic magic_items[] = {
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{0xBE, "Quadrakey", 0},
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{0x88, "Nexkey", 0},
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{0x86, "Honeywell", 0}};
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typedef struct {
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uint8_t data_index;
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uint8_t bit_clock_index;
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bool last_bit;
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bool current_polarity;
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bool pulse_phase;
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} ProtocolNexwatchEncoder;
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typedef struct {
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uint8_t encoded_data[NEXWATCH_ENCODED_DATA_SIZE];
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uint8_t negative_encoded_data[NEXWATCH_ENCODED_DATA_SIZE];
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uint8_t corrupted_encoded_data[NEXWATCH_ENCODED_DATA_SIZE];
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uint8_t corrupted_negative_encoded_data[NEXWATCH_ENCODED_DATA_SIZE];
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uint8_t data[NEXWATCH_DECODED_DATA_SIZE];
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ProtocolNexwatchEncoder encoder;
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} ProtocolNexwatch;
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ProtocolNexwatch* protocol_nexwatch_alloc(void) {
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ProtocolNexwatch* protocol = malloc(sizeof(ProtocolNexwatch));
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return protocol;
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};
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void protocol_nexwatch_free(ProtocolNexwatch* protocol) {
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free(protocol);
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};
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uint8_t* protocol_nexwatch_get_data(ProtocolNexwatch* protocol) {
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return protocol->data;
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};
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void protocol_nexwatch_decoder_start(ProtocolNexwatch* protocol) {
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memset(protocol->encoded_data, 0, NEXWATCH_ENCODED_DATA_SIZE);
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memset(protocol->negative_encoded_data, 0, NEXWATCH_ENCODED_DATA_SIZE);
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memset(protocol->corrupted_encoded_data, 0, NEXWATCH_ENCODED_DATA_SIZE);
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memset(protocol->corrupted_negative_encoded_data, 0, NEXWATCH_ENCODED_DATA_SIZE);
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};
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static bool protocol_nexwatch_check_preamble(uint8_t* data, size_t bit_index) {
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// 01010110
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if(bit_lib_get_bits(data, bit_index, 8) != 0b01010110) return false;
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return true;
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}
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static uint8_t protocol_nexwatch_parity_swap(uint8_t parity) {
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uint8_t a = (((parity >> 3) & 1));
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a |= (((parity >> 1) & 1) << 1);
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a |= (((parity >> 2) & 1) << 2);
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a |= ((parity & 1) << 3);
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return a;
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}
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static uint8_t protocol_nexwatch_parity(const uint8_t hexid[5]) {
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uint8_t p = 0;
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for(uint8_t i = 0; i < 5; i++) {
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p ^= ((hexid[i]) & 0xF0) >> 4;
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p ^= ((hexid[i]) & 0x0F);
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}
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return protocol_nexwatch_parity_swap(p);
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}
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static uint8_t protocol_nexwatch_checksum(uint8_t magic, uint32_t id, uint8_t parity) {
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uint8_t a = ((id >> 24) & 0xFF);
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a -= ((id >> 16) & 0xFF);
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a -= ((id >> 8) & 0xFF);
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a -= (id & 0xFF);
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a -= magic;
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a -= (bit_lib_reverse_8_fast(parity) >> 4);
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return bit_lib_reverse_8_fast(a);
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}
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static bool protocol_nexwatch_can_be_decoded(uint8_t* data) {
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if(!protocol_nexwatch_check_preamble(data, 0)) return false;
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// Check for reserved word (32-bit)
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if(bit_lib_get_bits_32(data, 8, 32) != 0) {
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return false;
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}
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uint8_t parity = bit_lib_get_bits(data, 76, 4);
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// parity check
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// from 32b hex id, 4b mode
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uint8_t hex[5] = {0};
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for(uint8_t i = 0; i < 5; i++) {
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hex[i] = bit_lib_get_bits(data, 40 + (i * 8), 8);
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}
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//mode is only 4 bits.
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hex[4] &= 0xf0;
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uint8_t calc_parity = protocol_nexwatch_parity(hex);
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if(calc_parity != parity) {
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return false;
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}
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return true;
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}
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static bool protocol_nexwatch_decoder_feed_internal(bool polarity, uint32_t time, uint8_t* data) {
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time += (NEXWATCH_US_PER_BIT / 2);
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size_t bit_count = (time / NEXWATCH_US_PER_BIT);
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bool result = false;
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if(bit_count < NEXWATCH_ENCODED_BIT_SIZE) {
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for(size_t i = 0; i < bit_count; i++) {
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bit_lib_push_bit(data, NEXWATCH_ENCODED_DATA_SIZE, polarity);
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if(protocol_nexwatch_can_be_decoded(data)) {
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result = true;
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break;
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}
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}
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}
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return result;
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}
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static void protocol_nexwatch_descramble(uint32_t* id, uint32_t* scrambled) {
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// 255 = Not used/Unknown other values are the bit offset in the ID/FC values
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const uint8_t hex_2_id[] = {31, 27, 23, 19, 15, 11, 7, 3, 30, 26, 22, 18, 14, 10, 6, 2,
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29, 25, 21, 17, 13, 9, 5, 1, 28, 24, 20, 16, 12, 8, 4, 0};
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*id = 0;
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for(uint8_t idx = 0; idx < 32; idx++) {
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bool bit_state = (*scrambled >> hex_2_id[idx]) & 1;
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*id |= (bit_state << (31 - idx));
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}
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}
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static void protocol_nexwatch_decoder_save(uint8_t* data_to, const uint8_t* data_from) {
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uint32_t id = bit_lib_get_bits_32(data_from, 40, 32);
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data_to[4] = (uint8_t)id;
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data_to[3] = (uint8_t)(id >>= 8);
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data_to[2] = (uint8_t)(id >>= 8);
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data_to[1] = (uint8_t)(id >>= 8);
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data_to[0] = (uint8_t)(id >>= 8);
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uint32_t check = bit_lib_get_bits_32(data_from, 72, 24);
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data_to[7] = (uint8_t)check;
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data_to[6] = (uint8_t)(check >>= 8);
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data_to[5] = (uint8_t)(check >>= 8);
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}
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bool protocol_nexwatch_decoder_feed(ProtocolNexwatch* protocol, bool level, uint32_t duration) {
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bool result = false;
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if(duration > (NEXWATCH_US_PER_BIT / 2)) {
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if(protocol_nexwatch_decoder_feed_internal(level, duration, protocol->encoded_data)) {
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protocol_nexwatch_decoder_save(protocol->data, protocol->encoded_data);
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result = true;
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return result;
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}
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if(protocol_nexwatch_decoder_feed_internal(
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!level, duration, protocol->negative_encoded_data)) {
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protocol_nexwatch_decoder_save(protocol->data, protocol->negative_encoded_data);
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result = true;
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return result;
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}
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}
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if(duration > (NEXWATCH_US_PER_BIT / 4)) {
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// Try to decode wrong phase synced data
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if(level) {
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duration += 120;
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} else {
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if(duration > 120) {
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duration -= 120;
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}
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}
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if(protocol_nexwatch_decoder_feed_internal(
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level, duration, protocol->corrupted_encoded_data)) {
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protocol_nexwatch_decoder_save(protocol->data, protocol->corrupted_encoded_data);
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result = true;
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return result;
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}
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if(protocol_nexwatch_decoder_feed_internal(
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!level, duration, protocol->corrupted_negative_encoded_data)) {
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protocol_nexwatch_decoder_save(
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protocol->data, protocol->corrupted_negative_encoded_data);
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result = true;
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return result;
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}
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}
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return result;
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};
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bool protocol_nexwatch_encoder_start(ProtocolNexwatch* protocol) {
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memset(protocol->encoded_data, 0, NEXWATCH_ENCODED_DATA_SIZE);
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*(uint32_t*)&protocol->encoded_data[0] = 0b00000000000000000000000001010110;
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bit_lib_copy_bits(protocol->encoded_data, 32, 32, protocol->data, 0);
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bit_lib_copy_bits(protocol->encoded_data, 64, 32, protocol->data, 32);
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protocol->encoder.last_bit =
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bit_lib_get_bit(protocol->encoded_data, NEXWATCH_ENCODED_BIT_SIZE - 1);
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protocol->encoder.data_index = 0;
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protocol->encoder.current_polarity = true;
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protocol->encoder.pulse_phase = true;
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protocol->encoder.bit_clock_index = 0;
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return true;
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};
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LevelDuration protocol_nexwatch_encoder_yield(ProtocolNexwatch* protocol) {
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LevelDuration level_duration;
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ProtocolNexwatchEncoder* encoder = &protocol->encoder;
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if(encoder->pulse_phase) {
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level_duration = level_duration_make(encoder->current_polarity, 1);
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encoder->pulse_phase = false;
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} else {
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level_duration = level_duration_make(!encoder->current_polarity, 1);
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encoder->pulse_phase = true;
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encoder->bit_clock_index++;
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if(encoder->bit_clock_index >= NEXWATCH_ENCODER_PULSES_PER_BIT) {
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encoder->bit_clock_index = 0;
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bool current_bit = bit_lib_get_bit(protocol->encoded_data, encoder->data_index);
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if(current_bit != encoder->last_bit) {
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encoder->current_polarity = !encoder->current_polarity;
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}
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encoder->last_bit = current_bit;
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bit_lib_increment_index(encoder->data_index, NEXWATCH_ENCODED_BIT_SIZE);
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}
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}
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return level_duration;
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};
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void protocol_nexwatch_render_data(ProtocolNexwatch* protocol, FuriString* result) {
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uint32_t id = 0;
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uint32_t scrambled = bit_lib_get_bits_32(protocol->data, 8, 32);
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protocol_nexwatch_descramble(&id, &scrambled);
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uint8_t m_idx;
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uint8_t mode = bit_lib_get_bits(protocol->data, 40, 4);
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uint8_t parity = bit_lib_get_bits(protocol->data, 44, 4);
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uint8_t chk = bit_lib_get_bits(protocol->data, 48, 8);
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for(m_idx = 0; m_idx < 3; m_idx++) {
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magic_items[m_idx].chk = protocol_nexwatch_checksum(magic_items[m_idx].magic, id, parity);
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if(magic_items[m_idx].chk == chk) {
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break;
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}
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}
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furi_string_printf(result, "ID: %lu, M:%u\r\nType: %s\r\n", id, mode, magic_items[m_idx].desc);
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}
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bool protocol_nexwatch_write_data(ProtocolNexwatch* protocol, void* data) {
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LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
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bool result = false;
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protocol_nexwatch_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] = LFRFID_T5577_MODULATION_PSK1 | LFRFID_T5577_BITRATE_RF_32 |
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(3 << LFRFID_T5577_MAXBLOCK_SHIFT);
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request->t5577.block[1] = bit_lib_get_bits_32(protocol->encoded_data, 0, 32);
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request->t5577.block[2] = bit_lib_get_bits_32(protocol->encoded_data, 32, 32);
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request->t5577.block[3] = bit_lib_get_bits_32(protocol->encoded_data, 64, 32);
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request->t5577.blocks_to_write = 4;
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result = true;
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}
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return result;
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};
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const ProtocolBase protocol_nexwatch = {
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.name = "Nexwatch",
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.manufacturer = "Honeywell",
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.data_size = NEXWATCH_DECODED_DATA_SIZE,
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.features = LFRFIDFeaturePSK,
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.validate_count = 6,
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.alloc = (ProtocolAlloc)protocol_nexwatch_alloc,
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.free = (ProtocolFree)protocol_nexwatch_free,
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.get_data = (ProtocolGetData)protocol_nexwatch_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_nexwatch_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_nexwatch_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_nexwatch_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_nexwatch_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_nexwatch_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_nexwatch_render_data,
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.write_data = (ProtocolWriteData)protocol_nexwatch_write_data,
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};
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