264 lines
9.0 KiB
C
264 lines
9.0 KiB
C
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#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 KERI_PREAMBLE_BIT_SIZE (33)
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#define KERI_PREAMBLE_DATA_SIZE (5)
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#define KERI_ENCODED_BIT_SIZE (64)
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#define KERI_ENCODED_DATA_SIZE (((KERI_ENCODED_BIT_SIZE) / 8) + KERI_PREAMBLE_DATA_SIZE)
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#define KERI_ENCODED_DATA_LAST ((KERI_ENCODED_BIT_SIZE) / 8)
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#define KERI_DECODED_BIT_SIZE (28)
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#define KERI_DECODED_DATA_SIZE (4)
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#define KERI_US_PER_BIT (255)
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#define KERI_ENCODER_PULSES_PER_BIT (16)
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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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} ProtocolKeriEncoder;
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typedef struct {
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uint8_t encoded_data[KERI_ENCODED_DATA_SIZE];
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uint8_t negative_encoded_data[KERI_ENCODED_DATA_SIZE];
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uint8_t corrupted_encoded_data[KERI_ENCODED_DATA_SIZE];
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uint8_t corrupted_negative_encoded_data[KERI_ENCODED_DATA_SIZE];
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uint8_t data[KERI_DECODED_DATA_SIZE];
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ProtocolKeriEncoder encoder;
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} ProtocolKeri;
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ProtocolKeri* protocol_keri_alloc(void) {
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ProtocolKeri* protocol = malloc(sizeof(ProtocolKeri));
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return protocol;
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};
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void protocol_keri_free(ProtocolKeri* protocol) {
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free(protocol);
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};
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uint8_t* protocol_keri_get_data(ProtocolKeri* protocol) {
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return protocol->data;
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};
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void protocol_keri_decoder_start(ProtocolKeri* protocol) {
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memset(protocol->encoded_data, 0, KERI_ENCODED_DATA_SIZE);
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memset(protocol->negative_encoded_data, 0, KERI_ENCODED_DATA_SIZE);
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memset(protocol->corrupted_encoded_data, 0, KERI_ENCODED_DATA_SIZE);
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memset(protocol->corrupted_negative_encoded_data, 0, KERI_ENCODED_DATA_SIZE);
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};
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static bool protocol_keri_check_preamble(uint8_t* data, size_t bit_index) {
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// Preamble 11100000 00000000 00000000 00000000 1
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if(*(uint32_t*)&data[bit_index / 8] != 0b00000000000000000000000011100000) return false;
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if(bit_lib_get_bit(data, bit_index + 32) != 1) return false;
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return true;
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}
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static bool protocol_keri_can_be_decoded(uint8_t* data) {
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if(!protocol_keri_check_preamble(data, 0)) return false;
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if(!protocol_keri_check_preamble(data, 64)) return false;
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///if(bit_lib_get_bit(data, 61) != 0) return false;
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//if(bit_lib_get_bit(data, 60) != 0) return false;
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return true;
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}
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static bool protocol_keri_decoder_feed_internal(bool polarity, uint32_t time, uint8_t* data) {
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time += (KERI_US_PER_BIT / 2);
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size_t bit_count = (time / KERI_US_PER_BIT);
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bool result = false;
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if(bit_count < KERI_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, KERI_ENCODED_DATA_SIZE, polarity);
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if(protocol_keri_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_keri_descramble(uint32_t* fc, uint32_t* cn, uint32_t* internal_id) {
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const uint8_t card_to_id[] = {255, 255, 255, 255, 13, 12, 20, 5, 16, 6, 21,
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17, 8, 255, 0, 7, 10, 15, 255, 11, 4, 1,
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255, 18, 255, 19, 2, 14, 3, 9, 255, 255};
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const uint8_t card_to_fc[] = {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 0, 255, 255, 255, 255, 2, 255, 255, 255,
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3, 255, 4, 255, 255, 255, 255, 255, 1, 255};
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*fc = 0;
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*cn = 0;
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for(uint8_t card_idx = 0; card_idx < 32; card_idx++) {
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bool bit = (*internal_id >> card_idx) & 1;
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// Card ID
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if(card_to_id[card_idx] < 32) {
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*cn = *cn | (bit << card_to_id[card_idx]);
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}
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// Card FC
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if(card_to_fc[card_idx] < 32) {
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*fc = *fc | (bit << card_to_fc[card_idx]);
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}
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}
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}
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static void protocol_keri_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, 32, 32);
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data_to[3] = (uint8_t)id;
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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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}
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bool protocol_keri_decoder_feed(ProtocolKeri* protocol, bool level, uint32_t duration) {
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bool result = false;
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if(duration > (KERI_US_PER_BIT / 2)) {
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if(protocol_keri_decoder_feed_internal(level, duration, protocol->encoded_data)) {
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protocol_keri_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_keri_decoder_feed_internal(!level, duration, protocol->negative_encoded_data)) {
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protocol_keri_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 > (KERI_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_keri_decoder_feed_internal(level, duration, protocol->corrupted_encoded_data)) {
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protocol_keri_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_keri_decoder_feed_internal(
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!level, duration, protocol->corrupted_negative_encoded_data)) {
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protocol_keri_decoder_save(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_keri_encoder_start(ProtocolKeri* protocol) {
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memset(protocol->encoded_data, 0, KERI_ENCODED_DATA_SIZE);
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*(uint32_t*)&protocol->encoded_data[0] = 0b00000000000000000000000011100000;
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bit_lib_copy_bits(protocol->encoded_data, 32, 32, protocol->data, 0);
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protocol->encoder.last_bit =
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bit_lib_get_bit(protocol->encoded_data, KERI_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_keri_encoder_yield(ProtocolKeri* protocol) {
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LevelDuration level_duration;
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ProtocolKeriEncoder* 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 >= KERI_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, KERI_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_keri_render_data(ProtocolKeri* protocol, string_t result) {
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uint32_t data = bit_lib_get_bits_32(protocol->data, 0, 32);
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uint32_t internal_id = data & 0x7FFFFFFF;
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uint32_t fc = 0;
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uint32_t cn = 0;
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protocol_keri_descramble(&fc, &cn, &data);
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string_printf(result, "Internal ID: %u\r\nFC: %u, Card: %u\r\n", internal_id, fc, cn);
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}
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bool protocol_keri_write_data(ProtocolKeri* protocol, void* data) {
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LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
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bool result = false;
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protocol_keri_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] = LFRFID_T5577_TESTMODE_DISABLED | LFRFID_T5577_X_MODE |
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LFRFID_T5577_MODULATION_PSK1 | LFRFID_T5577_PSKCF_RF_2 |
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(2 << LFRFID_T5577_MAXBLOCK_SHIFT);
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request->t5577.block[0] |= 0xF << 18;
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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.blocks_to_write = 3;
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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_keri = {
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.name = "Keri",
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.manufacturer = "Keri",
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.data_size = KERI_DECODED_DATA_SIZE,
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.features = LFRFIDFeaturePSK,
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.validate_count = 6,
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.alloc = (ProtocolAlloc)protocol_keri_alloc,
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.free = (ProtocolFree)protocol_keri_free,
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.get_data = (ProtocolGetData)protocol_keri_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_keri_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_keri_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_keri_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_keri_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_keri_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_keri_render_data,
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.write_data = (ProtocolWriteData)protocol_keri_write_data,
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};
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