flipperzero-firmware/lib/lfrfid/protocols/protocol_paradox.c

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#include <furi.h>
#include <toolbox/protocols/protocol.h>
#include <lfrfid/tools/fsk_demod.h>
#include <lfrfid/tools/fsk_osc.h>
#include <lfrfid/tools/bit_lib.h>
#include "lfrfid_protocols.h"
#define JITTER_TIME (20)
#define MIN_TIME (64 - JITTER_TIME)
#define MAX_TIME (80 + JITTER_TIME)
#define PARADOX_DECODED_DATA_SIZE (6)
#define PARADOX_PREAMBLE_LENGTH (8)
#define PARADOX_ENCODED_BIT_SIZE (96)
#define PARADOX_ENCODED_DATA_SIZE (((PARADOX_ENCODED_BIT_SIZE) / 8) + 1)
#define PARADOX_ENCODED_DATA_LAST (PARADOX_ENCODED_DATA_SIZE - 1)
typedef struct {
FSKDemod* fsk_demod;
} ProtocolParadoxDecoder;
typedef struct {
FSKOsc* fsk_osc;
uint8_t encoded_index;
} ProtocolParadoxEncoder;
typedef struct {
ProtocolParadoxDecoder decoder;
ProtocolParadoxEncoder encoder;
uint8_t encoded_data[PARADOX_ENCODED_DATA_SIZE];
uint8_t data[PARADOX_DECODED_DATA_SIZE];
} ProtocolParadox;
ProtocolParadox* protocol_paradox_alloc(void) {
ProtocolParadox* protocol = malloc(sizeof(ProtocolParadox));
protocol->decoder.fsk_demod = fsk_demod_alloc(MIN_TIME, 6, MAX_TIME, 5);
protocol->encoder.fsk_osc = fsk_osc_alloc(8, 10, 50);
return protocol;
};
void protocol_paradox_free(ProtocolParadox* protocol) {
fsk_demod_free(protocol->decoder.fsk_demod);
fsk_osc_free(protocol->encoder.fsk_osc);
free(protocol);
};
uint8_t* protocol_paradox_get_data(ProtocolParadox* protocol) {
return protocol->data;
};
void protocol_paradox_decoder_start(ProtocolParadox* protocol) {
memset(protocol->encoded_data, 0, PARADOX_ENCODED_DATA_SIZE);
};
static bool protocol_paradox_can_be_decoded(ProtocolParadox* protocol) {
// check preamble
if(protocol->encoded_data[0] != 0b00001111 ||
protocol->encoded_data[PARADOX_ENCODED_DATA_LAST] != 0b00001111)
return false;
for(uint32_t i = PARADOX_PREAMBLE_LENGTH; i < 96; i += 2) {
if(bit_lib_get_bit(protocol->encoded_data, i) ==
bit_lib_get_bit(protocol->encoded_data, i + 1)) {
return false;
}
}
return true;
}
static void protocol_paradox_decode(uint8_t* encoded_data, uint8_t* decoded_data) {
for(uint32_t i = PARADOX_PREAMBLE_LENGTH; i < 96; i += 2) {
if(bit_lib_get_bits(encoded_data, i, 2) == 0b01) {
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 0);
} else if(bit_lib_get_bits(encoded_data, i, 2) == 0b10) {
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 1);
}
}
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 0);
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 0);
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 0);
bit_lib_push_bit(decoded_data, PARADOX_DECODED_DATA_SIZE, 0);
}
bool protocol_paradox_decoder_feed(ProtocolParadox* protocol, bool level, uint32_t duration) {
bool value;
uint32_t count;
fsk_demod_feed(protocol->decoder.fsk_demod, level, duration, &value, &count);
if(count > 0) {
for(size_t i = 0; i < count; i++) {
bit_lib_push_bit(protocol->encoded_data, PARADOX_ENCODED_DATA_SIZE, value);
if(protocol_paradox_can_be_decoded(protocol)) {
protocol_paradox_decode(protocol->encoded_data, protocol->data);
return true;
}
}
}
return false;
};
static void protocol_paradox_encode(const uint8_t* decoded_data, uint8_t* encoded_data) {
// preamble
bit_lib_set_bits(encoded_data, 0, 0b00001111, 8);
for(size_t i = 0; i < 44; i++) {
if(bit_lib_get_bit(decoded_data, i)) {
bit_lib_set_bits(encoded_data, PARADOX_PREAMBLE_LENGTH + i * 2, 0b10, 2);
} else {
bit_lib_set_bits(encoded_data, PARADOX_PREAMBLE_LENGTH + i * 2, 0b01, 2);
}
}
};
bool protocol_paradox_encoder_start(ProtocolParadox* protocol) {
protocol_paradox_encode(protocol->data, (uint8_t*)protocol->encoded_data);
protocol->encoder.encoded_index = 0;
fsk_osc_reset(protocol->encoder.fsk_osc);
return true;
};
LevelDuration protocol_paradox_encoder_yield(ProtocolParadox* protocol) {
bool level;
uint32_t duration;
bool bit = bit_lib_get_bit(protocol->encoded_data, protocol->encoder.encoded_index);
bool advance = fsk_osc_next_half(protocol->encoder.fsk_osc, bit, &level, &duration);
if(advance) {
bit_lib_increment_index(protocol->encoder.encoded_index, PARADOX_ENCODED_BIT_SIZE);
}
return level_duration_make(level, duration);
};
void protocol_paradox_render_data(ProtocolParadox* protocol, string_t result) {
uint8_t* decoded_data = protocol->data;
uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8);
uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16);
string_cat_printf(result, "Facility: %u\r\n", fc);
string_cat_printf(result, "Card: %lu\r\n", card_id);
string_cat_printf(result, "Data: ");
for(size_t i = 0; i < PARADOX_DECODED_DATA_SIZE; i++) {
string_cat_printf(result, "%02X", decoded_data[i]);
}
};
void protocol_paradox_render_brief_data(ProtocolParadox* protocol, string_t result) {
uint8_t* decoded_data = protocol->data;
uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8);
uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16);
string_cat_printf(result, "FC: %03u, Card: %05u", fc, card_id);
};
bool protocol_paradox_write_data(ProtocolParadox* protocol, void* data) {
LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
bool result = false;
// Correct protocol data by redecoding
protocol_paradox_encode(protocol->data, (uint8_t*)protocol->encoded_data);
protocol_paradox_decode(protocol->encoded_data, protocol->data);
protocol_paradox_encode(protocol->data, (uint8_t*)protocol->encoded_data);
if(request->write_type == LFRFIDWriteTypeT5577) {
request->t5577.block[0] = LFRFID_T5577_MODULATION_FSK2a | LFRFID_T5577_BITRATE_RF_50 |
(3 << LFRFID_T5577_MAXBLOCK_SHIFT);
request->t5577.block[1] = bit_lib_get_bits_32(protocol->encoded_data, 0, 32);
request->t5577.block[2] = bit_lib_get_bits_32(protocol->encoded_data, 32, 32);
request->t5577.block[3] = bit_lib_get_bits_32(protocol->encoded_data, 64, 32);
request->t5577.blocks_to_write = 4;
result = true;
}
return result;
};
const ProtocolBase protocol_paradox = {
.name = "Paradox",
.manufacturer = "Paradox",
.data_size = PARADOX_DECODED_DATA_SIZE,
.features = LFRFIDFeatureASK,
.validate_count = 3,
.alloc = (ProtocolAlloc)protocol_paradox_alloc,
.free = (ProtocolFree)protocol_paradox_free,
.get_data = (ProtocolGetData)protocol_paradox_get_data,
.decoder =
{
.start = (ProtocolDecoderStart)protocol_paradox_decoder_start,
.feed = (ProtocolDecoderFeed)protocol_paradox_decoder_feed,
},
.encoder =
{
.start = (ProtocolEncoderStart)protocol_paradox_encoder_start,
.yield = (ProtocolEncoderYield)protocol_paradox_encoder_yield,
},
.render_data = (ProtocolRenderData)protocol_paradox_render_data,
.render_brief_data = (ProtocolRenderData)protocol_paradox_render_brief_data,
.write_data = (ProtocolWriteData)protocol_paradox_write_data,
};