mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-12-18 00:33:09 +00:00
284 lines
9.6 KiB
C
284 lines
9.6 KiB
C
#include <furi.h>
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#include <toolbox/protocols/protocol.h>
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#include <lfrfid/tools/fsk_demod.h>
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#include <lfrfid/tools/fsk_osc.h>
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#include "lfrfid_protocols.h"
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#include <lfrfid/tools/bit_lib.h>
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#define JITTER_TIME (20)
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#define MIN_TIME (64 - JITTER_TIME)
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#define MAX_TIME (80 + JITTER_TIME)
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#define HID_DATA_SIZE 11
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#define HID_PREAMBLE_SIZE 1
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#define HID_PROTOCOL_SIZE_UNKNOWN 0
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#define HID_ENCODED_DATA_SIZE (HID_PREAMBLE_SIZE + HID_DATA_SIZE + HID_PREAMBLE_SIZE)
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#define HID_ENCODED_BIT_SIZE ((HID_PREAMBLE_SIZE + HID_DATA_SIZE) * 8)
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#define HID_DECODED_DATA_SIZE (6)
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#define HID_DECODED_BIT_SIZE ((HID_ENCODED_BIT_SIZE - HID_PREAMBLE_SIZE * 8) / 2)
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#define HID_PREAMBLE 0x1D
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typedef struct {
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FSKDemod* fsk_demod;
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} ProtocolHIDDecoder;
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typedef struct {
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FSKOsc* fsk_osc;
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uint8_t encoded_index;
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uint32_t pulse;
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} ProtocolHIDEncoder;
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typedef struct {
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ProtocolHIDDecoder decoder;
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ProtocolHIDEncoder encoder;
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uint8_t encoded_data[HID_ENCODED_DATA_SIZE];
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uint8_t data[HID_DECODED_DATA_SIZE];
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} ProtocolHID;
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ProtocolHID* protocol_hid_generic_alloc(void) {
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ProtocolHID* protocol = malloc(sizeof(ProtocolHID));
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protocol->decoder.fsk_demod = fsk_demod_alloc(MIN_TIME, 6, MAX_TIME, 5);
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protocol->encoder.fsk_osc = fsk_osc_alloc(8, 10, 50);
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return protocol;
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};
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void protocol_hid_generic_free(ProtocolHID* protocol) {
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fsk_demod_free(protocol->decoder.fsk_demod);
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fsk_osc_free(protocol->encoder.fsk_osc);
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free(protocol);
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};
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uint8_t* protocol_hid_generic_get_data(ProtocolHID* protocol) {
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return protocol->data;
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};
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void protocol_hid_generic_decoder_start(ProtocolHID* protocol) {
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memset(protocol->encoded_data, 0, HID_ENCODED_DATA_SIZE);
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};
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static bool protocol_hid_generic_can_be_decoded(const uint8_t* data) {
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// check preamble
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if(data[0] != HID_PREAMBLE || data[HID_PREAMBLE_SIZE + HID_DATA_SIZE] != HID_PREAMBLE) {
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return false;
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}
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// check for manchester encoding
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for(size_t i = HID_PREAMBLE_SIZE; i < (HID_PREAMBLE_SIZE + HID_DATA_SIZE); i++) {
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for(size_t n = 0; n < 4; n++) {
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uint8_t bit_pair = (data[i] >> (n * 2)) & 0b11;
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if(bit_pair == 0b11 || bit_pair == 0b00) {
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return false;
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}
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}
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}
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return true;
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}
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static void protocol_hid_generic_decode(const uint8_t* from, uint8_t* to) {
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size_t bit_index = 0;
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for(size_t i = HID_PREAMBLE_SIZE; i < (HID_PREAMBLE_SIZE + HID_DATA_SIZE); i++) {
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for(size_t n = 0; n < 4; n++) {
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uint8_t bit_pair = (from[i] >> (6 - (n * 2))) & 0b11;
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if(bit_pair == 0b01) {
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bit_lib_set_bit(to, bit_index, 0);
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} else if(bit_pair == 0b10) {
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bit_lib_set_bit(to, bit_index, 1);
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}
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bit_index++;
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}
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}
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}
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/**
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* Decodes size from the HID Proximity header:
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* - If any of the first six bits is 1, the key is composed of the bits
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* following the first 1
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* - Otherwise, if the first six bits are 0:
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* - If the seventh bit is 0, the key is composed of the remaining 37 bits.
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* - If the seventh bit is 1, the size header continues until the next 1 bit,
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* and the key is composed of however many bits remain.
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*
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* HID Proximity keys are 26 bits at minimum. If the header implies a key size
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* under 26 bits, this function returns HID_PROTOCOL_SIZE_UNKNOWN.
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*/
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static uint8_t protocol_hid_generic_decode_protocol_size(ProtocolHID* protocol) {
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for(size_t bit_index = 0; bit_index < 6; bit_index++) {
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if(bit_lib_get_bit(protocol->data, bit_index)) {
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return HID_DECODED_BIT_SIZE - bit_index - 1;
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}
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}
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if(!bit_lib_get_bit(protocol->data, 6)) {
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return 37;
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}
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size_t bit_index = 7;
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uint8_t size = 36;
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while(!bit_lib_get_bit(protocol->data, bit_index) && size >= 26) {
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size--;
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bit_index++;
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}
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return size < 26 ? HID_PROTOCOL_SIZE_UNKNOWN : size;
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}
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bool protocol_hid_generic_decoder_feed(ProtocolHID* protocol, bool level, uint32_t duration) {
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bool value;
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uint32_t count;
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bool result = false;
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fsk_demod_feed(protocol->decoder.fsk_demod, level, duration, &value, &count);
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if(count > 0) {
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for(size_t i = 0; i < count; i++) {
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bit_lib_push_bit(protocol->encoded_data, HID_ENCODED_DATA_SIZE, value);
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if(protocol_hid_generic_can_be_decoded(protocol->encoded_data)) {
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protocol_hid_generic_decode(protocol->encoded_data, protocol->data);
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result = true;
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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_hid_generic_encode(ProtocolHID* protocol) {
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protocol->encoded_data[0] = HID_PREAMBLE;
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size_t bit_index = 0;
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for(size_t i = 0; i < HID_DECODED_BIT_SIZE; i++) {
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bool bit = bit_lib_get_bit(protocol->data, i);
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if(bit) {
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bit_lib_set_bit(protocol->encoded_data, 8 + bit_index, 1);
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bit_lib_set_bit(protocol->encoded_data, 8 + bit_index + 1, 0);
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} else {
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bit_lib_set_bit(protocol->encoded_data, 8 + bit_index, 0);
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bit_lib_set_bit(protocol->encoded_data, 8 + bit_index + 1, 1);
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}
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bit_index += 2;
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}
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}
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bool protocol_hid_generic_encoder_start(ProtocolHID* protocol) {
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protocol->encoder.encoded_index = 0;
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protocol->encoder.pulse = 0;
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protocol_hid_generic_encode(protocol);
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return true;
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};
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LevelDuration protocol_hid_generic_encoder_yield(ProtocolHID* protocol) {
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bool level = 0;
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uint32_t duration = 0;
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// if pulse is zero, we need to output high, otherwise we need to output low
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if(protocol->encoder.pulse == 0) {
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// get bit
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uint8_t bit = bit_lib_get_bit(protocol->encoded_data, protocol->encoder.encoded_index);
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// get pulse from oscillator
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bool advance = fsk_osc_next(protocol->encoder.fsk_osc, bit, &duration);
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if(advance) {
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bit_lib_increment_index(protocol->encoder.encoded_index, HID_ENCODED_BIT_SIZE);
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}
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// duration diveded by 2 because we need to output high and low
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duration = duration / 2;
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protocol->encoder.pulse = duration;
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level = true;
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} else {
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// output low half and reset pulse
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duration = protocol->encoder.pulse;
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protocol->encoder.pulse = 0;
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level = false;
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}
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return level_duration_make(level, duration);
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};
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bool protocol_hid_generic_write_data(ProtocolHID* protocol, void* data) {
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LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
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bool result = false;
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// Correct protocol data by redecoding
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protocol_hid_generic_encoder_start(protocol);
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protocol_hid_generic_decode(protocol->encoded_data, protocol->data);
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protocol_hid_generic_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] = LFRFID_T5577_MODULATION_FSK2a | LFRFID_T5577_BITRATE_RF_50 |
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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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static void protocol_hid_generic_string_cat_protocol_bits(ProtocolHID* protocol, uint8_t protocol_size, string_t result) {
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// round up to the nearest nibble
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const uint8_t hex_character_count = (protocol_size + 3) / 4;
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const uint8_t protocol_bit_index = HID_DECODED_BIT_SIZE - protocol_size;
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for(size_t i = 0; i < hex_character_count; i++) {
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uint8_t nibble =
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i == 0 ? bit_lib_get_bits(
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protocol->data, protocol_bit_index, protocol_size % 4 == 0 ? 4 : protocol_size % 4) :
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bit_lib_get_bits(protocol->data, protocol_bit_index + i * 4, 4);
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string_cat_printf(result, "%X", nibble & 0xF);
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}
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}
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void protocol_hid_generic_render_data(ProtocolHID* protocol, string_t result) {
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const uint8_t protocol_size = protocol_hid_generic_decode_protocol_size(protocol);
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if(protocol_size == HID_PROTOCOL_SIZE_UNKNOWN) {
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string_printf(
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result,
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"Generic HID Proximity\r\n"
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"Data: %02X%02X%02X%02X%02X%X",
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protocol->data[0],
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protocol->data[1],
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protocol->data[2],
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protocol->data[3],
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protocol->data[4],
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protocol->data[5] >> 4);
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} else {
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string_printf(
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result,
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"%hhu-bit HID Proximity\r\n"
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"Data: ",
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protocol_size);
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protocol_hid_generic_string_cat_protocol_bits(protocol, protocol_size, result);
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}
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};
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const ProtocolBase protocol_hid_generic = {
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.name = "HIDProx",
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.manufacturer = "Generic",
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.data_size = HID_DECODED_DATA_SIZE,
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.features = LFRFIDFeatureASK,
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.validate_count = 6,
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.alloc = (ProtocolAlloc)protocol_hid_generic_alloc,
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.free = (ProtocolFree)protocol_hid_generic_free,
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.get_data = (ProtocolGetData)protocol_hid_generic_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_hid_generic_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_hid_generic_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_hid_generic_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_hid_generic_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_hid_generic_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_hid_generic_render_data,
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.write_data = (ProtocolWriteData)protocol_hid_generic_write_data,
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};
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