Add support for PAC/Stanley tags (#1648)
* Add support for PAC/Stanley tags * Address review comments
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ffa3ff5e7c
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1350dcaf63
@ -356,7 +356,7 @@ bool flipper_format_stream_read_value_line(
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uint8_t* data = _data;
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if(string_size(value) >= 2) {
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// sscanf "%02X" does not work here
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if(hex_chars_to_uint8(
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if(hex_char_to_uint8(
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string_get_char(value, 0),
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string_get_char(value, 1),
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&data[i])) {
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@ -8,6 +8,7 @@
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#include "protocol_fdx_b.h"
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#include "protocol_hid_generic.h"
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#include "protocol_hid_ex_generic.h"
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#include "protocol_pac_stanley.h"
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const ProtocolBase* lfrfid_protocols[] = {
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[LFRFIDProtocolEM4100] = &protocol_em4100,
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@ -19,4 +20,5 @@ const ProtocolBase* lfrfid_protocols[] = {
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[LFRFIDProtocolFDXB] = &protocol_fdx_b,
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[LFRFIDProtocolHidGeneric] = &protocol_hid_generic,
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[LFRFIDProtocolHidExGeneric] = &protocol_hid_ex_generic,
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[LFRFIDProtocolPACStanley] = &protocol_pac_stanley,
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};
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@ -17,6 +17,7 @@ typedef enum {
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LFRFIDProtocolFDXB,
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LFRFIDProtocolHidGeneric,
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LFRFIDProtocolHidExGeneric,
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LFRFIDProtocolPACStanley,
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LFRFIDProtocolMax,
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} LFRFIDProtocol;
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227
lib/lfrfid/protocols/protocol_pac_stanley.c
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227
lib/lfrfid/protocols/protocol_pac_stanley.c
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@ -0,0 +1,227 @@
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#include <furi.h>
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#include <math.h>
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#include <toolbox/protocols/protocol.h>
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#include <toolbox/hex.h>
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#include <lfrfid/tools/bit_lib.h>
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#include "lfrfid_protocols.h"
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#define PAC_STANLEY_ENCODED_BIT_SIZE (128)
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#define PAC_STANLEY_ENCODED_BYTE_SIZE (((PAC_STANLEY_ENCODED_BIT_SIZE) / 8))
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#define PAC_STANLEY_PREAMBLE_BIT_SIZE (8)
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#define PAC_STANLEY_PREAMBLE_BYTE_SIZE (1)
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#define PAC_STANLEY_ENCODED_BYTE_FULL_SIZE \
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(PAC_STANLEY_ENCODED_BYTE_SIZE + PAC_STANLEY_PREAMBLE_BYTE_SIZE)
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#define PAC_STANLEY_BYTE_LENGTH (10) // start bit, 7 data bits, parity bit, stop bit
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#define PAC_STANLEY_DATA_START_INDEX 8 + (3 * PAC_STANLEY_BYTE_LENGTH) + 1
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#define PAC_STANLEY_DECODED_DATA_SIZE (4)
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#define PAC_STANLEY_ENCODED_DATA_SIZE (sizeof(ProtocolPACStanley))
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#define PAC_STANLEY_CLOCKS_IN_US (32)
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#define PAC_STANLEY_CYCLE_LENGTH (256)
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#define PAC_STANLEY_MIN_TIME (60)
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#define PAC_STANLEY_MAX_TIME (4000)
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typedef struct {
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bool inverted;
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bool got_preamble;
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size_t encoded_index;
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uint8_t encoded_data[PAC_STANLEY_ENCODED_BYTE_FULL_SIZE];
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uint8_t data[PAC_STANLEY_DECODED_DATA_SIZE];
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} ProtocolPACStanley;
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ProtocolPACStanley* protocol_pac_stanley_alloc(void) {
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ProtocolPACStanley* protocol = malloc(sizeof(ProtocolPACStanley));
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return (void*)protocol;
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}
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void protocol_pac_stanley_free(ProtocolPACStanley* protocol) {
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free(protocol);
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}
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uint8_t* protocol_pac_stanley_get_data(ProtocolPACStanley* protocol) {
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return protocol->data;
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}
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static void protocol_pac_stanley_decode(ProtocolPACStanley* protocol) {
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uint8_t asciiCardId[8];
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for(size_t idx = 0; idx < 8; idx++) {
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uint8_t byte = bit_lib_reverse_8_fast(bit_lib_get_bits(
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protocol->encoded_data,
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PAC_STANLEY_DATA_START_INDEX + (PAC_STANLEY_BYTE_LENGTH * idx),
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8));
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asciiCardId[idx] = byte & 0x7F; // discard the parity bit
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}
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hex_chars_to_uint8((char*)asciiCardId, protocol->data);
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}
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static bool protocol_pac_stanley_can_be_decoded(ProtocolPACStanley* protocol) {
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// Check preamble
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if(bit_lib_get_bits(protocol->encoded_data, 0, 8) != 0b11111111) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 8) != 0) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 9) != 0) return false;
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if(bit_lib_get_bit(protocol->encoded_data, 10) != 1) return false;
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if(bit_lib_get_bits(protocol->encoded_data, 11, 8) != 0b00000010) return false;
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// Check next preamble
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if(bit_lib_get_bits(protocol->encoded_data, 128, 8) != 0b11111111) return false;
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// Checksum
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uint8_t checksum = 0;
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uint8_t stripped_byte;
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for(size_t idx = 0; idx < 9; idx++) {
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uint8_t byte = bit_lib_reverse_8_fast(bit_lib_get_bits(
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protocol->encoded_data,
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PAC_STANLEY_DATA_START_INDEX + (PAC_STANLEY_BYTE_LENGTH * idx),
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8));
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stripped_byte = byte & 0x7F; // discard the parity bit
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if(bit_lib_test_parity_32(stripped_byte, BitLibParityOdd) != (byte & 0x80) >> 7) {
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return false;
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}
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if(idx < 8) checksum ^= stripped_byte;
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}
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if(stripped_byte != checksum) return false;
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return true;
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}
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void protocol_pac_stanley_decoder_start(ProtocolPACStanley* protocol) {
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memset(protocol->data, 0, PAC_STANLEY_DECODED_DATA_SIZE);
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protocol->inverted = false;
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protocol->got_preamble = false;
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}
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bool protocol_pac_stanley_decoder_feed(ProtocolPACStanley* protocol, bool level, uint32_t duration) {
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bool pushed = false;
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if(duration > PAC_STANLEY_MAX_TIME) return false;
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uint8_t pulses = (uint8_t)round((float)duration / PAC_STANLEY_CYCLE_LENGTH);
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// Handle last stopbit & preamble (1 sb, 8 bit preamble)
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if(pulses >= 9 && !protocol->got_preamble) {
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pulses = 8;
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protocol->got_preamble = true;
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protocol->inverted = !level;
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} else if(pulses >= 9 && protocol->got_preamble) {
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protocol->got_preamble = false;
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} else if(pulses == 0 && duration > PAC_STANLEY_MIN_TIME) {
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pulses = 1;
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}
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if(pulses) {
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for(uint8_t i = 0; i < pulses; i++) {
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bit_lib_push_bit(
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protocol->encoded_data,
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PAC_STANLEY_ENCODED_BYTE_FULL_SIZE,
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level ^ protocol->inverted);
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}
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pushed = true;
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}
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if(pushed && protocol_pac_stanley_can_be_decoded(protocol)) {
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protocol_pac_stanley_decode(protocol);
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return true;
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}
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return false;
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}
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bool protocol_pac_stanley_encoder_start(ProtocolPACStanley* protocol) {
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memset(protocol->encoded_data, 0, PAC_STANLEY_ENCODED_BYTE_SIZE);
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uint8_t idbytes[10];
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idbytes[0] = '2';
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idbytes[1] = '0';
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uint8_to_hex_chars(protocol->data, &idbytes[2], 8);
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// insert start and stop bits
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for(size_t i = 0; i < 16; i++) protocol->encoded_data[i] = 0x40 >> (i + 3) % 5 * 2;
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protocol->encoded_data[0] = 0xFF; // mark + stop
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protocol->encoded_data[1] = 0x20; // start + reflect8(STX)
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uint8_t checksum = 0;
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for(size_t i = 2; i < 13; i++) {
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uint8_t shift = 7 - (i + 3) % 4 * 2;
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uint8_t index = i + (i - 1) / 4;
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uint16_t pattern;
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if(i < 12) {
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pattern = bit_lib_reverse_8_fast(idbytes[i - 2]);
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pattern |= bit_lib_test_parity_32(pattern, BitLibParityOdd);
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if(i > 3) checksum ^= idbytes[i - 2];
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} else {
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pattern = (bit_lib_reverse_8_fast(checksum) & 0xFE) |
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(bit_lib_test_parity_32(checksum, BitLibParityOdd));
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}
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pattern <<= shift;
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protocol->encoded_data[index] |= pattern >> 8 & 0xFF;
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protocol->encoded_data[index + 1] |= pattern & 0xFF;
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}
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protocol->encoded_index = 0;
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return true;
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}
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LevelDuration protocol_pac_stanley_encoder_yield(ProtocolPACStanley* protocol) {
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uint16_t length = PAC_STANLEY_CLOCKS_IN_US;
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bool bit = bit_lib_get_bit(protocol->encoded_data, protocol->encoded_index);
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bit_lib_increment_index(protocol->encoded_index, PAC_STANLEY_ENCODED_BIT_SIZE);
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while(bit_lib_get_bit(protocol->encoded_data, protocol->encoded_index) == bit) {
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length += PAC_STANLEY_CLOCKS_IN_US;
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bit_lib_increment_index(protocol->encoded_index, PAC_STANLEY_ENCODED_BIT_SIZE);
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}
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return level_duration_make(bit, length);
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}
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bool protocol_pac_stanley_write_data(ProtocolPACStanley* protocol, void* data) {
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LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
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bool result = false;
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protocol_pac_stanley_encoder_start(protocol);
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if(request->write_type == LFRFIDWriteTypeT5577) {
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request->t5577.block[0] = LFRFID_T5577_MODULATION_DIRECT | LFRFID_T5577_BITRATE_RF_32 |
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(4 << 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.block[4] = bit_lib_get_bits_32(protocol->encoded_data, 96, 32);
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request->t5577.blocks_to_write = 5;
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result = true;
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}
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return result;
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}
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void protocol_pac_stanley_render_data(ProtocolPACStanley* protocol, string_t result) {
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uint8_t* data = protocol->data;
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string_printf(result, "CIN: %02X%02X%02X%02X", data[0], data[1], data[2], data[3]);
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}
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const ProtocolBase protocol_pac_stanley = {
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.name = "PAC/Stanley",
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.manufacturer = "N/A",
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.data_size = PAC_STANLEY_DECODED_DATA_SIZE,
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.features = LFRFIDFeatureASK,
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.validate_count = 3,
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.alloc = (ProtocolAlloc)protocol_pac_stanley_alloc,
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.free = (ProtocolFree)protocol_pac_stanley_free,
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.get_data = (ProtocolGetData)protocol_pac_stanley_get_data,
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.decoder =
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{
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.start = (ProtocolDecoderStart)protocol_pac_stanley_decoder_start,
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.feed = (ProtocolDecoderFeed)protocol_pac_stanley_decoder_feed,
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},
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.encoder =
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{
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.start = (ProtocolEncoderStart)protocol_pac_stanley_encoder_start,
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.yield = (ProtocolEncoderYield)protocol_pac_stanley_encoder_yield,
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},
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.render_data = (ProtocolRenderData)protocol_pac_stanley_render_data,
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.render_brief_data = (ProtocolRenderData)protocol_pac_stanley_render_data,
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.write_data = (ProtocolWriteData)protocol_pac_stanley_write_data,
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};
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4
lib/lfrfid/protocols/protocol_pac_stanley.h
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4
lib/lfrfid/protocols/protocol_pac_stanley.h
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@ -0,0 +1,4 @@
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#pragma once
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#include <toolbox/protocols/protocol.h>
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extern const ProtocolBase protocol_pac_stanley;
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@ -262,6 +262,13 @@ uint16_t bit_lib_reverse_16_fast(uint16_t data) {
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return result;
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}
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uint8_t bit_lib_reverse_8_fast(uint8_t byte) {
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byte = (byte & 0xF0) >> 4 | (byte & 0x0F) << 4;
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byte = (byte & 0xCC) >> 2 | (byte & 0x33) << 2;
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byte = (byte & 0xAA) >> 1 | (byte & 0x55) << 1;
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return byte;
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}
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uint16_t bit_lib_crc16(
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uint8_t const* data,
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size_t data_size,
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@ -194,6 +194,14 @@ void bit_lib_print_regions(
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*/
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uint16_t bit_lib_reverse_16_fast(uint16_t data);
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/**
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* @brief Reverse bits in uint8_t, faster than generic bit_lib_reverse_bits.
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*
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* @param byte Byte
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* @return uint8_t the reversed byte
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*/
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uint8_t bit_lib_reverse_8_fast(uint8_t byte);
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/**
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* @brief Slow, but generic CRC16 implementation
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*
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@ -782,7 +782,7 @@ static void nfc_device_load_mifare_classic_block(
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char hi = string_get_char(block_str, 3 * i);
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char low = string_get_char(block_str, 3 * i + 1);
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uint8_t byte = 0;
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if(hex_chars_to_uint8(hi, low, &byte)) {
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if(hex_char_to_uint8(hi, low, &byte)) {
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block_tmp.value[i] = byte;
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} else {
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FURI_BIT_SET(block_unknown_bytes_mask, i);
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@ -15,7 +15,7 @@ bool hex_char_to_hex_nibble(char c, uint8_t* nibble) {
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}
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}
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bool hex_chars_to_uint8(char hi, char low, uint8_t* value) {
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bool hex_char_to_uint8(char hi, char low, uint8_t* value) {
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uint8_t hi_nibble_value, low_nibble_value;
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if(hex_char_to_hex_nibble(hi, &hi_nibble_value) &&
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@ -27,13 +27,29 @@ bool hex_chars_to_uint8(char hi, char low, uint8_t* value) {
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}
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}
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bool hex_chars_to_uint8(const char* value_str, uint8_t* value) {
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bool parse_success = false;
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while(*value_str && value_str[1]) {
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parse_success = hex_char_to_uint8(*value_str, value_str[1], value++);
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if(!parse_success) break;
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value_str += 2;
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}
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return parse_success;
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}
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bool hex_chars_to_uint64(const char* value_str, uint64_t* value) {
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uint8_t* _value = (uint8_t*)value;
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bool parse_success = false;
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for(uint8_t i = 0; i < 8; i++) {
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parse_success = hex_chars_to_uint8(value_str[i * 2], value_str[i * 2 + 1], &_value[7 - i]);
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parse_success = hex_char_to_uint8(value_str[i * 2], value_str[i * 2 + 1], &_value[7 - i]);
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if(!parse_success) break;
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}
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return parse_success;
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}
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void uint8_to_hex_chars(const uint8_t* src, uint8_t* target, int length) {
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const char chars[] = "0123456789ABCDEF";
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while(--length >= 0)
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target[length] = chars[(src[length >> 1] >> ((1 - (length & 1)) << 2)) & 0xF];
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}
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@ -14,14 +14,22 @@ extern "C" {
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*/
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bool hex_char_to_hex_nibble(char c, uint8_t* nibble);
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/** Convert ASCII hex values to byte
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/** Convert ASCII hex value to byte
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* @param hi hi nibble text
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* @param low low nibble text
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* @param value output value
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*
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* @return bool conversion status
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*/
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bool hex_chars_to_uint8(char hi, char low, uint8_t* value);
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bool hex_char_to_uint8(char hi, char low, uint8_t* value);
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/** Convert ASCII hex values to uint8_t
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* @param value_str ASCII data
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* @param value output value
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*
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* @return bool conversion status
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*/
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bool hex_chars_to_uint8(const char* value_str, uint8_t* value);
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/** Convert ASCII hex values to uint64_t
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* @param value_str ASCII 64 bi data
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@ -31,6 +39,14 @@ bool hex_chars_to_uint8(char hi, char low, uint8_t* value);
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*/
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bool hex_chars_to_uint64(const char* value_str, uint64_t* value);
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/** Convert uint8_t to ASCII hex values
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* @param src source data
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* @param target output value
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* @param length data length
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*
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*/
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void uint8_to_hex_chars(const uint8_t* src, uint8_t* target, int length);
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#ifdef __cplusplus
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}
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#endif
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