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Merge pull request #750 from DarkFlippers/electra
Electra intercom lfrfid protocol
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a8dcec0dad
@ -1,5 +1,6 @@
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#include "lfrfid_protocols.h"
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#include "protocol_em4100.h"
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#include "protocol_electra.h"
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#include "protocol_h10301.h"
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#include "protocol_idteck.h"
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#include "protocol_indala26.h"
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@ -22,6 +23,7 @@ const ProtocolBase* lfrfid_protocols[] = {
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[LFRFIDProtocolEM4100] = &protocol_em4100,
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[LFRFIDProtocolEM4100_32] = &protocol_em4100_32,
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[LFRFIDProtocolEM4100_16] = &protocol_em4100_16,
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[LFRFIDProtocolElectra] = &protocol_electra,
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[LFRFIDProtocolH10301] = &protocol_h10301,
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[LFRFIDProtocolIdteck] = &protocol_idteck,
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[LFRFIDProtocolIndala26] = &protocol_indala26,
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@ -11,6 +11,7 @@ typedef enum {
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LFRFIDProtocolEM4100,
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LFRFIDProtocolEM4100_32,
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LFRFIDProtocolEM4100_16,
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LFRFIDProtocolElectra,
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LFRFIDProtocolH10301,
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LFRFIDProtocolIdteck,
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LFRFIDProtocolIndala26,
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439
lib/lfrfid/protocols/protocol_electra.c
Normal file
439
lib/lfrfid/protocols/protocol_electra.c
Normal file
@ -0,0 +1,439 @@
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/*
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* Electra intercom rfid protocol (Romania)
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*
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* Based on EM4100 protocol implementation from https://github.com/flipperdevices/flipperzero-firmware/blob/dev/lib/lfrfid/protocols/protocol_em4100.c
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*
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* Copyright 2024 Leptoptilos <leptoptilos@icloud.com>
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* ------------------------------------------------------------------------------------------------------------------------------
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* PROTOCOL DESCRIPTION:
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* ------------------------------------------------------------------------------------------------------------------------------
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* Electra intercom 125 kHz protocol based on 64-bit clock EM4100, but includes some extra data after base EM4100 data (epilogue)
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*
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* Epilogue size is 64 bits, but only first 16 bits matter. Rest 6 bytes - some filler data,
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* that arbitrary change is not validated by the Electra intercoms
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*
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* There are curently three known types of epilogue:
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* - 0x7E71AAAAAAAAAAAA (AA filler)
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* - 0x7E71000000000000 (00 filler)
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* - 0x0030AAAAAAAAAAAA
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*
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* First two epilogue bytes may be interpreted as EM4100 data continuation
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* Nevertheless, these bytes have correct row parity bits, but have not correct collumn parity
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* For example: 0x7E71AAAAAAAAAAAA epilogue:
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*
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* In binary: | 0b01111110 | 01110001 | 10101010 | 10101010 | 10101010 | 10101010 | 10101010 | 10101010 |
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* In hex: | 0x7E | 71 | AA | AA | AA | AA | AA | AA |
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*
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* As EM4100 data:
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* 0111 1 // 7
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* 1100 0 // C
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* 0111 1 // 7
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* 1101 0 // here epilogue filler starts (from second bit)
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* 1010 1 // there is no correct raw parity bits anymore
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* 0101 0
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* 1010 1
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* 0101 0
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* 1010 // and no correct column parity
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*/
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#include "bit_lib/bit_lib.h"
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#include <furi.h>
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#include <stdlib.h>
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#include <toolbox/protocols/protocol.h>
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#include <toolbox/manchester_decoder.h>
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#include "lfrfid_protocols.h"
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#define TAG "ELECTRA"
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typedef uint64_t ElectraDecodedData;
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#define EM_HEADER_POS (55)
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#define EM_HEADER_MASK (0x1FFLLU << EM_HEADER_POS)
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#define EM_FIRST_ROW_POS (50)
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#define EM_ROW_COUNT (10)
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#define EM_COLUMN_COUNT (4)
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#define EM_BITS_PER_ROW_COUNT (EM_COLUMN_COUNT + 1)
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#define EM_COLUMN_POS (4)
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#define ELECTRA_STOP_POS (0)
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#define ELECTRA_STOP_MASK (0x1LLU << ELECTRA_STOP_POS)
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#define EM_HEADER_AND_STOP_MASK (EM_HEADER_MASK | ELECTRA_STOP_MASK)
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#define EM_HEADER_AND_STOP_DATA (EM_HEADER_MASK)
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#define ELECTRA_DECODED_BASE_DATA_SIZE (5)
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#define ELECTRA_ENCODED_BASE_DATA_SIZE (sizeof(ElectraDecodedData))
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#define ELECTRA_DECODED_EPILOGUE_SIZE (3)
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#define ELECTRA_ENCODED_EPILOGUE_SIZE (sizeof(ElectraDecodedData))
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#define ELECTRA_DECODED_DATA_SIZE (ELECTRA_DECODED_BASE_DATA_SIZE + ELECTRA_DECODED_EPILOGUE_SIZE)
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#define ELECTRA_ENCODED_DATA_SIZE (ELECTRA_ENCODED_BASE_DATA_SIZE + ELECTRA_ENCODED_EPILOGUE_SIZE)
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#define ELECTRA_DECODED_DATA_EPILOGUE_START_POS (ELECTRA_DECODED_BASE_DATA_SIZE)
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#define ELECTRA_CLOCK_PER_BIT (64)
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#define ELECTRA_READ_SHORT_TIME (256)
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#define ELECTRA_READ_LONG_TIME (512)
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#define ELECTRA_READ_JITTER_TIME (100)
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#define ELECTRA_READ_SHORT_TIME_LOW (ELECTRA_READ_SHORT_TIME - ELECTRA_READ_JITTER_TIME)
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#define ELECTRA_READ_SHORT_TIME_HIGH (ELECTRA_READ_SHORT_TIME + ELECTRA_READ_JITTER_TIME)
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#define ELECTRA_READ_LONG_TIME_LOW (ELECTRA_READ_LONG_TIME - ELECTRA_READ_JITTER_TIME)
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#define ELECTRA_READ_LONG_TIME_HIGH (ELECTRA_READ_LONG_TIME + ELECTRA_READ_JITTER_TIME)
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#define EM_ENCODED_DATA_HEADER (0xFF80000000000000ULL)
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typedef struct {
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uint8_t data[ELECTRA_DECODED_DATA_SIZE];
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ElectraDecodedData encoded_base_data;
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ElectraDecodedData encoded_epilogue;
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uint8_t encoded_data_index;
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bool encoded_polarity;
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ManchesterState decoder_manchester_state;
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} ProtocolElectra;
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ProtocolElectra* protocol_electra_alloc(void) {
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ProtocolElectra* proto = malloc(sizeof(ProtocolElectra));
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return (void*)proto;
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};
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void protocol_electra_free(ProtocolElectra* proto) {
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free(proto);
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};
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uint8_t* protocol_electra_get_data(ProtocolElectra* proto) {
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return proto->data;
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};
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static void electra_decode(
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const uint8_t* encoded_base_data,
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const uint8_t encoded_base_data_size,
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const uint8_t* encoded_epilogue,
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const uint8_t encoded_epilogue_size,
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uint8_t* decoded_data,
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const uint8_t decoded_data_size) {
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furi_check(decoded_data_size >= ELECTRA_DECODED_DATA_SIZE);
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furi_check(encoded_base_data_size >= ELECTRA_ENCODED_BASE_DATA_SIZE);
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furi_check(encoded_epilogue_size >= ELECTRA_ENCODED_EPILOGUE_SIZE);
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uint8_t decoded_data_index = 0;
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ElectraDecodedData base_data = *((ElectraDecodedData*)(encoded_base_data));
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//ElectraDecodedData epilogue = *((ElectraDecodedData*)(encoded_epilogue));
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// clean result
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memset(decoded_data, 0, decoded_data_size);
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// header
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for(uint8_t i = 0; i < 9; i++) {
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base_data = base_data << 1;
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}
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// nibbles
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uint8_t value = 0;
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for(uint8_t r = 0; r < EM_ROW_COUNT; r++) {
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uint8_t nibble = 0;
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for(uint8_t i = 0; i < 5; i++) {
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if(i < 4) nibble = (nibble << 1) | (base_data & (1LLU << 63) ? 1 : 0);
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base_data = base_data << 1;
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}
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value = (value << 4) | nibble;
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if(r % 2) {
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decoded_data[decoded_data_index] |= value;
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decoded_data_index++;
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value = 0;
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}
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}
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// copy first 3 bytes of encoded epilogue to decoded data
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decoded_data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS] =
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encoded_epilogue[ELECTRA_ENCODED_EPILOGUE_SIZE - 1];
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decoded_data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS + 1] =
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encoded_epilogue[ELECTRA_ENCODED_EPILOGUE_SIZE - 2];
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decoded_data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS + 2] =
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encoded_epilogue[ELECTRA_ENCODED_EPILOGUE_SIZE - 3];
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}
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static bool electra_can_be_decoded(
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const uint8_t* encoded_base_data,
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const uint8_t encoded_base_data_size,
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const uint8_t* encoded_epilogue_data,
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const uint8_t encoded_epilogue_data_size) {
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furi_check(encoded_base_data_size >= ELECTRA_ENCODED_BASE_DATA_SIZE);
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furi_check(encoded_epilogue_data_size >= ELECTRA_ENCODED_EPILOGUE_SIZE);
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const ElectraDecodedData* base_data = (ElectraDecodedData*)encoded_base_data;
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const ElectraDecodedData* epilogue = (ElectraDecodedData*)encoded_epilogue_data;
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// check electra epilogue. if em4100 header - break
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if((*epilogue & EM_ENCODED_DATA_HEADER) == EM_ENCODED_DATA_HEADER) return false;
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// check header and stop bit
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if((*base_data & EM_HEADER_AND_STOP_MASK) != EM_HEADER_AND_STOP_DATA) return false;
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// check row parity
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for(uint8_t i = 0; i < EM_ROW_COUNT; i++) {
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uint8_t parity_sum = 0;
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for(uint8_t j = 0; j < EM_BITS_PER_ROW_COUNT; j++) {
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parity_sum += (*base_data >> (EM_FIRST_ROW_POS - i * EM_BITS_PER_ROW_COUNT + j)) & 1;
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}
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if((parity_sum % 2)) {
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return false;
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}
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}
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// check columns parity
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for(uint8_t i = 0; i < EM_COLUMN_COUNT; i++) {
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uint8_t parity_sum = 0;
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for(uint8_t j = 0; j < EM_ROW_COUNT + 1; j++) {
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parity_sum += (*base_data >> (EM_COLUMN_POS - i + j * EM_BITS_PER_ROW_COUNT)) & 1;
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}
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if((parity_sum % 2)) {
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FURI_LOG_D(
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TAG,
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"Unexpected column parity found. EM4100 data: %016llX",
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bit_lib_bytes_to_num_be(encoded_base_data, encoded_base_data_size));
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return false;
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}
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}
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// encoded_epilogue_data lsb encoded
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uint8_t epilogue_filler = encoded_epilogue_data[(ELECTRA_ENCODED_EPILOGUE_SIZE - 1) - 2];
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for(uint8_t i = 0; i < ((ELECTRA_ENCODED_EPILOGUE_SIZE - 1) - 2); i++)
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if(encoded_epilogue_data[i] != epilogue_filler) {
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FURI_LOG_D(TAG, "Unexpected epilogue filler found: %016llX", *epilogue);
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return false;
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}
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return true;
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}
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void protocol_electra_decoder_start(ProtocolElectra* proto) {
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memset(proto->data, 0, ELECTRA_DECODED_DATA_SIZE);
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proto->encoded_base_data = 0;
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proto->encoded_epilogue = 0;
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manchester_advance(
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proto->decoder_manchester_state,
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ManchesterEventReset,
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&proto->decoder_manchester_state,
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NULL);
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};
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bool protocol_electra_decoder_feed(ProtocolElectra* proto, bool level, uint32_t duration) {
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bool result = false;
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ManchesterEvent event = ManchesterEventReset;
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if(duration > ELECTRA_READ_SHORT_TIME_LOW && duration < ELECTRA_READ_SHORT_TIME_HIGH) {
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if(!level) {
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event = ManchesterEventShortHigh;
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} else {
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event = ManchesterEventShortLow;
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}
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} else if(duration > ELECTRA_READ_LONG_TIME_LOW && duration < ELECTRA_READ_LONG_TIME_HIGH) {
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if(!level) {
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event = ManchesterEventLongHigh;
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} else {
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event = ManchesterEventLongLow;
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}
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}
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if(event != ManchesterEventReset) {
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bool data;
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bool data_ok = manchester_advance(
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proto->decoder_manchester_state, event, &proto->decoder_manchester_state, &data);
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if(data_ok) {
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/*
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EM 4100 BASE DATA (64 bit) ELECTRA EPILOGUE (64 bit)
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_________________________________ _________________________________
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | <- new data bit
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--------------------------------- ---------------------------------
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<- epilogue msb is carry bit to base data
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*/
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bool carry = proto->encoded_epilogue >> 63 & 0b1;
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proto->encoded_base_data = (proto->encoded_base_data << 1) | carry;
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proto->encoded_epilogue = (proto->encoded_epilogue << 1) | data;
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if(electra_can_be_decoded(
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(uint8_t*)&proto->encoded_base_data,
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ELECTRA_ENCODED_BASE_DATA_SIZE,
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(uint8_t*)&proto->encoded_epilogue,
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ELECTRA_ENCODED_EPILOGUE_SIZE)) {
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electra_decode(
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(uint8_t*)&proto->encoded_base_data,
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ELECTRA_ENCODED_BASE_DATA_SIZE,
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(uint8_t*)&proto->encoded_epilogue,
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ELECTRA_ENCODED_EPILOGUE_SIZE,
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proto->data,
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ELECTRA_DECODED_DATA_SIZE);
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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 em_write_nibble(bool low_nibble, uint8_t data, ElectraDecodedData* encoded_base_data) {
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uint8_t parity_sum = 0;
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uint8_t start = 0;
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if(!low_nibble) start = 4;
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for(int8_t i = (start + 3); i >= start; i--) {
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parity_sum += (data >> i) & 1;
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*encoded_base_data = (*encoded_base_data << 1) | ((data >> i) & 1);
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}
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*encoded_base_data = (*encoded_base_data << 1) | ((parity_sum % 2) & 1);
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}
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bool protocol_electra_encoder_start(ProtocolElectra* proto) {
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// header
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proto->encoded_base_data = 0b111111111;
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// data
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for(uint8_t i = 0; i < ELECTRA_DECODED_BASE_DATA_SIZE; i++) {
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em_write_nibble(false, proto->data[i], &proto->encoded_base_data);
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em_write_nibble(true, proto->data[i], &proto->encoded_base_data);
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}
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// column parity and stop bit
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uint8_t parity_sum;
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for(uint8_t c = 0; c < EM_COLUMN_COUNT; c++) {
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parity_sum = 0;
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for(uint8_t i = 1; i <= EM_ROW_COUNT; i++) {
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uint8_t parity_bit = (proto->encoded_base_data >> (i * EM_BITS_PER_ROW_COUNT - 1)) & 1;
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parity_sum += parity_bit;
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}
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proto->encoded_base_data = (proto->encoded_base_data << 1) | ((parity_sum % 2) & 1);
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}
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// stop bit
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proto->encoded_base_data = (proto->encoded_base_data << 1) | 0;
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proto->encoded_data_index = 0;
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proto->encoded_polarity = true;
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// epilogue
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proto->encoded_epilogue = (proto->data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS]);
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proto->encoded_epilogue <<= 8;
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proto->encoded_epilogue |= (proto->data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS + 1]);
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//fill bytes 2-7 by epilogue filler
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for(uint8_t i = 2; i < ELECTRA_ENCODED_EPILOGUE_SIZE; i++) {
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proto->encoded_epilogue <<= 8;
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proto->encoded_epilogue |= proto->data[ELECTRA_DECODED_DATA_EPILOGUE_START_POS + 2];
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}
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return true;
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};
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LevelDuration protocol_electra_encoder_yield(ProtocolElectra* proto) {
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bool level;
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if(proto->encoded_data_index < 64)
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level = (proto->encoded_base_data >> (63 - proto->encoded_data_index)) & 1;
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else
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level = (proto->encoded_epilogue >> (63 - (proto->encoded_data_index - 64))) & 1;
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uint32_t duration = ELECTRA_CLOCK_PER_BIT / 2;
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if(proto->encoded_polarity) {
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proto->encoded_polarity = false;
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} else {
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level = !level;
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proto->encoded_polarity = true;
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proto->encoded_data_index++;
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if(proto->encoded_data_index >= 128) {
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proto->encoded_data_index = 0;
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}
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}
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return level_duration_make(level, duration);
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};
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bool protocol_electra_write_data(ProtocolElectra* 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_electra_encoder_start(protocol);
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||||
electra_decode(
|
||||
(uint8_t*)&protocol->encoded_base_data,
|
||||
sizeof(ElectraDecodedData),
|
||||
(uint8_t*)&protocol->encoded_epilogue,
|
||||
sizeof(ElectraDecodedData),
|
||||
protocol->data,
|
||||
ELECTRA_DECODED_DATA_SIZE);
|
||||
|
||||
protocol_electra_encoder_start(protocol);
|
||||
|
||||
if(request->write_type == LFRFIDWriteTypeT5577) {
|
||||
request->t5577.block[0] =
|
||||
(LFRFID_T5577_MODULATION_MANCHESTER | LFRFID_T5577_BITRATE_RF_64 |
|
||||
(4 << LFRFID_T5577_MAXBLOCK_SHIFT));
|
||||
request->t5577.block[1] = protocol->encoded_base_data >> 32;
|
||||
request->t5577.block[2] = protocol->encoded_base_data & 0xFFFFFFFF;
|
||||
request->t5577.block[3] = protocol->encoded_epilogue >> 32;
|
||||
request->t5577.block[4] = protocol->encoded_epilogue & 0xFFFFFFFF;
|
||||
request->t5577.blocks_to_write = 5;
|
||||
result = true;
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
void protocol_electra_render_data(ProtocolElectra* protocol, FuriString* result) {
|
||||
furi_string_printf(result, "Epilogue: %016llX", protocol->encoded_epilogue);
|
||||
};
|
||||
|
||||
const ProtocolBase protocol_electra = {
|
||||
.name = "Electra",
|
||||
.manufacturer = "Electra Group",
|
||||
.data_size = ELECTRA_DECODED_DATA_SIZE,
|
||||
.features = LFRFIDFeatureASK | LFRFIDFeaturePSK,
|
||||
.validate_count = 3,
|
||||
.alloc = (ProtocolAlloc)protocol_electra_alloc,
|
||||
.free = (ProtocolFree)protocol_electra_free,
|
||||
.get_data = (ProtocolGetData)protocol_electra_get_data,
|
||||
.decoder =
|
||||
{
|
||||
.start = (ProtocolDecoderStart)protocol_electra_decoder_start,
|
||||
.feed = (ProtocolDecoderFeed)protocol_electra_decoder_feed,
|
||||
},
|
||||
.encoder =
|
||||
{
|
||||
.start = (ProtocolEncoderStart)protocol_electra_encoder_start,
|
||||
.yield = (ProtocolEncoderYield)protocol_electra_encoder_yield,
|
||||
},
|
||||
.render_data = (ProtocolRenderData)protocol_electra_render_data,
|
||||
.render_brief_data = (ProtocolRenderData)protocol_electra_render_data,
|
||||
.write_data = (ProtocolWriteData)protocol_electra_write_data,
|
||||
};
|
||||
4
lib/lfrfid/protocols/protocol_electra.h
Normal file
4
lib/lfrfid/protocols/protocol_electra.h
Normal file
@ -0,0 +1,4 @@
|
||||
#pragma once
|
||||
#include <toolbox/protocols/protocol.h>
|
||||
|
||||
extern const ProtocolBase protocol_electra;
|
||||
@ -4,6 +4,7 @@
|
||||
#include "lfrfid_protocols.h"
|
||||
|
||||
typedef uint64_t EM4100DecodedData;
|
||||
typedef uint64_t EM4100Epilogue;
|
||||
|
||||
#define EM_HEADER_POS (55)
|
||||
#define EM_HEADER_MASK (0x1FFLLU << EM_HEADER_POS)
|
||||
@ -28,10 +29,13 @@ typedef uint64_t EM4100DecodedData;
|
||||
#define EM_READ_LONG_TIME_BASE (512)
|
||||
#define EM_READ_JITTER_TIME_BASE (100)
|
||||
|
||||
#define EM_ENCODED_DATA_HEADER (0xFF80000000000000ULL)
|
||||
|
||||
typedef struct {
|
||||
uint8_t data[EM4100_DECODED_DATA_SIZE];
|
||||
|
||||
EM4100DecodedData encoded_data;
|
||||
EM4100Epilogue encoded_epilogue;
|
||||
uint8_t encoded_data_index;
|
||||
bool encoded_polarity;
|
||||
|
||||
@ -147,9 +151,16 @@ static void em4100_decode(
|
||||
}
|
||||
}
|
||||
|
||||
static bool em4100_can_be_decoded(const uint8_t* encoded_data, const uint8_t encoded_data_size) {
|
||||
static bool em4100_can_be_decoded(
|
||||
const uint8_t* encoded_data,
|
||||
const uint8_t encoded_data_size,
|
||||
const uint8_t* encoded_epilogue) {
|
||||
furi_check(encoded_data_size >= EM4100_ENCODED_DATA_SIZE);
|
||||
const EM4100DecodedData* card_data = (EM4100DecodedData*)encoded_data;
|
||||
const EM4100Epilogue* epilogue = (EM4100Epilogue*)encoded_epilogue;
|
||||
|
||||
// check first 9 bytes on epilogue (to prevent conflict with Electra protocol)
|
||||
if((*epilogue & EM_ENCODED_DATA_HEADER) != EM_ENCODED_DATA_HEADER) return false;
|
||||
|
||||
// check header and stop bit
|
||||
if((*card_data & EM_HEADER_AND_STOP_MASK) != EM_HEADER_AND_STOP_DATA) return false;
|
||||
@ -221,9 +232,15 @@ bool protocol_em4100_decoder_feed(ProtocolEM4100* proto, bool level, uint32_t du
|
||||
proto->decoder_manchester_state, event, &proto->decoder_manchester_state, &data);
|
||||
|
||||
if(data_ok) {
|
||||
proto->encoded_data = (proto->encoded_data << 1) | data;
|
||||
bool carry = proto->encoded_epilogue >> 63 & 0b1;
|
||||
|
||||
if(em4100_can_be_decoded((uint8_t*)&proto->encoded_data, sizeof(EM4100DecodedData))) {
|
||||
proto->encoded_data = (proto->encoded_data << 1) | carry;
|
||||
proto->encoded_epilogue = (proto->encoded_epilogue << 1) | data;
|
||||
|
||||
if(em4100_can_be_decoded(
|
||||
(uint8_t*)&proto->encoded_data,
|
||||
sizeof(EM4100DecodedData),
|
||||
(uint8_t*)&proto->encoded_epilogue)) {
|
||||
em4100_decode(
|
||||
(uint8_t*)&proto->encoded_data,
|
||||
sizeof(EM4100DecodedData),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user