From 10b0a611cff79cd50fd8bce53fce5adc767a5cf4 Mon Sep 17 00:00:00 2001 From: Sebastian Mauer Date: Fri, 2 Sep 2022 12:15:34 +0100 Subject: [PATCH] Add support for Gallagher tags (#1680) * Add Gallagher protocol --- lib/lfrfid/protocols/lfrfid_protocols.c | 2 + lib/lfrfid/protocols/lfrfid_protocols.h | 1 + lib/lfrfid/protocols/protocol_gallagher.c | 300 ++++++++++++++++++++++ lib/lfrfid/protocols/protocol_gallagher.h | 4 + 4 files changed, 307 insertions(+) create mode 100644 lib/lfrfid/protocols/protocol_gallagher.c create mode 100644 lib/lfrfid/protocols/protocol_gallagher.h diff --git a/lib/lfrfid/protocols/lfrfid_protocols.c b/lib/lfrfid/protocols/lfrfid_protocols.c index fc658610..3d142969 100644 --- a/lib/lfrfid/protocols/lfrfid_protocols.c +++ b/lib/lfrfid/protocols/lfrfid_protocols.c @@ -13,6 +13,7 @@ #include "protocol_jablotron.h" #include "protocol_paradox.h" #include "protocol_pac_stanley.h" +#include "protocol_gallagher.h" const ProtocolBase* lfrfid_protocols[] = { [LFRFIDProtocolEM4100] = &protocol_em4100, @@ -29,4 +30,5 @@ const ProtocolBase* lfrfid_protocols[] = { [LFRFIDProtocolJablotron] = &protocol_jablotron, [LFRFIDProtocolParadox] = &protocol_paradox, [LFRFIDProtocolPACStanley] = &protocol_pac_stanley, + [LFRFIDProtocolGallagher] = &protocol_gallagher, }; \ No newline at end of file diff --git a/lib/lfrfid/protocols/lfrfid_protocols.h b/lib/lfrfid/protocols/lfrfid_protocols.h index 210ddd15..20b784dc 100644 --- a/lib/lfrfid/protocols/lfrfid_protocols.h +++ b/lib/lfrfid/protocols/lfrfid_protocols.h @@ -22,6 +22,7 @@ typedef enum { LFRFIDProtocolJablotron, LFRFIDProtocolParadox, LFRFIDProtocolPACStanley, + LFRFIDProtocolGallagher, LFRFIDProtocolMax, } LFRFIDProtocol; diff --git a/lib/lfrfid/protocols/protocol_gallagher.c b/lib/lfrfid/protocols/protocol_gallagher.c new file mode 100644 index 00000000..c205ab8a --- /dev/null +++ b/lib/lfrfid/protocols/protocol_gallagher.c @@ -0,0 +1,300 @@ +#include +#include +#include +#include +#include "lfrfid_protocols.h" + +#define GALLAGHER_CLOCK_PER_BIT (32) + +#define GALLAGHER_ENCODED_BIT_SIZE (96) +#define GALLAGHER_ENCODED_BYTE_SIZE ((GALLAGHER_ENCODED_BIT_SIZE) / 8) +#define GALLAGHER_PREAMBLE_BIT_SIZE (16) +#define GALLAGHER_PREAMBLE_BYTE_SIZE ((GALLAGHER_PREAMBLE_BIT_SIZE) / 8) +#define GALLAGHER_ENCODED_BYTE_FULL_SIZE \ + (GALLAGHER_ENCODED_BYTE_SIZE + GALLAGHER_PREAMBLE_BYTE_SIZE) +#define GALLAGHER_DECODED_DATA_SIZE 8 + +#define GALLAGHER_READ_SHORT_TIME (128) +#define GALLAGHER_READ_LONG_TIME (256) +#define GALLAGHER_READ_JITTER_TIME (60) + +#define GALLAGHER_READ_SHORT_TIME_LOW (GALLAGHER_READ_SHORT_TIME - GALLAGHER_READ_JITTER_TIME) +#define GALLAGHER_READ_SHORT_TIME_HIGH (GALLAGHER_READ_SHORT_TIME + GALLAGHER_READ_JITTER_TIME) +#define GALLAGHER_READ_LONG_TIME_LOW (GALLAGHER_READ_LONG_TIME - GALLAGHER_READ_JITTER_TIME) +#define GALLAGHER_READ_LONG_TIME_HIGH (GALLAGHER_READ_LONG_TIME + GALLAGHER_READ_JITTER_TIME) + +typedef struct { + uint8_t data[GALLAGHER_DECODED_DATA_SIZE]; + uint8_t encoded_data[GALLAGHER_ENCODED_BYTE_FULL_SIZE]; + + uint8_t encoded_data_index; + bool encoded_polarity; + + ManchesterState decoder_manchester_state; +} ProtocolGallagher; + +ProtocolGallagher* protocol_gallagher_alloc(void) { + ProtocolGallagher* proto = malloc(sizeof(ProtocolGallagher)); + return (void*)proto; +}; + +void protocol_gallagher_free(ProtocolGallagher* protocol) { + free(protocol); +}; + +uint8_t* protocol_gallagher_get_data(ProtocolGallagher* protocol) { + return protocol->data; +}; + +static void protocol_gallagher_scramble(uint8_t* data, size_t length) { + const uint8_t lut[] = { + 0xa3, 0xb0, 0x80, 0xc6, 0xb2, 0xf4, 0x5c, 0x6c, 0x81, 0xf1, 0xbb, 0xeb, 0x55, 0x67, 0x3c, + 0x05, 0x1a, 0x0e, 0x61, 0xf6, 0x22, 0xce, 0xaa, 0x8f, 0xbd, 0x3b, 0x1f, 0x5e, 0x44, 0x04, + 0x51, 0x2e, 0x4d, 0x9a, 0x84, 0xea, 0xf8, 0x66, 0x74, 0x29, 0x7f, 0x70, 0xd8, 0x31, 0x7a, + 0x6d, 0xa4, 0x00, 0x82, 0xb9, 0x5f, 0xb4, 0x16, 0xab, 0xff, 0xc2, 0x39, 0xdc, 0x19, 0x65, + 0x57, 0x7c, 0x20, 0xfa, 0x5a, 0x49, 0x13, 0xd0, 0xfb, 0xa8, 0x91, 0x73, 0xb1, 0x33, 0x18, + 0xbe, 0x21, 0x72, 0x48, 0xb6, 0xdb, 0xa0, 0x5d, 0xcc, 0xe6, 0x17, 0x27, 0xe5, 0xd4, 0x53, + 0x42, 0xf3, 0xdd, 0x7b, 0x24, 0xac, 0x2b, 0x58, 0x1e, 0xa7, 0xe7, 0x86, 0x40, 0xd3, 0x98, + 0x97, 0x71, 0xcb, 0x3a, 0x0f, 0x01, 0x9b, 0x6e, 0x1b, 0xfc, 0x34, 0xa6, 0xda, 0x07, 0x0c, + 0xae, 0x37, 0xca, 0x54, 0xfd, 0x26, 0xfe, 0x0a, 0x45, 0xa2, 0x2a, 0xc4, 0x12, 0x0d, 0xf5, + 0x4f, 0x69, 0xe0, 0x8a, 0x77, 0x60, 0x3f, 0x99, 0x95, 0xd2, 0x38, 0x36, 0x62, 0xb7, 0x32, + 0x7e, 0x79, 0xc0, 0x46, 0x93, 0x2f, 0xa5, 0xba, 0x5b, 0xaf, 0x52, 0x1d, 0xc3, 0x75, 0xcf, + 0xd6, 0x4c, 0x83, 0xe8, 0x3d, 0x30, 0x4e, 0xbc, 0x08, 0x2d, 0x09, 0x06, 0xd9, 0x25, 0x9e, + 0x89, 0xf2, 0x96, 0x88, 0xc1, 0x8c, 0x94, 0x0b, 0x28, 0xf0, 0x47, 0x63, 0xd5, 0xb3, 0x68, + 0x56, 0x9c, 0xf9, 0x6f, 0x41, 0x50, 0x85, 0x8b, 0x9d, 0x59, 0xbf, 0x9f, 0xe2, 0x8e, 0x6a, + 0x11, 0x23, 0xa1, 0xcd, 0xb5, 0x7d, 0xc7, 0xa9, 0xc8, 0xef, 0xdf, 0x02, 0xb8, 0x03, 0x6b, + 0x35, 0x3e, 0x2c, 0x76, 0xc9, 0xde, 0x1c, 0x4b, 0xd1, 0xed, 0x14, 0xc5, 0xad, 0xe9, 0x64, + 0x4a, 0xec, 0x8d, 0xf7, 0x10, 0x43, 0x78, 0x15, 0x87, 0xe4, 0xd7, 0x92, 0xe1, 0xee, 0xe3, + 0x90}; + for(size_t i = 0; i < length; i++) { + data[i] = lut[data[i]]; + } +} + +static void protocol_gallagher_descramble(uint8_t* data, size_t length) { + const uint8_t lut[] = { + 0x2f, 0x6e, 0xdd, 0xdf, 0x1d, 0x0f, 0xb0, 0x76, 0xad, 0xaf, 0x7f, 0xbb, 0x77, 0x85, 0x11, + 0x6d, 0xf4, 0xd2, 0x84, 0x42, 0xeb, 0xf7, 0x34, 0x55, 0x4a, 0x3a, 0x10, 0x71, 0xe7, 0xa1, + 0x62, 0x1a, 0x3e, 0x4c, 0x14, 0xd3, 0x5e, 0xb2, 0x7d, 0x56, 0xbc, 0x27, 0x82, 0x60, 0xe3, + 0xae, 0x1f, 0x9b, 0xaa, 0x2b, 0x95, 0x49, 0x73, 0xe1, 0x92, 0x79, 0x91, 0x38, 0x6c, 0x19, + 0x0e, 0xa9, 0xe2, 0x8d, 0x66, 0xc7, 0x5a, 0xf5, 0x1c, 0x80, 0x99, 0xbe, 0x4e, 0x41, 0xf0, + 0xe8, 0xa6, 0x20, 0xab, 0x87, 0xc8, 0x1e, 0xa0, 0x59, 0x7b, 0x0c, 0xc3, 0x3c, 0x61, 0xcc, + 0x40, 0x9e, 0x06, 0x52, 0x1b, 0x32, 0x8c, 0x12, 0x93, 0xbf, 0xef, 0x3b, 0x25, 0x0d, 0xc2, + 0x88, 0xd1, 0xe0, 0x07, 0x2d, 0x70, 0xc6, 0x29, 0x6a, 0x4d, 0x47, 0x26, 0xa3, 0xe4, 0x8b, + 0xf6, 0x97, 0x2c, 0x5d, 0x3d, 0xd7, 0x96, 0x28, 0x02, 0x08, 0x30, 0xa7, 0x22, 0xc9, 0x65, + 0xf8, 0xb7, 0xb4, 0x8a, 0xca, 0xb9, 0xf2, 0xd0, 0x17, 0xff, 0x46, 0xfb, 0x9a, 0xba, 0x8f, + 0xb6, 0x69, 0x68, 0x8e, 0x21, 0x6f, 0xc4, 0xcb, 0xb3, 0xce, 0x51, 0xd4, 0x81, 0x00, 0x2e, + 0x9c, 0x74, 0x63, 0x45, 0xd9, 0x16, 0x35, 0x5f, 0xed, 0x78, 0x9f, 0x01, 0x48, 0x04, 0xc1, + 0x33, 0xd6, 0x4f, 0x94, 0xde, 0x31, 0x9d, 0x0a, 0xac, 0x18, 0x4b, 0xcd, 0x98, 0xb8, 0x37, + 0xa2, 0x83, 0xec, 0x03, 0xd8, 0xda, 0xe5, 0x7a, 0x6b, 0x53, 0xd5, 0x15, 0xa4, 0x43, 0xe9, + 0x90, 0x67, 0x58, 0xc0, 0xa5, 0xfa, 0x2a, 0xb1, 0x75, 0x50, 0x39, 0x5c, 0xe6, 0xdc, 0x89, + 0xfc, 0xcf, 0xfe, 0xf9, 0x57, 0x54, 0x64, 0xa8, 0xee, 0x23, 0x0b, 0xf1, 0xea, 0xfd, 0xdb, + 0xbd, 0x09, 0xb5, 0x5b, 0x05, 0x86, 0x13, 0xf3, 0x24, 0xc5, 0x3f, 0x44, 0x72, 0x7c, 0x7e, + 0x36}; + + for(size_t i = 0; i < length; i++) { + data[i] = lut[data[i]]; + } +} + +static void protocol_gallagher_decode(ProtocolGallagher* protocol) { + bit_lib_remove_bit_every_nth(protocol->encoded_data, 16, 9 * 8, 9); + protocol_gallagher_descramble(protocol->encoded_data + 2, 8); + + // Region code + bit_lib_set_bits(protocol->data, 0, (protocol->encoded_data[5] & 0x1E) >> 1, 4); + + // Issue Level + bit_lib_set_bits(protocol->data, 4, (protocol->encoded_data[9] & 0x0F), 4); + + // Facility Code + uint32_t fc = (protocol->encoded_data[7] & 0x0F) << 12 | protocol->encoded_data[3] << 4 | + ((protocol->encoded_data[9] >> 4) & 0x0F); + protocol->data[3] = (uint8_t)fc; + protocol->data[2] = (uint8_t)(fc >>= 8); + protocol->data[1] = (uint8_t)(fc >>= 8); + + // Card Number + uint32_t card = protocol->encoded_data[2] << 16 | (protocol->encoded_data[6] & 0x1F) << 11 | + protocol->encoded_data[4] << 3 | (protocol->encoded_data[5] & 0xE0) >> 5; + protocol->data[7] = (uint8_t)card; + protocol->data[6] = (uint8_t)(card >>= 8); + protocol->data[5] = (uint8_t)(card >>= 8); + protocol->data[4] = (uint8_t)(card >>= 8); +} + +static bool protocol_gallagher_can_be_decoded(ProtocolGallagher* protocol) { + // check 16 bits preamble + if(bit_lib_get_bits_16(protocol->encoded_data, 0, 16) != 0b0111111111101010) return false; + + // check next 16 bits preamble + if(bit_lib_get_bits_16(protocol->encoded_data, 96, 16) != 0b0111111111101010) return false; + + uint8_t checksum_arr[8] = {0}; + for(int i = 0, pos = 0; i < 8; i++) { + // Following the preamble, every 9th bit is a checksum-bit for the preceding byte + pos = 16 + (9 * i); + checksum_arr[i] = bit_lib_get_bits(protocol->encoded_data, pos, 8); + } + uint8_t crc = bit_lib_get_bits(protocol->encoded_data, 16 + (9 * 8), 8); + uint8_t calc_crc = bit_lib_crc8(checksum_arr, 8, 0x7, 0x2c, false, false, 0x00); + + // crc + if(crc != calc_crc) return false; + + return true; +} + +void protocol_gallagher_decoder_start(ProtocolGallagher* protocol) { + memset(protocol->encoded_data, 0, GALLAGHER_ENCODED_BYTE_FULL_SIZE); + manchester_advance( + protocol->decoder_manchester_state, + ManchesterEventReset, + &protocol->decoder_manchester_state, + NULL); +}; + +bool protocol_gallagher_decoder_feed(ProtocolGallagher* protocol, bool level, uint32_t duration) { + bool result = false; + + ManchesterEvent event = ManchesterEventReset; + + if(duration > GALLAGHER_READ_SHORT_TIME_LOW && duration < GALLAGHER_READ_SHORT_TIME_HIGH) { + if(!level) { + event = ManchesterEventShortHigh; + } else { + event = ManchesterEventShortLow; + } + } else if(duration > GALLAGHER_READ_LONG_TIME_LOW && duration < GALLAGHER_READ_LONG_TIME_HIGH) { + if(!level) { + event = ManchesterEventLongHigh; + } else { + event = ManchesterEventLongLow; + } + } + + if(event != ManchesterEventReset) { + bool data; + bool data_ok = manchester_advance( + protocol->decoder_manchester_state, event, &protocol->decoder_manchester_state, &data); + + if(data_ok) { + bit_lib_push_bit(protocol->encoded_data, GALLAGHER_ENCODED_BYTE_FULL_SIZE, data); + + if(protocol_gallagher_can_be_decoded(protocol)) { + protocol_gallagher_decode(protocol); + result = true; + } + } + } + + return result; +}; + +bool protocol_gallagher_encoder_start(ProtocolGallagher* protocol) { + // Preamble + bit_lib_set_bits(protocol->encoded_data, 0, 0b01111111, 8); + bit_lib_set_bits(protocol->encoded_data, 8, 0b11101010, 8); + + uint8_t rc = bit_lib_get_bits(protocol->data, 0, 4); + uint8_t il = bit_lib_get_bits(protocol->data, 4, 4); + uint32_t fc = bit_lib_get_bits_32(protocol->data, 8, 24); + uint32_t cn = bit_lib_get_bits_32(protocol->data, 32, 32); + + uint8_t payload[8] = {0}; + payload[0] = (cn & 0xffffff) >> 16; + payload[1] = (fc & 0xfff) >> 4; + payload[2] = (cn & 0x7ff) >> 3; + payload[3] = (cn & 0x7) << 5 | (rc & 0xf) << 1; + payload[4] = (cn & 0xffff) >> 11; + payload[5] = (fc & 0xffff) >> 12; + payload[6] = 0; + payload[7] = (fc & 0xf) << 4 | (il & 0xf); + + // Gallagher scramble + protocol_gallagher_scramble(payload, 8); + + for(int i = 0; i < 8; i++) { + // data byte + bit_lib_set_bits(protocol->encoded_data, 16 + (i * 9), payload[i], 8); + + // every byte is followed by a bit which is the inverse of the last bit + bit_lib_set_bit(protocol->encoded_data, 16 + (i * 9) + 8, !(payload[i] & 0x1)); + } + + // checksum + uint8_t crc = bit_lib_crc8(payload, 8, 0x7, 0x2c, false, false, 0x00); + bit_lib_set_bits(protocol->encoded_data, 16 + (9 * 8), crc, 8); + + return true; +}; + +LevelDuration protocol_gallagher_encoder_yield(ProtocolGallagher* protocol) { + bool level = bit_lib_get_bit(protocol->encoded_data, protocol->encoded_data_index); + uint32_t duration = GALLAGHER_CLOCK_PER_BIT / 2; + + if(protocol->encoded_polarity) { + protocol->encoded_polarity = false; + } else { + level = !level; + + protocol->encoded_polarity = true; + bit_lib_increment_index(protocol->encoded_data_index, GALLAGHER_ENCODED_BIT_SIZE); + } + + return level_duration_make(level, duration); +}; + +bool protocol_gallagher_write_data(ProtocolGallagher* protocol, void* data) { + LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data; + bool result = false; + + protocol_gallagher_encoder_start(protocol); + + if(request->write_type == LFRFIDWriteTypeT5577) { + request->t5577.block[0] = + (LFRFID_T5577_MODULATION_MANCHESTER | LFRFID_T5577_BITRATE_RF_32 | + (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; +}; + +void protocol_gallagher_render_data(ProtocolGallagher* protocol, string_t result) { + UNUSED(protocol); + uint8_t rc = bit_lib_get_bits(protocol->data, 0, 4); + uint8_t il = bit_lib_get_bits(protocol->data, 4, 4); + uint32_t fc = bit_lib_get_bits_32(protocol->data, 8, 24); + uint32_t card_id = bit_lib_get_bits_32(protocol->data, 32, 32); + + string_cat_printf(result, "Region: %u, Issue Level: %u\r\n", rc, il); + string_cat_printf(result, "FC: %u, C: %lu\r\n", fc, card_id); +}; + +const ProtocolBase protocol_gallagher = { + .name = "Gallagher", + .manufacturer = "Gallagher", + .data_size = GALLAGHER_DECODED_DATA_SIZE, + .features = LFRFIDFeatureASK, + .validate_count = 3, + .alloc = (ProtocolAlloc)protocol_gallagher_alloc, + .free = (ProtocolFree)protocol_gallagher_free, + .get_data = (ProtocolGetData)protocol_gallagher_get_data, + .decoder = + { + .start = (ProtocolDecoderStart)protocol_gallagher_decoder_start, + .feed = (ProtocolDecoderFeed)protocol_gallagher_decoder_feed, + }, + .encoder = + { + .start = (ProtocolEncoderStart)protocol_gallagher_encoder_start, + .yield = (ProtocolEncoderYield)protocol_gallagher_encoder_yield, + }, + .render_data = (ProtocolRenderData)protocol_gallagher_render_data, + .render_brief_data = (ProtocolRenderData)protocol_gallagher_render_data, + .write_data = (ProtocolWriteData)protocol_gallagher_write_data, +}; \ No newline at end of file diff --git a/lib/lfrfid/protocols/protocol_gallagher.h b/lib/lfrfid/protocols/protocol_gallagher.h new file mode 100644 index 00000000..2d922f60 --- /dev/null +++ b/lib/lfrfid/protocols/protocol_gallagher.h @@ -0,0 +1,4 @@ +#pragma once +#include + +extern const ProtocolBase protocol_gallagher; \ No newline at end of file