liz/flipperzero-firmware
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LF-RFID: add CRC calculation to paradox protocol (#2299)

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Co-authored-by: Angel <angel@Zoomies>
Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Angel 2023-01-29 06:23:45 -05:00 committed by GitHub
parent e12958d408
commit a8e5f22500
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 40 additions and 5 deletions
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45
lib/lfrfid/protocols/protocol_paradox.c
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@ -136,17 +136,45 @@ LevelDuration protocol_paradox_encoder_yield(ProtocolParadox* protocol) {
return level_duration_make(level, duration); return level_duration_make(level, duration);
}; };
static uint8_t protocol_paradox_calculate_checksum(uint8_t fc, uint16_t card_id) {
uint8_t card_hi = (card_id >> 8) & 0xff;
uint8_t card_lo = card_id & 0xff;
uint8_t arr[5] = {0, 0, fc, card_hi, card_lo};
uint8_t manchester[9];
bit_lib_push_bit(manchester, 9, false);
bit_lib_push_bit(manchester, 9, false);
bit_lib_push_bit(manchester, 9, false);
bit_lib_push_bit(manchester, 9, false);
for(uint8_t i = 6; i < 40; i += 1) {
if(bit_lib_get_bit(arr, i) == 0b1) {
bit_lib_push_bit(manchester, 9, true);
bit_lib_push_bit(manchester, 9, false);
} else {
bit_lib_push_bit(manchester, 9, false);
bit_lib_push_bit(manchester, 9, true);
}
}
uint8_t output = bit_lib_crc8(manchester, 9, 0x31, 0x00, true, true, 0x06);
return output;
}
void protocol_paradox_render_data(ProtocolParadox* protocol, FuriString* result) { void protocol_paradox_render_data(ProtocolParadox* protocol, FuriString* result) {
uint8_t* decoded_data = protocol->data; uint8_t* decoded_data = protocol->data;
uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8); uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8);
uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16); uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16);
uint8_t card_crc = bit_lib_get_bits_16(decoded_data, 34, 8);
uint8_t calc_crc = protocol_paradox_calculate_checksum(fc, card_id);
furi_string_cat_printf(result, "Facility: %u\r\n", fc); furi_string_cat_printf(result, "Facility: %u\r\n", fc);
furi_string_cat_printf(result, "Card: %u\r\n", card_id); furi_string_cat_printf(result, "Card: %u\r\n", card_id);
furi_string_cat_printf(result, "Data: "); furi_string_cat_printf(result, "CRC: %u Calc CRC: %u\r\n", card_crc, calc_crc);
for(size_t i = 0; i < PARADOX_DECODED_DATA_SIZE; i++) { if(card_crc != calc_crc) furi_string_cat_printf(result, "CRC Mismatch, Invalid Card!\r\n");
furi_string_cat_printf(result, "%02X", decoded_data[i]);
}
}; };
void protocol_paradox_render_brief_data(ProtocolParadox* protocol, FuriString* result) { void protocol_paradox_render_brief_data(ProtocolParadox* protocol, FuriString* result) {
@ -154,8 +182,15 @@ void protocol_paradox_render_brief_data(ProtocolParadox* protocol, FuriString* r
uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8); uint8_t fc = bit_lib_get_bits(decoded_data, 10, 8);
uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16); uint16_t card_id = bit_lib_get_bits_16(decoded_data, 18, 16);
uint8_t card_crc = bit_lib_get_bits_16(decoded_data, 34, 8);
uint8_t calc_crc = protocol_paradox_calculate_checksum(fc, card_id);
furi_string_cat_printf(result, "FC: %03u, Card: %05u", fc, card_id); furi_string_cat_printf(result, "FC: %03u, Card: %05u\r\n", fc, card_id);
if(calc_crc == card_crc) {
furi_string_cat_printf(result, "CRC : %03u", card_crc);
} else {
furi_string_cat_printf(result, "Card is Invalid!");
}
}; };
bool protocol_paradox_write_data(ProtocolParadox* protocol, void* data) { bool protocol_paradox_write_data(ProtocolParadox* protocol, void* data) {