LFRFID: Noralsy Format/Brand

lib/lfrfid/protocols/lfrfid_protocols.c

@@ -20,6 +20,7 @@
 #include "protocol_nexwatch.h"
 #include "protocol_securakey.h"
 #include "protocol_gproxii.h"
+#include "protocol_noralsy.h"
 
 const ProtocolBase* lfrfid_protocols[] = {
     [LFRFIDProtocolEM4100] = &protocol_em4100,
@@ -45,4 +46,5 @@ const ProtocolBase* lfrfid_protocols[] = {
     [LFRFIDProtocolNexwatch] = &protocol_nexwatch,
     [LFRFIDProtocolSecurakey] = &protocol_securakey,
     [LFRFIDProtocolGProxII] = &protocol_gproxii,
+    [LFRFIDProtocolNoralsy] = &protocol_noralsy,
 };

lib/lfrfid/protocols/lfrfid_protocols.h

@@ -32,6 +32,7 @@ typedef enum {
     LFRFIDProtocolNexwatch,
     LFRFIDProtocolSecurakey,
     LFRFIDProtocolGProxII,
+    LFRFIDProtocolNoralsy,
 
     LFRFIDProtocolMax,
 } LFRFIDProtocol;

lib/lfrfid/protocols/protocol_noralsy.c

@@ -0,0 +1,233 @@
+#include <furi.h>
+#include <toolbox/protocols/protocol.h>
+#include <toolbox/manchester_decoder.h>
+#include <bit_lib/bit_lib.h>
+#include "lfrfid_protocols.h"
+
+#define NORALSY_CLOCK_PER_BIT (32)
+
+#define NORALSY_ENCODED_BIT_SIZE       (96)
+#define NORALSY_ENCODED_BYTE_SIZE      ((NORALSY_ENCODED_BIT_SIZE) / 8)
+#define NORALSY_PREAMBLE_BIT_SIZE      (32)
+#define NORALSY_PREAMBLE_BYTE_SIZE     ((NORALSY_PREAMBLE_BIT_SIZE) / 8)
+#define NORALSY_ENCODED_BYTE_FULL_SIZE ((NORALSY_ENCODED_BIT_SIZE) / 8)
+#define NORALSY_DECODED_DATA_SIZE      ((NORALSY_ENCODED_BIT_SIZE) / 8)
+
+#define NORALSY_READ_SHORT_TIME  (128)
+#define NORALSY_READ_LONG_TIME   (256)
+#define NORALSY_READ_JITTER_TIME (60)
+
+#define NORALSY_READ_SHORT_TIME_LOW  (NORALSY_READ_SHORT_TIME - NORALSY_READ_JITTER_TIME)
+#define NORALSY_READ_SHORT_TIME_HIGH (NORALSY_READ_SHORT_TIME + NORALSY_READ_JITTER_TIME)
+#define NORALSY_READ_LONG_TIME_LOW   (NORALSY_READ_LONG_TIME - NORALSY_READ_JITTER_TIME)
+#define NORALSY_READ_LONG_TIME_HIGH  (NORALSY_READ_LONG_TIME + NORALSY_READ_JITTER_TIME)
+
+#define TAG "NORALSY"
+
+typedef struct {
+    uint8_t data[NORALSY_ENCODED_BYTE_SIZE];
+    uint8_t encoded_data[NORALSY_ENCODED_BYTE_SIZE];
+
+    uint8_t encoded_data_index;
+    bool encoded_polarity;
+
+    ManchesterState decoder_manchester_state;
+} ProtocolNoralsy;
+
+ProtocolNoralsy* protocol_noralsy_alloc(void) {
+    ProtocolNoralsy* protocol = malloc(sizeof(ProtocolNoralsy));
+    return (void*)protocol;
+}
+
+void protocol_noralsy_free(ProtocolNoralsy* protocol) {
+    free(protocol);
+}
+
+static uint8_t noralsy_chksum(uint8_t* bits, uint8_t len) {
+    uint8_t sum = 0;
+    for(uint8_t i = 0; i < len; i += 4)
+        sum ^= bit_lib_get_bits(bits, i, 4);
+    return sum & 0x0F;
+}
+
+uint8_t* protocol_noralsy_get_data(ProtocolNoralsy* protocol) {
+    return protocol->data;
+}
+
+static void protocol_noralsy_decode(ProtocolNoralsy* protocol) {
+    bit_lib_copy_bits(protocol->data, 0, NORALSY_ENCODED_BIT_SIZE, protocol->encoded_data, 0);
+}
+
+static bool protocol_noralsy_can_be_decoded(ProtocolNoralsy* protocol) {
+    // check 12 bits preamble
+    // If necessary, use 0xBB0214FF for 32 bit preamble check
+    // However, it is not confirmed the 13-16 bit are static.
+    if(bit_lib_get_bits_16(protocol->encoded_data, 0, 12) != 0b101110110000) return false;
+    uint8_t calc1 = noralsy_chksum(&protocol->encoded_data[4], 40);
+    uint8_t calc2 = noralsy_chksum(&protocol->encoded_data[0], 76);
+    uint8_t chk1 = bit_lib_get_bits(protocol->encoded_data, 72, 4);
+    uint8_t chk2 = bit_lib_get_bits(protocol->encoded_data, 76, 4);
+    if(calc1 != chk1 || calc2 != chk2) return false;
+
+    return true;
+}
+
+void protocol_noralsy_decoder_start(ProtocolNoralsy* protocol) {
+    memset(protocol->encoded_data, 0, NORALSY_ENCODED_BYTE_FULL_SIZE);
+    manchester_advance(
+        protocol->decoder_manchester_state,
+        ManchesterEventReset,
+        &protocol->decoder_manchester_state,
+        NULL);
+}
+
+bool protocol_noralsy_decoder_feed(ProtocolNoralsy* protocol, bool level, uint32_t duration) {
+    bool result = false;
+
+    ManchesterEvent event = ManchesterEventReset;
+
+    if(duration > NORALSY_READ_SHORT_TIME_LOW && duration < NORALSY_READ_SHORT_TIME_HIGH) {
+        if(!level) {
+            event = ManchesterEventShortHigh;
+        } else {
+            event = ManchesterEventShortLow;
+        }
+    } else if(duration > NORALSY_READ_LONG_TIME_LOW && duration < NORALSY_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, NORALSY_ENCODED_BYTE_FULL_SIZE, data);
+
+            if(protocol_noralsy_can_be_decoded(protocol)) {
+                protocol_noralsy_decode(protocol);
+                result = true;
+            }
+        }
+    }
+
+    return result;
+}
+
+bool protocol_noralsy_encoder_start(ProtocolNoralsy* protocol) {
+    bit_lib_copy_bits(protocol->encoded_data, 0, NORALSY_ENCODED_BIT_SIZE, protocol->data, 0);
+
+    return true;
+}
+
+LevelDuration protocol_noralsy_encoder_yield(ProtocolNoralsy* protocol) {
+    bool level = bit_lib_get_bit(protocol->encoded_data, protocol->encoded_data_index);
+    uint32_t duration = NORALSY_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, NORALSY_ENCODED_BIT_SIZE);
+    }
+
+    return level_duration_make(level, duration);
+}
+
+bool protocol_noralsy_write_data(ProtocolNoralsy* protocol, void* data) {
+    LFRFIDWriteRequest* request = (LFRFIDWriteRequest*)data;
+    bool result = false;
+
+    // Correct protocol data by redecoding
+    protocol_noralsy_encoder_start(protocol);
+    protocol_noralsy_decode(protocol);
+
+    protocol_noralsy_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) | LFRFID_T5577_ST_TERMINATOR);
+        // In fact, base on the current two dump samples from Iceman server,
+        // Noralsy are usually T5577s with config = 0x00088C6A
+        // But the `C` and `A` are not explainable by the ATA5577C datasheet
+        // and they don't affect reading whatsoever.
+        // So we are mimicing Proxmark's solution here. Leave those nibbles as zero.
+        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;
+}
+
+static void protocol_noralsy_render_data_internal(
+    ProtocolNoralsy* protocol,
+    FuriString* result,
+    bool brief) {
+    UNUSED(protocol);
+    uint32_t raw2 = bit_lib_get_bits_32(protocol->data, 32, 32);
+    uint32_t raw3 = bit_lib_get_bits_32(protocol->data, 64, 32);
+    uint32_t cardid = ((raw2 & 0xFFF00000) >> 20) << 16;
+    cardid |= (raw2 & 0xFF) << 8;
+    cardid |= ((raw3 & 0xFF000000) >> 24);
+
+    uint8_t year = (raw2 & 0x000ff000) >> 12;
+    bool tag_is_gen_z = (year > 0x60);
+    if(brief) {
+        furi_string_printf(
+            result,
+            "Card ID: %07lx\n"
+            "Year: %s%02x",
+            cardid,
+            tag_is_gen_z ? "19" : "20",
+            year);
+    } else {
+        furi_string_printf(
+            result,
+            "Card ID: %07lx\n"
+            "Year: %s%02x",
+            cardid,
+            tag_is_gen_z ? "19" : "20",
+            year);
+    }
+}
+
+void protocol_noralsy_render_data(ProtocolNoralsy* protocol, FuriString* result) {
+    protocol_noralsy_render_data_internal(protocol, result, false);
+}
+
+void protocol_noralsy_render_brief_data(ProtocolNoralsy* protocol, FuriString* result) {
+    protocol_noralsy_render_data_internal(protocol, result, true);
+}
+
+const ProtocolBase protocol_noralsy = {
+    .name = "Noralsy",
+    .manufacturer = "Noralsy",
+    .data_size = NORALSY_DECODED_DATA_SIZE,
+    .features = LFRFIDFeatureASK,
+    .validate_count = 3,
+    .alloc = (ProtocolAlloc)protocol_noralsy_alloc,
+    .free = (ProtocolFree)protocol_noralsy_free,
+    .get_data = (ProtocolGetData)protocol_noralsy_get_data,
+    .decoder =
+        {
+            .start = (ProtocolDecoderStart)protocol_noralsy_decoder_start,
+            .feed = (ProtocolDecoderFeed)protocol_noralsy_decoder_feed,
+        },
+    .encoder =
+        {
+            .start = (ProtocolEncoderStart)protocol_noralsy_encoder_start,
+            .yield = (ProtocolEncoderYield)protocol_noralsy_encoder_yield,
+        },
+    .render_data = (ProtocolRenderData)protocol_noralsy_render_data,
+    .render_brief_data = (ProtocolRenderData)protocol_noralsy_render_brief_data,
+    .write_data = (ProtocolWriteData)protocol_noralsy_write_data,
+};

lib/lfrfid/protocols/protocol_noralsy.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <toolbox/protocols/protocol.h>
+
+extern const ProtocolBase protocol_noralsy;