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leviathan
2026-02-07 17:35:27 -05:00
parent c8bff9afd7
commit 4339895b41
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src/protocols/kia_v6.rs
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//! Kia V6 protocol decoder
//!
//! Ported from protopirate's kia_v6.c
//!
//! Protocol characteristics:
//! - Manchester encoding: 200/400µs timing
//! - 144 bits total (split into 3 parts)
//! - Long preamble of 600+ pairs
//! - AES-128 encryption
//! - Decode-only (no encoder)
use super::{ProtocolDecoder, ProtocolTiming, DecodedSignal};
use crate::radio::demodulator::LevelDuration;
use crate::duration_diff;
const TE_SHORT: u32 = 200;
const TE_LONG: u32 = 400;
const TE_DELTA: u32 = 100;
const MIN_COUNT_BIT: usize = 144;
const PREAMBLE_COUNT: u16 = 601;
const XOR_MASK_LOW: u32 = 0x84AF25FB;
const XOR_MASK_HIGH: u32 = 0x638766AB;
/// AES S-box
const AES_SBOX: [u8; 256] = [
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
];
/// AES inverse S-box
const AES_SBOX_INV: [u8; 256] = [
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d,
];
const AES_RCON: [u8; 10] = [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];
/// Manchester states
#[derive(Debug, Clone, Copy, PartialEq)]
enum ManchesterState {
Mid0,
Mid1,
Start0,
Start1,
}
/// Decoder states
#[derive(Debug, Clone, Copy, PartialEq)]
enum DecoderStep {
Reset,
WaitFirstHigh,
WaitLongHigh,
Data,
}
/// Kia V6 protocol decoder
pub struct KiaV6Decoder {
step: DecoderStep,
te_last: u32,
header_count: u16,
manchester_state: ManchesterState,
data_part1_low: u32,
data_part1_high: u32,
stored_part1_low: u32,
stored_part1_high: u32,
stored_part2_low: u32,
stored_part2_high: u32,
data_part3: u16,
bit_count: u8,
}
impl KiaV6Decoder {
pub fn new() -> Self {
Self {
step: DecoderStep::Reset,
te_last: 0,
header_count: 0,
manchester_state: ManchesterState::Mid1,
data_part1_low: 0,
data_part1_high: 0,
stored_part1_low: 0,
stored_part1_high: 0,
stored_part2_low: 0,
stored_part2_high: 0,
data_part3: 0,
bit_count: 0,
}
}
/// Get keystore A (placeholder)
fn get_keystore_a() -> u64 {
0x0000000000000000
}
/// Get keystore B (placeholder)
fn get_keystore_b() -> u64 {
0x0000000000000000
}
/// CRC8 calculation
fn crc8(data: &[u8], init: u8, polynomial: u8) -> u8 {
let mut crc = init;
for &byte in data {
crc ^= byte;
for _ in 0..8 {
let b = crc << 1;
if (crc & 0x80) != 0 {
crc = b ^ polynomial;
} else {
crc = b;
}
}
}
crc
}
/// GF(2^8) multiply by 2
fn gf_mul2(x: u8) -> u8 {
((x >> 7).wrapping_mul(0x1b)) ^ (x << 1)
}
/// AES inverse SubBytes
fn aes_subbytes_inv(state: &mut [u8; 16]) {
for i in 0..16 {
state[i] = AES_SBOX_INV[state[i] as usize];
}
}
/// AES inverse ShiftRows
fn aes_shiftrows_inv(state: &mut [u8; 16]) {
let temp = state[13];
state[13] = state[9];
state[9] = state[5];
state[5] = state[1];
state[1] = temp;
let temp = state[2];
state[2] = state[10];
state[10] = temp;
let temp = state[6];
state[6] = state[14];
state[14] = temp;
let temp = state[3];
state[3] = state[7];
state[7] = state[11];
state[11] = state[15];
state[15] = temp;
}
/// AES inverse MixColumns
fn aes_mixcolumns_inv(state: &mut [u8; 16]) {
for i in 0..4 {
let a = state[i * 4];
let b = state[i * 4 + 1];
let c = state[i * 4 + 2];
let d = state[i * 4 + 3];
let a2 = Self::gf_mul2(a);
let a4 = Self::gf_mul2(a2);
let a8 = Self::gf_mul2(a4);
let b2 = Self::gf_mul2(b);
let b4 = Self::gf_mul2(b2);
let b8 = Self::gf_mul2(b4);
let c2 = Self::gf_mul2(c);
let c4 = Self::gf_mul2(c2);
let c8 = Self::gf_mul2(c4);
let d2 = Self::gf_mul2(d);
let d4 = Self::gf_mul2(d2);
let d8 = Self::gf_mul2(d4);
state[i * 4] = (a8 ^ a4 ^ a2) ^ (b8 ^ b2 ^ b) ^ (c8 ^ c4 ^ c) ^ (d8 ^ d);
state[i * 4 + 1] = (a8 ^ a) ^ (b8 ^ b4 ^ b2) ^ (c8 ^ c2 ^ c) ^ (d8 ^ d4 ^ d);
state[i * 4 + 2] = (a8 ^ a4 ^ a) ^ (b8 ^ b) ^ (c8 ^ c4 ^ c2) ^ (d8 ^ d2 ^ d);
state[i * 4 + 3] = (a8 ^ a2 ^ a) ^ (b8 ^ b4 ^ b) ^ (c8 ^ c) ^ (d8 ^ d4 ^ d2);
}
}
/// AES AddRoundKey
fn aes_addroundkey(state: &mut [u8; 16], round_key: &[u8]) {
for i in 0..16 {
state[i] ^= round_key[i];
}
}
/// AES key expansion
fn aes_key_expansion(key: &[u8; 16]) -> [u8; 176] {
let mut round_keys = [0u8; 176];
round_keys[..16].copy_from_slice(key);
for i in 4..44 {
let prev_word_idx = (i - 1) * 4;
let mut b0 = round_keys[prev_word_idx];
let mut b1 = round_keys[prev_word_idx + 1];
let mut b2 = round_keys[prev_word_idx + 2];
let mut b3 = round_keys[prev_word_idx + 3];
if (i % 4) == 0 {
let new_b0 = AES_SBOX[b1 as usize] ^ AES_RCON[(i / 4) - 1];
let new_b1 = AES_SBOX[b2 as usize];
let new_b2 = AES_SBOX[b3 as usize];
let new_b3 = AES_SBOX[b0 as usize];
b0 = new_b0;
b1 = new_b1;
b2 = new_b2;
b3 = new_b3;
}
let back_word_idx = (i - 4) * 4;
b0 ^= round_keys[back_word_idx];
b1 ^= round_keys[back_word_idx + 1];
b2 ^= round_keys[back_word_idx + 2];
b3 ^= round_keys[back_word_idx + 3];
let curr_word_idx = i * 4;
round_keys[curr_word_idx] = b0;
round_keys[curr_word_idx + 1] = b1;
round_keys[curr_word_idx + 2] = b2;
round_keys[curr_word_idx + 3] = b3;
}
round_keys
}
/// AES-128 decrypt
fn aes128_decrypt(expanded_key: &[u8; 176], data: &mut [u8; 16]) {
let mut state = *data;
Self::aes_addroundkey(&mut state, &expanded_key[160..176]);
for round in (1..10).rev() {
Self::aes_shiftrows_inv(&mut state);
Self::aes_subbytes_inv(&mut state);
Self::aes_addroundkey(&mut state, &expanded_key[round * 16..(round + 1) * 16]);
Self::aes_mixcolumns_inv(&mut state);
}
Self::aes_shiftrows_inv(&mut state);
Self::aes_subbytes_inv(&mut state);
Self::aes_addroundkey(&mut state, &expanded_key[0..16]);
*data = state;
}
/// Get AES key from keystores
fn get_aes_key() -> [u8; 16] {
let keystore_a = Self::get_keystore_a();
let keystore_a_hi = ((keystore_a >> 32) & 0xFFFFFFFF) as u32;
let keystore_a_lo = (keystore_a & 0xFFFFFFFF) as u32;
let u_var15_a = keystore_a_lo ^ XOR_MASK_LOW;
let u_var5_a = XOR_MASK_HIGH ^ keystore_a_hi;
let val64_a = ((u_var5_a as u64) << 32) | (u_var15_a as u64);
let keystore_b = Self::get_keystore_b();
let keystore_b_hi = ((keystore_b >> 32) & 0xFFFFFFFF) as u32;
let keystore_b_lo = (keystore_b & 0xFFFFFFFF) as u32;
let u_var15_b = keystore_b_lo ^ XOR_MASK_LOW;
let u_var5_b = XOR_MASK_HIGH ^ keystore_b_hi;
let val64_b = ((u_var5_b as u64) << 32) | (u_var15_b as u64);
let mut aes_key = [0u8; 16];
for i in 0..8 {
aes_key[i] = ((val64_a >> (56 - i * 8)) & 0xFF) as u8;
}
for i in 0..8 {
aes_key[i + 8] = ((val64_b >> (56 - i * 8)) & 0xFF) as u8;
}
aes_key
}
/// Decrypt the stored data
fn decrypt(&self) -> Option<(u32, u8, u32, bool)> {
let mut encrypted_data = [0u8; 16];
encrypted_data[0] = ((self.stored_part1_high >> 8) & 0xFF) as u8;
encrypted_data[1] = (self.stored_part1_high & 0xFF) as u8;
encrypted_data[2] = ((self.stored_part1_low >> 24) & 0xFF) as u8;
encrypted_data[3] = ((self.stored_part1_low >> 16) & 0xFF) as u8;
encrypted_data[4] = ((self.stored_part1_low >> 8) & 0xFF) as u8;
encrypted_data[5] = (self.stored_part1_low & 0xFF) as u8;
encrypted_data[6] = ((self.stored_part2_high >> 24) & 0xFF) as u8;
encrypted_data[7] = ((self.stored_part2_high >> 16) & 0xFF) as u8;
encrypted_data[8] = ((self.stored_part2_high >> 8) & 0xFF) as u8;
encrypted_data[9] = (self.stored_part2_high & 0xFF) as u8;
encrypted_data[10] = ((self.stored_part2_low >> 24) & 0xFF) as u8;
encrypted_data[11] = ((self.stored_part2_low >> 16) & 0xFF) as u8;
encrypted_data[12] = ((self.stored_part2_low >> 8) & 0xFF) as u8;
encrypted_data[13] = (self.stored_part2_low & 0xFF) as u8;
encrypted_data[14] = ((self.data_part3 >> 8) & 0xFF) as u8;
encrypted_data[15] = (self.data_part3 & 0xFF) as u8;
let aes_key = Self::get_aes_key();
let expanded_key = Self::aes_key_expansion(&aes_key);
Self::aes128_decrypt(&expanded_key, &mut encrypted_data);
let decrypted = &encrypted_data;
let calculated_crc = Self::crc8(&decrypted[..15], 0xFF, 0x07);
let stored_crc = decrypted[15];
let crc_valid = (calculated_crc ^ stored_crc) < 2;
// Serial: bytes 4-6 as 24-bit big-endian
let serial = ((decrypted[4] as u32) << 16) | ((decrypted[5] as u32) << 8) | (decrypted[6] as u32);
let button = decrypted[7];
let counter = ((decrypted[8] as u32) << 24) |
((decrypted[9] as u32) << 16) |
((decrypted[10] as u32) << 8) |
(decrypted[11] as u32);
Some((serial, button, counter, crc_valid))
}
/// Manchester state machine
fn manchester_advance(&mut self, is_short: bool, is_high: bool) -> Option<bool> {
let event = match (is_short, is_high) {
(true, true) => 0, // Short High
(true, false) => 2, // Short Low
(false, true) => 6, // Long High
(false, false) => 4, // Long Low
};
let (new_state, output) = match (self.manchester_state, event) {
(ManchesterState::Mid0, 2) | (ManchesterState::Mid1, 2) =>
(ManchesterState::Start0, None),
(ManchesterState::Mid0, 0) | (ManchesterState::Mid1, 0) =>
(ManchesterState::Start1, None),
(ManchesterState::Start1, 2) => (ManchesterState::Mid1, Some(true)),
(ManchesterState::Start1, 4) => (ManchesterState::Start0, Some(true)),
(ManchesterState::Start0, 0) => (ManchesterState::Mid0, Some(false)),
(ManchesterState::Start0, 6) => (ManchesterState::Start1, Some(false)),
_ => (ManchesterState::Mid1, None),
};
self.manchester_state = new_state;
output
}
/// Add initial sync bits
fn add_sync_bits(&mut self) {
// Add 1, 1, 0, 1 as initial bits
for bit in [true, true, false, true] {
let carry = self.data_part1_low >> 31;
self.data_part1_low = (self.data_part1_low << 1) | (bit as u32);
self.data_part1_high = (self.data_part1_high << 1) | carry;
self.bit_count += 1;
}
}
}
impl ProtocolDecoder for KiaV6Decoder {
fn name(&self) -> &'static str {
"Kia V6"
}
fn timing(&self) -> ProtocolTiming {
ProtocolTiming {
te_short: TE_SHORT,
te_long: TE_LONG,
te_delta: TE_DELTA,
min_count_bit: MIN_COUNT_BIT,
}
}
fn supported_frequencies(&self) -> &[u32] {
&[433_920_000]
}
fn reset(&mut self) {
self.step = DecoderStep::Reset;
self.te_last = 0;
self.header_count = 0;
self.manchester_state = ManchesterState::Mid1;
self.data_part1_low = 0;
self.data_part1_high = 0;
self.stored_part1_low = 0;
self.stored_part1_high = 0;
self.stored_part2_low = 0;
self.stored_part2_high = 0;
self.data_part3 = 0;
self.bit_count = 0;
}
fn feed(&mut self, level: bool, duration: u32) -> Option<DecodedSignal> {
let is_short = duration_diff!(duration, TE_SHORT) < TE_DELTA;
let is_long = duration_diff!(duration, TE_LONG) < TE_DELTA;
match self.step {
DecoderStep::Reset => {
if level && is_short {
self.step = DecoderStep::WaitFirstHigh;
self.te_last = duration;
self.header_count = 0;
self.manchester_state = ManchesterState::Mid1;
}
}
DecoderStep::WaitFirstHigh => {
if level {
return None;
}
let diff_short = duration_diff!(duration, TE_SHORT);
let diff_long = duration_diff!(duration, TE_LONG);
if diff_long < TE_DELTA && diff_long < diff_short {
if self.header_count >= PREAMBLE_COUNT {
self.header_count = 0;
self.te_last = duration;
self.step = DecoderStep::WaitLongHigh;
return None;
}
}
if diff_short >= TE_DELTA && diff_long >= TE_DELTA {
self.step = DecoderStep::Reset;
return None;
}
if duration_diff!(self.te_last, TE_SHORT) < TE_DELTA {
self.te_last = duration;
self.header_count += 1;
} else {
self.step = DecoderStep::Reset;
}
}
DecoderStep::WaitLongHigh => {
if !level {
self.step = DecoderStep::Reset;
return None;
}
let diff_long = duration_diff!(duration, TE_LONG);
let diff_short = duration_diff!(duration, TE_SHORT);
if diff_long >= TE_DELTA && diff_short >= TE_DELTA {
self.step = DecoderStep::Reset;
return None;
}
if duration_diff!(self.te_last, TE_LONG) >= TE_DELTA {
self.step = DecoderStep::Reset;
return None;
}
self.data_part1_low = 0;
self.data_part1_high = 0;
self.bit_count = 0;
self.add_sync_bits();
self.step = DecoderStep::Data;
}
DecoderStep::Data => {
if !is_short && !is_long {
self.step = DecoderStep::Reset;
return None;
}
if let Some(bit) = self.manchester_advance(is_short, level) {
let carry = self.data_part1_low >> 31;
self.data_part1_low = (self.data_part1_low << 1) | (bit as u32);
self.data_part1_high = (self.data_part1_high << 1) | carry;
self.bit_count += 1;
if self.bit_count == 64 {
self.stored_part1_low = !self.data_part1_low;
self.stored_part1_high = !self.data_part1_high;
self.data_part1_low = 0;
self.data_part1_high = 0;
} else if self.bit_count == 128 {
self.stored_part2_low = !self.data_part1_low;
self.stored_part2_high = !self.data_part1_high;
self.data_part1_low = 0;
self.data_part1_high = 0;
}
}
self.te_last = duration;
if self.bit_count as usize == MIN_COUNT_BIT {
self.data_part3 = !(self.data_part1_low as u16);
if let Some((serial, button, counter, crc_valid)) = self.decrypt() {
let key_data = ((self.stored_part1_high as u64) << 32) |
(self.stored_part1_low as u64);
self.step = DecoderStep::Reset;
return Some(DecodedSignal {
serial: Some(serial),
button: Some(button),
counter: Some((counter & 0xFFFF) as u16), // V6 has 32-bit counter but we only store 16
crc_valid,
data: key_data,
data_count_bit: MIN_COUNT_BIT,
encoder_capable: false,
});
}
self.step = DecoderStep::Reset;
}
}
}
None
}
fn supports_encoding(&self) -> bool {
false // V6 is decode-only
}
fn encode(&self, _decoded: &DecodedSignal, _button: u8) -> Option<Vec<LevelDuration>> {
None
}
}