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KaraZajac 48ee413c9b v1.2.0: Add 4 new protocols, fix 5 existing, port Kia V6 encoder

New protocols (from ProtoPirate):
- Mazda V0: 433MHz, pair-based decoding, XOR deobfuscation
- Mitsubishi V0: 868MHz, PWM, bit negation + XOR unscrambling
- Porsche Touareg: 433/868MHz, sync preamble, 24-bit rotate cipher
- Fiat V1 (Magneti Marelli BSI): 433MHz, auto-detected timing variants

Protocol fixes aligned with ProtoPirate reference:
- Kia V1: Fix Manchester level mapping (inverted convention), off-by-one
  bit count, CRC4 simplified to 7 bytes + offset 1
- Kia V2: Fix CRC byte layout (was double-counting nibbles), off-by-one
  bit count, preamble short-HIGH handling
- Fiat V0: Fix endbyte transform (remove (<<1)|1), standard Manchester
  encoder (was differential), 7 btn bits (was 6), gap path fallback
- PSA: Fix modified TEA (XTEA-like dynamic key selection), XOR decrypt
  byte mapping, critical key2_low construction bug, encoder polarity and
  preamble, add key1_high nibble validation, dual preamble patterns
- Ford V0: Add calculate_checksum (sums all serial+count bytes) for encoder

Kia V6 encoder ported:
- Forward AES-128 (SubBytes, ShiftRows, MixColumns, encrypt)
- encrypt_payload: build plaintext, AES encrypt, pack into 3 parts
- Two-pass Manchester upload (640 + 38 preamble pairs)
- fx_field extraction stored in DecodedSignal.extra for encode roundtrip

Updated README, protocol docs, and version bump to 1.2.0.

2026-03-22 12:05:01 -04:00

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layout

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Fiat V1 Protocol (Magneti Marelli BSI / PCF7946)

Rust module: src/protocols/fiat_v1.rs Reference: REFERENCES/ProtoPirate/protocols/fiat_v1.c

Overview

Fiat V1 is the Magneti Marelli BSI keyfob protocol (PCF7946), found on Fiat Panda, Grande Punto, and possibly other Fiat/Lancia/Alfa ~2003-2012. Uses Manchester encoding with auto-detected timing from preamble pulse averaging. Two timing variants: Type A (~260 us, e.g. Panda) and Type B (~100 us, e.g. Grande Punto). This is a different protocol from Fiat V0.

Timing

Parameter	Default	Notes
Short	260 us	Auto-detected from preamble
Long	520 us	2x detected TE
Delta	80 us	Minimum 30 us
Preamble	80+ pulses	50-350 us range
Min bits	80	Max 104 bits

Auto-Detection

Preamble pulses (50-350 us) are accumulated. After 80+ pulses, te_detected = te_sum / te_count becomes the reference TE. Type A/B boundary is at 180 us.

Frame Layout (80-104 bits = 10-13 bytes)

Bytes	Content
0-1	Preamble residue (0xFFFF/0xFFFC)
2-5	Serial (32 bits)
6	Button:4 \| Epoch:4
7	Counter:5 \| Scramble:2 \| Fixed:1
8-12	Encrypted payload (40 bits)

Decoder Steps

Reset -- Wait for HIGH pulse in 50-350 us range. Also detect retransmission gaps (>5000 us).
Preamble -- Count pulses, accumulate for TE averaging. On gap >= te_detected * 4, transition to Sync.
Sync -- Expect HIGH sync pulse of te_detected * 4 to te_detected * 12 duration.
Data -- Manchester decode up to 104 bits into 13-byte raw buffer.
RetxSync -- After gap >5000 us, look for sync pulse 400-2800 us (retransmission).

Buttons

Code	Name
0x7	Lock
0xB	Unlock
0xD	Trunk

Encoder

Not supported (decode-only).

Frequencies

433.92 MHz.

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