eddy
7f68e9ad70
Add BLE security: Just Works pairing + HMAC-SHA256 authentication
Two-layer security for the BLE relay:
1. BLE Just Works pairing (link-layer encryption)
- ESP32 requires bonding before accepting writes
- Characteristic permissions set to ESP_GATT_PERM_WRITE_ENCRYPTED
- IO capability NO_INPUT_NO_OUTPUT (no passkey needed)
- LE Secure Connections with bonding (ESP_LE_AUTH_REQ_SC_BOND)
2. HMAC-SHA256 authentication (application-level)
- 32-byte shared secret in src/hmac_key.h (generated, gitignored)
- Each command signed: HMAC-SHA256(key, command || sequence)
- 37-byte packet format: [cmd:1][seq:4][hmac:32]
- Sequence counter prevents replay (strictly increasing, starts at 1)
- mbedtls on ESP, javax.crypto.Mac on Android
Key management:
- tools/generate_hmac_key.py generates random key + writes src/hmac_key.h
- ESP prints hex key to serial 5 seconds after boot
- Android app: SettingsActivity with eye-toggle password field
- Key stored in SharedPreferences, supports multiple ESP modules
Other changes:
- Android app: bonding flow (createBond -> BOND_BONDED -> discover)
- Android app: MTU negotiation (request 256)
- Android app: settings button (gear icon) in main screen
- Fix: sequence counter starts at 1 to prevent first-packet rejection
- Updated README with full security documentation
|
2026-07-26 08:18:52 +02:00 |
| .. |
|
app
|
Add BLE security: Just Works pairing + HMAC-SHA256 authentication
|
2026-07-26 08:18:52 +02:00 |
|
gradle/wrapper
|
Initial commit: BLE relay controller for Atom VoiceS3R
|
2026-07-26 01:17:31 +02:00 |
|
build.gradle
|
Initial commit: BLE relay controller for Atom VoiceS3R
|
2026-07-26 01:17:31 +02:00 |
|
gradle.properties
|
Initial commit: BLE relay controller for Atom VoiceS3R
|
2026-07-26 01:17:31 +02:00 |
|
gradlew
|
Initial commit: BLE relay controller for Atom VoiceS3R
|
2026-07-26 01:17:31 +02:00 |
|
settings.gradle
|
Initial commit: BLE relay controller for Atom VoiceS3R
|
2026-07-26 01:17:31 +02:00 |