eddy/Project_SylDa
Watch
1
1
Fork
You've already forked Project_SylDa
 0
Code Issues 2 Pull requests Projects Releases 3 Packages Wiki Activity Actions

Persist sequence counter in EncryptedSharedPreferences

Browse source
This commit is contained in:
eddy 2026-07-26 22:33:43 +02:00
commit af3810554e
2 changed files with 9 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

11
android/app/src/main/java/com/eddy/atomrelay/MainActivity.kt
View file

@ -166,14 +166,14 @@ class MainActivity : AppCompatActivity() {
bluetoothGatt = null
relayCharacteristic = null
seq = 1
loadHmacKey()
loadState()
handler.postDelayed(scanRunnable, 500)
}
}
override fun onResume() {
super.onResume()
loadHmacKey()
loadState()
if (hmacKey == null) {
statusText.text = "Geen HMAC sleutel - open Instellingen"
} else if (!isScanning && bluetoothGatt == null) {
@ -187,11 +187,12 @@ class MainActivity : AppCompatActivity() {
stopScan()
}
private fun loadHmacKey() {
private fun loadState() {
val prefs = PrefsHelper.getPrefs(this)
val hexKey = prefs.getString(PrefsHelper.PREF_KEY, null)
hmacKey = hexKey?.let { hexStringToBytes(it) }
Log.d(TAG, "HMAC key loaded: ${if (hmacKey != null) "${hmacKey!!.size} bytes" else "none"}")
seq = prefs.getInt(PrefsHelper.PREF_SEQ, 1).coerceAtMost(PrefsHelper.SEQ_MAX)
Log.d(TAG, "HMAC key loaded: ${if (hmacKey != null) "${hmacKey!!.size} bytes" else "none"}, seq=$seq")
}
private fun hexStringToBytes(hex: String): ByteArray? {
@ -314,6 +315,8 @@ class MainActivity : AppCompatActivity() {
char.writeType = BluetoothGattCharacteristic.WRITE_TYPE_NO_RESPONSE
gatt.writeCharacteristic(char)
seq++
if (seq > PrefsHelper.SEQ_MAX) seq = 1
PrefsHelper.getPrefs(this).edit().putInt(PrefsHelper.PREF_SEQ, seq).apply()
Log.d(TAG, "Sent relay ${if (on) "ON" else "OFF"} (seq=${seq - 1})")
}

2
android/app/src/main/java/com/eddy/atomrelay/PrefsHelper.kt
View file

@ -12,6 +12,8 @@ object PrefsHelper {
private const val TAG = "PrefsHelper"
const val PREFS_NAME = "relay_prefs"
const val PREF_KEY = "hmac_key"
const val PREF_SEQ = "seq_counter"
const val SEQ_MAX = 1_000_000
fun getPrefs(context: Context): SharedPreferences {
return try {