Support hex-encoded SSID

2023-02-11 23:09:49 -05:00
parent 51672dea16
commit 71a7ac508c
14 changed files with 189 additions and 33 deletions
--- a/README.md
+++ b/README.md
@@ -261,8 +261,9 @@ Greylisted/blacklisted APIs or internal constants: (some constants are hardcoded
 * (since API 30) `Landroid/net/wifi/SoftApConfiguration$Builder;->setMaxNumberOfClients(I)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
 * (since API 30) `Landroid/net/wifi/SoftApConfiguration$Builder;->setPassphrase(Ljava/lang/String;I)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
 * (since API 30) `Landroid/net/wifi/SoftApConfiguration$Builder;->setShutdownTimeoutMillis(J)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
-* (since API 30) `Landroid/net/wifi/SoftApConfiguration$Builder;->setSsid(Ljava/lang/String;)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
+* (since API 30, prior to API 33) `Landroid/net/wifi/SoftApConfiguration$Builder;->setSsid(Ljava/lang/String;)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
 * (since API 33) `Landroid/net/wifi/SoftApConfiguration$Builder;->setVendorElements(Ljava/util/List;)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
+* (since API 33) `Landroid/net/wifi/SoftApConfiguration$Builder;->setWifiSsid(Landroid/net/wifi/WifiSsid;)Landroid/net/wifi/SoftApConfiguration$Builder;,sdk,system-api,test-api`
 * (since API 30) `Landroid/net/wifi/SoftApConfiguration;->BAND_2GHZ:I,sdk,system-api,test-api`
 * (since API 30) `Landroid/net/wifi/SoftApConfiguration;->BAND_5GHZ:I,sdk,system-api,test-api`
 * (since API 31) `Landroid/net/wifi/SoftApConfiguration;->BAND_60GHZ:I,sdk,system-api,test-api`
--- a/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt
@@ -34,6 +34,7 @@ import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper.requestPersistentGroupI
 import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper.setVendorElements
 import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper.setWifiP2pChannels
 import be.mygod.vpnhotspot.net.wifi.WifiP2pManagerHelper.startWps
+import be.mygod.vpnhotspot.net.wifi.WifiSsidCompat
 import be.mygod.vpnhotspot.root.RepeaterCommands
 import be.mygod.vpnhotspot.root.RootManager
 import be.mygod.vpnhotspot.util.*
@@ -53,6 +54,7 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
        const val KEY_SAFE_MODE = "service.repeater.safeMode"

        private const val KEY_NETWORK_NAME = "service.repeater.networkName"
+        private const val KEY_NETWORK_NAME_HEX = "service.repeater.networkNameHex"
        private const val KEY_PASSPHRASE = "service.repeater.passphrase"
        private const val KEY_OPERATING_BAND = "service.repeater.band.v4"
        private const val KEY_OPERATING_CHANNEL = "service.repeater.oc.v3"
@@ -76,9 +78,16 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
        @get:RequiresApi(29)
        private val mNetworkName by lazy @TargetApi(29) { UnblockCentral.WifiP2pConfig_Builder_mNetworkName }

-        var networkName: String?
-            get() = app.pref.getString(KEY_NETWORK_NAME, null)
-            set(value) = app.pref.edit { putString(KEY_NETWORK_NAME, value) }
+        var networkName: WifiSsidCompat?
+            get() = app.pref.getString(KEY_NETWORK_NAME, null).let { legacy ->
+                if (legacy != null) WifiSsidCompat.fromUtf8Text(legacy).also {
+                    app.pref.edit {
+                        putString(KEY_NETWORK_NAME_HEX, it!!.hex)
+                        remove(KEY_NETWORK_NAME)
+                    }
+                } else WifiSsidCompat.fromHex(app.pref.getString(KEY_NETWORK_NAME_HEX, null))
+            }
+            set(value) = app.pref.edit { putString(KEY_NETWORK_NAME_HEX, value?.hex) }
        var passphrase: String?
            get() = app.pref.getString(KEY_PASSPHRASE, null)
            set(value) = app.pref.edit { putString(KEY_PASSPHRASE, value) }
@@ -447,10 +456,10 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
            setOperatingChannel()
        }
        if (Build.VERSION.SDK_INT >= 33) setVendorElements()
-        val networkName = networkName
+        val networkName = networkName?.toString()
        val passphrase = passphrase
        @SuppressLint("MissingPermission")  // missing permission will simply leading to returning ERROR
-        if (!safeMode || networkName.isNullOrEmpty() || passphrase.isNullOrEmpty()) {
+        if (!safeMode || networkName == null || passphrase.isNullOrEmpty()) {
            persistNextGroup = true
            p2pManager.createGroup(channel, listener)
        } else @TargetApi(29) {
@@ -510,7 +519,7 @@ class RepeaterService : Service(), CoroutineScope, WifiP2pManager.ChannelListene
        }
        binder.group = group
        if (persistNextGroup) {
-            networkName = group.networkName
+            networkName = WifiSsidCompat.fromUtf8Text(group.networkName)
            passphrase = group.passphrase
            persistNextGroup = false
        }
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotTileService.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotTileService.kt
@@ -36,7 +36,7 @@ class LocalOnlyHotspotTileService : IpNeighbourMonitoringTileService() {
                label = getText(R.string.tethering_temp_hotspot)
            } else {
                state = Tile.STATE_ACTIVE
-                label = binder.configuration?.ssid ?: getText(R.string.tethering_temp_hotspot)
+                label = binder.configuration?.ssid?.toString() ?: getText(R.string.tethering_temp_hotspot)
                subtitleDevices { it == iface }
            }
            updateTile()
--- a/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/manage/RepeaterManager.kt
@@ -33,6 +33,7 @@ import be.mygod.vpnhotspot.net.wifi.P2pSupplicantConfiguration
 import be.mygod.vpnhotspot.net.wifi.SoftApConfigurationCompat
 import be.mygod.vpnhotspot.net.wifi.WifiApDialogFragment
 import be.mygod.vpnhotspot.net.wifi.WifiApManager
+import be.mygod.vpnhotspot.net.wifi.WifiSsidCompat
 import be.mygod.vpnhotspot.util.ServiceForegroundConnector
 import be.mygod.vpnhotspot.util.formatAddresses
 import be.mygod.vpnhotspot.util.showAllowingStateLoss
@@ -215,7 +216,7 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
        } else binder?.let { binder ->
            val group = binder.group ?: binder.fetchPersistentGroup().let { binder.group }
            if (group != null) return SoftApConfigurationCompat(
-                ssid = group.networkName,
+                ssid = WifiSsidCompat.fromUtf8Text(group.networkName),
                securityType = SoftApConfiguration.SECURITY_TYPE_WPA2_PSK,  // is not actually used
                isAutoShutdownEnabled = RepeaterService.isAutoShutdownEnabled,
                shutdownTimeoutMillis = RepeaterService.shutdownTimeoutMillis,
@@ -253,8 +254,12 @@ class RepeaterManager(private val parent: TetheringFragment) : Manager(), Servic
            RepeaterService.passphrase = config.passphrase
        } else holder.config?.let { master ->
            val binder = binder
-            if (binder?.group?.networkName != config.ssid || master.psk != config.passphrase ||
-                    master.bssid != config.bssid) try {
+            val mayBeModified = master.psk != config.passphrase || master.bssid != config.bssid || config.ssid.run {
+                if (this != null) decode().let {
+                    it == null || binder?.group?.networkName != it
+                } else binder?.group?.networkName != null
+            }
+            if (mayBeModified) try {
                withContext(Dispatchers.Default) { master.update(config.ssid!!, config.passphrase!!, config.bssid) }
                (this.binder ?: binder)?.group = null
            } catch (e: Exception) {
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
@@ -145,10 +145,9 @@ class P2pSupplicantConfiguration(private val group: WifiP2pGroup? = null) {
        content.target.bssid?.let { MacAddress.fromString(it) }
    }

-    suspend fun update(ssid: String, psk: String, bssid: MacAddress?) {
+    suspend fun update(ssid: WifiSsidCompat, psk: String, bssid: MacAddress?) {
        val (lines, block, persistentMacLine, legacy) = content
-        block[block.ssidLine!!] = "\tssid=" + ssid.toByteArray()
-                .joinToString("") { (it.toInt() and 255).toString(16).padStart(2, '0') }
+        block[block.ssidLine!!] = "\tssid=${ssid.hex}"
        block[block.pskLine!!] = "\tpsk=\"$psk\""   // no control chars or weird stuff
        if (bssid != null) {
            persistentMacLine?.let { lines[it] = PERSISTENT_MAC + bssid }
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/SoftApConfigurationCompat.kt
@@ -5,6 +5,7 @@ import android.annotation.TargetApi
 import android.net.MacAddress
 import android.net.wifi.ScanResult
 import android.net.wifi.SoftApConfiguration
+import android.net.wifi.WifiSsid
 import android.os.Build
 import android.os.Parcelable
 import android.util.SparseIntArray
@@ -12,6 +13,7 @@ import androidx.annotation.RequiresApi
 import be.mygod.vpnhotspot.net.monitor.TetherTimeoutMonitor
 import be.mygod.vpnhotspot.net.wifi.SoftApConfigurationCompat.Companion.requireSingleBand
 import be.mygod.vpnhotspot.net.wifi.SoftApConfigurationCompat.Companion.setChannel
+import be.mygod.vpnhotspot.net.wifi.WifiSsidCompat.Companion.toCompat
 import be.mygod.vpnhotspot.util.ConstantLookup
 import be.mygod.vpnhotspot.util.UnblockCentral
 import kotlinx.parcelize.Parcelize
@@ -20,7 +22,7 @@ import java.lang.reflect.InvocationTargetException

@Parcelize
 data class SoftApConfigurationCompat(
-    var ssid: String? = null,
+    var ssid: WifiSsidCompat? = null,
    var bssid: MacAddress? = null,
    var passphrase: String? = null,
    var isHiddenSsid: Boolean = false,
@@ -116,8 +118,6 @@ data class SoftApConfigurationCompat(
            "WPA3-OWE",
        )

-        private val qrSanitizer = Regex("([\\\\\":;,])")
-
        /**
         * Based on:
         * https://elixir.bootlin.com/linux/v5.12.8/source/net/wireless/util.c#L75
@@ -344,11 +344,15 @@ data class SoftApConfigurationCompat(
        private val setVendorElements by lazy @TargetApi(33) {
            classBuilder.getDeclaredMethod("setVendorElements", java.util.List::class.java)
        }
+        @get:RequiresApi(33)
+        private val setWifiSsid by lazy @TargetApi(33) {
+            classBuilder.getDeclaredMethod("setWifiSsid", WifiSsid::class.java)
+        }

        @Deprecated("Class deprecated in framework")
        @Suppress("DEPRECATION")
        fun android.net.wifi.WifiConfiguration.toCompat() = SoftApConfigurationCompat(
-                SSID,
+                WifiSsidCompat.fromUtf8Text(SSID),
                BSSID?.let { MacAddress.fromString(it) },
                preSharedKey,
                hiddenSSID,
@@ -388,7 +392,9 @@ data class SoftApConfigurationCompat(
        @RequiresApi(30)
        @Suppress("UNCHECKED_CAST")
        fun SoftApConfiguration.toCompat() = SoftApConfigurationCompat(
-            ssid,
+            if (Build.VERSION.SDK_INT >= 33) wifiSsid?.toCompat() else @Suppress("DEPRECATION") {
+                WifiSsidCompat.fromUtf8Text(ssid)
+            },
            bssid,
            passphrase,
            isHiddenSsid,
@@ -483,7 +489,7 @@ data class SoftApConfigurationCompat(
        val wc = underlying as? android.net.wifi.WifiConfiguration
        val result = if (wc == null) android.net.wifi.WifiConfiguration() else android.net.wifi.WifiConfiguration(wc)
        val original = wc?.toCompat()
-        result.SSID = ssid
+        result.SSID = ssid?.toString()
        result.preSharedKey = passphrase
        result.hiddenSSID = isHiddenSsid
        apBand.setInt(result, when (band) {
@@ -520,7 +526,9 @@ data class SoftApConfigurationCompat(
    fun toPlatform(): SoftApConfiguration {
        val sac = underlying as? SoftApConfiguration
        val builder = if (sac == null) classBuilder.newInstance() else newBuilder.newInstance(sac)
-        setSsid(builder, ssid)
+        if (Build.VERSION.SDK_INT >= 33) {
+            setWifiSsid(builder, ssid?.toPlatform())
+        } else setSsid(builder, ssid?.toString())
        setPassphrase(builder, when (securityType) {
            SoftApConfiguration.SECURITY_TYPE_OPEN,
            SoftApConfiguration.SECURITY_TYPE_WPA3_OWE_TRANSITION,
@@ -581,7 +589,6 @@ data class SoftApConfigurationCompat(
     * Based on: https://android.googlesource.com/platform/packages/apps/Settings/+/4a5ff58/src/com/android/settings/wifi/dpp/WifiNetworkConfig.java#161
     */
    fun toQrCode() = StringBuilder("WIFI:").apply {
-        fun String.sanitize() = qrSanitizer.replace(this) { "\\${it.groupValues[1]}" }
        when (securityType) {
            SoftApConfiguration.SECURITY_TYPE_OPEN, SoftApConfiguration.SECURITY_TYPE_WPA3_OWE_TRANSITION,
            SoftApConfiguration.SECURITY_TYPE_WPA3_OWE -> { }
@@ -592,11 +599,11 @@ data class SoftApConfigurationCompat(
            else -> throw IllegalArgumentException("Unsupported authentication type")
        }
        append("S:")
-        append(ssid!!.sanitize())
+        append(ssid!!.toMeCard())
        append(';')
        passphrase?.let { passphrase ->
            append("P:")
-            append(passphrase.sanitize())
+            append(WifiSsidCompat.toMeCard(passphrase))
            append(';')
        }
        if (isHiddenSsid) append("H:true;")
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApDialogFragment.kt
@@ -36,6 +36,7 @@ import be.mygod.vpnhotspot.util.QRCodeDialog
 import be.mygod.vpnhotspot.util.RangeInput
 import be.mygod.vpnhotspot.util.readableMessage
 import be.mygod.vpnhotspot.util.showAllowingStateLoss
+import com.google.android.material.textfield.TextInputLayout
 import kotlinx.parcelize.Parcelize
 import timber.log.Timber
 import java.text.DecimalFormat
@@ -129,6 +130,14 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
        )
    }
    override val ret get() = Arg(generateConfig())
+    private val hexToggleable get() = if (arg.p2pMode) !RepeaterService.safeMode else Build.VERSION.SDK_INT >= 33
+    private var hexSsid = false
+        set(value) {
+            field = value
+            dialogView.ssidWrapper.setEndIconActivated(value)
+        }
+    private val ssid get() =
+        if (hexSsid) WifiSsidCompat.fromHex(dialogView.ssid.text) else WifiSsidCompat.fromUtf8Text(dialogView.ssid.text)

    private fun generateChannels() = SparseIntArray(2).apply {
        if (!arg.p2pMode && Build.VERSION.SDK_INT >= 31) {
@@ -137,7 +146,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
        (dialogView.bandPrimary.selectedItem as ChannelOption).apply { put(band, channel) }
    }
    private fun generateConfig(full: Boolean = true) = base.copy(
-            ssid = dialogView.ssid.text.toString(),
+            ssid = ssid,
            passphrase = if (dialogView.password.length() != 0) dialogView.password.text.toString() else null).apply {
        if (!arg.p2pMode) {
            securityType = dialogView.security.selectedItemPosition
@@ -189,7 +198,31 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
        setNegativeButton(R.string.donations__button_close, null)
        dialogView.toolbar.inflateMenu(R.menu.toolbar_configuration)
        dialogView.toolbar.setOnMenuItemClickListener(this@WifiApDialogFragment)
-        dialogView.ssidWrapper.setLengthCounter { it.toString().toByteArray().size }
+        dialogView.ssidWrapper.setLengthCounter {
+            try {
+                ssid?.bytes?.size ?: 0
+            } catch (_: IllegalArgumentException) {
+                0
+            }
+        }
+        if (hexToggleable) dialogView.ssidWrapper.apply {
+            endIconMode = TextInputLayout.END_ICON_CUSTOM
+            setEndIconOnClickListener {
+                val ssid = try {
+                    ssid
+                } catch (_: IllegalArgumentException) {
+                    return@setEndIconOnClickListener
+                }
+                val newText = if (hexSsid) ssid?.run {
+                    decode().also { if (it == null) return@setEndIconOnClickListener }
+                } else ssid?.hex
+                hexSsid = !hexSsid
+                dialogView.ssid.setText(newText)
+            }
+            findViewById<View>(com.google.android.material.R.id.text_input_end_icon).apply {
+                tooltipText = contentDescription
+            }
+        }
        if (!arg.readOnly) dialogView.ssid.addTextChangedListener(this@WifiApDialogFragment)
        if (arg.p2pMode) dialogView.securityWrapper.isGone = true else dialogView.security.apply {
            adapter = ArrayAdapter(activity, android.R.layout.simple_spinner_item, 0,
@@ -293,7 +326,14 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
        } else selection
    }
    private fun populateFromConfiguration() {
-        dialogView.ssid.setText(base.ssid)
+        dialogView.ssid.setText(base.ssid.let { ssid ->
+            when {
+                ssid == null -> null
+                hexSsid -> ssid.hex
+                hexToggleable -> ssid.decode() ?: ssid.hex.also { hexSsid = true }
+                else -> ssid.toString()
+            }
+        })
        if (!arg.p2pMode) dialogView.security.setSelection(base.securityType)
        dialogView.password.setText(base.passphrase)
        dialogView.autoShutdown.isChecked = base.isAutoShutdownEnabled
@@ -334,11 +374,18 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA

    private fun validate() {
        if (!started) return
-        val ssidLength = dialogView.ssid.text.toString().toByteArray().size
-        val ssidLengthOk = ssidLength in 1..32
-        dialogView.ssidWrapper.error = if (arg.p2pMode && RepeaterService.safeMode && ssidLength < 9) {
+        val (ssidOk, ssidError) = 0.let {
+            val ssid = try {
+                ssid
+            } catch (e: IllegalArgumentException) {
+                return@let false to e.readableMessage
+            }
+            val ssidLength = ssid?.bytes?.size ?: 0
+            if (ssidLength in 1..32) true to if (arg.p2pMode && RepeaterService.safeMode && ssidLength < 9) {
                requireContext().getString(R.string.settings_service_repeater_safe_mode_warning)
-        } else if (ssidLengthOk) null else " "
+            } else null else false to " "
+        }
+        dialogView.ssidWrapper.error = ssidError
        val selectedSecurity = if (arg.p2pMode) {
            SoftApConfiguration.SECURITY_TYPE_WPA2_PSK
        } else dialogView.security.selectedItemPosition
@@ -466,7 +513,7 @@ class WifiApDialogFragment : AlertDialogFragment<WifiApDialogFragment.Arg, WifiA
                bridgedTimeoutError == null && vendorElementsError == null && persistentRandomizedMacValid &&
                acsNoError && bandwidthError == null
        (dialog as? AlertDialog)?.getButton(DialogInterface.BUTTON_POSITIVE)?.isEnabled =
-                ssidLengthOk && passwordValid && bandError == null && canCopy
+            ssidOk && passwordValid && bandError == null && canCopy
        dialogView.toolbar.menu.findItem(android.R.id.copy).isEnabled = canCopy
    }

--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiSsidCompat.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiSsidCompat.kt
@@ -0,0 +1,69 @@
+package be.mygod.vpnhotspot.net.wifi
+
+import android.net.wifi.WifiSsid
+import android.os.Parcelable
+import androidx.annotation.RequiresApi
+import kotlinx.parcelize.Parcelize
+import org.jetbrains.annotations.Contract
+import java.nio.ByteBuffer
+import java.nio.CharBuffer
+import java.nio.charset.Charset
+import java.nio.charset.CodingErrorAction
+
+@Parcelize
+data class WifiSsidCompat(val bytes: ByteArray) : Parcelable {
+    companion object {
+        private val hexTester = Regex("^(?:[0-9a-f]{2})*$", RegexOption.IGNORE_CASE)
+        private val qrSanitizer = Regex("([\\\\\":;,])")
+
+        fun fromHex(hex: CharSequence?) = hex?.run {
+            require(length % 2 == 0) { "Input should be hex: $hex" }
+            WifiSsidCompat((0 until length / 2).map {
+                Integer.parseInt(substring(it * 2, it * 2 + 2), 16).toByte()
+            }.toByteArray())
+        }
+
+        @Contract("null -> null; !null -> !null")
+        fun fromUtf8Text(text: CharSequence?) = text?.toString()?.toByteArray()?.let { WifiSsidCompat(it) }
+
+        fun toMeCard(text: String) = qrSanitizer.replace(text) { "\\${it.groupValues[1]}" }
+
+        @RequiresApi(33)
+        fun WifiSsid.toCompat() = WifiSsidCompat(bytes)
+    }
+
+    init {
+        require(bytes.size <= 32)
+    }
+
+    @RequiresApi(31)
+    fun toPlatform() = WifiSsid.fromBytes(bytes)
+
+    fun decode(charset: Charset = Charsets.UTF_8) = CharBuffer.allocate(32).run {
+        val result = charset.newDecoder().apply {
+            onMalformedInput(CodingErrorAction.REPORT)
+            onUnmappableCharacter(CodingErrorAction.REPORT)
+        }.decode(ByteBuffer.wrap(bytes), this, true)
+        if (result.isError) null else flip().toString()
+    }
+    val hex get() = bytes.joinToString("") { "%02x".format(it.toUByte().toInt()) }
+
+    fun toMeCard(): String {
+        val utf8 = decode() ?: return hex
+        return if (hexTester.matches(utf8)) "\"$utf8\"" else toMeCard(utf8)
+    }
+
+    override fun toString() = String(bytes)
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+        other as WifiSsidCompat
+        if (!bytes.contentEquals(other.bytes)) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        return bytes.contentHashCode()
+    }
+}
--- a/mobile/src/main/res/drawable/ic_av_closed_caption.xml
+++ b/mobile/src/main/res/drawable/ic_av_closed_caption.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#000000"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M19,4L5,4c-1.11,0 -2,0.9 -2,2v12c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2L21,6c0,-1.1 -0.9,-2 -2,-2zM11,11L9.5,11v-0.5h-2v3h2L9.5,13L11,13v1c0,0.55 -0.45,1 -1,1L7,15c-0.55,0 -1,-0.45 -1,-1v-4c0,-0.55 0.45,-1 1,-1h3c0.55,0 1,0.45 1,1v1zM18,11h-1.5v-0.5h-2v3h2L16.5,13L18,13v1c0,0.55 -0.45,1 -1,1h-3c-0.55,0 -1,-0.45 -1,-1v-4c0,-0.55 0.45,-1 1,-1h3c0.55,0 1,0.45 1,1v1z"/>
+</vector>
--- a/mobile/src/main/res/drawable/ic_av_closed_caption_off.xml
+++ b/mobile/src/main/res/drawable/ic_av_closed_caption_off.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#000000"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M19.5,5.5v13h-15v-13h15zM19,4L5,4c-1.11,0 -2,0.9 -2,2v12c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2L21,6c0,-1.1 -0.9,-2 -2,-2zM11,11L9.5,11v-0.5h-2v3h2L9.5,13L11,13v1c0,0.55 -0.45,1 -1,1L7,15c-0.55,0 -1,-0.45 -1,-1v-4c0,-0.55 0.45,-1 1,-1h3c0.55,0 1,0.45 1,1v1zM18,11h-1.5v-0.5h-2v3h2L16.5,13L18,13v1c0,0.55 -0.45,1 -1,1h-3c-0.55,0 -1,-0.45 -1,-1v-4c0,-0.55 0.45,-1 1,-1h3c0.55,0 1,0.45 1,1v1z"/>
+</vector>
--- a/mobile/src/main/res/drawable/toggle_hex.xml
+++ b/mobile/src/main/res/drawable/toggle_hex.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@drawable/ic_av_closed_caption" android:state_activated="true"/>
+    <item android:drawable="@drawable/ic_av_closed_caption_off"/>
+</selector>
--- a/mobile/src/main/res/layout/dialog_wifi_ap.xml
+++ b/mobile/src/main/res/layout/dialog_wifi_ap.xml
@@ -49,6 +49,8 @@
                android:hint="@string/wifi_ssid"
                app:counterEnabled="true"
                app:counterMaxLength="32"
+                app:endIconContentDescription="@string/wifi_ssid_toggle_hex"
+                app:endIconDrawable="@drawable/toggle_hex"
                app:errorEnabled="true">
                <com.google.android.material.textfield.TextInputEditText
                    android:id="@+id/ssid"
--- a/mobile/src/main/res/values-zh-rCN/strings.xml
+++ b/mobile/src/main/res/values-zh-rCN/strings.xml
@@ -175,6 +175,7 @@
    <string name="configuration_share">使用 QR 码分享</string>
    <string name="configuration_rejected">Android 系统拒绝使用此配置。（详情参见日志）</string>
    <string name="wifi_ssid" msgid="5519636102673067319">"网络名称"</string>
+    <string name="wifi_ssid_toggle_hex">切换十六进制显示</string>
    <string name="wifi_security" msgid="6603611185592956936">"安全性"</string>
    <string name="wifi_password" msgid="5948219759936151048">"密码"</string>
    <string name="wifi_hotspot_auto_off">未连接任何设备时自动关闭 WLAN 热点</string>
--- a/mobile/src/main/res/values/strings.xml
+++ b/mobile/src/main/res/values/strings.xml
@@ -199,6 +199,7 @@
    <string name="configuration_share">Share via QR code</string>
    <string name="configuration_rejected">Android system refuses such configuration. (see logcat)</string>
    <string name="wifi_ssid">Network name</string>
+    <string name="wifi_ssid_toggle_hex">Toggle hex display</string>
    <string name="wifi_security">Security</string>
    <string name="wifi_password">Password</string>
    <string name="wifi_hotspot_auto_off">Turn off hotspot automatically when no devices are connected</string>