Implement full encryption protocol and haptic events on iOS

Signed-off-by: denis0001-dev <denis0001.dev@ya.ru>

app/shared/build.gradle.kts

@@ -25,6 +25,7 @@ kotlin {
         iosTarget.binaries.framework {
             baseName = "ComposeApp"
             isStatic = true
+            linkerOpts("-framework", "UIKit")
         }
     }
 
@@ -77,12 +78,15 @@ kotlin {
 
             implementation(project(":utils:shared"))
             implementation(libs.krypto)
+            implementation(libs.cryptography.core)
+            implementation(libs.cryptography.provider.optimal)
         }
 
         iosMain.dependencies {
             implementation(libs.jetbrains.kotlinx.io.bytestring)
             implementation(libs.jetbrains.kotlinx.coroutines.core)
             implementation(libs.ktor.client.darwin)
+            implementation("com.ionspin.kotlin:multiplatform-crypto-libsodium-bindings:0.9.5")
         }
     }
 }

app/shared/src/iosMain/kotlin/ru/fromchat/api/ApiClient.ios.kt

@@ -3,34 +3,29 @@ package ru.fromchat.api
 import io.ktor.client.HttpClient
 import io.ktor.client.HttpClientConfig
 import io.ktor.client.engine.darwin.Darwin
-import io.ktor.client.engine.darwin.DarwinClientEngineConfig
 import io.ktor.client.plugins.HttpTimeout
 import io.ktor.client.plugins.defaultRequest
 import io.ktor.http.ContentType
 import io.ktor.http.contentType
-import io.ktor.http.headers
 
 actual fun createPlatformHttpClient(
     block: HttpClientConfig<*>.() -> Unit
 ): HttpClient {
-    @Suppress("UNCHECKED_CAST")
     return HttpClient(Darwin) {
-        // Configure default request headers to ensure UTF-8 encoding
         defaultRequest {
             contentType(ContentType.Application.Json)
+
             headers {
                 append("Accept-Charset", "utf-8")
                 append("Content-Type", "application/json; charset=utf-8")
             }
         }
 
-        // Add timeout configuration
         install(HttpTimeout) {
             requestTimeoutMillis = 30000
             connectTimeoutMillis = 30000
         }
 
-        // Apply the passed configuration block
         block(this)
     }
 }

app/shared/src/iosMain/kotlin/ru/fromchat/crypto/backup/BackupCrypto.ios.kt

@@ -1,29 +1,81 @@
 package ru.fromchat.crypto.backup
 
+import dev.whyoleg.cryptography.BinarySize.Companion.bits
+import dev.whyoleg.cryptography.BinarySize.Companion.bytes
+import dev.whyoleg.cryptography.CryptographyProvider
+import dev.whyoleg.cryptography.algorithms.AES
+import dev.whyoleg.cryptography.algorithms.PBKDF2
+import dev.whyoleg.cryptography.algorithms.SHA256
+import dev.whyoleg.cryptography.random.CryptographyRandom
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import kotlin.random.Random
 
+private const val PBKDF2_ITERATIONS = 210_000
+private const val IV_SIZE = 12
+private const val KEY_SIZE_BYTES = 32
+
+@OptIn(dev.whyoleg.cryptography.DelicateCryptographyApi::class)
 actual object BackupCrypto {
+    private val provider get() = CryptographyProvider.Default
+    private val aesGcm get() = provider.get(AES.GCM)
+    private val pbkdf2 get() = provider.get(PBKDF2)
+
     actual suspend fun encryptBackupWithPassword(
         password: String,
         bundle: PrivateKeyBundle
     ): EncryptedBackupBlob = withContext(Dispatchers.Default) {
-        // iOS backup encryption is not implemented yet; fail fast if called.
+        val salt = CryptographyRandom.nextBytes(16)
-        error("Backup encryption is not yet implemented on iOS.")
+        val nonce = CryptographyRandom.nextBytes(IV_SIZE)
+
+        EncryptedBackupBlob(
+            salt,
+            nonce,
+            aesGcm
+                .keyDecoder()
+                .decodeFromByteArray(
+                    AES.Key.Format.RAW,
+                    pbkdf2
+                        .secretDerivation(
+                            digest = SHA256,
+                            iterations = PBKDF2_ITERATIONS,
+                            outputSize = KEY_SIZE_BYTES.bytes,
+                            salt = salt
+                        )
+                        .deriveSecretBlocking(
+                            password.encodeToByteArray()
+                        )
+                        .toByteArray()
+                )
+                .cipher(tagSize = 128.bits)
+                .encryptWithIv(nonce, serializeBundle(bundle))
+        )
     }
 
     actual suspend fun decryptBackupWithPassword(
         password: String,
         blob: EncryptedBackupBlob
     ): PrivateKeyBundle = withContext(Dispatchers.Default) {
-        // iOS backup decryption is not implemented yet; fail fast if called.
+        deserializeBundle(
-        error("Backup decryption is not yet implemented on iOS.")
+            aesGcm
+                .keyDecoder()
+                .decodeFromByteArray(
+                    AES.Key.Format.RAW,
+                    pbkdf2
+                        .secretDerivation(
+                            digest = SHA256,
+                            iterations = PBKDF2_ITERATIONS,
+                            outputSize = KEY_SIZE_BYTES.bytes,
+                            salt = blob.salt
+                        )
+                        .deriveSecretBlocking(
+                            password.encodeToByteArray()
+                        )
+                        .toByteArray()
+                )
+                .cipher(tagSize = 128.bits)
+                .decryptWithIv(blob.iv, blob.ciphertext)
+        )
     }
 
-    actual fun randomBytes(length: Int): ByteArray {
+    actual fun randomBytes(length: Int): ByteArray = CryptographyRandom.nextBytes(length)
-        val bytes = ByteArray(length)
-        Random.Default.nextBytes(bytes)
-        return bytes
-    }
 }

app/shared/src/iosMain/kotlin/ru/fromchat/crypto/dm/DmCrypto.ios.kt

@@ -1,79 +1,71 @@
 package ru.fromchat.crypto.dm
 
 import com.pr0gramm3r101.utils.crypto.Base64
-import com.pr0gramm3r101.utils.crypto.Hmac
+import com.pr0gramm3r101.utils.require
-import com.pr0gramm3r101.utils.crypto.PasswordHash
+import dev.whyoleg.cryptography.BinarySize.Companion.bits
-import kotlinx.cinterop.ExperimentalForeignApi
+import dev.whyoleg.cryptography.CryptographyProvider
-import kotlinx.cinterop.alloc
+import dev.whyoleg.cryptography.algorithms.AES
-import kotlinx.cinterop.allocArray
-import kotlinx.cinterop.addressOf
-import kotlinx.cinterop.memScoped
-import kotlinx.cinterop.ptr
-import kotlinx.cinterop.usePinned
-import kotlinx.cinterop.value
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import platform.CoreCrypto.CCCryptorCreateWithMode
-import platform.CoreCrypto.CCCryptorRelease
-import platform.CoreCrypto.CCCryptorUpdate
-import platform.CoreCrypto.CCCryptorFinal
-import platform.CoreCrypto.kCCAlgorithmAES
-import platform.CoreCrypto.kCCKeySizeAES256
-import platform.CoreCrypto.kCCDecrypt
-import platform.CoreCrypto.kCCSuccess
 
-// GCM mode constant (value 11) - CommonCrypto GCM support via cinterop is limited
+private const val AES_KEY_SIZE = 32
-private const val kCCModeGCM = 11u
+private const val GCM_IV_SIZE = 12
+private const val GCM_TAG_SIZE = 16
 
+@OptIn(dev.whyoleg.cryptography.DelicateCryptographyApi::class)
 actual object DmCrypto {
-    private const val AES_KEY_SIZE = 32
+    private val provider get() = CryptographyProvider.Default
-    private const val GCM_IV_SIZE = 12
+    private val aesGcm get() = provider.get(AES.GCM)
-    private const val GCM_TAG_SIZE = 16
 
-    @OptIn(ExperimentalForeignApi::class)
+    actual suspend fun unwrapMek(
-    actual suspend fun unwrapMek(wrappedMekB64: String, wrappingKey: ByteArray): ByteArray =
+        wrappedMekB64: String,
-        withContext(Dispatchers.Default) {
+        wrappingKey: ByteArray
-            require(wrappingKey.size == AES_KEY_SIZE) { "Wrapping key must be 32 bytes" }
+    ) = withContext(Dispatchers.Default) {
-            
+        require(wrappingKey.size == AES_KEY_SIZE) { "Wrapping key must be 32 bytes" }
-            val wrapped = Base64.decode(wrappedMekB64)
+        val wrapped = Base64.decode(wrappedMekB64)
-            require(wrapped.size >= GCM_IV_SIZE + GCM_TAG_SIZE) { "Wrapped MEK too short" }
+        require(wrapped.size >= GCM_IV_SIZE + GCM_TAG_SIZE) { "Wrapped MEK too short" }
-            
+
-            // Extract IV and ciphertext+tag
+        aesGcmDecrypt(
-            val iv = wrapped.sliceArray(0 until GCM_IV_SIZE)
+            wrappingKey,
-            val ciphertext = wrapped.sliceArray(GCM_IV_SIZE until wrapped.size)
+            wrapped.sliceArray(0 until GCM_IV_SIZE),
-            
+            wrapped.sliceArray(GCM_IV_SIZE until wrapped.size)
-            // Decrypt using AES-GCM
+        )
-            aesGcmDecrypt(wrappingKey, iv, ciphertext)
+    }
-        }
 
-    @OptIn(ExperimentalForeignApi::class)
     actual suspend fun decryptEnvelope(
         ivB64: String,
         ciphertextB64: String,
         mek: ByteArray
-    ): ByteArray = withContext(Dispatchers.Default) {
+    ) = withContext(Dispatchers.Default) {
-        require(mek.size == AES_KEY_SIZE) { "MEK must be 32 bytes" }
+        aesGcmDecrypt(
-        
+            mek.require("MEK must be 32 bytes") {
-        val iv = Base64.decode(ivB64)
+                it.size == AES_KEY_SIZE
-        val ciphertext = Base64.decode(ciphertextB64)
+            },
-        
+            Base64
-        require(iv.size == GCM_IV_SIZE) { "IV must be 12 bytes" }
+                .decode(ivB64)
-        require(ciphertext.size >= GCM_TAG_SIZE) { "Ciphertext too short" }
+                .require("IV must be 12 bytes") {
-        
+                    it.size == GCM_IV_SIZE
-        // Decrypt using AES-GCM
+                },
-        aesGcmDecrypt(mek, iv, ciphertext)
+            Base64
+                .decode(ciphertextB64)
+                .require("Ciphertext too short") {
+                    it.size >= GCM_TAG_SIZE
+                }
+        )
     }
 
-    @OptIn(ExperimentalForeignApi::class)
+    private suspend fun aesGcmDecrypt(key: ByteArray, iv: ByteArray, ciphertext: ByteArray): ByteArray {
-    private fun aesGcmDecrypt(key: ByteArray, iv: ByteArray, ciphertext: ByteArray): ByteArray {
         require(iv.size == GCM_IV_SIZE) { "IV must be 12 bytes for GCM" }
-        require(key.size == AES_KEY_SIZE) { "Key must be 32 bytes (256 bits)" }
+        require(key.size == AES_KEY_SIZE) { "Key must be 32 bytes" }
         require(ciphertext.size >= GCM_TAG_SIZE) { "Ciphertext too short" }
-        
+
-        // TODO: Implement proper AES-GCM using CommonCrypto or CryptoKit
+        return aesGcm
-        // See BackupCrypto.ios.kt for implementation notes.
+            .keyDecoder()
-        // For now, delegate to BackupCrypto's implementation when available.
+            .decodeFromByteArray(
-        
+                AES.Key.Format.RAW,
-        error("AES-GCM decryption not yet implemented for iOS. Use CryptoKit via Swift interop or krypto library.")
+                key
+            )
+            .cipher(tagSize = 128.bits)
+            .decryptWithIv(iv, ciphertext)
     }
 }

app/shared/src/iosMain/kotlin/ru/fromchat/crypto/transport/TransportCrypto.ios.kt

@@ -1,5 +1,10 @@
 package ru.fromchat.crypto.transport
 
+import com.ionspin.kotlin.crypto.LibsodiumInitializer
+import com.ionspin.kotlin.crypto.box.Box
+import com.ionspin.kotlin.crypto.box.crypto_box_NONCEBYTES
+import com.ionspin.kotlin.crypto.util.LibsodiumRandom
+import com.pr0gramm3r101.utils.crypto.Base64
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
@@ -7,8 +12,24 @@ actual object TransportCrypto {
     actual suspend fun encryptWithTransportKey(
         plaintext: String,
         transportPublicKeyB64: String
-    ): TransportCiphertext = withContext(Dispatchers.Default) {
+    ) = withContext(Dispatchers.Default) {
-        error("TransportCrypto.encryptWithTransportKey is not yet implemented on iOS.")
+        if (!LibsodiumInitializer.isInitialized()) {
+            LibsodiumInitializer.initialize()
+        }
+
+        val keyPair = Box.keypair()
+        val nonce = LibsodiumRandom.buf(crypto_box_NONCEBYTES)
+        val ciphertext = Box.easy(
+            plaintext.encodeToByteArray().toUByteArray(),
+            nonce,
+            Base64.decode(transportPublicKeyB64).toUByteArray(),
+            keyPair.secretKey
+        )
+
+        TransportCiphertext(
+            clientPublicKeyB64 = Base64.encode(keyPair.publicKey.toByteArray()),
+            nonceB64 = Base64.encode(nonce.toByteArray()),
+            ciphertextB64 = Base64.encode(ciphertext.toByteArray())
+        )
     }
 }
-

app/shared/src/iosMain/kotlin/ru/fromchat/fcm/FcmRegistration.ios.kt

@@ -1,3 +1,5 @@
 package ru.fromchat.fcm
 
-actual suspend fun uploadPendingFcmTokenIfAvailable() {}
+actual suspend fun uploadPendingFcmTokenIfAvailable() {
+    // This should remain a placeholder because iOS is stupid
+}

app/shared/src/iosMain/kotlin/ru/fromchat/ui/BackHandler.ios.kt

@@ -1,11 +1,27 @@
 package ru.fromchat.ui
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import kotlinx.cinterop.ExperimentalForeignApi
+import platform.UIKit.UIImpactFeedbackGenerator
+import platform.UIKit.UIImpactFeedbackStyle
 
 @Composable
 actual fun BackHandler(enabled: Boolean, onBack: () -> Unit) {
     // iOS has no system back button; back is handled by navigation.
 }
 
+@OptIn(ExperimentalForeignApi::class)
 @Composable
-actual fun rememberHapticFeedbackInternal(): (Int) -> Unit = { }
+actual fun rememberHapticFeedbackInternal(): (Int) -> Unit {
+    return remember {
+        { ordinal ->
+            val style: UIImpactFeedbackStyle = when (ordinal) {
+                HapticFeedbackEvent.MessageSent.ordinal -> UIImpactFeedbackStyle.UIImpactFeedbackStyleMedium
+                else -> UIImpactFeedbackStyle.UIImpactFeedbackStyleLight
+            }
+            val generator = UIImpactFeedbackGenerator(style)
+            generator.impactOccurred()
+        }
+    }
+}

app/shared/src/iosMain/kotlin/ru/fromchat/ui/NotificationUtils.ios.kt

@@ -1 +0,0 @@
-

app/shared/src/iosMain/kotlin/ru/fromchat/ui/Theme.ios.kt

@@ -6,5 +6,4 @@ import androidx.compose.runtime.Composable
 
 @Composable
 actual fun getColorScheme(darkTheme: Boolean, dynamicColor: Boolean) =
-    if (darkTheme) darkColorScheme()
+    if (darkTheme) darkColorScheme() else lightColorScheme()
-    else lightColorScheme()

app/shared/src/iosMain/kotlin/ru/fromchat/ui/debug/DebugApiScreen.ios.kt

@@ -1,9 +1,291 @@
 package ru.fromchat.ui.debug
 
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.BugReport
+import androidx.compose.material3.Button
+import androidx.compose.material3.DividerDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.pr0gramm3r101.utils.settings.settings
+import kotlinx.coroutines.launch
+import ru.fromchat.api.ApiClient
+import ru.fromchat.crypto.IdentityKeyManager
+import ru.fromchat.crypto.decryptEnvelope
+import ru.fromchat.ui.LocalNavController
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 actual fun DebugApiScreen() {
-    // iOS debug UI not implemented; Android-only for now.
+    val navController = LocalNavController.current
-}
+    val scope = rememberCoroutineScope()
+    val scrollState = rememberScrollState()
 
+    var statusMessage by rememberSaveable { mutableStateOf("") }
+    var profileResult by rememberSaveable { mutableStateOf<String?>(null) }
+    var conversationsResult by rememberSaveable { mutableStateOf<String?>(null) }
+    var historyResult by rememberSaveable { mutableStateOf<String?>(null) }
+    var historyUserId by rememberSaveable { mutableStateOf("0") }
+    var decryptedMessage by rememberSaveable { mutableStateOf<String?>(null) }
+    var sendRecipientId by rememberSaveable { mutableStateOf("") }
+    var sendMessageText by rememberSaveable { mutableStateOf("") }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                navigationIcon = {
+                    IconButton(onClick = { navController.navigateUp() }) {
+                        Icon(imageVector = Icons.AutoMirrored.Filled.ArrowBack, contentDescription = null)
+                    }
+                },
+                title = {
+                    Text(text = "Debug API")
+                },
+                actions = {
+                    IconButton(onClick = {}) {
+                        Icon(imageVector = Icons.Filled.BugReport, contentDescription = null)
+                    }
+                }
+            )
+        }
+    ) { innerPadding ->
+        Column(
+            modifier = Modifier
+                .padding(innerPadding)
+                .verticalScroll(scrollState)
+                .padding(16.dp),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            Text(
+                text = statusMessage.takeIf { it.isNotBlank() }
+                    ?: "Status will appear here",
+                style = MaterialTheme.typography.bodyMedium
+            )
+
+            Button(
+                onClick = {
+                    scope.launch {
+                        runCatching { ApiClient.getOwnProfile() }
+                            .onSuccess {
+                                profileResult = ApiClient.json.encodeToString(it)
+                                statusMessage = "Profile loaded"
+                            }
+                            .onFailure {
+                                statusMessage = it.message ?: "An unknown error occurred"
+                            }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(text = "Load own profile")
+            }
+
+            Text(
+                text = profileResult ?: "No data loaded yet",
+                style = MaterialTheme.typography.bodySmall,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            Button(
+                onClick = {
+                    scope.launch {
+                        runCatching { ApiClient.getDmConversations() }
+                            .onSuccess {
+                                conversationsResult = ApiClient.json.encodeToString(it)
+                                statusMessage = "Conversations loaded"
+                            }
+                            .onFailure {
+                                statusMessage = it.message ?: "An unknown error occurred"
+                            }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(text = "Load DM conversations")
+            }
+
+            Text(
+                text = conversationsResult ?: "No data loaded yet",
+                style = MaterialTheme.typography.bodySmall,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            OutlinedTextField(
+                value = historyUserId,
+                onValueChange = { historyUserId = it },
+                label = { Text(text = "History user ID") },
+                singleLine = true,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            Button(
+                onClick = {
+                    val userId = historyUserId.toIntOrNull()
+                    if (userId == null) {
+                        statusMessage = "Enter a valid user ID"
+                        return@Button
+                    }
+
+                    scope.launch {
+                        runCatching { ApiClient.getDmHistory(userId) }
+                            .onSuccess {
+                                historyResult = ApiClient.json.encodeToString(it)
+                                statusMessage = "DM history loaded"
+                            }
+                            .onFailure {
+                                statusMessage = it.message ?: "An unknown error occurred"
+                            }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(text = "Load DM history")
+            }
+
+            Text(
+                text = historyResult ?: "No data loaded yet",
+                style = MaterialTheme.typography.bodySmall,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            HorizontalDivider(
+                modifier = Modifier.padding(vertical = 8.dp),
+                thickness = DividerDefaults.Thickness,
+                color = DividerDefaults.color
+            )
+
+            Text(
+                text = "DM Send Test",
+                style = MaterialTheme.typography.titleMedium,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            OutlinedTextField(
+                value = sendRecipientId,
+                onValueChange = { sendRecipientId = it },
+                label = { Text(text = "Recipient user ID") },
+                singleLine = true,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            OutlinedTextField(
+                value = sendMessageText,
+                onValueChange = { sendMessageText = it },
+                label = { Text(text = "Message text") },
+                singleLine = false,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            Button(
+                onClick = {
+                    val userId = sendRecipientId.toIntOrNull()
+                    if (userId == null) {
+                        statusMessage = "Enter a valid recipient ID"
+                        return@Button
+                    }
+                    if (sendMessageText.isBlank()) {
+                        statusMessage = "Enter a message to send"
+                        return@Button
+                    }
+
+                    scope.launch {
+                        runCatching {
+                            ApiClient.sendDm(
+                                recipientId = userId,
+                                plaintext = sendMessageText.trim(),
+                                replyToId = null
+                            )
+                        }.onSuccess {
+                            statusMessage = "DM sent successfully"
+                        }.onFailure {
+                            statusMessage = it.message ?: "Failed to send DM"
+                        }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(text = "Send DM")
+            }
+
+            HorizontalDivider(
+                modifier = Modifier.padding(vertical = 8.dp),
+                thickness = DividerDefaults.Thickness,
+                color = DividerDefaults.color
+            )
+
+            Text(
+                text = "DM Decryption Test",
+                style = MaterialTheme.typography.titleMedium,
+                modifier = Modifier.fillMaxWidth()
+            )
+
+            Button(
+                onClick = {
+                    val userId = historyUserId.toIntOrNull()
+                    if (userId == null) {
+                        statusMessage = "Enter a valid user ID"
+                        return@Button
+                    }
+
+                    scope.launch {
+                        try {
+                            IdentityKeyManager.restoreFromLocal()
+
+                            val history = ApiClient.getDmHistory(userId)
+                            if (history.messages.isEmpty()) {
+                                statusMessage = "No messages found"
+                                decryptedMessage = null
+                                return@launch
+                            }
+
+                            val currentUserId = settings.getInt("current_user_id", 0)
+                            if (currentUserId == 0) {
+                                statusMessage = "Current user ID not found"
+                                decryptedMessage = null
+                                return@launch
+                            }
+
+                            val firstEnvelope = history.messages.first()
+                            val plaintext = decryptEnvelope(firstEnvelope, currentUserId)
+                            decryptedMessage = "Decrypted: $plaintext"
+                            statusMessage = "Decryption successful"
+                        } catch (e: Exception) {
+                            statusMessage = "Decryption failed: ${e.message}"
+                            decryptedMessage = "Error: ${e.message}\n${e.stackTraceToString()}"
+                        }
+                    }
+                },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text(text = "Decrypt First DM")
+            }
+
+            Text(
+                text = decryptedMessage ?: "No decrypted message yet",
+                style = MaterialTheme.typography.bodySmall,
+                modifier = Modifier.fillMaxWidth()
+            )
+        }
+    }
+}

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 agp = "9.0.0"
-androidx-activityCompose = "1.12.2"
+androidx-activityCompose = "1.12.3"
 androidx-appcompat = "1.7.1"
 androidx-core-ktx = "1.17.0"
 coilCompose = "3.3.0"
@@ -11,7 +11,7 @@ coreSplashscreen = "1.2.0"
 firebaseMessaging = "25.0.1"
 googleServices = "4.4.4"
 haze = "1.7.1"
-kotlin = "2.3.0"
+kotlin = "2.3.10"
 adaptiveAndroid = "1.2.0"
 biometric = "1.4.0-alpha05"
 gson = "2.13.2"
@@ -19,19 +19,19 @@ kotlinxIoBytestring = "0.8.2"
 kotlinxCoroutinesCore = "1.10.2"
 kotlinxIoCore = "0.8.2"
 multiplatformSettings = "1.3.0"
-serialization = "2.3.0"
+serialization-json = "1.10.0"
-serialization-json = "1.9.0"
 material = "1.13.0"
-activityKtx = "1.12.2"
+activityKtx = "1.12.3"
 navigationCompose = "2.9.1"
 datastore = "1.2.0"
 security-crypto = "1.1.0"
-ktor = "3.3.3"
+ktor = "3.4.0"
 slf4j = "1.7.36"
 kotlinxDatetime = "0.7.1"
+cryptography-kotlin = "0.5.0"
 krypto = "4.0.10"
 lifecycleRuntimeKtx = "2.10.0"
-composeBom = "2026.01.00"
+composeBom = "2026.01.01"
 composeMaterialIconsExtended = "1.7.3"
 composeMaterial3 = "1.10.0-alpha05"
 composeComponents = "1.10.0"
@@ -91,6 +91,8 @@ compose-components-resources = { module = "org.jetbrains.compose.components:comp
 compose-ui-tooling-preview = { module = "org.jetbrains.compose.ui:ui-tooling-preview", version.ref = "compose-multiplatform" }
 compose-materialIconsExtended = { module = "org.jetbrains.compose.material:material-icons-extended", version.ref = "composeMaterialIconsExtended" }
 krypto = { module = "com.soywiz.korlibs.krypto:krypto", version.ref = "krypto" }
+cryptography-core = { module = "dev.whyoleg.cryptography:cryptography-core", version.ref = "cryptography-kotlin" }
+cryptography-provider-optimal = { module = "dev.whyoleg.cryptography:cryptography-provider-optimal", version.ref = "cryptography-kotlin" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
@@ -99,5 +101,5 @@ compose-compiler = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "
 kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 kotlin-multiplatform-library = { id = "com.android.kotlin.multiplatform.library", version.ref = "agp" }
 android-library = { id = "com.android.library", version.ref = "agp" }
-kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "serialization" }
+kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 google-services = { id = "com.google.gms.google-services", version.ref = "googleServices" }

utils/shared/src/commonMain/kotlin/com/pr0gramm3r101/utils/Utils.kt

@@ -175,4 +175,9 @@ operator fun PaddingValues.plus(other: PaddingValues) = PaddingValues(
     }
 )
 
-expect val materialYouAvailable: Boolean
+expect val materialYouAvailable: Boolean
+
+inline fun <T> T.require( message: String, condition: (T) -> Boolean): T {
+    require(condition(this)) { message }
+    return this
+}