Полное управление шифрованием и ключами

app/src/main/java/com/github/nullptroma/wallenc/app/di/modules/domain/UseCasesModule.kt

@@ -43,7 +43,9 @@ class UseCasesModule {
 
     @Provides
     @Singleton
-    fun provideManageStoragesEncryptionUseCase(unlockManager: IUnlockManager): ManageStoragesEncryptionUseCase {
+    fun provideManageStoragesEncryptionUseCase(
+        unlockManager: IUnlockManager,
+    ): ManageStoragesEncryptionUseCase {
         return ManageStoragesEncryptionUseCase(unlockManager)
     }
 
@@ -52,7 +54,8 @@ class UseCasesModule {
     fun provideRemoveStorageUseCase(
         vaultsManager: IVaultsManager,
         unlockManager: IUnlockManager,
+        manageStoragesEncryptionUseCase: ManageStoragesEncryptionUseCase,
     ): RemoveStorageUseCase {
-        return RemoveStorageUseCase(vaultsManager, unlockManager)
+        return RemoveStorageUseCase(vaultsManager, unlockManager, manageStoragesEncryptionUseCase)
     }
 }

data/src/main/java/com/github/nullptroma/wallenc/data/db/app/AppDb.kt

@@ -12,7 +12,7 @@ interface IAppDb {
     val storageMetaInfoDao: StorageMetaInfoDao
 }
 
-@Database(entities = [DbStorageKeyMap::class, DbStorageMetaInfo::class], version = 2, exportSchema = false)
+@Database(entities = [DbStorageKeyMap::class, DbStorageMetaInfo::class], version = 3, exportSchema = false)
 abstract class AppDb : IAppDb, RoomDatabase() {
     abstract override val storageKeyMapDao: StorageKeyMapDao
     abstract override val storageMetaInfoDao: StorageMetaInfoDao

data/src/main/java/com/github/nullptroma/wallenc/data/db/app/model/DbStorageKeyMap.kt

@@ -7,16 +7,15 @@ import com.github.nullptroma.wallenc.data.model.StorageKeyMap
 import com.github.nullptroma.wallenc.domain.datatypes.EncryptKey
 import java.util.UUID
 
-@Entity(tableName = "storage_key_maps", primaryKeys = [ "source_uuid", "dest_uuid" ])
+@Entity(tableName = "storage_key_maps")
 data class DbStorageKeyMap(
+    @androidx.room.PrimaryKey
     @ColumnInfo(name = "source_uuid") val sourceUuid: UUID,
-    @ColumnInfo(name = "dest_uuid") val destUuid: UUID,
     @ColumnInfo(name = "key") val key: ByteArray
 ) {
     fun toModel(): StorageKeyMap {
         return StorageKeyMap(
             sourceUuid = sourceUuid,
-            destUuid = destUuid,
             key = EncryptKey(key)
         )
     }
@@ -28,7 +27,6 @@ data class DbStorageKeyMap(
         other as DbStorageKeyMap
 
         if (sourceUuid != other.sourceUuid) return false
-        if (destUuid != other.destUuid) return false
         if (!key.contentEquals(other.key)) return false
 
         return true
@@ -36,7 +34,6 @@ data class DbStorageKeyMap(
 
     override fun hashCode(): Int {
         var result = sourceUuid.hashCode()
-        result = 31 * result + destUuid.hashCode()
         result = 31 * result + key.contentHashCode()
         return result
     }
@@ -45,7 +42,6 @@ data class DbStorageKeyMap(
         fun fromModel(keymap: StorageKeyMap): DbStorageKeyMap {
             return DbStorageKeyMap(
                 sourceUuid = keymap.sourceUuid,
-                destUuid = keymap.destUuid,
                 key = keymap.key.bytes
             )
         }

data/src/main/java/com/github/nullptroma/wallenc/data/model/StorageKeyMap.kt

@@ -6,6 +6,5 @@ import java.util.UUID
 
 data class StorageKeyMap(
     val sourceUuid: UUID,
-    val destUuid: UUID,
     val key: EncryptKey
 )

data/src/main/java/com/github/nullptroma/wallenc/data/storages/UnlockManager.kt

@@ -17,6 +17,8 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.withContext
+import java.nio.ByteBuffer
+import java.security.MessageDigest
 import java.util.UUID
 
 class UnlockManager(
@@ -45,7 +47,7 @@ class UnlockManager(
                             continue
                         }
                         try {
-                            val encStorage = createEncryptedStorage(storage, key.key, key.destUuid)
+                            val encStorage = createEncryptedStorage(storage, key.key, getDestUuid(storage.uuid))
                             map[storage.uuid] = encStorage
                             allStorages.removeAt(allStorages.size - 1)
                             allStorages.add(encStorage)
@@ -72,9 +74,34 @@ class UnlockManager(
         )
     }
 
+    private fun getDestUuid(sourceUuid: UUID): UUID {
+        return uuid5(
+            namespace = UUID.fromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8"), // URL namespace
+            name = "$sourceUuid:open"
+        )
+    }
+
+    private fun uuid5(namespace: UUID, name: String): UUID {
+        val digest = MessageDigest.getInstance("SHA-1")
+        val nsBytes = ByteBuffer.allocate(16)
+            .putLong(namespace.mostSignificantBits)
+            .putLong(namespace.leastSignificantBits)
+            .array()
+        digest.update(nsBytes)
+        digest.update(name.toByteArray(Charsets.UTF_8))
+        val hash = digest.digest()
+
+        hash[6] = (hash[6].toInt() and 0x0f or 0x50).toByte() // version 5
+        hash[8] = (hash[8].toInt() and 0x3f or 0x80).toByte() // RFC 4122 variant
+
+        val bb = ByteBuffer.wrap(hash, 0, 16)
+        return UUID(bb.long, bb.long)
+    }
+
     override suspend fun open(
         storage: IStorage,
-        key: EncryptKey
+        key: EncryptKey,
+        rememberPassword: Boolean
     ): EncryptedStorage = withContext(ioDispatcher) {
         return@withContext mutex.withLock {
             val encInfo = storage.metaInfo.value.encInfo ?: throw Exception("EncInfo is null") // TODO
@@ -84,17 +111,18 @@ class UnlockManager(
             val opened = _openedStorages.value.toMutableMap()
             val cur = opened[storage.uuid]
             if (cur != null)
-                throw Exception("Storage is already open")
+                return@withLock cur
 
             val keymap = StorageKeyMap(
                 sourceUuid = storage.uuid,
-                destUuid = UUID.randomUUID(),
                 key = key
             )
-            val encStorage = createEncryptedStorage(storage, keymap.key, keymap.destUuid)
+            val encStorage = createEncryptedStorage(storage, keymap.key, getDestUuid(storage.uuid))
             opened[storage.uuid] = encStorage
             _openedStorages.value = opened
+            if (rememberPassword) {
                 keymapRepository.add(keymap)
+            }
             encStorage
         }
     }
@@ -111,30 +139,21 @@ class UnlockManager(
         }
     }
 
-    // Закрытие отображения по экземпляру (source или decrypted).
+    // Закрытие только по source-экземпляру.
     override suspend fun close(storage: IStorage) {
         val opened = _openedStorages.value
-        val source = opened.entries.firstOrNull {
+        if (opened.containsKey(storage.uuid)) {
-            it.key == storage.uuid || it.value.uuid == storage.uuid
+            close(storage.uuid)
         }
-        if (source != null)
-            close(source.key)
     }
 
     private suspend fun closeBySourceUuid(opened: MutableMap<UUID, EncryptedStorage>, sourceUuid: UUID) {
         val enc = opened[sourceUuid] ?: return
-        val childSourceUuid = opened.entries.firstOrNull { it.value.uuid == enc.uuid }?.key
+        val nestedSourceUuid = enc.uuid
-        if (childSourceUuid != null) {
+        if (nestedSourceUuid != sourceUuid && opened.containsKey(nestedSourceUuid)) {
-            closeBySourceUuid(opened, childSourceUuid)
+            closeBySourceUuid(opened, nestedSourceUuid)
         }
         opened.remove(sourceUuid)
         enc.dispose()
-        keymapRepository.delete(
-            StorageKeyMap(
-                sourceUuid = sourceUuid,
-                destUuid = enc.uuid,
-                key = EncryptKey("")
-            )
-        )
     }
 }

data/src/main/java/com/github/nullptroma/wallenc/data/storages/encrypt/EncryptedStorage.kt

@@ -12,6 +12,7 @@ import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.DisposableHandle
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.map
@@ -35,6 +36,8 @@ class EncryptedStorage private constructor(
         get() = accessor.size
     override val numberOfFiles: StateFlow<Int?>
         get() = accessor.numberOfFiles
+    override val isEmpty: Flow<Boolean?>
+        get() = accessor.numberOfFiles.map { n -> n?.let { it == 0 } }
 
     private val _metaInfo = MutableStateFlow<IStorageMetaInfo>(
         CommonStorageMetaInfo()
@@ -102,7 +105,7 @@ class EncryptedStorage private constructor(
         )
     }
 
-    override suspend fun setEncInfo(encInfo: StorageEncryptionInfo) = scope.run {
+    override suspend fun setEncInfo(encInfo: StorageEncryptionInfo?) = scope.run {
         val curMeta = metaInfo.value
         updateMetaInfo(
             CommonStorageMetaInfo(
@@ -112,6 +115,20 @@ class EncryptedStorage private constructor(
         )
     }
 
+    override suspend fun clearAllContent() = scope.run {
+        val files = accessor.getAllFiles()
+        val dirs = accessor.getAllDirs()
+        val paths = buildList {
+            addAll(files.map { it.metaInfo.path })
+            addAll(dirs.map { it.metaInfo.path })
+        }
+            .filter { it != "/" && it.isNotBlank() }
+            .sortedByDescending { it.length }
+        for (path in paths) {
+            accessor.delete(path)
+        }
+    }
+
     override fun dispose() {
         accessor.dispose()
         job.cancel()

data/src/main/java/com/github/nullptroma/wallenc/data/storages/local/LocalStorage.kt

@@ -7,8 +7,10 @@ import com.github.nullptroma.wallenc.domain.interfaces.IStorage
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageAccessor
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageMetaInfo
 import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import java.io.InputStream
 import java.util.UUID
@@ -23,6 +25,8 @@ class LocalStorage(
         get() = accessor.size
     override val numberOfFiles: StateFlow<Int?>
         get() = accessor.numberOfFiles
+    override val isEmpty: Flow<Boolean?>
+        get() = accessor.numberOfFiles.map { n -> n?.let { it == 0 } }
 
     private val _metaInfo = MutableStateFlow<IStorageMetaInfo>(
         CommonStorageMetaInfo()
@@ -82,7 +86,7 @@ class LocalStorage(
         ))
     }
 
-    override suspend fun setEncInfo(encInfo: StorageEncryptionInfo) = withContext(ioDispatcher) {
+    override suspend fun setEncInfo(encInfo: StorageEncryptionInfo?) = withContext(ioDispatcher) {
         val curMeta = metaInfo.value
         updateMetaInfo(CommonStorageMetaInfo(
             encInfo = encInfo,
@@ -90,6 +94,20 @@ class LocalStorage(
         ))
     }
 
+    override suspend fun clearAllContent() = withContext(ioDispatcher) {
+        val files = accessor.getAllFiles()
+        val dirs = accessor.getAllDirs()
+        val paths = buildList {
+            addAll(files.map { it.metaInfo.path })
+            addAll(dirs.map { it.metaInfo.path })
+        }
+            .filter { it != "/" && it.isNotBlank() }
+            .sortedByDescending { it.length }
+        for (path in paths) {
+            accessor.delete(path)
+        }
+    }
+
     companion object {
         const val STORAGE_INFO_FILE_POSTFIX = ".storage-info"
         private val jackson = jacksonObjectMapper().apply { findAndRegisterModules() }

data/src/main/java/com/github/nullptroma/wallenc/data/storages/local/LocalStorageAccessor.kt

@@ -494,10 +494,15 @@ class LocalStorageAccessor(
     }
 
     override suspend fun delete(path: String) = withContext(ioDispatcher) {
+        if (path == "/" || path.isBlank()) {
+            throw IllegalArgumentException("Deleting root path is forbidden")
+        }
         val pair = LocalStorageFilePair.from(_filesystemBasePath, path)
         if (pair != null) {
-            pair.file.delete()
+            if (pair.file.isDirectory) pair.file.deleteRecursively()
+            else pair.file.delete()
             pair.metaFile.delete()
+            scanSizeAndNumOfFiles()
         }
     }
 

domain/src/main/java/com/github/nullptroma/wallenc/domain/enums/StorageDeletionPolicy.kt

@@ -1,15 +0,0 @@
-package com.github.nullptroma.wallenc.domain.enums
-
-/**
- * Политика удаления/закрытия хранилища.
- *
- * [CLOSE_ENCRYPTED_OVERLAYS_ONLY] — только закрыть расшифрованные представления (overlay),
- * физические данные не трогаем.
- *
- * [REMOVE_PHYSICAL] — удалить физическое хранилище у провайдера (сейчас local vault),
- * предварительно закрыв все overlay.
- */
-enum class StorageDeletionPolicy {
-    CLOSE_ENCRYPTED_OVERLAYS_ONLY,
-    REMOVE_PHYSICAL,
-}

domain/src/main/java/com/github/nullptroma/wallenc/domain/interfaces/IStorage.kt

@@ -1,6 +1,7 @@
 package com.github.nullptroma.wallenc.domain.interfaces
 
 import com.github.nullptroma.wallenc.domain.datatypes.StorageEncryptionInfo
+import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.StateFlow
 import java.time.Instant
 import java.util.UUID
@@ -10,6 +11,7 @@ sealed interface IStorageInfo {
     val isAvailable: StateFlow<Boolean>
     val size: StateFlow<Long?>
     val numberOfFiles: StateFlow<Int?>
+    val isEmpty: Flow<Boolean?>
     val metaInfo: StateFlow<IStorageMetaInfo>
     val isVirtualStorage: Boolean
 }
@@ -18,7 +20,8 @@ interface IStorage: IStorageInfo {
     val accessor: IStorageAccessor
 
     suspend fun rename(newName: String)
-    suspend fun setEncInfo(encInfo: StorageEncryptionInfo)
+    suspend fun setEncInfo(encInfo: StorageEncryptionInfo?)
+    suspend fun clearAllContent()
 }
 
 interface IStorageMetaInfo {

domain/src/main/java/com/github/nullptroma/wallenc/domain/interfaces/IUnlockManager.kt

@@ -14,7 +14,7 @@ interface IUnlockManager {
      */
     val openedStorages: StateFlow<Map<UUID, IStorage>>
 
-    suspend fun open(storage: IStorage, key: EncryptKey): IStorage
+    suspend fun open(storage: IStorage, key: EncryptKey, rememberPassword: Boolean = true): IStorage
     suspend fun close(storage: IStorage)
     suspend fun close(uuid: UUID): Unit
 }

domain/src/main/java/com/github/nullptroma/wallenc/domain/usecases/ManageStoragesEncryptionUseCase.kt

@@ -5,23 +5,70 @@ import com.github.nullptroma.wallenc.domain.encrypt.Encryptor
 import com.github.nullptroma.wallenc.domain.interfaces.IStorage
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageInfo
 import com.github.nullptroma.wallenc.domain.interfaces.IUnlockManager
+import kotlinx.coroutines.flow.first
+
+class ManageStoragesEncryptionUseCase(
+    private val unlockManager: IUnlockManager,
+) {
+    sealed interface CanEncryptResult {
+        data object Allowed : CanEncryptResult
+        data object UnsupportedStorageType : CanEncryptResult
+        data object AlreadyEncrypted : CanEncryptResult
+        data object StorageIsNotEmpty : CanEncryptResult
+        data object StorageStateUnknown : CanEncryptResult
+    }
+
+    suspend fun canEncrypt(storage: IStorageInfo): CanEncryptResult {
+        if (storage !is IStorage) return CanEncryptResult.UnsupportedStorageType
+        if (storage.metaInfo.value.encInfo != null) return CanEncryptResult.AlreadyEncrypted
+
+        val isEmpty = storage.isEmpty.first()
+        return when (isEmpty) {
+            true -> CanEncryptResult.Allowed
+            false -> CanEncryptResult.StorageIsNotEmpty
+            null -> CanEncryptResult.StorageStateUnknown
+        }
+    }
 
-class ManageStoragesEncryptionUseCase(private val unlockManager: IUnlockManager) {
     suspend fun enableEncryption(storage: IStorageInfo, key: EncryptKey, encryptPath: Boolean) {
-        when(storage) {
+        when (val result = canEncrypt(storage)) {
-            is IStorage -> {
+            CanEncryptResult.Allowed -> (storage as IStorage).setEncInfo(
-                if(storage.metaInfo.value.encInfo != null)
+                Encryptor.generateEncryptionInfo(key, encryptPath)
-                    throw Exception() // TODO
+            )
-                storage.setEncInfo(Encryptor.generateEncryptionInfo(key, encryptPath))
+            CanEncryptResult.AlreadyEncrypted -> throw IllegalStateException("Storage is already encrypted")
-            }
+            CanEncryptResult.StorageIsNotEmpty -> throw IllegalStateException("Storage is not empty")
+            CanEncryptResult.StorageStateUnknown -> throw IllegalStateException("Storage state is unknown")
+            CanEncryptResult.UnsupportedStorageType -> throw IllegalStateException("Unsupported storage type")
         }
     }
 
-    suspend fun openStorage(storage: IStorageInfo, key: EncryptKey): IStorageInfo {
+    suspend fun openStorage(storage: IStorageInfo, key: EncryptKey, rememberPassword: Boolean): IStorageInfo {
-        when(storage) {
+        if (storage is IStorage) return unlockManager.open(storage, key, rememberPassword)
-            is IStorage -> {
+        throw IllegalStateException("Unsupported storage type")
-                return unlockManager.open(storage, key)
+    }
+
+    suspend fun closeStorage(storage: IStorageInfo) {
+        if (storage is IStorage) {
+            unlockManager.close(storage)
         }
     }
+
+    suspend fun disableEncryption(storage: IStorageInfo) {
+        clearAndDisableEncryption(storage)
+    }
+
+    suspend fun clearAndDisableEncryption(storage: IStorageInfo) {
+        if (storage !is IStorage) return
+        storage.clearAllContent()
+        storage.setEncInfo(null)
+        unlockManager.close(storage)
+    }
+
+    suspend fun changePassword(storage: IStorageInfo, newKey: EncryptKey, encryptPath: Boolean) {
+        if (storage !is IStorage) return
+        if (storage.metaInfo.value.encInfo == null) {
+            throw IllegalStateException("Storage is not encrypted")
+        }
+        storage.setEncInfo(Encryptor.generateEncryptionInfo(newKey, encryptPath))
     }
 }

domain/src/main/java/com/github/nullptroma/wallenc/domain/usecases/RemoveStorageUseCase.kt

@@ -1,6 +1,5 @@
 package com.github.nullptroma.wallenc.domain.usecases
 
-import com.github.nullptroma.wallenc.domain.enums.StorageDeletionPolicy
 import com.github.nullptroma.wallenc.domain.interfaces.IStorage
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageInfo
 import com.github.nullptroma.wallenc.domain.interfaces.IUnlockManager
@@ -10,36 +9,30 @@ import java.util.UUID
 class RemoveStorageUseCase(
     private val vaultsManager: IVaultsManager,
     private val unlockManager: IUnlockManager,
+    private val manageStoragesEncryptionUseCase: ManageStoragesEncryptionUseCase,
 ) {
 
-    suspend fun remove(storage: IStorageInfo, policy: StorageDeletionPolicy) {
+    suspend fun remove(storage: IStorageInfo) {
+        
         if (storage !is IStorage) return
 
-        when (policy) {
+        if (!storage.isVirtualStorage) {
-            StorageDeletionPolicy.CLOSE_ENCRYPTED_OVERLAYS_ONLY -> {
             unlockManager.close(storage)
-            }
+            vaultsManager.localVault.remove(storage)
-            StorageDeletionPolicy.REMOVE_PHYSICAL -> {
+            return
-                val physical = findPhysicalRootStorage(storage) ?: return
-                unlockManager.close(physical.uuid)
-                vaultsManager.localVault.remove(physical)
-            }
-        }
         }
 
-    /**
+        val parent = findParentStorage(storage) ?: return
-     * Поднимается по цепочке overlay (sourceUuid -> decrypted view), пока не дойдёт
+        manageStoragesEncryptionUseCase.clearAndDisableEncryption(parent)
-     * до корневого физического storage из [IVaultsManager.localVault].
+    }
-     */
+
-    private fun findPhysicalRootStorage(storage: IStorage): IStorage? {
+
-        val locals = vaultsManager.localVault.storages.value ?: return null
+    private fun findParentStorage(storage: IStorage): IStorage? {
         val opened = unlockManager.openedStorages.value
+        val parentUuid = opened.entries.firstOrNull { it.value.uuid == storage.uuid }?.key ?: return null
+        val locals = vaultsManager.localVault.storages.value.orEmpty()
+        return locals.firstOrNull { it.uuid == parentUuid }
+            ?: opened[parentUuid]
+    }
 
-        var id: UUID = storage.uuid
-        while (true) {
-            val parent = opened.entries.firstOrNull { it.value.uuid == id }?.key ?: break
-            id = parent
-        }
-        return locals.firstOrNull { it.uuid == id }
-    }
 }

presentation/src/main/java/com/github/nullptroma/wallenc/presentation/elements/Dialogs.kt

@@ -8,6 +8,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
+import androidx.compose.material3.Checkbox
 import androidx.compose.material3.BasicAlertDialog
 import androidx.compose.material3.Button
 import androidx.compose.material3.Card
@@ -21,6 +22,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.focus.FocusRequester
 import androidx.compose.ui.focus.focusRequester
@@ -93,3 +95,98 @@ fun ConfirmationCancelOkDialog(onDismiss: () -> Unit, onConfirmation: () -> Unit
         }
     }
 }
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun EncryptionSetupDialog(
+    onDismiss: () -> Unit,
+    onConfirmation: (password: String, encryptPath: Boolean) -> Unit,
+) {
+    var password by remember { mutableStateOf("") }
+    var encryptPath by remember { mutableStateOf(false) }
+    BasicAlertDialog(onDismissRequest = onDismiss) {
+        Card {
+            Column(modifier = Modifier.padding(12.dp)) {
+                Text("Enable encryption", style = MaterialTheme.typography.titleLarge)
+                Spacer(modifier = Modifier.height(12.dp))
+                TextField(value = password, onValueChange = { password = it }, label = { Text("Password") })
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Checkbox(checked = encryptPath, onCheckedChange = { encryptPath = it })
+                    Text("Encrypt paths")
+                }
+                Spacer(modifier = Modifier.height(16.dp))
+                Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly) {
+                    Button(modifier = Modifier.weight(1f), onClick = onDismiss) { Text("Cancel") }
+                    Spacer(modifier = Modifier.width(12.dp))
+                    Button(
+                        modifier = Modifier.weight(1f),
+                        onClick = { onConfirmation(password, encryptPath) },
+                        enabled = password.isNotEmpty()
+                    ) { Text("Apply") }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun OpenEncryptedStorageDialog(
+    onDismiss: () -> Unit,
+    onConfirmation: (password: String, rememberPassword: Boolean) -> Unit,
+) {
+    var password by remember { mutableStateOf("") }
+    var rememberPassword by remember { mutableStateOf(false) }
+    BasicAlertDialog(onDismissRequest = onDismiss) {
+        Card {
+            Column(modifier = Modifier.padding(12.dp)) {
+                Text("Open encrypted storage", style = MaterialTheme.typography.titleLarge)
+                Spacer(modifier = Modifier.height(12.dp))
+                TextField(value = password, onValueChange = { password = it }, label = { Text("Password") })
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Checkbox(checked = rememberPassword, onCheckedChange = { rememberPassword = it })
+                    Text("Remember password")
+                }
+                Spacer(modifier = Modifier.height(16.dp))
+                Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly) {
+                    Button(modifier = Modifier.weight(1f), onClick = onDismiss) { Text("Cancel") }
+                    Spacer(modifier = Modifier.width(12.dp))
+                    Button(
+                        modifier = Modifier.weight(1f),
+                        onClick = { onConfirmation(password, rememberPassword) },
+                        enabled = password.isNotEmpty()
+                    ) { Text("Open") }
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun StorageEncryptionActionsDialog(
+    onDismiss: () -> Unit,
+    title: String,
+    isOpened: Boolean,
+    onOpen: () -> Unit,
+    onClose: () -> Unit,
+    onDisable: () -> Unit,
+) {
+    BasicAlertDialog(onDismissRequest = onDismiss) {
+        Card {
+            Column(modifier = Modifier.padding(12.dp)) {
+                Text(title, style = MaterialTheme.typography.titleLarge)
+                Spacer(modifier = Modifier.height(12.dp))
+                if (isOpened) {
+                    Button(onClick = onClose, modifier = Modifier.fillMaxWidth()) { Text("Close") }
+                } else {
+                    Button(onClick = onOpen, modifier = Modifier.fillMaxWidth()) { Text("Open") }
+                }
+                Spacer(modifier = Modifier.height(8.dp))
+                Button(onClick = onDisable, modifier = Modifier.fillMaxWidth()) { Text("Disable encryption") }
+                Spacer(modifier = Modifier.height(12.dp))
+                Button(onClick = onDismiss, modifier = Modifier.fillMaxWidth()) { Text("Done") }
+            }
+        }
+    }
+}

presentation/src/main/java/com/github/nullptroma/wallenc/presentation/elements/StorageTree.kt

@@ -18,8 +18,9 @@ import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.LockOpen
 import androidx.compose.material.icons.filled.MoreVert
-import androidx.compose.material3.Button
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.DropdownMenu
@@ -60,7 +61,12 @@ fun StorageTree(
     onClick: (Tree<IStorageInfo>) -> Unit,
     onRename: (Tree<IStorageInfo>, String) -> Unit,
     onRemove: (Tree<IStorageInfo>) -> Unit,
-    onEncrypt: (Tree<IStorageInfo>) -> Unit,
+    onEncrypt: (Tree<IStorageInfo>, String, Boolean) -> Unit,
+    onOpenEncrypted: (Tree<IStorageInfo>, String, Boolean) -> Unit,
+    onCloseEncrypted: (Tree<IStorageInfo>) -> Unit,
+    onDisableEncryption: (Tree<IStorageInfo>) -> Unit,
+    getStatusText: (Tree<IStorageInfo>) -> String,
+    isEncryptionOpened: (Tree<IStorageInfo>) -> Boolean,
 ) {
     val cur = tree.value
     val available by cur.isAvailable.collectAsStateWithLifecycle()
@@ -68,6 +74,8 @@ fun StorageTree(
     val size by cur.size.collectAsStateWithLifecycle()
     val metaInfo by cur.metaInfo.collectAsStateWithLifecycle()
     val isAvailable by cur.isAvailable.collectAsStateWithLifecycle()
+    val isEncrypted = metaInfo.encInfo != null
+    val isOpened = isEncryptionOpened(tree)
     val borderColor =
         if (cur.isVirtualStorage) MaterialTheme.colorScheme.secondary else MaterialTheme.colorScheme.primary
     Column(modifier) {
@@ -120,10 +128,13 @@ fun StorageTree(
                         modifier = Modifier,
                         horizontalAlignment = Alignment.End
                     ) {
-                        Box(modifier = Modifier.padding(0.dp, 0.dp, 0.dp, 0.dp)) {
                         var expanded by remember { mutableStateOf(false) }
                         var showRenameDialog by remember { mutableStateOf(false) }
-                            var showRemoveConfirmationDiaglog by remember { mutableStateOf(false) }
+                        var showRemoveConfirmDialog by remember { mutableStateOf(false) }
+                        var showLockDialog by remember { mutableStateOf(false) }
+                        var showSetupEncryptionDialog by remember { mutableStateOf(false) }
+                        var showOpenEncryptionDialog by remember { mutableStateOf(false) }
+                        Box(modifier = Modifier.padding(0.dp, 0.dp, 0.dp, 0.dp)) {
                             IconButton(onClick = { expanded = !expanded }) {
                                 Icon(
                                     Icons.Default.MoreVert,
@@ -145,10 +156,20 @@ fun StorageTree(
                                 DropdownMenuItem(
                                     onClick = {
                                         expanded = false
-                                        showRemoveConfirmationDiaglog = true;
+                                        showRemoveConfirmDialog = true
                                     },
                                     text = { Text(stringResource(R.string.remove)) }
                                 )
+                                if (!isEncrypted) {
+                                    HorizontalDivider()
+                                    DropdownMenuItem(
+                                        onClick = {
+                                            expanded = false
+                                            showSetupEncryptionDialog = true
+                                        },
+                                        text = { Text(stringResource(R.string.encrypt)) }
+                                    )
+                                }
                             }
 
                             if (showRenameDialog) {
@@ -163,26 +184,78 @@ fun StorageTree(
                                 )
                             }
 
-                            if (showRemoveConfirmationDiaglog) {
+                            if (showRemoveConfirmDialog) {
                                 ConfirmationCancelOkDialog(
-                                    onDismiss = {
+                                    onDismiss = { showRemoveConfirmDialog = false },
-                                        showRemoveConfirmationDiaglog = false
-                                    },
-                                    onConfirmation = {
-                                        showRemoveConfirmationDiaglog = false
-                                        onRemove(tree)
-                                    },
                                     title = stringResource(
                                         R.string.remove_confirmation_dialog,
                                         metaInfo.name ?: "<noname>"
+                                    ),
+                                    onConfirmation = {
+                                        showRemoveConfirmDialog = false
+                                        onRemove(tree)
+                                    }
                                 )
+                            }
+
+                            if (showLockDialog) {
+                                StorageEncryptionActionsDialog(
+                                    onDismiss = { showLockDialog = false },
+                                    title = metaInfo.name ?: stringResource(R.string.no_name),
+                                    isOpened = isOpened,
+                                    onOpen = {
+                                        showLockDialog = false
+                                        showOpenEncryptionDialog = true
+                                    },
+                                    onClose = {
+                                        showLockDialog = false
+                                        onCloseEncrypted(tree)
+                                    },
+                                    onDisable = {
+                                        showLockDialog = false
+                                        onDisableEncryption(tree)
+                                    }
+                                )
+                            }
+
+                            if (showSetupEncryptionDialog) {
+                                EncryptionSetupDialog(
+                                    onDismiss = { showSetupEncryptionDialog = false },
+                                    onConfirmation = { password, encryptPath ->
+                                        showSetupEncryptionDialog = false
+                                        onEncrypt(tree, password, encryptPath)
+                                    }
+                                )
+                            }
+
+                            if (showOpenEncryptionDialog) {
+                                OpenEncryptedStorageDialog(
+                                    onDismiss = { showOpenEncryptionDialog = false },
+                                    onConfirmation = { password, rememberPassword ->
+                                        showOpenEncryptionDialog = false
+                                        onOpenEncrypted(tree, password, rememberPassword)
+                                    }
                                 )
                             }
                         }
                         Spacer(modifier = Modifier.weight(1f))
-                        Button(onClick = { onEncrypt(tree) }, enabled = metaInfo.encInfo == null) {
+                        if (isEncrypted) {
-                            Text("Encrypt")
+                            IconButton(onClick = { showLockDialog = true }) {
+                                Icon(
+                                    if (isOpened) Icons.Default.LockOpen else Icons.Default.Lock,
+                                    contentDescription = stringResource(R.string.storage_lock_actions)
+                                )
                             }
+                        }
+                        Text(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(0.dp, 0.dp, 12.dp, 0.dp)
+                                .align(Alignment.End),
+                            text = getStatusText(tree),
+                            textAlign = TextAlign.End,
+                            fontSize = 11.sp,
+                        )
                         Text(
                             modifier = Modifier
                                 .fillMaxWidth()
@@ -221,7 +294,12 @@ fun StorageTree(
                 onClick,
                 onRename,
                 onRemove,
-                onEncrypt
+                onEncrypt,
+                onOpenEncrypted,
+                onCloseEncrypted,
+                onDisableEncryption,
+                getStatusText,
+                isEncryptionOpened
             )
         }
     }

presentation/src/main/java/com/github/nullptroma/wallenc/presentation/screens/main/screens/local/vault/LocalVaultScreen.kt

@@ -1,9 +1,7 @@
 package com.github.nullptroma.wallenc.presentation.screens.main.screens.local.vault
 
-import android.widget.ProgressBar
+import android.widget.Toast
 import androidx.compose.foundation.background
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.gestures.detectTapGestures
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.WindowInsets
@@ -23,16 +21,18 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.github.nullptroma.wallenc.presentation.elements.StorageTree
 import com.github.nullptroma.wallenc.presentation.extensions.gesturesDisabled
+import kotlinx.coroutines.flow.collect
 
 @Composable
 fun LocalVaultScreen(
@@ -42,6 +42,13 @@ fun LocalVaultScreen(
 ) {
 
     val uiState by viewModel.state.collectAsStateWithLifecycle()
+    val context = LocalContext.current
+    LaunchedEffect(Unit) {
+        viewModel.messages.collect { message ->
+            Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+        }
+    }
+
     Box {
         Scaffold(modifier = modifier, contentWindowInsets = WindowInsets(0.dp), floatingActionButton = {
             FloatingActionButton(
@@ -66,9 +73,24 @@ fun LocalVaultScreen(
                         onRemove = { tree ->
                             viewModel.remove(tree.value)
                         },
-                        onEncrypt = { tree ->
+                        onEncrypt = { tree, password, encryptPath ->
-                            viewModel.enableEncryptionAndOpenStorage(tree.value)
+                            viewModel.enableEncryption(tree.value, password, encryptPath)
-                        }
+                        },
+                        onOpenEncrypted = { tree, password, remember ->
+                            viewModel.openEncryptedStorage(tree.value, password, remember)
+                        },
+                        onCloseEncrypted = { tree ->
+                            viewModel.closeEncryptedStorage(tree.value)
+                        },
+                        onDisableEncryption = { tree ->
+                            viewModel.disableEncryption(tree.value)
+                        },
+                        getStatusText = { tree ->
+                            viewModel.getStorageStatus(tree.value)
+                        },
+                        isEncryptionOpened = { tree ->
+                            viewModel.isEncryptionSessionOpen(tree.value)
+                        },
                     )
                 }
                 item {

presentation/src/main/java/com/github/nullptroma/wallenc/presentation/screens/main/screens/local/vault/LocalVaultViewModel.kt

@@ -7,7 +7,6 @@ import com.github.nullptroma.wallenc.domain.interfaces.IDirectory
 import com.github.nullptroma.wallenc.domain.interfaces.IFile
 import com.github.nullptroma.wallenc.domain.interfaces.ILogger
 import com.github.nullptroma.wallenc.domain.interfaces.IStorageInfo
-import com.github.nullptroma.wallenc.domain.enums.StorageDeletionPolicy
 import com.github.nullptroma.wallenc.domain.usecases.GetOpenedStoragesUseCase
 import com.github.nullptroma.wallenc.domain.usecases.ManageLocalVaultUseCase
 import com.github.nullptroma.wallenc.domain.usecases.ManageStoragesEncryptionUseCase
@@ -19,6 +18,8 @@ import com.github.nullptroma.wallenc.presentation.extensions.toPrintable
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 import kotlin.system.measureTimeMillis
@@ -33,6 +34,9 @@ class LocalVaultViewModel @Inject constructor(
     private val renameStorageUseCase: RenameStorageUseCase,
     private val logger: ILogger
 ) : ViewModelBase<LocalVaultScreenState>(LocalVaultScreenState(listOf(), true)) {
+    private val _messages = MutableSharedFlow<String>()
+    val messages: SharedFlow<String> = _messages
+
     private var _taskCount: Int = 0
     private var tasksCount
         get() = _taskCount
@@ -114,37 +118,105 @@ class LocalVaultViewModel @Inject constructor(
         }
     }
 
-    private val runningStorages = mutableSetOf<IStorageInfo>()
+    private val runningStorages = mutableSetOf<java.util.UUID>()
-    fun enableEncryptionAndOpenStorage(storage: IStorageInfo) {
+    fun enableEncryption(storage: IStorageInfo, password: String, encryptPath: Boolean) {
-        if(runningStorages.contains(storage))
+        val id = storage.uuid
+        if (runningStorages.contains(id))
             return
         tasksCount++
-        runningStorages.add(storage)
+        runningStorages.add(id)
-        val key = EncryptKey("Hello")
+        val key = EncryptKey(password)
         viewModelScope.launch {
             try {
-                manageStoragesEncryptionUseCase.enableEncryption(storage, key, false)
+                when (manageStoragesEncryptionUseCase.canEncrypt(storage)) {
-                manageStoragesEncryptionUseCase.openStorage(storage, key)
+                    ManageStoragesEncryptionUseCase.CanEncryptResult.Allowed -> {
+                        manageStoragesEncryptionUseCase.enableEncryption(storage, key, encryptPath)
+                        manageStoragesEncryptionUseCase.openStorage(storage, key, true)
+                        _messages.emit("Encryption enabled")
+                    }
+                    ManageStoragesEncryptionUseCase.CanEncryptResult.AlreadyEncrypted -> {
+                        _messages.emit("Storage is already encrypted")
+                    }
+                    ManageStoragesEncryptionUseCase.CanEncryptResult.StorageIsNotEmpty -> {
+                        _messages.emit("Storage is not empty")
+                    }
+                    ManageStoragesEncryptionUseCase.CanEncryptResult.StorageStateUnknown -> {
+                        _messages.emit("Cannot determine whether storage is empty")
+                    }
+                    ManageStoragesEncryptionUseCase.CanEncryptResult.UnsupportedStorageType -> {
+                        _messages.emit("Unsupported storage type")
+                    }
+                }
+            } catch (e: Exception) {
+                _messages.emit(e.message ?: "Failed to enable encryption")
             }
             finally {
-                runningStorages.remove(storage)
+                runningStorages.remove(id)
                 tasksCount--
             }
         }
     }
 
+    fun openEncryptedStorage(storage: IStorageInfo, password: String, rememberPassword: Boolean) {
+        val id = storage.uuid
+        if (runningStorages.contains(id)) return
+        tasksCount++
+        runningStorages.add(id)
+        val key = EncryptKey(password)
+        viewModelScope.launch {
+            try {
+                manageStoragesEncryptionUseCase.openStorage(storage, key, rememberPassword)
+            } catch (e: Exception) {
+                _messages.emit(e.message ?: "Failed to open encrypted storage")
+            } finally {
+                runningStorages.remove(id)
+                tasksCount--
+            }
+        }
+    }
+
+    fun closeEncryptedStorage(storage: IStorageInfo) {
+        viewModelScope.launch {
+            try {
+                manageStoragesEncryptionUseCase.closeStorage(storage)
+            } catch (e: Exception) {
+                _messages.emit(e.message ?: "Failed to close encrypted storage")
+            }
+        }
+    }
+
+    fun disableEncryption(storage: IStorageInfo) {
+        viewModelScope.launch {
+            try {
+                manageStoragesEncryptionUseCase.disableEncryption(storage)
+                _messages.emit("Encryption disabled")
+            } catch (e: Exception) {
+                _messages.emit(e.message ?: "Failed to disable encryption")
+            }
+        }
+    }
+
     fun rename(storage: IStorageInfo, newName: String) {
         viewModelScope.launch {
             renameStorageUseCase.rename(storage, newName)
         }
     }
 
-    fun remove(
+    fun remove(storage: IStorageInfo) {
-        storage: IStorageInfo,
-        policy: StorageDeletionPolicy = StorageDeletionPolicy.REMOVE_PHYSICAL,
-    ) {
         viewModelScope.launch {
-            removeStorageUseCase.remove(storage, policy)
+            removeStorageUseCase.remove(storage)
         }
     }
+
+    fun getStorageStatus(storage: IStorageInfo): String {
+        val encrypted = storage.metaInfo.value.encInfo != null
+        if (!encrypted) return "Not encrypted"
+        val opened = isEncryptionSessionOpen(storage)
+        return if (opened) "Encrypted (opened)" else "Encrypted (closed)"
+    }
+
+    fun isEncryptionSessionOpen(storage: IStorageInfo): Boolean {
+        val openedMap = getOpenedStoragesUseCase.openedStorages.value
+        return openedMap.containsKey(storage.uuid)
+    }
 }

presentation/src/main/res/values/strings.xml

@@ -10,7 +10,9 @@
     <string name="show_storage_item_menu">Show storage item menu</string>
     <string name="rename">Rename</string>
     <string name="remove">Remove</string>
+    <string name="encrypt">Encrypt</string>
     <string name="new_name_title">New name</string>
     <string name="remove_confirmation_dialog">Delete storage "%1$s"?</string>
+    <string name="storage_lock_actions">Storage encryption actions</string>
 
 </resources>