Secret editing + backup finished + Compose previews + lots of improvements

Signed-off-by: Iván Ávalos <avalos@disroot.org>

18 files changed, 748 insertions, 52 deletions

diff --git a/anastasis/build.gradle.kts b/anastasis/build.gradle.kts
index eedf4f2..52a9ec5 100644
--- a/anastasis/build.gradle.kts
+++ b/anastasis/build.gradle.kts
@@ -27,7 +27,7 @@ android {
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
         }
     }
diff --git a/anastasis/src/main/java/net/taler/anastasis/MainActivity.kt b/anastasis/src/main/java/net/taler/anastasis/MainActivity.kt
index 653d8a5..80b74bf 100644
--- a/anastasis/src/main/java/net/taler/anastasis/MainActivity.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/MainActivity.kt
@@ -15,6 +15,8 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
 import androidx.hilt.navigation.compose.hiltViewModel
 import dagger.hilt.android.AndroidEntryPoint
+import net.taler.anastasis.ui.backup.BackupFinishedScreen
+import net.taler.anastasis.ui.backup.EditSecretScreen
 import net.taler.anastasis.ui.backup.ReviewPoliciesScreen
 import net.taler.anastasis.ui.backup.SelectAuthMethodsScreen
 import net.taler.anastasis.ui.common.SelectContinentScreen
@@ -79,9 +81,15 @@ fun MainNavHost(
         Routes.SelectAuthMethods.route -> {
             SelectAuthMethodsScreen()
         }
-        Routes.ReviewPoliciesScreen.route -> {
+        Routes.ReviewPolicies.route -> {
             ReviewPoliciesScreen()
         }
+        Routes.EditSecret.route -> {
+            EditSecretScreen()
+        }
+        Routes.BackupFinished.route -> {
+            BackupFinishedScreen()
+        }
         Routes.RestoreInit.route -> {
             Text("This is the restore session screen!")
         }
diff --git a/anastasis/src/main/java/net/taler/anastasis/Routes.kt b/anastasis/src/main/java/net/taler/anastasis/Routes.kt
index 5258e7f..e3242af 100644
--- a/anastasis/src/main/java/net/taler/anastasis/Routes.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/Routes.kt
@@ -13,7 +13,9 @@ sealed class Routes(
 
     // Backup
     object SelectAuthMethods: Routes("select_auth_methods")
-    object ReviewPoliciesScreen: Routes("review_policies")
+    object ReviewPolicies: Routes("review_policies")
+    object EditSecret: Routes("edit_secret")
+    object BackupFinished: Routes("backup_finished")
 
     // Restore
     object RestoreInit: Routes("restore")
diff --git a/anastasis/src/main/java/net/taler/anastasis/reducers/ReducerManager.kt b/anastasis/src/main/java/net/taler/anastasis/reducers/ReducerManager.kt
index a074044..b3483d5 100644
--- a/anastasis/src/main/java/net/taler/anastasis/reducers/ReducerManager.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/reducers/ReducerManager.kt
@@ -218,7 +218,7 @@ class ReducerManager(
                         this@ReducerManager.next()
                     }.onError { onError(it) }
                 }
-            }
+            }.onError { onError(it) }
         }
     }
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/backup/BackupFinishedScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/backup/BackupFinishedScreen.kt
new file mode 100644
index 0000000..fc89caa
--- /dev/null
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/backup/BackupFinishedScreen.kt
@@ -0,0 +1,196 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2023 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.anastasis.ui.backup
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.Icon
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CloudDone
+import androidx.compose.material3.ElevatedCard
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.hilt.navigation.compose.hiltViewModel
+import kotlinx.datetime.Instant
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+import net.taler.anastasis.R
+import net.taler.anastasis.models.AuthenticationProviderStatus
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.ReducerState
+import net.taler.anastasis.models.SuccessDetail
+import net.taler.anastasis.shared.Utils
+import net.taler.anastasis.ui.reusable.pages.WizardPage
+import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
+import net.taler.common.Timestamp
+
+@Composable
+fun BackupFinishedScreen(
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
+) {
+    val state by viewModel.reducerState.collectAsState()
+    val reducerState = state as? ReducerState.Backup
+        ?: error("invalid reducer state type")
+
+    // Get only providers with "ok" status
+    val providers = remember(reducerState.authenticationProviders) {
+        reducerState.authenticationProviders?.filter {
+            it.value is AuthenticationProviderStatus.Ok
+        }?.mapValues { it.value as AuthenticationProviderStatus.Ok } ?: emptyMap()
+    }
+
+    val details = reducerState.successDetails ?: emptyMap()
+
+    WizardPage(
+        title = stringResource(R.string.backup_finished_title),
+        onBackClicked = { viewModel.goHome() },
+        showNext = false,
+        showPrev = false,
+    ) {
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .nestedScroll(it),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            item {
+                Box(
+                    modifier = Modifier
+                        .padding(LocalSpacing.current.large)
+                        .background(MaterialTheme.colorScheme.primary, shape = CircleShape)
+                        .fillMaxWidth(0.4f)
+                        .aspectRatio(1f),
+                    contentAlignment = Alignment.Center,
+                ) {
+                    Icon(
+                        Icons.Default.CloudDone,
+                        modifier = Modifier.fillMaxSize(0.5f),
+                        tint = MaterialTheme.colorScheme.onPrimary,
+                        contentDescription = stringResource(R.string.success),
+                    )
+                }
+            }
+            item {
+                Text(
+                    stringResource(R.string.backup_stored_providers),
+                    modifier = Modifier.padding(LocalSpacing.current.medium),
+                    style = MaterialTheme.typography.titleLarge,
+                )
+            }
+            items(items = details.keys.toList()) { url ->
+                val provider = providers[url] ?: return@items
+                val detail = details[url] ?: return@items
+                ProviderCard(
+                    modifier = Modifier
+                        .padding(
+                            start = LocalSpacing.current.medium,
+                            end = LocalSpacing.current.medium,
+                            bottom = LocalSpacing.current.small,
+                        )
+                        .fillMaxWidth(),
+                    provider = provider,
+                    detail = detail,
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun ProviderCard(
+    modifier: Modifier,
+    provider: AuthenticationProviderStatus.Ok,
+    detail: SuccessDetail,
+) {
+    ElevatedCard(
+        modifier = modifier,
+    ) {
+        Column(
+            modifier = Modifier.padding(LocalSpacing.current.medium)
+        ) {
+            val date = Utils.formatDate(
+                Instant
+                    .fromEpochMilliseconds(detail.policyExpiration.ms)
+                    .toLocalDateTime(TimeZone.currentSystemDefault())
+                    .date,
+            )
+            Text(
+                provider.businessName,
+                modifier = Modifier.padding(bottom = LocalSpacing.current.small),
+                style = MaterialTheme.typography.titleMedium,
+            )
+            Text(
+                stringResource(
+                    R.string.backup_policy_detail,
+                    detail.policyVersion,
+                    date,
+                )
+            )
+        }
+    }
+}
+
+@Preview
+@Composable
+fun BackupFinishedScreenPreview() {
+    BackupFinishedScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.BackupFinished,
+                authenticationProviders = mapOf(
+                    "https://localhost:8088/" to AuthenticationProviderStatus.Ok(
+                        httpStatus = 200,
+                        methods = listOf(),
+                        annualFee = "EUR:0.99",
+                        truthUploadFee = "EUR:3.99",
+                        liabilityLimit = "EUR:1",
+                        currency = "EUR",
+                        storageLimitInMegabytes = 1,
+                        businessName = "Anastasis 42",
+                        providerSalt = "BXAPCKSH9D3MYJTS9536RHJHCX",
+                    )
+                ),
+                successDetails = mapOf(
+                    "https://localhost:8088/" to SuccessDetail(
+                        policyVersion = 1,
+                        policyExpiration = Timestamp.now(),
+                    ),
+                ),
+            ),
+        ),
+    )
+}
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/backup/EditSecretScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/backup/EditSecretScreen.kt
new file mode 100644
index 0000000..9706ceb
--- /dev/null
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/backup/EditSecretScreen.kt
@@ -0,0 +1,110 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2023 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.anastasis.ui.backup
+
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.hilt.navigation.compose.hiltViewModel
+import net.taler.anastasis.R
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.CoreSecret
+import net.taler.anastasis.models.ReducerArgs
+import net.taler.anastasis.models.ReducerState
+import net.taler.anastasis.ui.forms.EditSecretForm
+import net.taler.anastasis.ui.reusable.pages.WizardPage
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
+import net.taler.common.Amount
+import net.taler.common.CryptoUtils
+import net.taler.common.Timestamp
+
+@Composable
+fun EditSecretScreen(
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
+) {
+    val state by viewModel.reducerState.collectAsState()
+    val reducerState = state as? ReducerState.Backup
+        ?: error("invalid reducer state type")
+
+    var secretName by remember {
+        mutableStateOf(reducerState.secretName ?: "")
+    }
+    var secretValue by remember {
+        mutableStateOf(reducerState.coreSecret?.value?.let {
+            CryptoUtils.decodeCrock(it).toString(Charsets.UTF_8)
+        } ?: "")
+    }
+
+    WizardPage(
+        title = stringResource(R.string.edit_secret_title),
+        onBackClicked = { viewModel.goHome() },
+        onPrevClicked = { viewModel.goBack() },
+        onNextClicked = {
+            viewModel.reducerManager?.backupSecret(
+                name = secretName,
+                args = ReducerArgs.EnterSecret(
+                    secret = ReducerArgs.EnterSecret.Secret(
+                        value = CryptoUtils.encodeCrock(secretValue.toByteArray(Charsets.UTF_8)),
+                        mime = "text/plain",
+                    ),
+                    expiration = null,
+                )
+            )
+        },
+    ) {
+        EditSecretForm(
+            modifier = Modifier.fillMaxSize(),
+            name = secretName,
+            value = secretValue,
+        ) { name, value, _ ->
+            secretName = name
+            secretValue = value
+        }
+    }
+}
+
+@Preview
+@Composable
+fun EditSecretScreenPreview() {
+    EditSecretScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.SecretEditing,
+                secretName = "_TALERWALLET_MyPinePhone",
+                coreSecret = CoreSecret(
+                    value = "EDJP6WK5EG50",
+                    mime = "text/plain",
+                ),
+                expiration = Timestamp.never(),
+                uploadFees = listOf(
+                    ReducerState.Backup.UploadFee(
+                        fee = Amount("KUDOS", 42L, 0),
+                    ),
+                ),
+            ),
+        ),
+    )
+}
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/backup/ReviewPoliciesScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/backup/ReviewPoliciesScreen.kt
index c42e7bc..edd6ddb 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/backup/ReviewPoliciesScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/backup/ReviewPoliciesScreen.kt
@@ -49,22 +49,27 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.hilt.navigation.compose.hiltViewModel
 import net.taler.anastasis.R
 import net.taler.anastasis.models.AuthMethod
 import net.taler.anastasis.models.AuthenticationProviderStatus
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.MethodSpec
 import net.taler.anastasis.models.Policy
 import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.ui.dialogs.EditPolicyDialog
 import net.taler.anastasis.ui.forms.EditPolicyForm
 import net.taler.anastasis.ui.reusable.pages.WizardPage
 import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
 import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ReviewPoliciesScreen(
-    viewModel: ReducerViewModel = hiltViewModel(),
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
 ) {
     val state by viewModel.reducerState.collectAsState()
     val reducerState = state as? ReducerState.Backup
@@ -97,9 +102,9 @@ fun ReviewPoliciesScreen(
             onCancel = { reset() },
             onPolicyEdited = {
                 editingPolicyIndex?.let { index ->
-                    viewModel.reducerManager.updatePolicy(index, it)
+                    viewModel.reducerManager?.updatePolicy(index, it)
                 } ?: run {
-                    viewModel.reducerManager.addPolicy(it)
+                    viewModel.reducerManager?.addPolicy(it)
                 }
                 reset()
             }
@@ -111,7 +116,7 @@ fun ReviewPoliciesScreen(
         onBackClicked = { viewModel.goHome() },
         onPrevClicked = { viewModel.goBack() },
         onNextClicked = {
-            viewModel.reducerManager.next()
+            viewModel.reducerManager?.next()
         }
     ) {
         Scaffold(
@@ -143,10 +148,10 @@ fun ReviewPoliciesScreen(
                         providers = providers,
                         index = index,
                         onEdit = {
-                            viewModel.reducerManager.updatePolicy(index, it)
+                            viewModel.reducerManager?.updatePolicy(index, it)
                         },
                     ) {
-                        viewModel.reducerManager.deletePolicy(index)
+                        viewModel.reducerManager?.deletePolicy(index)
                     }
                 }
             }
@@ -249,11 +254,84 @@ fun PolicyMethodCard(
                     style = MaterialTheme.typography.labelMedium,
                     fontWeight = FontWeight.Bold,
                 )
-//                Text(
-//                    provider.businessName,
-//                    style = MaterialTheme.typography.labelMedium,
-//                )
             }
         }
     }
+}
+
+@Preview
+@Composable
+fun ReviewPoliciesScreenPreview() {
+    ReviewPoliciesScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.PoliciesReviewing,
+                authenticationMethods = listOf(
+                    AuthMethod(
+                        type = AuthMethod.Type.Question,
+                        mimeType = "text/plain",
+                        challenge = "E1QPPS8A",
+                        instructions = "What is your favorite GNU package?",
+                    ),
+                    AuthMethod(
+                        type = AuthMethod.Type.Email,
+                        instructions = "E-mail to user@*le.com",
+                        challenge = "ENSPAWJ0CNW62VBGDHJJWRVFDM50",
+                    )
+                ),
+                authenticationProviders = mapOf(
+                    "http://localhost:8088/" to AuthenticationProviderStatus.Ok(
+                        httpStatus = 200,
+                        methods = listOf(
+                            MethodSpec(type = AuthMethod.Type.Question, usageFee = "EUR:0.001"),
+                            MethodSpec(type = AuthMethod.Type.Sms, usageFee = "EUR:0.55"),
+                        ),
+                        annualFee = "EUR:0.99",
+                        truthUploadFee = "EUR:3.99",
+                        liabilityLimit = "EUR:1",
+                        currency = "EUR",
+                        storageLimitInMegabytes = 1,
+                        businessName = "Anastasis 4",
+                        providerSalt = "CXAPCKSH9D3MYJTS9536RHJHCW",
+                    ),
+                    "http://localhost:8089/" to AuthenticationProviderStatus.Ok(
+                        httpStatus = 200,
+                        methods = listOf(
+                            MethodSpec(type = AuthMethod.Type.Question, usageFee = "EUR:0.001"),
+                            MethodSpec(type = AuthMethod.Type.Sms, usageFee = "EUR:0.55"),
+                        ),
+                        annualFee = "EUR:0.99",
+                        truthUploadFee = "EUR:3.99",
+                        liabilityLimit = "EUR:1",
+                        currency = "EUR",
+                        storageLimitInMegabytes = 1,
+                        businessName = "Anastasis 2",
+                        providerSalt = "CXAPCKSH9D3MYJTS9536RHJHCW",
+                    ),
+                ),
+                policies = listOf(
+                    Policy(
+                        methods = listOf(
+                            Policy.PolicyMethod(
+                                authenticationMethod = 0,
+                                provider = "http://localhost:8089/",
+                            ),
+                            Policy.PolicyMethod(
+                                authenticationMethod = 1,
+                                provider = "http://localhost:8088/",
+                            ),
+                        ),
+                    ),
+                    Policy(
+                        methods = listOf(
+                            Policy.PolicyMethod(
+                                authenticationMethod = 0,
+                                provider = "http://localhost:8089/",
+                            ),
+                        ),
+                    ),
+                ),
+            ),
+        ),
+    )
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/backup/SelectAuthMethodsScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/backup/SelectAuthMethodsScreen.kt
index 1ffd9ac..7cbea00 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/backup/SelectAuthMethodsScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/backup/SelectAuthMethodsScreen.kt
@@ -45,23 +45,28 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
 import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import net.taler.anastasis.R
 import net.taler.anastasis.shared.Utils
 import net.taler.anastasis.models.AuthMethod
 import net.taler.anastasis.models.AuthenticationProviderStatus
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.MethodSpec
 import net.taler.anastasis.models.ReducerArgs
 import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.ui.dialogs.EditMethodDialog
 import net.taler.anastasis.ui.reusable.components.ActionCard
 import net.taler.anastasis.ui.reusable.pages.WizardPage
 import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
 import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
 
 @Composable
 fun SelectAuthMethodsScreen(
-    viewModel: ReducerViewModel = hiltViewModel(),
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
 ) {
     val state by viewModel.reducerState.collectAsState()
     val reducerState = state as? ReducerState.Backup
@@ -99,7 +104,7 @@ fun SelectAuthMethodsScreen(
             onMethodEdited = {
                 reset()
                 Log.d("onMethodEdited", it.challenge)
-                viewModel.reducerManager.addAuthentication(
+                viewModel.reducerManager?.addAuthentication(
                     ReducerArgs.AddAuthentication(it)
                 )
             }
@@ -111,7 +116,7 @@ fun SelectAuthMethodsScreen(
         onBackClicked = { viewModel.goHome() },
         onPrevClicked = { viewModel.goBack() },
         onNextClicked = {
-            viewModel.reducerManager.next()
+            viewModel.reducerManager?.next()
         }
     ) { scroll ->
         AuthMethods(
@@ -123,7 +128,7 @@ fun SelectAuthMethodsScreen(
                 showEditDialog = true
             },
             onDeleteMethod = {
-                viewModel.reducerManager.deleteAuthentication(it)
+                viewModel.reducerManager?.deleteAuthentication(it)
             },
         )
     }
@@ -230,4 +235,60 @@ private fun ChallengeCard(
             }
         }
     }
+}
+
+@Preview
+@Composable
+fun SelectAuthMethodsScreenPreview() {
+    SelectAuthMethodsScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.AuthenticationsEditing,
+                authenticationMethods = listOf(
+                    AuthMethod(
+                        type = AuthMethod.Type.Question,
+                        mimeType = "text/plain",
+                        challenge = "E1QPPS8A",
+                        instructions = "What is your favorite GNU package?",
+                    ),
+                    AuthMethod(
+                        type = AuthMethod.Type.Email,
+                        instructions = "E-mail to user@*le.com",
+                        challenge = "ENSPAWJ0CNW62VBGDHJJWRVFDM50",
+                    )
+                ),
+                authenticationProviders = mapOf(
+                    "http://localhost:8088/" to AuthenticationProviderStatus.Ok(
+                        httpStatus = 200,
+                        methods = listOf(
+                            MethodSpec(type = AuthMethod.Type.Question, usageFee = "EUR:0.001"),
+                            MethodSpec(type = AuthMethod.Type.Sms, usageFee = "EUR:0.55"),
+                        ),
+                        annualFee = "EUR:0.99",
+                        truthUploadFee = "EUR:3.99",
+                        liabilityLimit = "EUR:1",
+                        currency = "EUR",
+                        storageLimitInMegabytes = 1,
+                        businessName = "Anastasis 4",
+                        providerSalt = "CXAPCKSH9D3MYJTS9536RHJHCW",
+                    ),
+                    "http://localhost:8089/" to AuthenticationProviderStatus.Ok(
+                        httpStatus = 200,
+                        methods = listOf(
+                            MethodSpec(type = AuthMethod.Type.Question, usageFee = "EUR:0.001"),
+                            MethodSpec(type = AuthMethod.Type.Sms, usageFee = "EUR:0.55"),
+                        ),
+                        annualFee = "EUR:0.99",
+                        truthUploadFee = "EUR:3.99",
+                        liabilityLimit = "EUR:1",
+                        currency = "EUR",
+                        storageLimitInMegabytes = 1,
+                        businessName = "Anastasis 2",
+                        providerSalt = "CXAPCKSH9D3MYJTS9536RHJHCW",
+                    ),
+                ),
+
+            )
+        )
+    )
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectContinentScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectContinentScreen.kt
index eacbea4..10a8978 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectContinentScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectContinentScreen.kt
@@ -28,17 +28,22 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.hilt.navigation.compose.hiltViewModel
 import net.taler.anastasis.R
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.ContinentInfo
 import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.ui.reusable.components.Picker
 import net.taler.anastasis.ui.reusable.pages.WizardPage
 import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
 import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
 
 @Composable
 fun SelectContinentScreen(
-    viewModel: ReducerViewModel = hiltViewModel(),
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
 ) {
     val reducerState by viewModel.reducerState.collectAsState()
     val continents = when (val state = reducerState) {
@@ -66,7 +71,7 @@ fun SelectContinentScreen(
         onBackClicked = { viewModel.goHome() },
         onNextClicked = {
             localContinent?.let {
-                viewModel.reducerManager.selectContinent(it)
+                viewModel.reducerManager?.selectContinent(it)
             }
         },
     ) {
@@ -88,4 +93,21 @@ fun SelectContinentScreen(
             )
         }
     }
+}
+
+@Preview
+@Composable
+fun SelectContinentScreenPreview() {
+    SelectContinentScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.ContinentSelecting,
+                selectedContinent = "Europe",
+                continents = listOf(
+                    ContinentInfo(name = "Europe"),
+                    ContinentInfo(name = "North America"),
+                )
+            )
+        )
+    )
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectCountryScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectCountryScreen.kt
index 4c8a32e..f137e5e 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectCountryScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectCountryScreen.kt
@@ -28,17 +28,22 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.hilt.navigation.compose.hiltViewModel
 import net.taler.anastasis.R
+import net.taler.anastasis.models.BackupStates
+import net.taler.anastasis.models.CountryInfo
 import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.ui.reusable.components.Picker
 import net.taler.anastasis.ui.reusable.pages.WizardPage
 import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
 import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
 
 @Composable
 fun SelectCountryScreen(
-    viewModel: ReducerViewModel = hiltViewModel(),
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
 ) {
     val reducerState by viewModel.reducerState.collectAsState()
     val countries = when (val state = reducerState) {
@@ -66,7 +71,7 @@ fun SelectCountryScreen(
         onPrevClicked = { viewModel.goBack() },
         onNextClicked = {
             localCountry?.let {
-                viewModel.reducerManager.selectCountry(it)
+                viewModel.reducerManager?.selectCountry(it)
             }
         },
     ) {
@@ -88,4 +93,29 @@ fun SelectCountryScreen(
             )
         }
     }
+}
+
+@Preview
+@Composable
+fun SelectCountryScreenPreview() {
+    SelectCountryScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.ContinentSelecting,
+                selectedCountry = "ch",
+                countries = listOf(
+                    CountryInfo(
+                        code = "ch",
+                        name = "Switzerland",
+                        continent = "Europe",
+                    ),
+                    CountryInfo(
+                        code = "de",
+                        name = "Germany",
+                        continent = "Europe",
+                    )
+                )
+            )
+        )
+    )
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectUserAttributesScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectUserAttributesScreen.kt
index 9374798..6c09ae5 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectUserAttributesScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/common/SelectUserAttributesScreen.kt
@@ -24,6 +24,8 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
@@ -34,23 +36,29 @@ import androidx.compose.runtime.mutableStateMapOf
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.tooling.preview.Preview
 import androidx.hilt.navigation.compose.hiltViewModel
 import kotlinx.datetime.toLocalDate
 import net.taler.anastasis.R
-import net.taler.anastasis.shared.Utils
+import net.taler.anastasis.models.BackupStates
 import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.models.UserAttributeSpec
 import net.taler.anastasis.shared.FieldStatus
+import net.taler.anastasis.shared.Utils
 import net.taler.anastasis.ui.reusable.components.DatePickerField
 import net.taler.anastasis.ui.reusable.pages.WizardPage
 import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.anastasis.viewmodels.FakeReducerViewModel
 import net.taler.anastasis.viewmodels.ReducerViewModel
+import net.taler.anastasis.viewmodels.ReducerViewModelI
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun SelectUserAttributesScreen(
-    viewModel: ReducerViewModel = hiltViewModel(),
+    viewModel: ReducerViewModelI = hiltViewModel<ReducerViewModel>(),
 ) {
     val reducerState by viewModel.reducerState.collectAsState()
     val userAttributes = when (val state = reducerState) {
@@ -69,18 +77,18 @@ fun SelectUserAttributesScreen(
         *identityAttributes.toList().toTypedArray()
     ) }
 
-    val enableNext = remember(userAttributes, values) {
-        userAttributes.fold(true) { a, b ->
-            a && (fieldStatus(b, values[b.name]) == FieldStatus.Valid)
-        }
+    val enableNext = userAttributes.fold(true) { a, b ->
+        a && (fieldStatus(b, values[b.name]) == FieldStatus.Valid)
     }
 
+    val focusManager = LocalFocusManager.current
+
     WizardPage(
         title = stringResource(R.string.select_user_attributes_title),
         onBackClicked = { viewModel.goHome() },
         onPrevClicked = { viewModel.goBack() },
         onNextClicked = {
-            viewModel.reducerManager.enterUserAttributes(values)
+            viewModel.reducerManager?.enterUserAttributes(values)
         },
         enableNext = enableNext,
     ) { scrollConnection ->
@@ -91,9 +99,7 @@ fun SelectUserAttributesScreen(
             verticalArrangement = Arrangement.Top,
         ) {
             items(items = userAttributes) { attr ->
-                val status = remember(attr, values) {
-                    fieldStatus(attr, values[attr.name])
-                }
+                val status = fieldStatus(attr, values[attr.name])
                 val supportingRes = remember(attr, status) {
                     status.msgRes ?: if (attr.optional == true) {
                         R.string.field_optional
@@ -108,6 +114,8 @@ fun SelectUserAttributesScreen(
                             )
                             .fillMaxWidth(),
                         value = values[attr.name] ?: "",
+                        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
+                        keyboardActions = KeyboardActions(onDone = { focusManager.clearFocus() }),
                         onValueChange = { values[attr.name] = it },
                         isError = status.error,
                         supportingText = {
@@ -152,4 +160,36 @@ private fun fieldStatus(
         } ?: FieldStatus.Valid
     } else if (field.optional == true)
         FieldStatus.Valid else FieldStatus.Blank
+}
+
+@Preview
+@Composable
+fun SelectUserAttributesScreenPreview() {
+    SelectUserAttributesScreen(
+        viewModel = FakeReducerViewModel(
+            state = ReducerState.Backup(
+                backupState = BackupStates.UserAttributesCollecting,
+                identityAttributes = mapOf(
+                    "full_name" to "Max Musterman",
+                    "birthdate" to "2000-01-01",
+                ),
+                requiredAttributes = listOf(
+                    UserAttributeSpec(
+                        type = "string",
+                        name = "full_name",
+                        label = "Full name",
+                        widget = "anastasis_gtk_ia_full_name",
+                        uuid = "9e8f463f-575f-42cb-85f3-759559997331",
+                    ),
+                    UserAttributeSpec(
+                        type = "date",
+                        name = "birthdate",
+                        label = "Birthdate",
+                        widget = "anastasis_gtk_ia_birthdate",
+                        uuid = "83d655c7-bdb6-484d-904e-80c1058c8854",
+                    ),
+                ),
+            ),
+        ),
+    )
 }
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/dialogs/EditMethodDialog.kt b/anastasis/src/main/java/net/taler/anastasis/ui/dialogs/EditMethodDialog.kt
index a7c3f62..6437e5a 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/dialogs/EditMethodDialog.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/dialogs/EditMethodDialog.kt
@@ -26,11 +26,11 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.res.stringResource
 import net.taler.anastasis.R
-import net.taler.anastasis.shared.Utils
 import net.taler.anastasis.models.AuthMethod
 import net.taler.anastasis.ui.forms.EditEmailForm
 import net.taler.anastasis.ui.forms.EditQuestionForm
 import net.taler.anastasis.ui.forms.EditSmsForm
+import net.taler.common.CryptoUtils
 
 @Composable
 fun EditMethodDialog(
@@ -40,7 +40,7 @@ fun EditMethodDialog(
     onCancel: () -> Unit,
 ) {
     var localMethod by remember { mutableStateOf(method?.copy(
-        challenge = Utils.decodeBase32(method.challenge),
+        challenge = CryptoUtils.decodeCrock(method.challenge).toString(Charsets.UTF_8),
     )) }
     AlertDialog(
         onDismissRequest = onCancel,
@@ -73,7 +73,9 @@ fun EditMethodDialog(
             TextButton(onClick = {
                 localMethod?.let { onMethodEdited(
                     it.copy(
-                        challenge = Utils.encodeBase32(it.challenge)
+                        challenge = CryptoUtils.encodeCrock(
+                            it.challenge.toByteArray(Charsets.UTF_8),
+                        )
                     )
                 ) }
             }) {
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/forms/EditSecretForm.kt b/anastasis/src/main/java/net/taler/anastasis/ui/forms/EditSecretForm.kt
new file mode 100644
index 0000000..2c97e92
--- /dev/null
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/forms/EditSecretForm.kt
@@ -0,0 +1,85 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2023 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.anastasis.ui.forms
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.ImeAction
+import net.taler.anastasis.R
+import net.taler.anastasis.ui.theme.LocalSpacing
+import net.taler.common.Timestamp
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun EditSecretForm(
+    modifier: Modifier = Modifier,
+    name: String,
+    value: String,
+    expiration: Timestamp? = null,
+    onSecretEdited: (
+        name: String,
+        value: String,
+        expiration: Timestamp?,
+    ) -> Unit,
+) {
+    val focusRequester2 = remember { FocusRequester() }
+
+    Column(
+        modifier = modifier,
+    ) {
+        OutlinedTextField(
+            modifier = Modifier
+                .padding(
+                    start = LocalSpacing.current.medium,
+                    end = LocalSpacing.current.medium,
+                    bottom = LocalSpacing.current.small,
+                ).fillMaxWidth(),
+            value = name,
+            maxLines = 1,
+            keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
+            keyboardActions = KeyboardActions(onNext = { focusRequester2.requestFocus() }),
+            onValueChange = { onSecretEdited(it, value, expiration) },
+            label = { Text(stringResource(R.string.secret_name)) },
+            supportingText = { Text(stringResource(R.string.secret_unique)) },
+        )
+
+        OutlinedTextField(
+            modifier = Modifier
+                .focusRequester(focusRequester2)
+                .padding(
+                    start = LocalSpacing.current.medium,
+                    end = LocalSpacing.current.medium,
+                    bottom = LocalSpacing.current.small,
+                ).fillMaxWidth(),
+            value = value,
+            onValueChange = { onSecretEdited(name, it, expiration) },
+            label = { Text(stringResource(R.string.secret_text)) },
+        )
+    }
+}
\ No newline at end of file
diff --git a/anastasis/src/main/java/net/taler/anastasis/ui/home/HomeScreen.kt b/anastasis/src/main/java/net/taler/anastasis/ui/home/HomeScreen.kt
index cf24c48..8cee602 100644
--- a/anastasis/src/main/java/net/taler/anastasis/ui/home/HomeScreen.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/ui/home/HomeScreen.kt
@@ -51,7 +51,7 @@ fun HomeScreen(
                 icon = { Icon(Icons.Outlined.Upload, null) },
                 headline = stringResource(R.string.backup_secret),
                 onClick = {
-                    viewModel.reducerManager.startBackup()
+                    viewModel.reducerManager?.startBackup()
                 },
             )
 
@@ -64,7 +64,7 @@ fun HomeScreen(
                 icon = { Icon(Icons.Outlined.Download, null) },
                 headline = stringResource(R.string.recover_secret),
                 onClick = {
-                    viewModel.reducerManager.startRecovery()
+                    viewModel.reducerManager?.startRecovery()
                 },
             )
 
diff --git a/anastasis/src/main/java/net/taler/anastasis/viewmodels/ReducerViewModel.kt b/anastasis/src/main/java/net/taler/anastasis/viewmodels/ReducerViewModel.kt
index 46be209..ad90528 100644
--- a/anastasis/src/main/java/net/taler/anastasis/viewmodels/ReducerViewModel.kt
+++ b/anastasis/src/main/java/net/taler/anastasis/viewmodels/ReducerViewModel.kt
@@ -20,6 +20,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 import net.taler.anastasis.Routes
@@ -31,15 +32,25 @@ import net.taler.anastasis.models.ReducerState
 import net.taler.anastasis.reducers.ReducerManager
 import javax.inject.Inject
 
+interface ReducerViewModelI {
+    val reducerManager: ReducerManager?
+    val reducerState: StateFlow<ReducerState?>
+    val reducerError: StateFlow<TalerErrorInfo?>
+
+    fun goBack(): Boolean
+    fun goHome()
+    fun cleanError()
+}
+
 @HiltViewModel
-class ReducerViewModel @Inject constructor(): ViewModel() {
+class ReducerViewModel @Inject constructor(): ViewModel(), ReducerViewModelI {
     private val api = AnastasisReducerApi()
-    val reducerManager: ReducerManager
+    override val reducerManager: ReducerManager?
 
     private val _reducerState = MutableStateFlow<ReducerState?>(null)
-    val reducerState = _reducerState.asStateFlow()
+    override val reducerState = _reducerState.asStateFlow()
     private val _reducerError = MutableStateFlow<TalerErrorInfo?>(null)
-    val reducerError = _reducerError.asStateFlow()
+    override val reducerError = _reducerError.asStateFlow()
     private val _navRoute = MutableStateFlow(Routes.Home.route)
     val navRoute = _navRoute.asStateFlow()
 
@@ -57,11 +68,11 @@ class ReducerViewModel @Inject constructor(): ViewModel() {
                             reducerManager.startSyncingProviders()
                             Routes.SelectAuthMethods.route
                         }
-                        BackupStates.PoliciesReviewing -> Routes.ReviewPoliciesScreen.route
-                        BackupStates.SecretEditing -> TODO()
+                        BackupStates.PoliciesReviewing -> Routes.ReviewPolicies.route
+                        BackupStates.SecretEditing -> Routes.EditSecret.route
                         BackupStates.TruthsPaying -> TODO()
                         BackupStates.PoliciesPaying -> TODO()
-                        BackupStates.BackupFinished -> TODO()
+                        BackupStates.BackupFinished -> Routes.BackupFinished.route
                     }
                     is ReducerState.Recovery -> when (it.recoveryState) {
                         RecoveryStates.ContinentSelecting -> Routes.SelectContinent.route
@@ -79,14 +90,14 @@ class ReducerViewModel @Inject constructor(): ViewModel() {
         }
     }
 
-    fun goBack(): Boolean = when (val state = reducerState.value) {
+    override fun goBack(): Boolean = when (val state = reducerState.value) {
         is ReducerState.Backup -> when (state.backupState) {
             BackupStates.ContinentSelecting -> {
                 goHome()
                 false
             }
             else -> {
-                reducerManager.back()
+                reducerManager?.back()
                 false
             }
         }
@@ -96,22 +107,43 @@ class ReducerViewModel @Inject constructor(): ViewModel() {
                 false
             }
             else -> {
-                reducerManager.back()
+                reducerManager?.back()
                 false
             }
         }
         is ReducerState.Error -> {
-            reducerManager.back()
+            reducerManager?.back()
             false
         }
         else -> true
     }
 
-    fun goHome() {
+    override fun goHome() {
+        _reducerState.value = null
+    }
+
+    override fun cleanError() {
+        _reducerError.value = null
+    }
+}
+
+class FakeReducerViewModel(
+    state: ReducerState,
+    error: TalerErrorInfo? = null,
+): ReducerViewModelI {
+    override val reducerManager = null
+    private val _reducerState = MutableStateFlow<ReducerState?>(state)
+    override val reducerState: StateFlow<ReducerState?> = _reducerState.asStateFlow()
+    private val _reducerError = MutableStateFlow(error)
+    override val reducerError: StateFlow<TalerErrorInfo?> = _reducerError.asStateFlow()
+
+    override fun goBack(): Boolean = false
+
+    override fun goHome() {
         _reducerState.value = null
     }
 
-    fun cleanError() {
+    override fun cleanError() {
         _reducerError.value = null
     }
 }
\ No newline at end of file
diff --git a/anastasis/src/main/res/values/strings.xml b/anastasis/src/main/res/values/strings.xml
index bd903c1..5a6aecf 100644
--- a/anastasis/src/main/res/values/strings.xml
+++ b/anastasis/src/main/res/values/strings.xml
@@ -27,6 +27,7 @@
     <string name="provided_by">Provided by %1$s</string>
     <string name="disabled">Disabled</string>
     <string name="unknown">Unknown</string>
+    <string name="success">Success</string>
     <string name="error">Error</string>
     <string name="field_empty">This field is required</string>
     <string name="field_invalid">This field is invalid</string>
@@ -41,6 +42,7 @@
     <string name="select_auth_methods_title">Authentication methods</string>
     <string name="review_policies_title">Recovery policies</string>
     <string name="edit_secret_title">Provide secret to backup</string>
+    <string name="backup_finished_title">Your backup is complete!</string>
     <string name="add_auth_method_question">Add a question challenge</string>
     <string name="add_auth_method_sms">Add a SMS challenge</string>
     <string name="add_auth_method_email">Add an e-mail challenge</string>
@@ -62,4 +64,6 @@
     <string name="secret_name">Secret name</string>
     <string name="secret_unique">This should be unique</string>
     <string name="secret_text">Secret text</string>
+    <string name="backup_stored_providers">Your backup is being stored by the following providers:</string>
+    <string name="backup_policy_detail">Version %1$d expires at %2$s</string>
 </resources>
\ No newline at end of file
diff --git a/taler-kotlin-android/src/main/java/net/taler/common/Bech32.kt b/taler-kotlin-android/src/main/java/net/taler/common/Bech32.kt
index 4b77f85..c0c28fb 100644
--- a/taler-kotlin-android/src/main/java/net/taler/common/Bech32.kt
+++ b/taler-kotlin-android/src/main/java/net/taler/common/Bech32.kt
@@ -105,7 +105,7 @@ class Bech32 {
 
         fun generateFakeSegwitAddress(reservePub: String?, addr: String): List<String> {
             if (reservePub == null || reservePub.isEmpty()) return listOf()
-            val pub = CyptoUtils.decodeCrock(reservePub)
+            val pub = CryptoUtils.decodeCrock(reservePub)
             if (pub.size != 32) return listOf()
 
             val firstRnd = pub.copyOfRange(0, 4)
diff --git a/taler-kotlin-android/src/main/java/net/taler/common/CyptoUtils.kt b/taler-kotlin-android/src/main/java/net/taler/common/CryptoUtils.kt
index c1fbe8c..0dba7aa 100644
--- a/taler-kotlin-android/src/main/java/net/taler/common/CyptoUtils.kt
+++ b/taler-kotlin-android/src/main/java/net/taler/common/CryptoUtils.kt
@@ -18,7 +18,9 @@ package net.taler.common
 
 import kotlin.math.floor
 
-object CyptoUtils {
+object CryptoUtils {
+    private const val encTable = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
+
     internal fun getValue(c: Char): Int {
         val a = when (c) {
             'o','O' -> '0'
@@ -41,6 +43,30 @@ object CyptoUtils {
         throw Error("encoding error")
     }
 
+    fun encodeCrock(bytes: ByteArray): String {
+        var sb = ""
+        val size = bytes.size
+        var bitBuf = 0
+        var numBits = 0
+        var pos = 0
+        while (pos < size || numBits > 0) {
+            if (pos < size && numBits < 5) {
+                val d = bytes[pos++]
+                bitBuf = bitBuf.shl(8).or(d.toInt())
+                numBits += 8
+            }
+            if (numBits < 5) {
+                // zero-padding
+                bitBuf = bitBuf.shl(5 - numBits)
+                numBits = 5
+            }
+            val v = bitBuf.ushr(numBits - 5).and(31)
+            sb += encTable[v]
+            numBits -= 5
+        }
+        return sb
+    }
+
     fun decodeCrock(e: String): ByteArray {
         val size = e.length
         var bitpos = 0