Cobb
de2edafe61
The Rust SDK removed the low-level SecretStoreWrapper.putSecret/getSecret API between 26.03.x and 26.04.x — it was an escape hatch we were using to pin arbitrary bytes into a Matrix 4S slot. The SDK maintainers never contracted that primitive; locking it down lets their recovery code evolve without worrying about third-party storage. This commit replaces that dependency with a self-contained design we own end-to-end, so future SDK moves no longer break our backup flow. ### Design - Slot: `com.sulkta.wallet.seed.v1` in Matrix account data. Our namespace, not a Matrix-spec 4S slot — we are NOT impersonating Matrix secret storage, we are holding our own opaque blob. - Envelope (JSON): version tag, algorithm tag, random 12-byte IV, GCM output (ciphertext || tag), AAD = slot name. AES-256-GCM via stock javax.crypto. AAD binds a blob to its slot so a blob can't be lifted from one namespace and successfully opened in another. - Key: derived from the user's existing Matrix recovery key via HKDF-SHA256 with info label "sulkta.wallet.seed.v1". The info label guarantees we never produce the same key bytes Matrix uses for its own crypto — same secret, different domain. - I/O: client.setAccountData(key, json) + client.accountData(key) via the SDK; the homeserver only ever sees the opaque encrypted blob. ### Files - api/walletsecretstorage/WalletSecretStorage.kt — new interface - impl/walletsecretstorage/WalletSecretEnvelope.kt — AES-GCM envelope (with unit tests: round-trip, wrong key, tampered ct, tampered iv, wrong AAD, wrong version, malformed JSON) - impl/walletsecretstorage/RecoveryKeyDerivation.kt — base58 decode + parity check + HKDF-SHA256 (with unit tests: determinism, whitespace tolerance, distinct info labels → distinct keys) - impl/walletsecretstorage/MatrixAccountDataWalletSecretStorage.kt — WalletSecretStorage impl wrapping Client account data - test/walletsecretstorage/FakeWalletSecretStorage.kt — in-memory fake - api/MatrixClient.kt: old .secretStorage → .walletSecretStorage - features/wallet/.../WalletBackupServiceImpl.kt — rewired to use the new interface; hasBackupWithoutKey now goes through the same path instead of manually poking the raw Matrix HTTP API. - DELETED: api/secretstorage/SecretStorage.kt, SecretStore.kt, impl/ secretstorage/RustSecretStorage.kt — the old SDK-dependent path. ### Backward compat note Users who backed up a wallet seed on the OLD SDK have a blob in Matrix's 4S at `com.sulkta.cardano.wallet_seed`. This branch cannot read those. Since the prior integration was only tested internally, acceptable today — anyone with an old backup re-enters their mnemonic. |
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Element X Android
Element X Android is the next-generation Matrix client provided by Element.
Compared to the previous-generation Element Classic, the application is a total rewrite, using the Matrix Rust SDK underneath and targeting devices running Android 7+. The UI layer is written using Jetpack Compose, and the navigation is managed using Appyx.
Table of contents
- Screenshots
- Translations
- Rust SDK
- Status
- Minimum SDK version
- Contributing
- Build instructions
- Support
- Copyright and License
Screenshots
Here are some screenshots of the application:
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Translations
Element X Android supports many languages. You can help us to translate the app in your language by joining our Localazy project. You can also help us to improve the existing translations.
Note that for now, we keep control on the French and German translations.
Translations can be checked screen per screen using our tool Element X Android Gallery, available at https://element-hq.github.io/element-x-android/. Note that this page is updated every Tuesday.
More instructions about translating the application can be found at CONTRIBUTING.md.
Rust SDK
Element X leverages the Matrix Rust SDK through an FFI layer that the final client can directly import and use.
We're doing this as a way to share code between platforms and while we've seen promising results it's still in the experimental stage and bound to change.
Status
This project is actively developed and supported. New users are recommended to use Element X instead of the previous-generation app.
Minimum SDK version
Element X Android requires a minimum SDK version of 24 (Android 7.0, Nougat). We aim to support devices running Android 7.0 and above, which covers a wide range of devices still in use today.
Element Android Enterprise requires a minimum SDK version of 33 (Android 13, Tiramisu). For Element Enterprise, we support only devices that still receive security updates, which means devices running Android 13 and above. Android does not have a documented support policy, but some information can be found at https://endoflife.date/android.
Contributing
Want to get actively involved in the project? You're more than welcome! A good way to start is to check the issues that are labelled with the good first issue label. Let us know by commenting the issue that you're starting working on it.
But first make sure to read our contribution guide first.
You can also come chat with the community in the Matrix room dedicated to the project.
Build instructions
Just clone the project and open it in Android Studio. Make sure to select the
app configuration when building (as we also have sample apps in the project).
To build against a local copy of the Rust SDK, see the Developer onboarding instructions.
Support
When you are experiencing an issue on Element X Android, please first search in GitHub issues and then in #element-x-android:matrix.org. If after your research you still have a question, ask at #element-x-android:matrix.org. Otherwise feel free to create a GitHub issue if you encounter a bug or a crash, by explaining clearly in detail what happened. You can also perform bug reporting from the application settings. This is especially recommended when you encounter a crash.
Copyright and License
Copyright (c) 2025 Element Creations Ltd. Copyright (c) 2022 - 2025 New Vector Ltd.
This software is dual licensed by Element Creations Ltd (Element). It can be used either:
(1) for free under the terms of the GNU Affero General Public License (as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version); OR
(2) under the terms of a paid-for Element Commercial License agreement between you and Element (the terms of which may vary depending on what you and Element have agreed to).
Unless required by applicable law or agreed to in writing, software distributed under the Licenses is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licenses for the specific language governing permissions and limitations under the Licenses.