Add Cardano support

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 
 ## [Unreleased]
+- Add Cardano support
 
 ## 0.1.0
 - Initial release

CONTRIBUTING.md

@@ -92,8 +92,10 @@ The package is intended as a drop-in TypeScript replacement for the current
 - Public errors must keep the `{ code, message, err? }` shape. New public error
   behavior should go through `src/internal/errors.ts` and match the compatibility
   taxonomy unless there is an explicit reason to extend it.
-- BTC, Cardano, and BIP85 methods remain compatibility stubs in this iteration.
-  Do not document or test them as implemented until their protocol support lands.
+- BTC and BIP85 methods remain compatibility stubs in this iteration. Do not
+  document or test them as implemented until their protocol support lands.
+- Cardano xpub, address, and transaction-signing support is implemented; keep
+  it aligned with the Rust/WASM reference behavior and simulator vectors.
 
 `test/api-snapshot.test.ts` compares the built `dist/index.d.ts` against the
 checked-in `test/fixtures/bitbox_api.d.ts` fixture. To refresh the fixture,

README.md

@@ -10,12 +10,12 @@ does not require a WASM init step.
 ## Status
 
 - **Implemented:** WebHID and BitBoxBridge transports, Noise XX pairing,
-  Ethereum xpub/address/signing methods, antiklepto, transaction data
-  streaming, EIP-712 typed messages, and `ethIdentifyCase()`.
-- **Stubbed with `code: 'unsupported'`:** BTC, Cardano, and BIP85 methods.
-- **Stubbed with `code: 'not-implemented'`:** `deviceInfo()`,
-  `rootFingerprint()`, `showMnemonic()`, and `changePassword()`.
-  `product()` and `version()` are implemented.
+  device metadata helpers, Ethereum xpub/address/signing methods, antiklepto,
+  transaction data streaming, EIP-712 typed messages, `ethIdentifyCase()`,
+  and Cardano xpub/address/signing methods.
+- **Stubbed with `code: 'unsupported'`:** BTC and BIP85 methods.
+- **Stubbed with `code: 'not-implemented'`:** `showMnemonic()` and
+  `changePassword()`.
 
 ## Installation
 
@@ -49,10 +49,10 @@ import * as bitbox from '@bitboxswiss/bitbox-api';
 There is no `init()` call and no WASM loader. Existing Webpack/Vite WASM plugin
 configuration from `bitbox-api` is not needed for this package.
 
-The first TypeScript iteration is Ethereum-focused. BTC, Cardano, BIP85, and a
-few general device helpers are still present in the public type surface for
+BTC and BIP85 methods are still present in the public type surface for
 compatibility, but currently reject with typed errors as listed in
-[Status](#status).
+[Status](#status). Ethereum, Cardano, and the general device helpers listed
+above are wired through the TypeScript transport.
 
 ## Browser Requirements
 
@@ -197,6 +197,66 @@ defaults to `true` when omitted.
 await bb02.ethSignTypedMessage(1n, keypath, typedData);
 ```
 
+## Cardano Usage
+
+Cardano keypaths can be strings such as `m/1852'/1815'/0'/0/0` or number
+arrays. Coin amounts, fees, slots, withdrawals, and token amounts are `bigint`
+values; byte fields such as transaction hashes, policy IDs, asset names, pool
+key hashes, and DRep credential hashes are `Uint8Array`s.
+
+```ts
+if (!bb02.cardanoSupported()) {
+  throw new Error('This BitBox02 does not support Cardano');
+}
+
+const paymentKeypath = "m/1852'/1815'/0'/0/0";
+const stakeKeypath = "m/1852'/1815'/0'/2/0";
+
+const xpubs = await bb02.cardanoXpubs(["m/1852'/1815'/0'"]);
+const address = await bb02.cardanoAddress(
+  'mainnet',
+  {
+    pkhSkh: {
+      keypathPayment: paymentKeypath,
+      keypathStake: stakeKeypath,
+    },
+  },
+  true,
+);
+```
+
+Cardano transaction signing returns Shelley witnesses. Public keys and
+signatures are plain `number[]` arrays, matching the runtime shape of the old
+WASM package.
+
+```ts
+const result = await bb02.cardanoSignTransaction({
+  network: 'mainnet',
+  inputs: [
+    {
+      keypath: paymentKeypath,
+      prevOutHash: hexToBytes('59864ee73ca5d91098a32b3ce9811bac1996dcbaefa6b6247dcaafb5779c2538'),
+      prevOutIndex: 0,
+    },
+  ],
+  outputs: [
+    {
+      encodedAddress: address,
+      value: 1_000_000n,
+    },
+  ],
+  fee: 170_499n,
+  ttl: 41_115_811n,
+  certificates: [],
+  withdrawals: [],
+  validityIntervalStart: 41_110_811n,
+  allowZeroTTL: false,
+  tagCborSets: false,
+});
+
+console.log(result.shelleyWitnesses);
+```
+
 ## Typed Errors
 
 All public API entry points reject with, or can be normalized to, this shape:

sandbox/src/App.tsx

@@ -4,6 +4,7 @@ import { useState } from 'react';
 import * as bitbox from '@bitboxswiss/bitbox-api';
 import './App.css';
 
+import { Cardano } from './Cardano';
 import { Ethereum } from './Ethereum';
 import { General } from './General';
 import { ErrorNotification } from './ErrorNotification';
@@ -93,6 +94,11 @@ function App() {
             <Ethereum bb02={bb02} />
           </Accordion>
         )}
+        {bb02.cardanoSupported() && (
+          <Accordion title="Cardano">
+            <Cardano bb02={bb02} />
+          </Accordion>
+        )}
       </div>
     );
   }