seed: cleanup

src/apps/common/seed.py

@@ -1,3 +1,4 @@
+from micropython import const
 from trezor import wire
 from trezor.crypto import bip32, bip39
 from apps.common import cache, storage
@@ -6,11 +7,10 @@ from apps.common.request_passphrase import protect_by_passphrase
 _DEFAULT_CURVE = 'secp256k1'
 
 
-async def derive_node(ctx: wire.Context, path: list, curve_name=_DEFAULT_CURVE):
+async def derive_node(ctx: wire.Context, path: list, curve_name: str = _DEFAULT_CURVE) -> bip32.HDNode:
     seed = await _get_cached_seed(ctx)
     node = bip32.from_seed(seed, curve_name)
-    if path:
-        node.derive_path(path)
+    node.derive_path(path)
     return node
 
 
@@ -31,7 +31,7 @@ async def _get_cached_passphrase(ctx: wire.Context) -> str:
     return cache.get_passphrase()
 
 
-def derive_node_without_passphrase(path, curve_name=_DEFAULT_CURVE):
+def derive_node_without_passphrase(path: list, curve_name: str = _DEFAULT_CURVE) -> bip32.HDNode:
     if not storage.is_initialized():
         raise Exception('Device is not initialized')
 

src/apps/ethereum/sign_tx.py

@@ -122,12 +122,6 @@ async def send_signature(ctx, msg: EthereumSignTx, digest):
     return req
 
 
-def node_derive(root, address_n: list):
-    node = root.clone()
-    node.derive_path(address_n)
-    return node
-
-
 def check(msg: EthereumSignTx):
     if msg.tx_type not in [1, 6, None]:
         raise wire.DataError('tx_type out of bounds')