mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-02 12:38:43 +00:00
96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
from trezor import wire
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from apps.common import HARDENED, paths
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from apps.common.keychain import get_keychain
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from . import CURVE, networks
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if False:
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from typing import Callable, Iterable
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from typing_extensions import Protocol
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from protobuf import MessageType
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from trezor.messages.EthereumSignTx import EthereumSignTx
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from apps.common.keychain import MsgOut, Handler, HandlerWithKeychain
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class MsgWithAddressN(MessageType, Protocol):
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address_n: paths.Bip32Path
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# We believe Ethereum should use 44'/60'/a' for everything, because it is
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# account-based, rather than UTXO-based. Unfortunately, lot of Ethereum
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# tools (MEW, Metamask) do not use such scheme and set a = 0 and then
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# iterate the address index i. For compatibility, we allow this scheme as well.
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PATTERNS_ADDRESS = (paths.PATTERN_BIP44, paths.PATTERN_SEP5)
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def _schemas_from_address_n(
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patterns: Iterable[str], address_n: paths.Bip32Path
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) -> Iterable[paths.PathSchema]:
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if len(address_n) < 2:
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return ()
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slip44_hardened = address_n[1]
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if slip44_hardened not in networks.all_slip44_ids_hardened():
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return ()
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if not slip44_hardened & HARDENED:
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return ()
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slip44_id = slip44_hardened - HARDENED
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return (paths.PathSchema(pattern, slip44_id) for pattern in patterns)
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def with_keychain_from_path(
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*patterns: str,
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) -> Callable[
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[HandlerWithKeychain[MsgWithAddressN, MsgOut]], Handler[MsgWithAddressN, MsgOut]
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]:
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def decorator(
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func: HandlerWithKeychain[MsgWithAddressN, MsgOut]
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) -> Handler[MsgWithAddressN, MsgOut]:
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async def wrapper(ctx: wire.Context, msg: MsgWithAddressN) -> MsgOut:
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schemas = _schemas_from_address_n(patterns, msg.address_n)
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keychain = await get_keychain(ctx, CURVE, schemas)
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with keychain:
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return await func(ctx, msg, keychain)
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return wrapper
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return decorator
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def _schemas_from_chain_id(msg: EthereumSignTx) -> Iterable[paths.PathSchema]:
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if msg.chain_id is None:
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return _schemas_from_address_n(PATTERNS_ADDRESS, msg.address_n)
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info = networks.by_chain_id(msg.chain_id)
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if info is None:
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# allow Ethereum or testnet paths for unknown networks
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slip44_id = (60, 1)
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elif networks.is_wanchain(msg.chain_id, msg.tx_type):
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slip44_id = (networks.SLIP44_WANCHAIN,)
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elif info.slip44 != 60 and info.slip44 != 1:
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# allow cross-signing with Ethereum unless it's testnet
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slip44_id = (info.slip44, 60)
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else:
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slip44_id = (info.slip44,)
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return (paths.PathSchema(pattern, slip44_id) for pattern in PATTERNS_ADDRESS)
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def with_keychain_from_chain_id(
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func: HandlerWithKeychain[EthereumSignTx, MsgOut]
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) -> Handler[EthereumSignTx, MsgOut]:
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# this is only for SignTx, and only PATTERN_ADDRESS is allowed
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async def wrapper(ctx: wire.Context, msg: EthereumSignTx) -> MsgOut:
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schemas = _schemas_from_chain_id(msg)
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keychain = await get_keychain(ctx, CURVE, schemas)
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with keychain:
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return await func(ctx, msg, keychain)
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return wrapper
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