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146 lines
4.1 KiB
146 lines
4.1 KiB
from __future__ import annotations
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import io
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import typing as t
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from hashlib import sha256
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from trezorlib import cosi, definitions, messages, protobuf
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PRIVATE_KEYS_DEV = [byte * 32 for byte in (b"\xdd", b"\xde", b"\xdf")]
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def sign_with_privkeys(digest: bytes, privkeys: t.Sequence[bytes]) -> bytes:
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"""Locally produce a CoSi signature."""
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pubkeys = [cosi.pubkey_from_privkey(sk) for sk in privkeys]
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nonces = [cosi.get_nonce(sk, digest, i) for i, sk in enumerate(privkeys)]
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global_pk = cosi.combine_keys(pubkeys)
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global_R = cosi.combine_keys(R for _, R in nonces)
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sigs = [
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cosi.sign_with_privkey(digest, sk, global_pk, r, global_R)
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for sk, (r, _) in zip(privkeys, nonces)
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]
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return cosi.combine_sig(global_R, sigs)
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def make_network(
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chain_id: int = 0,
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slip44: int = 0,
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symbol: str = "FAKE",
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name: str = "Fake network",
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) -> messages.EthereumNetworkInfo:
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return messages.EthereumNetworkInfo(
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chain_id=chain_id,
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slip44=slip44,
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symbol=symbol,
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name=name,
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)
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def make_token(
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symbol: str = "FAKE",
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decimals: int = 18,
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address: bytes = b"",
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chain_id: int = 0,
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name: str = "Fake token",
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) -> messages.EthereumTokenInfo:
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return messages.EthereumTokenInfo(
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symbol=symbol,
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decimals=decimals,
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address=address,
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chain_id=chain_id,
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name=name,
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)
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def make_payload(
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data_type: messages.EthereumDefinitionType = messages.EthereumDefinitionType.NETWORK,
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timestamp: int = 0xFFFF_FFFF,
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message: messages.EthereumNetworkInfo
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| messages.EthereumTokenInfo
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| bytes = make_network(),
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) -> bytes:
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if isinstance(message, bytes):
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message_bytes = message
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else:
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writer = io.BytesIO()
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protobuf.dump_message(writer, message)
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message_bytes = writer.getvalue()
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payload = definitions.DefinitionPayload(
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magic=b"trzd1",
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data_type=data_type,
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timestamp=timestamp,
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data=message_bytes,
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)
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return payload.build()
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def sign_payload(
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payload: bytes,
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merkle_neighbors: list[bytes],
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threshold: int = 3,
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) -> tuple[bytes, bytes]:
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digest = sha256(b"\x00" + payload).digest()
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merkle_proof = []
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for item in merkle_neighbors:
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left, right = min(digest, item), max(digest, item)
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digest = sha256(b"\x01" + left + right).digest()
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merkle_proof.append(digest)
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merkle_proof = len(merkle_proof).to_bytes(1, "little") + b"".join(merkle_proof)
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signature = sign_with_privkeys(digest, PRIVATE_KEYS_DEV[:threshold])
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sigmask = 0
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for i in range(threshold):
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sigmask |= 1 << i
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sigmask_byte = sigmask.to_bytes(1, "little")
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return merkle_proof, sigmask_byte + signature
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def encode_network(
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network: messages.EthereumNetworkInfo | None = None,
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chain_id: int = 0,
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slip44: int = 0,
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symbol: str = "FAKE",
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name: str = "Fake network",
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) -> bytes:
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if network is None:
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network = make_network(chain_id, slip44, symbol, name)
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payload = make_payload(
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data_type=messages.EthereumDefinitionType.NETWORK, message=network
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)
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proof, signature = sign_payload(payload, [])
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return payload + proof + signature
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def encode_token(
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token: messages.EthereumTokenInfo | None = None,
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symbol: str = "FakeTok",
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decimals: int = 18,
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address: t.AnyStr = b"",
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chain_id: int = 0,
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name: str = "Fake token",
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) -> bytes:
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if token is None:
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if isinstance(address, str):
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if address.startswith("0x"):
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address = address[2:]
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address = bytes.fromhex(address) # type: ignore (typechecker is lying)
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token = make_token(symbol, decimals, address, chain_id, name) # type: ignore (typechecker is lying)
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payload = make_payload(
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data_type=messages.EthereumDefinitionType.TOKEN, message=token
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)
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proof, signature = sign_payload(payload, [])
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return payload + proof + signature
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def make_defs(
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network: bytes | None, token: bytes | None
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) -> messages.EthereumDefinitions:
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return messages.EthereumDefinitions(
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encoded_network=network,
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encoded_token=token,
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)
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