mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-25 07:48:10 +00:00
127 lines
3.7 KiB
Python
127 lines
3.7 KiB
Python
from ubinascii import unhexlify # noqa: F401
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from trezor import messages, protobuf
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from trezor.crypto import cosi
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from trezor.crypto.curve import ed25519
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from trezor.crypto.hashlib import sha256
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from trezor.enums import EthereumDefinitionType
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PRIVATE_KEYS_DEV = [byte * 32 for byte in (b"\xdd", b"\xde", b"\xdf")]
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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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prefix: bytes = b"trzd1",
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data_type: EthereumDefinitionType = EthereumDefinitionType.NETWORK,
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timestamp: int = 0xFFFF_FFFF,
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message: (
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messages.EthereumNetworkInfo | messages.EthereumTokenInfo | bytes
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) = make_network(),
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) -> bytes:
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payload = prefix
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payload += data_type.to_bytes(1, "little")
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payload += timestamp.to_bytes(4, "little")
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if isinstance(message, bytes):
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message_bytes = message
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else:
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message_bytes = protobuf.dump_message_buffer(message)
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payload += len(message_bytes).to_bytes(2, "little")
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payload += message_bytes
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return payload
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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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nonces, commits, pubkeys = [], [], []
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for i, private_key in enumerate(PRIVATE_KEYS_DEV[:threshold]):
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nonce, commit = cosi.commit()
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pubkey = ed25519.publickey(private_key)
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nonces.append(nonce)
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commits.append(commit)
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pubkeys.append(pubkey)
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global_commit = cosi.combine_publickeys(commits)
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global_pubkey = cosi.combine_publickeys(pubkeys)
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sigmask = 0
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signatures = []
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for i, nonce in enumerate(nonces):
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sigmask |= 1 << i
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sig = cosi.sign(
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PRIVATE_KEYS_DEV[i], digest, nonce, global_commit, global_pubkey
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)
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signatures.append(sig)
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signature = cosi.combine_signatures(global_commit, signatures)
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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(data_type=EthereumDefinitionType.NETWORK, message=network)
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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 = "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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) -> bytes:
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if token is None:
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token = make_token(symbol, decimals, address, chain_id, name)
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payload = make_payload(data_type=EthereumDefinitionType.TOKEN, message=token)
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proof, signature = sign_payload(payload, [])
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return payload + proof + signature
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