async def sign_tx(ctx: wire.Context, msg: EthereumSignTx,
keychain: Keychain) -> EthereumTxRequest:
check(msg)
await paths.validate_path(ctx, keychain, msg.address_n)
# Handle ERC20s
token, address_bytes, recipient, value = await handle_erc20(ctx, msg)
data_total = msg.data_length
await require_confirm_tx(ctx, recipient, value, msg.chain_id, token)
if token is None and msg.data_length > 0:
await require_confirm_data(ctx, msg.data_initial_chunk, data_total)
await require_confirm_fee(
ctx,
value,
int.from_bytes(msg.gas_price, "big"),
int.from_bytes(msg.gas_limit, "big"),
msg.chain_id,
token,
)
data = bytearray()
data += msg.data_initial_chunk
data_left = data_total - len(msg.data_initial_chunk)
total_length = get_total_length(msg, data_total)
sha = HashWriter(sha3_256(keccak=True))
rlp.write_header(sha, total_length, rlp.LIST_HEADER_BYTE)
if msg.tx_type is not None:
rlp.write(sha, msg.tx_type)
for field in (msg.nonce, msg.gas_price, msg.gas_limit, address_bytes,
msg.value):
rlp.write(sha, field)
if data_left == 0:
rlp.write(sha, data)
else:
rlp.write_header(sha, data_total, rlp.STRING_HEADER_BYTE, data)
sha.extend(data)
while data_left > 0:
resp = await send_request_chunk(ctx, data_left)
data_left -= len(resp.data_chunk)
sha.extend(resp.data_chunk)
# eip 155 replay protection
rlp.write(sha, msg.chain_id)
rlp.write(sha, 0)
rlp.write(sha, 0)
digest = sha.get_digest()
result = sign_digest(msg, keychain, digest)
return result
def write_access_list(w: HashWriter,
access_list: list[EthereumAccessList]) -> None:
payload_length = sum(access_list_item_length(i) for i in access_list)
rlp.write_header(w, payload_length, rlp.LIST_HEADER_BYTE)
for item in access_list:
address_bytes = bytes_from_address(item.address)
address_length = rlp.length(address_bytes)
keys_length = rlp.length(item.storage_keys)
rlp.write_header(w, address_length + keys_length, rlp.LIST_HEADER_BYTE)
rlp.write(w, address_bytes)
rlp.write(w, item.storage_keys)
async def sign_tx_eip1559(ctx: wire.Context, msg: EthereumSignTxEIP1559,
keychain: Keychain) -> EthereumTxRequest:
check(msg)
await paths.validate_path(ctx, keychain, msg.address_n)
# Handle ERC20s
token, address_bytes, recipient, value = await handle_erc20(ctx, msg)
data_total = msg.data_length
await require_confirm_tx(ctx, recipient, value, msg.chain_id, token)
if token is None and msg.data_length > 0:
await require_confirm_data(ctx, msg.data_initial_chunk, data_total)
await require_confirm_eip1559_fee(
ctx,
int.from_bytes(msg.max_priority_fee, "big"),
int.from_bytes(msg.max_gas_fee, "big"),
int.from_bytes(msg.gas_limit, "big"),
msg.chain_id,
)
data = bytearray()
data += msg.data_initial_chunk
data_left = data_total - len(msg.data_initial_chunk)
total_length = get_total_length(msg, data_total)
sha = HashWriter(sha3_256(keccak=True))
rlp.write(sha, TX_TYPE)
rlp.write_header(sha, total_length, rlp.LIST_HEADER_BYTE)
fields: Tuple[rlp.RLPItem, ...] = (
msg.chain_id,
msg.nonce,
msg.max_priority_fee,
msg.max_gas_fee,
msg.gas_limit,
address_bytes,
msg.value,
)
for field in fields:
rlp.write(sha, field)
if data_left == 0:
rlp.write(sha, data)
else:
rlp.write_header(sha, data_total, rlp.STRING_HEADER_BYTE, data)
sha.extend(data)
while data_left > 0:
resp = await send_request_chunk(ctx, data_left)
data_left -= len(resp.data_chunk)
sha.extend(resp.data_chunk)
write_access_list(sha, msg.access_list)
digest = sha.get_digest()
result = sign_digest(msg, keychain, digest)
return result