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166 lines
5.9 KiB
166 lines
5.9 KiB
import ustruct as struct
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from micropython import const
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from trezor import wire
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from trezor.crypto.hashlib import blake2b
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from trezor.messages import InputScriptType
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from trezor.messages.SignTx import SignTx
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from trezor.messages.TransactionType import TransactionType
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from trezor.messages.TxInputType import TxInputType
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from trezor.utils import HashWriter, ensure
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from apps.common.coininfo import CoinInfo
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from apps.common.seed import Keychain
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from ..multisig import multisig_get_pubkeys
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from ..scripts import output_script_multisig, output_script_p2pkh
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from ..writers import (
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TX_HASH_SIZE,
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get_tx_hash,
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write_bytes_fixed,
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write_bytes_prefixed,
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write_bytes_reversed,
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write_uint32,
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write_uint64,
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write_varint,
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)
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from . import helpers
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from .bitcoinlike import Bitcoinlike
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if False:
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from typing import Union
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from .writers import Writer
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OVERWINTERED = const(0x80000000)
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class Overwintered(Bitcoinlike):
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def __init__(self, tx: SignTx, keychain: Keychain, coin: CoinInfo) -> None:
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ensure(coin.overwintered)
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super().__init__(tx, keychain, coin)
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if self.tx.version == 3:
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if not self.tx.branch_id:
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self.tx.branch_id = 0x5BA81B19 # Overwinter
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elif self.tx.version == 4:
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if not self.tx.branch_id:
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self.tx.branch_id = 0x76B809BB # Sapling
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else:
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raise wire.DataError("Unsupported version for overwintered transaction")
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async def step7_finish(self) -> None:
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self.write_tx_footer(self.serialized_tx, self.tx)
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if self.tx.version == 3:
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write_uint32(self.serialized_tx, self.tx.expiry) # expiryHeight
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write_varint(self.serialized_tx, 0) # nJoinSplit
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elif self.tx.version == 4:
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write_uint32(self.serialized_tx, self.tx.expiry) # expiryHeight
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write_uint64(self.serialized_tx, 0) # valueBalance
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write_varint(self.serialized_tx, 0) # nShieldedSpend
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write_varint(self.serialized_tx, 0) # nShieldedOutput
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write_varint(self.serialized_tx, 0) # nJoinSplit
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else:
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raise wire.DataError("Unsupported version for overwintered transaction")
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await helpers.request_tx_finish(self.tx_req)
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async def process_nonsegwit_input(self, txi: TxInputType) -> None:
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await self.process_bip143_input(txi)
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async def sign_nonsegwit_input(self, i_sign: int) -> None:
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await self.sign_nonsegwit_bip143_input(i_sign)
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def write_tx_header(
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self, w: Writer, tx: Union[SignTx, TransactionType], witness_marker: bool
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) -> None:
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# nVersion | fOverwintered
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write_uint32(w, tx.version | OVERWINTERED)
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write_uint32(w, tx.version_group_id) # nVersionGroupId
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# ZIP-0143 / ZIP-0243
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# ===
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def init_hash143(self) -> None:
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self.h_prevouts = HashWriter(blake2b(outlen=32, personal=b"ZcashPrevoutHash"))
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self.h_sequence = HashWriter(blake2b(outlen=32, personal=b"ZcashSequencHash"))
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self.h_outputs = HashWriter(blake2b(outlen=32, personal=b"ZcashOutputsHash"))
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def hash143_preimage_hash(self, txi: TxInputType, pubkeyhash: bytes) -> bytes:
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h_preimage = HashWriter(
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blake2b(
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outlen=32,
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personal=b"ZcashSigHash" + struct.pack("<I", self.tx.branch_id),
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)
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)
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# 1. nVersion | fOverwintered
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write_uint32(h_preimage, self.tx.version | OVERWINTERED)
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# 2. nVersionGroupId
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write_uint32(h_preimage, self.tx.version_group_id)
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# 3. hashPrevouts
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write_bytes_fixed(h_preimage, get_tx_hash(self.h_prevouts), TX_HASH_SIZE)
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# 4. hashSequence
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write_bytes_fixed(h_preimage, get_tx_hash(self.h_sequence), TX_HASH_SIZE)
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# 5. hashOutputs
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write_bytes_fixed(h_preimage, get_tx_hash(self.h_outputs), TX_HASH_SIZE)
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if self.tx.version == 3:
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# 6. hashJoinSplits
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write_bytes_fixed(h_preimage, b"\x00" * TX_HASH_SIZE, TX_HASH_SIZE)
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# 7. nLockTime
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write_uint32(h_preimage, self.tx.lock_time)
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# 8. expiryHeight
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write_uint32(h_preimage, self.tx.expiry)
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# 9. nHashType
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write_uint32(h_preimage, self.get_hash_type())
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elif self.tx.version == 4:
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zero_hash = b"\x00" * TX_HASH_SIZE
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# 6. hashJoinSplits
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write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE)
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# 7. hashShieldedSpends
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write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE)
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# 8. hashShieldedOutputs
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write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE)
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# 9. nLockTime
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write_uint32(h_preimage, self.tx.lock_time)
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# 10. expiryHeight
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write_uint32(h_preimage, self.tx.expiry)
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# 11. valueBalance
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write_uint64(h_preimage, 0)
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# 12. nHashType
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write_uint32(h_preimage, self.get_hash_type())
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else:
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raise wire.DataError("Unsupported version for overwintered transaction")
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# 10a /13a. outpoint
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write_bytes_reversed(h_preimage, txi.prev_hash, TX_HASH_SIZE)
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write_uint32(h_preimage, txi.prev_index)
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# 10b / 13b. scriptCode
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script_code = derive_script_code(txi, pubkeyhash)
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write_bytes_prefixed(h_preimage, script_code)
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# 10c / 13c. value
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write_uint64(h_preimage, txi.amount)
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# 10d / 13d. nSequence
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write_uint32(h_preimage, txi.sequence)
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return get_tx_hash(h_preimage)
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def derive_script_code(txi: TxInputType, pubkeyhash: bytes) -> bytearray:
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if txi.multisig:
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return output_script_multisig(
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multisig_get_pubkeys(txi.multisig), txi.multisig.m
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)
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p2pkh = txi.script_type == InputScriptType.SPENDADDRESS
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if p2pkh:
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return output_script_p2pkh(pubkeyhash)
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else:
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raise wire.DataError("Unknown input script type for zip143 script code")
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