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166 lines
4.8 KiB
166 lines
4.8 KiB
from trezor.crypto.hashlib import sha256
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from trezor.messages import PrevTx, SignTx, TxInput, TxOutput
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from trezor.utils import HashWriter
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from apps.common import coininfo
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from .. import scripts, writers
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from ..common import tagged_hashwriter
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if False:
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from typing import Protocol, Sequence
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class SigHasher(Protocol):
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def add_input(self, txi: TxInput, script_pubkey: bytes) -> None:
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...
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def add_output(self, txo: TxOutput, script_pubkey: bytes) -> None:
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...
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def hash143(
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self,
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txi: TxInput,
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public_keys: Sequence[bytes | memoryview],
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threshold: int,
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tx: SignTx | PrevTx,
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coin: coininfo.CoinInfo,
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sighash_type: int,
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) -> bytes:
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...
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def hash341(
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self,
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i: int,
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tx: SignTx | PrevTx,
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sighash_type: int,
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) -> bytes:
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...
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# BIP-0143 hash
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class BitcoinSigHasher:
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def __init__(self) -> None:
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self.h_prevouts = HashWriter(sha256())
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self.h_amounts = HashWriter(sha256())
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self.h_scriptpubkeys = HashWriter(sha256())
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self.h_sequences = HashWriter(sha256())
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self.h_outputs = HashWriter(sha256())
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def add_input(self, txi: TxInput, script_pubkey: bytes) -> None:
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writers.write_bytes_reversed(
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self.h_prevouts, txi.prev_hash, writers.TX_HASH_SIZE
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)
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writers.write_uint32(self.h_prevouts, txi.prev_index)
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writers.write_uint64(self.h_amounts, txi.amount)
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writers.write_bytes_prefixed(self.h_scriptpubkeys, script_pubkey)
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writers.write_uint32(self.h_sequences, txi.sequence)
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def add_output(self, txo: TxOutput, script_pubkey: bytes) -> None:
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writers.write_tx_output(self.h_outputs, txo, script_pubkey)
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def hash143(
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self,
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txi: TxInput,
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public_keys: Sequence[bytes | memoryview],
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threshold: int,
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tx: SignTx | PrevTx,
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coin: coininfo.CoinInfo,
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sighash_type: int,
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) -> bytes:
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h_preimage = HashWriter(sha256())
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# nVersion
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writers.write_uint32(h_preimage, tx.version)
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# hashPrevouts
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prevouts_hash = writers.get_tx_hash(
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self.h_prevouts, double=coin.sign_hash_double
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)
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writers.write_bytes_fixed(h_preimage, prevouts_hash, writers.TX_HASH_SIZE)
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# hashSequence
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sequence_hash = writers.get_tx_hash(
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self.h_sequences, double=coin.sign_hash_double
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)
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writers.write_bytes_fixed(h_preimage, sequence_hash, writers.TX_HASH_SIZE)
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# outpoint
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writers.write_bytes_reversed(h_preimage, txi.prev_hash, writers.TX_HASH_SIZE)
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writers.write_uint32(h_preimage, txi.prev_index)
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# scriptCode
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scripts.write_bip143_script_code_prefixed(
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h_preimage, txi, public_keys, threshold, coin
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)
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# amount
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writers.write_uint64(h_preimage, txi.amount)
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# nSequence
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writers.write_uint32(h_preimage, txi.sequence)
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# hashOutputs
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outputs_hash = writers.get_tx_hash(self.h_outputs, double=coin.sign_hash_double)
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writers.write_bytes_fixed(h_preimage, outputs_hash, writers.TX_HASH_SIZE)
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# nLockTime
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writers.write_uint32(h_preimage, tx.lock_time)
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# nHashType
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writers.write_uint32(h_preimage, sighash_type)
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return writers.get_tx_hash(h_preimage, double=coin.sign_hash_double)
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def hash341(
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self,
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i: int,
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tx: SignTx | PrevTx,
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sighash_type: int,
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) -> bytes:
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h_sigmsg = tagged_hashwriter(b"TapSighash")
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# sighash epoch 0
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writers.write_uint8(h_sigmsg, 0)
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# nHashType
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writers.write_uint8(h_sigmsg, sighash_type & 0xFF)
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# nVersion
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writers.write_uint32(h_sigmsg, tx.version)
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# nLockTime
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writers.write_uint32(h_sigmsg, tx.lock_time)
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# sha_prevouts
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writers.write_bytes_fixed(
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h_sigmsg, self.h_prevouts.get_digest(), writers.TX_HASH_SIZE
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)
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# sha_amounts
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writers.write_bytes_fixed(
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h_sigmsg, self.h_amounts.get_digest(), writers.TX_HASH_SIZE
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)
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# sha_scriptpubkeys
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writers.write_bytes_fixed(
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h_sigmsg, self.h_scriptpubkeys.get_digest(), writers.TX_HASH_SIZE
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)
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# sha_sequences
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writers.write_bytes_fixed(
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h_sigmsg, self.h_sequences.get_digest(), writers.TX_HASH_SIZE
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)
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# sha_outputs
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writers.write_bytes_fixed(
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h_sigmsg, self.h_outputs.get_digest(), writers.TX_HASH_SIZE
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)
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# spend_type 0 (no tapscript message extension, no annex)
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writers.write_uint8(h_sigmsg, 0)
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# input_index
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writers.write_uint32(h_sigmsg, i)
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return h_sigmsg.get_digest()
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