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576 lines
17 KiB
576 lines
17 KiB
from trezor import utils, wire
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from trezor.crypto import base58, cashaddr
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from trezor.crypto.hashlib import sha256
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from trezor.messages import InputScriptType
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from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
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from trezor.messages.TxInputType import TxInputType
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from apps.common import address_type
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from apps.common.coininfo import CoinInfo
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from apps.common.readers import read_bitcoin_varint
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from apps.common.writers import empty_bytearray, write_bitcoin_varint
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from . import common
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from .multisig import (
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multisig_get_pubkey_count,
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multisig_get_pubkeys,
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multisig_pubkey_index,
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)
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from .readers import read_bytes_prefixed, read_op_push
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from .writers import (
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write_bytes_fixed,
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write_bytes_prefixed,
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write_bytes_unchecked,
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write_op_push,
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)
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if False:
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from typing import List, Optional, Tuple
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from trezor.messages.TxInputType import EnumTypeInputScriptType
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from .writers import Writer
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def input_derive_script(
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script_type: EnumTypeInputScriptType,
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multisig: MultisigRedeemScriptType,
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coin: CoinInfo,
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hash_type: int,
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pubkey: bytes,
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signature: Optional[bytes],
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) -> bytes:
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if script_type == InputScriptType.SPENDADDRESS:
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# p2pkh or p2sh
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return input_script_p2pkh_or_p2sh(pubkey, signature, hash_type)
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if script_type == InputScriptType.SPENDP2SHWITNESS:
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# p2wpkh or p2wsh using p2sh
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if multisig:
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# p2wsh in p2sh
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pubkeys = multisig_get_pubkeys(multisig)
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witness_script_hasher = utils.HashWriter(sha256())
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write_output_script_multisig(witness_script_hasher, pubkeys, multisig.m)
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witness_script_hash = witness_script_hasher.get_digest()
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return input_script_p2wsh_in_p2sh(witness_script_hash)
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# p2wpkh in p2sh
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return input_script_p2wpkh_in_p2sh(common.ecdsa_hash_pubkey(pubkey, coin))
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elif script_type == InputScriptType.SPENDWITNESS:
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# native p2wpkh or p2wsh
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return input_script_native_p2wpkh_or_p2wsh()
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elif script_type == InputScriptType.SPENDMULTISIG:
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# p2sh multisig
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signature_index = multisig_pubkey_index(multisig, pubkey)
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return input_script_multisig(
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multisig, signature, signature_index, hash_type, coin
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)
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else:
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raise wire.ProcessError("Invalid script type")
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def output_derive_script(address: str, coin: CoinInfo) -> bytes:
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if coin.bech32_prefix and address.startswith(coin.bech32_prefix):
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# p2wpkh or p2wsh
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witprog = common.decode_bech32_address(coin.bech32_prefix, address)
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return output_script_native_p2wpkh_or_p2wsh(witprog)
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if (
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not utils.BITCOIN_ONLY
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and coin.cashaddr_prefix is not None
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and address.startswith(coin.cashaddr_prefix + ":")
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):
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prefix, addr = address.split(":")
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version, data = cashaddr.decode(prefix, addr)
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if version == cashaddr.ADDRESS_TYPE_P2KH:
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version = coin.address_type
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elif version == cashaddr.ADDRESS_TYPE_P2SH:
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version = coin.address_type_p2sh
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else:
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raise wire.DataError("Unknown cashaddr address type")
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raw_address = bytes([version]) + data
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else:
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try:
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raw_address = base58.decode_check(address, coin.b58_hash)
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except ValueError:
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raise wire.DataError("Invalid address")
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if address_type.check(coin.address_type, raw_address):
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# p2pkh
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pubkeyhash = address_type.strip(coin.address_type, raw_address)
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script = output_script_p2pkh(pubkeyhash)
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return script
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elif address_type.check(coin.address_type_p2sh, raw_address):
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# p2sh
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scripthash = address_type.strip(coin.address_type_p2sh, raw_address)
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script = output_script_p2sh(scripthash)
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return script
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raise wire.DataError("Invalid address type")
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# see https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki#specification
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# item 5 for details
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def bip143_derive_script_code(
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txi: TxInputType, public_keys: List[bytes], threshold: int, coin: CoinInfo
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) -> bytearray:
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if len(public_keys) > 1:
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return output_script_multisig(public_keys, threshold)
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p2pkh = (
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txi.script_type == InputScriptType.SPENDWITNESS
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or txi.script_type == InputScriptType.SPENDP2SHWITNESS
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or txi.script_type == InputScriptType.SPENDADDRESS
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or txi.script_type == InputScriptType.EXTERNAL
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)
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if p2pkh:
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# for p2wpkh in p2sh or native p2wpkh
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# the scriptCode is a classic p2pkh
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return output_script_p2pkh(common.ecdsa_hash_pubkey(public_keys[0], coin))
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else:
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raise wire.DataError("Unknown input script type for bip143 script code")
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# P2PKH, P2SH
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# ===
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# https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki
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def input_script_p2pkh_or_p2sh(
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pubkey: bytes, signature: bytes, hash_type: int
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) -> bytearray:
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w = empty_bytearray(5 + len(signature) + 1 + 5 + len(pubkey))
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append_signature(w, signature, hash_type)
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append_pubkey(w, pubkey)
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return w
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def parse_input_script_p2pkh(script_sig: bytes) -> Tuple[bytes, bytes, int]:
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try:
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r = utils.BufferReader(script_sig)
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n = read_op_push(r)
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signature = r.read(n - 1)
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hash_type = r.get()
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n = read_op_push(r)
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pubkey = r.read()
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if len(pubkey) != n:
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raise ValueError
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except (ValueError, EOFError):
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wire.DataError("Invalid scriptSig.")
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return pubkey, signature, hash_type
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def output_script_p2pkh(pubkeyhash: bytes) -> bytearray:
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utils.ensure(len(pubkeyhash) == 20)
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s = bytearray(25)
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s[0] = 0x76 # OP_DUP
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s[1] = 0xA9 # OP_HASH_160
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s[2] = 0x14 # pushing 20 bytes
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s[3:23] = pubkeyhash
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s[23] = 0x88 # OP_EQUALVERIFY
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s[24] = 0xAC # OP_CHECKSIG
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return s
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def output_script_p2sh(scripthash: bytes) -> bytearray:
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# A9 14 <scripthash> 87
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utils.ensure(len(scripthash) == 20)
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s = bytearray(23)
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s[0] = 0xA9 # OP_HASH_160
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s[1] = 0x14 # pushing 20 bytes
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s[2:22] = scripthash
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s[22] = 0x87 # OP_EQUAL
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return s
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# SegWit: Native P2WPKH or P2WSH
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# ===
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# https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wpkh
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# https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wsh
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#
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# P2WPKH (Pay-to-Witness-Public-Key-Hash) is the segwit native P2PKH.
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# Not backwards compatible.
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#
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# P2WSH (Pay-to-Witness-Script-Hash) is segwit native P2SH.
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# Not backwards compatible.
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def input_script_native_p2wpkh_or_p2wsh() -> bytearray:
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# Completely replaced by the witness and therefore empty.
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return bytearray(0)
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def output_script_native_p2wpkh_or_p2wsh(witprog: bytes) -> bytearray:
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# Either:
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# 00 14 <20-byte-key-hash>
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# 00 20 <32-byte-script-hash>
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length = len(witprog)
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utils.ensure(length == 20 or length == 32)
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w = empty_bytearray(3 + length)
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w.append(0x00) # witness version byte
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w.append(length) # pub key hash length is 20 (P2WPKH) or 32 (P2WSH) bytes
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write_bytes_fixed(w, witprog, length) # pub key hash
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return w
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# SegWit: P2WPKH nested in P2SH
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# ===
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# https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#witness-program
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#
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# P2WPKH is nested in P2SH to be backwards compatible.
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# Uses normal P2SH output scripts.
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def input_script_p2wpkh_in_p2sh(pubkeyhash: bytes) -> bytearray:
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# 16 00 14 <pubkeyhash>
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# Signature is moved to the witness.
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utils.ensure(len(pubkeyhash) == 20)
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w = empty_bytearray(3 + len(pubkeyhash))
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w.append(0x16) # length of the data
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w.append(0x00) # witness version byte
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w.append(0x14) # P2WPKH witness program (pub key hash length)
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write_bytes_fixed(w, pubkeyhash, 20) # pub key hash
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return w
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# SegWit: P2WSH nested in P2SH
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# ===
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# https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wsh-nested-in-bip16-p2sh
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#
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# P2WSH is nested in P2SH to be backwards compatible.
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# Uses normal P2SH output scripts.
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def input_script_p2wsh_in_p2sh(script_hash: bytes) -> bytearray:
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# 22 00 20 <redeem script hash>
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# Signature is moved to the witness.
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if len(script_hash) != 32:
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raise wire.DataError("Redeem script hash should be 32 bytes long")
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w = empty_bytearray(3 + len(script_hash))
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w.append(0x22) # length of the data
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w.append(0x00) # witness version byte
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w.append(0x20) # P2WSH witness program (redeem script hash length)
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write_bytes_fixed(w, script_hash, 32)
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return w
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# SegWit: Witness getters
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# ===
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def witness_p2wpkh(signature: bytes, pubkey: bytes, hash_type: int) -> bytearray:
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w = empty_bytearray(1 + 5 + len(signature) + 1 + 5 + len(pubkey))
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write_bitcoin_varint(w, 0x02) # num of segwit items, in P2WPKH it's always 2
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write_signature_prefixed(w, signature, hash_type)
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write_bytes_prefixed(w, pubkey)
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return w
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def parse_witness_p2wpkh(witness: bytes) -> Tuple[bytes, bytes, int]:
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try:
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r = utils.BufferReader(witness)
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if r.get() != 2:
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# num of stack items, in P2WPKH it's always 2
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raise ValueError
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n = read_bitcoin_varint(r)
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signature = r.read(n - 1)
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hash_type = r.get()
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pubkey = read_bytes_prefixed(r)
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if r.remaining_count():
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raise ValueError
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except (ValueError, EOFError):
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raise wire.DataError("Invalid witness.")
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return pubkey, signature, hash_type
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def witness_multisig(
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multisig: MultisigRedeemScriptType,
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signature: bytes,
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signature_index: int,
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hash_type: int,
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) -> bytearray:
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# get other signatures, stretch with None to the number of the pubkeys
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signatures = multisig.signatures + [None] * (
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multisig_get_pubkey_count(multisig) - len(multisig.signatures)
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)
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# fill in our signature
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if signatures[signature_index]:
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raise wire.DataError("Invalid multisig parameters")
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signatures[signature_index] = signature
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# filter empty
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signatures = [s for s in signatures if s]
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# witness program + signatures + redeem script
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num_of_witness_items = 1 + len(signatures) + 1
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# length of the redeem script
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pubkeys = multisig_get_pubkeys(multisig)
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redeem_script_length = output_script_multisig_length(pubkeys, multisig.m)
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# length of the result
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total_length = 1 + 1 # number of items, OP_FALSE
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for s in signatures:
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total_length += 1 + len(s) + 1 # length, signature, hash_type
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total_length += 1 + redeem_script_length # length, script
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w = empty_bytearray(total_length)
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write_bitcoin_varint(w, num_of_witness_items)
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# Starts with OP_FALSE because of an old OP_CHECKMULTISIG bug, which
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# consumes one additional item on the stack:
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# https://bitcoin.org/en/developer-guide#standard-transactions
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write_bitcoin_varint(w, 0)
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for s in signatures:
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write_signature_prefixed(w, s, hash_type) # size of the witness included
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# redeem script
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write_bitcoin_varint(w, redeem_script_length)
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write_output_script_multisig(w, pubkeys, multisig.m)
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return w
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def parse_witness_multisig(witness: bytes) -> Tuple[bytes, List[Tuple[bytes, int]]]:
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try:
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r = utils.BufferReader(witness)
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# Get number of witness stack items.
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item_count = read_bitcoin_varint(r)
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# Skip over OP_FALSE, which is due to the old OP_CHECKMULTISIG bug.
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if r.get() != 0:
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raise ValueError
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signatures = []
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for i in range(item_count - 2):
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n = read_bitcoin_varint(r)
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signature = r.read(n - 1)
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hash_type = r.get()
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signatures.append((signature, hash_type))
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script = read_bytes_prefixed(r)
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if r.remaining_count():
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raise ValueError
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except (ValueError, EOFError):
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raise wire.DataError("Invalid witness.")
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return script, signatures
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# Multisig
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# ===
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#
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# Used either as P2SH, P2WSH, or P2WSH nested in P2SH.
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def input_script_multisig(
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multisig: MultisigRedeemScriptType,
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signature: bytes,
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signature_index: int,
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hash_type: int,
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coin: CoinInfo,
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) -> bytearray:
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signatures = multisig.signatures # other signatures
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if len(signatures[signature_index]) > 0:
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raise wire.DataError("Invalid multisig parameters")
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signatures[signature_index] = signature # our signature
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# length of the redeem script
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pubkeys = multisig_get_pubkeys(multisig)
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redeem_script_length = output_script_multisig_length(pubkeys, multisig.m)
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# length of the result
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total_length = 0
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if utils.BITCOIN_ONLY or not coin.decred:
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total_length += 1 # OP_FALSE
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for s in signatures:
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total_length += 1 + len(s) + 1 # length, signature, hash_type
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total_length += 1 + redeem_script_length # length, script
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w = empty_bytearray(total_length)
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if utils.BITCOIN_ONLY or not coin.decred:
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# Starts with OP_FALSE because of an old OP_CHECKMULTISIG bug, which
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# consumes one additional item on the stack:
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# https://bitcoin.org/en/developer-guide#standard-transactions
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w.append(0x00)
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for s in signatures:
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if len(s):
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append_signature(w, s, hash_type)
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# redeem script
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write_op_push(w, redeem_script_length)
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write_output_script_multisig(w, pubkeys, multisig.m)
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return w
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def parse_input_script_multisig(
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script_sig: bytes,
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) -> Tuple[bytes, List[Tuple[bytes, int]]]:
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try:
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r = utils.BufferReader(script_sig)
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# Skip over OP_FALSE, which is due to the old OP_CHECKMULTISIG bug.
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if r.get() != 0:
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raise ValueError
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signatures = []
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n = read_op_push(r)
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while r.remaining_count() > n:
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signature = r.read(n - 1)
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hash_type = r.get()
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signatures.append((signature, hash_type))
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n = read_op_push(r)
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script = r.read()
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if len(script) != n:
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raise ValueError
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except (ValueError, EOFError):
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raise wire.DataError("Invalid scriptSig.")
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return script, signatures
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def output_script_multisig(pubkeys: List[bytes], m: int) -> bytearray:
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w = empty_bytearray(output_script_multisig_length(pubkeys, m))
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write_output_script_multisig(w, pubkeys, m)
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return w
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def write_output_script_multisig(w: Writer, pubkeys: List[bytes], m: int) -> None:
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n = len(pubkeys)
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if n < 1 or n > 15 or m < 1 or m > 15 or m > n:
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raise wire.DataError("Invalid multisig parameters")
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for pubkey in pubkeys:
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if len(pubkey) != 33:
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raise wire.DataError("Invalid multisig parameters")
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w.append(0x50 + m) # numbers 1 to 16 are pushed as 0x50 + value
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for p in pubkeys:
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append_pubkey(w, p)
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w.append(0x50 + n)
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w.append(0xAE) # OP_CHECKMULTISIG
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def output_script_multisig_length(pubkeys: List[bytes], m: int) -> int:
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return 1 + len(pubkeys) * (1 + 33) + 1 + 1 # see output_script_multisig
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def parse_output_script_multisig(script: bytes) -> Tuple[List[bytes], int]:
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try:
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r = utils.BufferReader(script)
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threshold = r.get() - 0x50
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pubkey_count = script[-2] - 0x50
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if (
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not 1 <= threshold <= 15
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or not 1 <= pubkey_count <= 15
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or threshold > pubkey_count
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):
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raise ValueError
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public_keys = []
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for i in range(pubkey_count):
|
|
n = read_op_push(r)
|
|
if n != 33:
|
|
raise ValueError
|
|
public_keys.append(r.read(n))
|
|
|
|
r.get() # ignore pubkey_count
|
|
if r.get() != 0xAE: # OP_CHECKMULTISIG
|
|
raise ValueError
|
|
if r.remaining_count():
|
|
raise ValueError
|
|
|
|
except (ValueError, IndexError, EOFError):
|
|
raise wire.DataError("Invalid multisig script")
|
|
|
|
return public_keys, threshold
|
|
|
|
|
|
# OP_RETURN
|
|
# ===
|
|
|
|
|
|
def output_script_paytoopreturn(data: bytes) -> bytearray:
|
|
w = empty_bytearray(1 + 5 + len(data))
|
|
w.append(0x6A) # OP_RETURN
|
|
write_op_push(w, len(data))
|
|
w.extend(data)
|
|
return w
|
|
|
|
|
|
# BIP-322: SignatureProof container for scriptSig & witness
|
|
# ===
|
|
# https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki
|
|
|
|
|
|
def write_bip322_signature_proof(
|
|
w: Writer,
|
|
script_type: EnumTypeInputScriptType,
|
|
multisig: MultisigRedeemScriptType,
|
|
coin: CoinInfo,
|
|
public_key: bytes,
|
|
signature: bytes,
|
|
) -> None:
|
|
script_sig = input_derive_script(
|
|
script_type, multisig, coin, common.SIGHASH_ALL, public_key, signature
|
|
)
|
|
if script_type in common.SEGWIT_INPUT_SCRIPT_TYPES:
|
|
if multisig:
|
|
# find the place of our signature based on the public key
|
|
signature_index = multisig_pubkey_index(multisig, public_key)
|
|
witness = witness_multisig(
|
|
multisig, signature, signature_index, common.SIGHASH_ALL
|
|
)
|
|
else:
|
|
witness = witness_p2wpkh(signature, public_key, common.SIGHASH_ALL)
|
|
else:
|
|
# Zero entries in witness stack.
|
|
witness = bytearray(b"\x00")
|
|
|
|
write_bytes_prefixed(w, script_sig)
|
|
w.extend(witness)
|
|
|
|
|
|
def read_bip322_signature_proof(r: utils.BufferReader) -> Tuple[bytes, bytes]:
|
|
script_sig = read_bytes_prefixed(r)
|
|
witness = r.read()
|
|
return script_sig, witness
|
|
|
|
|
|
# Helpers
|
|
# ===
|
|
|
|
|
|
def write_signature_prefixed(w: Writer, signature: bytes, hash_type: int) -> None:
|
|
write_bitcoin_varint(w, len(signature) + 1)
|
|
write_bytes_unchecked(w, signature)
|
|
w.append(hash_type)
|
|
|
|
|
|
def append_signature(w: Writer, signature: bytes, hash_type: int) -> None:
|
|
write_op_push(w, len(signature) + 1)
|
|
write_bytes_unchecked(w, signature)
|
|
w.append(hash_type)
|
|
|
|
|
|
def append_pubkey(w: Writer, pubkey: bytes) -> None:
|
|
write_op_push(w, len(pubkey))
|
|
write_bytes_unchecked(w, pubkey)
|