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Code Issues Releases Wiki Activity

signing/segwit: script code simplified

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This commit is contained in:
Tomas Susanka 2018-02-09 12:30:18 +01:00 committed by Jan Pochyla
parent 985c01caf4
commit 6bc0f82642
1 changed files with 11 additions and 11 deletions
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22
src/apps/wallet/sign_tx/segwit_bip143.py
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@ -3,6 +3,7 @@ from trezor.messages.SignTx import SignTx
from trezor.messages import InputScriptType, FailureType
from apps.wallet.sign_tx.writers import *
from apps.wallet.sign_tx.scripts import output_script_p2pkh
from apps.common.hash_writer import HashWriter
@ -58,22 +59,21 @@ class Bip143:
return get_tx_hash(h_preimage, True)
# this not redeemScript nor scriptPubKey
# for P2WPKH this is always 0x1976a914{20-byte-pubkey-hash}88ac
# see https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki#specification
# item 5 for details
def derive_script_code(self, txi: TxInputType, pubkeyhash: bytes) -> bytearray:
# p2wpkh in p2sh or native p2wpkh
# p2wsh multisig to be implemented
if txi.multisig:
raise Bip143Error(FailureType.DataError, 'Bip143 multisig support to be implemented')
p2pkh = (txi.script_type == InputScriptType.SPENDWITNESS or
txi.script_type == InputScriptType.SPENDP2SHWITNESS or
txi.script_type == InputScriptType.SPENDADDRESS)
if p2pkh:
s = bytearray(25)
s[0] = 0x76 # OP_DUP
s[1] = 0xA9 # OP_HASH_160
s[2] = 0x14 # pushing 20 bytes
s[3:23] = pubkeyhash
s[23] = 0x88 # OP_EQUALVERIFY
s[24] = 0xAC # OP_CHECKSIG
return s
# for p2wpkh in p2sh or native p2wpkh
# the scriptCode is a classic p2pkh
return output_script_p2pkh(pubkeyhash)
else:
raise Bip143Error(FailureType.DataError,
'Unknown input script type for bip143 script code')