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#!/usr/bin/env python3
# Copyright (c) 2015-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test decoding scripts via decodescript RPC command."""
import json
import os
from test_framework.messages import (
sha256,
tx_from_hex,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
)
class DecodeScriptTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
def decodescript_script_sig(self):
signature = '304502207fa7a6d1e0ee81132a269ad84e68d695483745cde8b541e3bf630749894e342a022100c1f7ab20e13e22fb95281a870f3dcf38d782e53023ee313d741ad0cfbc0c509001'
push_signature = '48' + signature
public_key = '03b0da749730dc9b4b1f4a14d6902877a92541f5368778853d9c4a0cb7802dcfb2'
push_public_key = '21' + public_key
# below are test cases for all of the standard transaction types
self.log.info("- P2PK")
# the scriptSig of a public key scriptPubKey simply pushes a signature onto the stack
rpc_result = self.nodes[0].decodescript(push_signature)
assert_equal(signature, rpc_result['asm'])
self.log.info("- P2PKH")
rpc_result = self.nodes[0].decodescript(push_signature + push_public_key)
assert_equal(signature + ' ' + public_key, rpc_result['asm'])
self.log.info("- multisig")
# this also tests the leading portion of a P2SH multisig scriptSig
# OP_0 <A sig> <B sig>
rpc_result = self.nodes[0].decodescript('00' + push_signature + push_signature)
assert_equal('0 ' + signature + ' ' + signature, rpc_result['asm'])
self.log.info("- P2SH")
# an empty P2SH redeemScript is valid and makes for a very simple test case.
# thus, such a spending scriptSig would just need to pass the outer redeemScript
# hash test and leave true on the top of the stack.
rpc_result = self.nodes[0].decodescript('5100')
assert_equal('1 0', rpc_result['asm'])
# null data scriptSig - no such thing because null data scripts cannot be spent.
# thus, no test case for that standard transaction type is here.
def decodescript_script_pub_key(self):
public_key = '03b0da749730dc9b4b1f4a14d6902877a92541f5368778853d9c4a0cb7802dcfb2'
push_public_key = '21' + public_key
public_key_hash = '5dd1d3a048119c27b28293056724d9522f26d945'
push_public_key_hash = '14' + public_key_hash
uncompressed_public_key = '04b0da749730dc9b4b1f4a14d6902877a92541f5368778853d9c4a0cb7802dcfb25e01fc8fde47c96c98a4f3a8123e33a38a50cf9025cc8c4494a518f991792bb7'
push_uncompressed_public_key = '41' + uncompressed_public_key
p2wsh_p2pk_script_hash = 'd8590cf8ea0674cf3d49fd7ca249b85ef7485dea62c138468bddeb20cd6519f7'
# below are test cases for all of the standard transaction types
self.log.info("- P2PK")
# <pubkey> OP_CHECKSIG
rpc_result = self.nodes[0].decodescript(push_public_key + 'ac')
assert_equal(public_key + ' OP_CHECKSIG', rpc_result['asm'])
assert_equal('pubkey', rpc_result['type'])
# P2PK is translated to P2WPKH
assert_equal('0 ' + public_key_hash, rpc_result['segwit']['asm'])
self.log.info("- P2PKH")
# OP_DUP OP_HASH160 <PubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
rpc_result = self.nodes[0].decodescript('76a9' + push_public_key_hash + '88ac')
assert_equal('pubkeyhash', rpc_result['type'])
assert_equal('OP_DUP OP_HASH160 ' + public_key_hash + ' OP_EQUALVERIFY OP_CHECKSIG', rpc_result['asm'])
# P2PKH is translated to P2WPKH
assert_equal('witness_v0_keyhash', rpc_result['segwit']['type'])
assert_equal('0 ' + public_key_hash, rpc_result['segwit']['asm'])
self.log.info("- multisig")
# <m> <A pubkey> <B pubkey> <C pubkey> <n> OP_CHECKMULTISIG
# just imagine that the pub keys used below are different.
# for our purposes here it does not matter that they are the same even though it is unrealistic.
multisig_script = '52' + push_public_key + push_public_key + push_public_key + '53ae'
rpc_result = self.nodes[0].decodescript(multisig_script)
assert_equal('multisig', rpc_result['type'])
assert_equal('2 ' + public_key + ' ' + public_key + ' ' + public_key + ' 3 OP_CHECKMULTISIG', rpc_result['asm'])
# multisig in P2WSH
multisig_script_hash = sha256(bytes.fromhex(multisig_script)).hex()
assert_equal('witness_v0_scripthash', rpc_result['segwit']['type'])
assert_equal('0 ' + multisig_script_hash, rpc_result['segwit']['asm'])
self.log.info ("- P2SH")
# OP_HASH160 <Hash160(redeemScript)> OP_EQUAL.
# push_public_key_hash here should actually be the hash of a redeem script.
# but this works the same for purposes of this test.
rpc_result = self.nodes[0].decodescript('a9' + push_public_key_hash + '87')
assert_equal('scripthash', rpc_result['type'])
assert_equal('OP_HASH160 ' + public_key_hash + ' OP_EQUAL', rpc_result['asm'])
# P2SH does not work in segwit secripts. decodescript should not return a result for it.
assert 'segwit' not in rpc_result
self.log.info("- null data")
# use a signature look-alike here to make sure that we do not decode random data as a signature.
# this matters if/when signature sighash decoding comes along.
# would want to make sure that no such decoding takes place in this case.
signature_imposter = '48304502207fa7a6d1e0ee81132a269ad84e68d695483745cde8b541e3bf630749894e342a022100c1f7ab20e13e22fb95281a870f3dcf38d782e53023ee313d741ad0cfbc0c509001'
# OP_RETURN <data>
rpc_result = self.nodes[0].decodescript('6a' + signature_imposter)
assert_equal('nulldata', rpc_result['type'])
assert_equal('OP_RETURN ' + signature_imposter[2:], rpc_result['asm'])
self.log.info("- CLTV redeem script")
# redeem scripts are in-effect scriptPubKey scripts, so adding a test here.
# OP_NOP2 is also known as OP_CHECKLOCKTIMEVERIFY.
# just imagine that the pub keys used below are different.
# for our purposes here it does not matter that they are the same even though it is unrealistic.
#
# OP_IF
# <receiver-pubkey> OP_CHECKSIGVERIFY
# OP_ELSE
# <lock-until> OP_CHECKLOCKTIMEVERIFY OP_DROP
# OP_ENDIF
# <sender-pubkey> OP_CHECKSIG
#
# lock until block 500,000
cltv_script = '63' + push_public_key + 'ad670320a107b17568' + push_public_key + 'ac'
rpc_result = self.nodes[0].decodescript(cltv_script)
assert_equal('nonstandard', rpc_result['type'])
assert_equal('OP_IF ' + public_key + ' OP_CHECKSIGVERIFY OP_ELSE 500000 OP_CHECKLOCKTIMEVERIFY OP_DROP OP_ENDIF ' + public_key + ' OP_CHECKSIG', rpc_result['asm'])
# CLTV script in P2WSH
cltv_script_hash = sha256(bytes.fromhex(cltv_script)).hex()
assert_equal('0 ' + cltv_script_hash, rpc_result['segwit']['asm'])
self.log.info("- P2PK with uncompressed pubkey")
# <pubkey> OP_CHECKSIG
rpc_result = self.nodes[0].decodescript(push_uncompressed_public_key + 'ac')
assert_equal('pubkey', rpc_result['type'])
assert_equal(uncompressed_public_key + ' OP_CHECKSIG', rpc_result['asm'])
# uncompressed pubkeys are invalid for checksigs in segwit scripts.
# decodescript should not return a P2WPKH equivalent.
assert 'segwit' not in rpc_result
self.log.info("- multisig with uncompressed pubkey")
# <m> <A pubkey> <B pubkey> <n> OP_CHECKMULTISIG
# just imagine that the pub keys used below are different.
# the purpose of this test is to check that a segwit script is not returned for bare multisig scripts
# with an uncompressed pubkey in them.
rpc_result = self.nodes[0].decodescript('52' + push_public_key + push_uncompressed_public_key +'52ae')
assert_equal('multisig', rpc_result['type'])
assert_equal('2 ' + public_key + ' ' + uncompressed_public_key + ' 2 OP_CHECKMULTISIG', rpc_result['asm'])
# uncompressed pubkeys are invalid for checksigs in segwit scripts.
# decodescript should not return a P2WPKH equivalent.
assert 'segwit' not in rpc_result
self.log.info("- P2WPKH")
# 0 <PubKeyHash>
rpc_result = self.nodes[0].decodescript('00' + push_public_key_hash)
assert_equal('witness_v0_keyhash', rpc_result['type'])
assert_equal('0 ' + public_key_hash, rpc_result['asm'])
# segwit scripts do not work nested into each other.
# a nested segwit script should not be returned in the results.
assert 'segwit' not in rpc_result
self.log.info("- P2WSH")
# 0 <ScriptHash>
# even though this hash is of a P2PK script which is better used as bare P2WPKH, it should not matter
# for the purpose of this test.
rpc_result = self.nodes[0].decodescript('0020' + p2wsh_p2pk_script_hash)
assert_equal('witness_v0_scripthash', rpc_result['type'])
assert_equal('0 ' + p2wsh_p2pk_script_hash, rpc_result['asm'])
# segwit scripts do not work nested into each other.
# a nested segwit script should not be returned in the results.
assert 'segwit' not in rpc_result
self.log.info("- P2TR")
# 1 <x-only pubkey>
xonly_public_key = '01'*32 # first ever P2TR output on mainnet
rpc_result = self.nodes[0].decodescript('5120' + xonly_public_key)
assert_equal('witness_v1_taproot', rpc_result['type'])
assert_equal('1 ' + xonly_public_key, rpc_result['asm'])
assert 'segwit' not in rpc_result
def decoderawtransaction_asm_sighashtype(self):
"""Test decoding scripts via RPC command "decoderawtransaction".
This test is in with the "decodescript" tests because they are testing the same "asm" script decodes.
"""
self.log.info("- various mainnet txs")
# this test case uses a mainnet transaction that has a P2SH input and both P2PKH and P2SH outputs.
tx = '0100000001696a20784a2c70143f634e95227dbdfdf0ecd51647052e70854512235f5986ca010000008a47304402207174775824bec6c2700023309a168231ec80b82c6069282f5133e6f11cbb04460220570edc55c7c5da2ca687ebd0372d3546ebc3f810516a002350cac72dfe192dfb014104d3f898e6487787910a690410b7a917ef198905c27fb9d3b0a42da12aceae0544fc7088d239d9a48f2828a15a09e84043001f27cc80d162cb95404e1210161536ffffffff0100e1f505000000001976a914eb6c6e0cdb2d256a32d97b8df1fc75d1920d9bca88ac00000000'
rpc_result = self.nodes[0].decoderawtransaction(tx)
assert_equal('304402207174775824bec6c2700023309a168231ec80b82c6069282f5133e6f11cbb04460220570edc55c7c5da2ca687ebd0372d3546ebc3f810516a002350cac72dfe192dfb[ALL] 04d3f898e6487787910a690410b7a917ef198905c27fb9d3b0a42da12aceae0544fc7088d239d9a48f2828a15a09e84043001f27cc80d162cb95404e1210161536', rpc_result['vin'][0]['scriptSig']['asm'])
# this test case uses a mainnet transaction that has a P2SH input and both P2PKH and P2SH outputs.
# it's from James D'Angelo's awesome introductory videos about multisig: https://www.youtube.com/watch?v=zIbUSaZBJgU and https://www.youtube.com/watch?v=OSA1pwlaypc
# verify that we have not altered scriptPubKey decoding.
tx = '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'
rpc_result = self.nodes[0].decoderawtransaction(tx)
assert_equal('8e3730608c3b0bb5df54f09076e196bc292a8e39a78e73b44b6ba08c78f5cbb0', rpc_result['txid'])
assert_equal('0 3045022100ae3b4e589dfc9d48cb82d41008dc5fa6a86f94d5c54f9935531924602730ab8002202f88cf464414c4ed9fa11b773c5ee944f66e9b05cc1e51d97abc22ce098937ea[ALL] 3045022100b44883be035600e9328a01b66c7d8439b74db64187e76b99a68f7893b701d5380220225bf286493e4c4adcf928c40f785422572eb232f84a0b83b0dea823c3a19c75[ALL] 5221020743d44be989540d27b1b4bbbcfd17721c337cb6bc9af20eb8a32520b393532f2102c0120a1dda9e51a938d39ddd9fe0ebc45ea97e1d27a7cbd671d5431416d3dd87210213820eb3d5f509d7438c9eeecb4157b2f595105e7cd564b3cdbb9ead3da41eed53ae', rpc_result['vin'][0]['scriptSig']['asm'])
assert_equal('OP_DUP OP_HASH160 dc863734a218bfe83ef770ee9d41a27f824a6e56 OP_EQUALVERIFY OP_CHECKSIG', rpc_result['vout'][0]['scriptPubKey']['asm'])
assert_equal('OP_HASH160 2a5edea39971049a540474c6a99edf0aa4074c58 OP_EQUAL', rpc_result['vout'][1]['scriptPubKey']['asm'])
txSave = tx_from_hex(tx)
self.log.info("- tx not passing DER signature checks")
# make sure that a specifically crafted op_return value will not pass all the IsDERSignature checks and then get decoded as a sighash type
tx = '01000000015ded05872fdbda629c7d3d02b194763ce3b9b1535ea884e3c8e765d42e316724020000006b48304502204c10d4064885c42638cbff3585915b322de33762598321145ba033fc796971e2022100bb153ad3baa8b757e30a2175bd32852d2e1cb9080f84d7e32fcdfd667934ef1b012103163c0ff73511ea1743fb5b98384a2ff09dd06949488028fd819f4d83f56264efffffffff0200000000000000000b6a0930060201000201000180380100000000001976a9141cabd296e753837c086da7a45a6c2fe0d49d7b7b88ac00000000'
rpc_result = self.nodes[0].decoderawtransaction(tx)
assert_equal('OP_RETURN 300602010002010001', rpc_result['vout'][0]['scriptPubKey']['asm'])
self.log.info("- tx passing DER signature checks")
# verify that we have not altered scriptPubKey processing even of a specially crafted P2PKH pubkeyhash and P2SH redeem script hash that is made to pass the der signature checks
tx = '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'
rpc_result = self.nodes[0].decoderawtransaction(tx)
assert_equal('OP_DUP OP_HASH160 3011020701010101010101020601010101010101 OP_EQUALVERIFY OP_CHECKSIG', rpc_result['vout'][0]['scriptPubKey']['asm'])
assert_equal('OP_HASH160 3011020701010101010101020601010101010101 OP_EQUAL', rpc_result['vout'][1]['scriptPubKey']['asm'])
# some more full transaction tests of varying specific scriptSigs. used instead of
# tests in decodescript_script_sig because the decodescript RPC is specifically
# for working on scriptPubKeys (argh!).
push_signature = txSave.vin[0].scriptSig.hex()[2:(0x48*2+4)]
signature = push_signature[2:]
der_signature = signature[:-2]
signature_sighash_decoded = der_signature + '[ALL]'
signature_2 = der_signature + '82'
push_signature_2 = '48' + signature_2
signature_2_sighash_decoded = der_signature + '[NONE|ANYONECANPAY]'
self.log.info("- P2PK scriptSig")
txSave.vin[0].scriptSig = bytes.fromhex(push_signature)
rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
assert_equal(signature_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
# make sure that the sighash decodes come out correctly for a more complex / lesser used case.
txSave.vin[0].scriptSig = bytes.fromhex(push_signature_2)
rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
assert_equal(signature_2_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
self.log.info("- multisig scriptSig")
txSave.vin[0].scriptSig = bytes.fromhex('00' + push_signature + push_signature_2)
rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
assert_equal('0 ' + signature_sighash_decoded + ' ' + signature_2_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
self.log.info("- scriptSig that contains more than push operations")
# in fact, it contains an OP_RETURN with data specially crafted to cause improper decode if the code does not catch it.
txSave.vin[0].scriptSig = bytes.fromhex('6a143011020701010101010101020601010101010101')
rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
assert_equal('OP_RETURN 3011020701010101010101020601010101010101', rpc_result['vin'][0]['scriptSig']['asm'])
def decodescript_datadriven_tests(self):
with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/rpc_decodescript.json'), encoding='utf-8') as f:
dd_tests = json.load(f)
for script, result in dd_tests:
rpc_result = self.nodes[0].decodescript(script)
assert_equal(result, rpc_result)
def run_test(self):
self.log.info("Test decoding of standard input scripts [scriptSig]")
self.decodescript_script_sig()
self.log.info("Test decoding of standard output scripts [scriptPubKey]")
self.decodescript_script_pub_key()
self.log.info("Test 'asm' script decoding of transactions")
self.decoderawtransaction_asm_sighashtype()
self.log.info("Data-driven tests")
self.decodescript_datadriven_tests()
if __name__ == '__main__':
DecodeScriptTest().main()
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