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core/sign_tx: remove write_bytes_unchecked where appropriate

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release/2020-04
matejcik 4 years ago committed by Tomas Susanka
parent 27f6306e1d
commit 9cab61fbd3
6 changed files with 79 additions and 52 deletions
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6
core/src/apps/wallet/sign_tx/multisig.py
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@ -5,7 +5,7 @@ from trezor.messages.HDNodeType import HDNodeType
from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
from trezor.utils import HashWriter, ensure
from apps.wallet.sign_tx.writers import write_bytes_unchecked, write_uint32
from apps.wallet.sign_tx.writers import write_bytes_fixed, write_uint32
class MultisigError(ValueError):
@ -59,8 +59,8 @@ def multisig_fingerprint(multisig: MultisigRedeemScriptType) -> bytes:
write_uint32(h, d.depth)
write_uint32(h, d.fingerprint)
write_uint32(h, d.child_num)
write_bytes_unchecked(h, d.chain_code)
write_bytes_unchecked(h, d.public_key)
write_bytes_fixed(h, d.chain_code, 32)
write_bytes_fixed(h, d.public_key, 33)
return h.get_digest()

20
core/src/apps/wallet/sign_tx/scripts.py
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@ -4,7 +4,12 @@ from trezor.messages.MultisigRedeemScriptType import MultisigRedeemScriptType
from apps.common.coininfo import CoinInfo
from apps.common.writers import empty_bytearray
from apps.wallet.sign_tx.multisig import multisig_get_pubkey_count, multisig_get_pubkeys
from apps.wallet.sign_tx.writers import write_bytes_unchecked, write_op_push, write_varint
from apps.wallet.sign_tx.writers import (
write_bytes_fixed,
write_bytes_unchecked,
write_op_push,
write_varint,
)
class ScriptsError(ValueError):
@ -69,12 +74,13 @@ def output_script_native_p2wpkh_or_p2wsh(witprog: bytes) -> bytearray:
# Either:
# 00 14 <20-byte-key-hash>
# 00 20 <32-byte-script-hash>
utils.ensure(len(witprog) == 20 or len(witprog) == 32)
length = len(witprog)
utils.ensure(length == 20 or length == 32)
w = empty_bytearray(3 + len(witprog))
w = empty_bytearray(3 + length)
w.append(0x00) # witness version byte
w.append(len(witprog)) # pub key hash length is 20 (P2WPKH) or 32 (P2WSH) bytes
write_bytes_unchecked(w, witprog) # pub key hash
w.append(length) # pub key hash length is 20 (P2WPKH) or 32 (P2WSH) bytes
write_bytes_fixed(w, witprog, length) # pub key hash
return w
@ -95,7 +101,7 @@ def input_script_p2wpkh_in_p2sh(pubkeyhash: bytes) -> bytearray:
w.append(0x16) # length of the data
w.append(0x00) # witness version byte
w.append(0x14) # P2WPKH witness program (pub key hash length)
write_bytes_unchecked(w, pubkeyhash) # pub key hash
write_bytes_fixed(w, pubkeyhash, 20) # pub key hash
return w
@ -118,7 +124,7 @@ def input_script_p2wsh_in_p2sh(script_hash: bytes) -> bytearray:
w.append(0x22) # length of the data
w.append(0x00) # witness version byte
w.append(0x20) # P2WSH witness program (redeem script hash length)
write_bytes_unchecked(w, script_hash)
write_bytes_fixed(w, script_hash, 32)
return w

21
core/src/apps/wallet/sign_tx/segwit_bip143.py
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@ -9,13 +9,14 @@ from apps.common.coininfo import CoinInfo
from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
from apps.wallet.sign_tx.scripts import output_script_multisig, output_script_p2pkh
from apps.wallet.sign_tx.writers import (
TX_HASH_SIZE,
get_tx_hash,
write_bytes_unchecked,
write_bytes_fixed,
write_bytes_prefixed,
write_bytes_reversed,
write_tx_output,
write_uint32,
write_uint64,
write_varint,
)
@ -30,7 +31,7 @@ class Bip143:
self.h_outputs = HashWriter(sha256())
def add_prevouts(self, txi: TxInputType):
write_bytes_reversed(self.h_prevouts, txi.prev_hash)
write_bytes_reversed(self.h_prevouts, txi.prev_hash, TX_HASH_SIZE)
write_uint32(self.h_prevouts, txi.prev_index)
def add_sequence(self, txi: TxInputType):
@ -61,19 +62,21 @@ class Bip143:
ensure(not coin.overwintered)
write_uint32(h_preimage, tx.version) # nVersion
write_bytes_unchecked(h_preimage, self.get_prevouts_hash(coin)) # hashPrevouts
write_bytes_unchecked(h_preimage, self.get_sequence_hash(coin)) # hashSequence
# hashPrevouts
write_bytes_fixed(h_preimage, self.get_prevouts_hash(coin), TX_HASH_SIZE)
# hashSequence
write_bytes_fixed(h_preimage, self.get_sequence_hash(coin), TX_HASH_SIZE)
write_bytes_reversed(h_preimage, txi.prev_hash) # outpoint
write_bytes_reversed(h_preimage, txi.prev_hash, TX_HASH_SIZE) # outpoint
write_uint32(h_preimage, txi.prev_index) # outpoint
script_code = self.derive_script_code(txi, pubkeyhash) # scriptCode
write_varint(h_preimage, len(script_code))
write_bytes_unchecked(h_preimage, script_code)
write_bytes_prefixed(h_preimage, script_code)
write_uint64(h_preimage, txi.amount) # amount
write_uint32(h_preimage, txi.sequence) # nSequence
write_bytes_unchecked(h_preimage, self.get_outputs_hash(coin)) # hashOutputs
# hashOutputs
write_bytes_fixed(h_preimage, self.get_outputs_hash(coin), TX_HASH_SIZE)
write_uint32(h_preimage, tx.lock_time) # nLockTime
write_uint32(h_preimage, sighash) # nHashType

7
core/src/apps/wallet/sign_tx/signing.py
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@ -366,8 +366,7 @@ async def sign_tx(tx: SignTx, keychain: seed.Keychain):
for ii in range(tx.inputs_count):
if ii == i_sign:
writers.write_varint(h_witness, len(prev_pkscript))
writers.write_bytes_unchecked(h_witness, prev_pkscript)
writers.write_bytes_prefixed(h_witness, prev_pkscript)
else:
writers.write_varint(h_witness, 0)
@ -377,8 +376,8 @@ async def sign_tx(tx: SignTx, keychain: seed.Keychain):
h_sign = utils.HashWriter(blake256())
writers.write_uint32(h_sign, decred.DECRED_SIGHASHALL)
writers.write_bytes_unchecked(h_sign, prefix_hash)
writers.write_bytes_unchecked(h_sign, witness_hash)
writers.write_bytes_fixed(h_sign, prefix_hash, writers.TX_HASH_SIZE)
writers.write_bytes_fixed(h_sign, witness_hash, writers.TX_HASH_SIZE)
sig_hash = writers.get_tx_hash(h_sign, double=coin.sign_hash_double)
signature = ecdsa_sign(key_sign, sig_hash)

30
core/src/apps/wallet/sign_tx/writers.py
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@ -1,3 +1,5 @@
from micropython import const
from trezor.crypto.hashlib import sha256
from trezor.messages.TxInputType import TxInputType
from trezor.messages.TxOutputBinType import TxOutputBinType
@ -5,29 +7,39 @@ from trezor.utils import ensure
from apps.common.writers import ( # noqa: F401
empty_bytearray,
write_bytes_unchecked,
write_bytes_fixed,
write_bytes_reversed,
write_bytes_unchecked,
write_uint8,
write_uint16_le,
write_uint32_le,
write_uint64_le,
)
if False:
from apps.common.writers import Writer
write_uint16 = write_uint16_le
write_uint32 = write_uint32_le
write_uint64 = write_uint64_le
TX_HASH_SIZE = const(32)
def write_bytes_prefixed(w: Writer, b: bytes) -> None:
write_varint(w, len(b))
write_bytes_unchecked(w, b)
def write_tx_input(w, i: TxInputType):
write_bytes_reversed(w, i.prev_hash)
write_bytes_reversed(w, i.prev_hash, TX_HASH_SIZE)
write_uint32(w, i.prev_index)
write_varint(w, len(i.script_sig))
write_bytes_unchecked(w, i.script_sig)
write_bytes_prefixed(w, i.script_sig)
write_uint32(w, i.sequence)
def write_tx_input_check(w, i: TxInputType):
write_bytes_unchecked(w, i.prev_hash)
write_bytes_fixed(w, i.prev_hash, TX_HASH_SIZE)
write_uint32(w, i.prev_index)
write_uint32(w, i.script_type)
write_uint32(w, len(i.address_n))
@ -38,7 +50,7 @@ def write_tx_input_check(w, i: TxInputType):
def write_tx_input_decred(w, i: TxInputType):
write_bytes_reversed(w, i.prev_hash)
write_bytes_reversed(w, i.prev_hash, TX_HASH_SIZE)
write_uint32(w, i.prev_index or 0)
write_uint8(w, i.decred_tree or 0)
write_uint32(w, i.sequence)
@ -48,16 +60,14 @@ def write_tx_input_decred_witness(w, i: TxInputType):
write_uint64(w, i.amount or 0)
write_uint32(w, 0) # block height fraud proof
write_uint32(w, 0xFFFFFFFF) # block index fraud proof
write_varint(w, len(i.script_sig))
write_bytes_unchecked(w, i.script_sig)
write_bytes_prefixed(w, i.script_sig)
def write_tx_output(w, o: TxOutputBinType):
write_uint64(w, o.amount)
if o.decred_script_version is not None:
write_uint16(w, o.decred_script_version)
write_varint(w, len(o.script_pubkey))
write_bytes_unchecked(w, o.script_pubkey)
write_bytes_prefixed(w, o.script_pubkey)
def write_op_push(w, n: int):

47
core/src/apps/wallet/sign_tx/zcash.py
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@ -12,13 +12,14 @@ from apps.common.coininfo import CoinInfo
from apps.wallet.sign_tx.multisig import multisig_get_pubkeys
from apps.wallet.sign_tx.scripts import output_script_multisig, output_script_p2pkh
from apps.wallet.sign_tx.writers import (
TX_HASH_SIZE,
get_tx_hash,
write_bytes_unchecked,
write_bytes_fixed,
write_bytes_prefixed,
write_bytes_reversed,
write_tx_output,
write_uint32,
write_uint64,
write_varint,
)
OVERWINTERED = const(0x80000000)
@ -53,7 +54,7 @@ class Zip143:
self.h_outputs = HashWriter(blake2b(outlen=32, personal=b"ZcashOutputsHash"))
def add_prevouts(self, txi: TxInputType):
write_bytes_reversed(self.h_prevouts, txi.prev_hash)
write_bytes_reversed(self.h_prevouts, txi.prev_hash, TX_HASH_SIZE)
write_uint32(self.h_prevouts, txi.prev_index)
def add_sequence(self, txi: TxInputType):
@ -92,20 +93,23 @@ class Zip143:
h_preimage, tx.version | OVERWINTERED
) # 1. nVersion | fOverwintered
write_uint32(h_preimage, tx.version_group_id) # 2. nVersionGroupId
write_bytes_unchecked(h_preimage, bytearray(self.get_prevouts_hash())) # 3. hashPrevouts
write_bytes_unchecked(h_preimage, bytearray(self.get_sequence_hash())) # 4. hashSequence
write_bytes_unchecked(h_preimage, bytearray(self.get_outputs_hash())) # 5. hashOutputs
write_bytes_unchecked(h_preimage, b"\x00" * 32) # 6. hashJoinSplits
# 3. hashPrevouts
write_bytes_fixed(h_preimage, bytearray(self.get_prevouts_hash()), TX_HASH_SIZE)
# 4. hashSequence
write_bytes_fixed(h_preimage, bytearray(self.get_sequence_hash()), TX_HASH_SIZE)
# 5. hashOutputs
write_bytes_fixed(h_preimage, bytearray(self.get_outputs_hash()), TX_HASH_SIZE)
# 6. hashJoinSplits
write_bytes_fixed(h_preimage, b"\x00" * TX_HASH_SIZE, TX_HASH_SIZE)
write_uint32(h_preimage, tx.lock_time) # 7. nLockTime
write_uint32(h_preimage, tx.expiry) # 8. expiryHeight
write_uint32(h_preimage, sighash) # 9. nHashType
write_bytes_reversed(h_preimage, txi.prev_hash) # 10a. outpoint
write_bytes_reversed(h_preimage, txi.prev_hash, TX_HASH_SIZE) # 10a. outpoint
write_uint32(h_preimage, txi.prev_index)
script_code = derive_script_code(txi, pubkeyhash) # 10b. scriptCode
write_varint(h_preimage, len(script_code))
write_bytes_unchecked(h_preimage, script_code)
write_bytes_prefixed(h_preimage, script_code)
write_uint64(h_preimage, txi.amount) # 10c. value
@ -139,23 +143,28 @@ class Zip243(Zip143):
h_preimage, tx.version | OVERWINTERED
) # 1. nVersion | fOverwintered
write_uint32(h_preimage, tx.version_group_id) # 2. nVersionGroupId
write_bytes_unchecked(h_preimage, bytearray(self.get_prevouts_hash())) # 3. hashPrevouts
write_bytes_unchecked(h_preimage, bytearray(self.get_sequence_hash())) # 4. hashSequence
write_bytes_unchecked(h_preimage, bytearray(self.get_outputs_hash())) # 5. hashOutputs
write_bytes_unchecked(h_preimage, b"\x00" * 32) # 6. hashJoinSplits
write_bytes_unchecked(h_preimage, b"\x00" * 32) # 7. hashShieldedSpends
write_bytes_unchecked(h_preimage, b"\x00" * 32) # 8. hashShieldedOutputs
# 3. hashPrevouts
write_bytes_fixed(h_preimage, bytearray(self.get_prevouts_hash()), TX_HASH_SIZE)
# 4. hashSequence
write_bytes_fixed(h_preimage, bytearray(self.get_sequence_hash()), TX_HASH_SIZE)
# 5. hashOutputs
write_bytes_fixed(h_preimage, bytearray(self.get_outputs_hash()), TX_HASH_SIZE)
zero_hash = b"\x00" * TX_HASH_SIZE
write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE) # 6. hashJoinSplits
write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE) # 7. hashShieldedSpends
write_bytes_fixed(h_preimage, zero_hash, TX_HASH_SIZE) # 8. hashShieldedOutputs
write_uint32(h_preimage, tx.lock_time) # 9. nLockTime
write_uint32(h_preimage, tx.expiry) # 10. expiryHeight
write_uint64(h_preimage, 0) # 11. valueBalance
write_uint32(h_preimage, sighash) # 12. nHashType
write_bytes_reversed(h_preimage, txi.prev_hash) # 13a. outpoint
write_bytes_reversed(h_preimage, txi.prev_hash, TX_HASH_SIZE) # 13a. outpoint
write_uint32(h_preimage, txi.prev_index)
script_code = derive_script_code(txi, pubkeyhash) # 13b. scriptCode
write_varint(h_preimage, len(script_code))
write_bytes_unchecked(h_preimage, script_code)
write_bytes_prefixed(h_preimage, script_code)
write_uint64(h_preimage, txi.amount) # 13c. value

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