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core: use utils.BufferReader instead of apps.common.BytearrayReader

Browse Source
pull/1128/head
matejcik 4 years ago committed by Tomas Susanka
parent 1ff4a0d239
commit 5e7fd3aea6
6 changed files with 31 additions and 54 deletions
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6
core/src/apps/bitcoin/ownership.py
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@ -2,7 +2,7 @@ from trezor import utils, wire
from trezor.crypto import bip32, hashlib, hmac
from apps.common import seed
from apps.common.readers import BytearrayReader, read_bitcoin_varint
from apps.common.readers import read_bitcoin_varint
from apps.common.writers import (
empty_bytearray,
write_bitcoin_varint,
@ -71,7 +71,7 @@ def verify_nonownership(
coin: CoinInfo,
) -> bool:
try:
r = BytearrayReader(proof)
r = utils.BufferReader(proof)
if r.read(4) != _VERSION_MAGIC:
raise wire.DataError("Unknown format of proof of ownership")
@ -100,7 +100,7 @@ def verify_nonownership(
# the digest and the value to use is not defined in BIP-322.
verifier = SignatureVerifier(script_pubkey, script_sig, witness, coin)
verifier.verify(sighash.digest())
except (ValueError, IndexError):
except (ValueError, EOFError):
raise wire.DataError("Invalid proof of ownership")
return not_owned

8
core/src/apps/bitcoin/readers.py
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@ -1,12 +1,14 @@
from apps.common.readers import BytearrayReader, read_bitcoin_varint
from trezor.utils import BufferReader
from apps.common.readers import read_bitcoin_varint
def read_bytes_prefixed(r: BytearrayReader) -> bytes:
def read_bytes_prefixed(r: BufferReader) -> bytes:
n = read_bitcoin_varint(r)
return r.read(n)
def read_op_push(r: BytearrayReader) -> int:
def read_op_push(r: BufferReader) -> int:
prefix = r.get()
if prefix < 0x4C:
n = prefix

26
core/src/apps/bitcoin/scripts.py
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@ -7,7 +7,7 @@ from trezor.messages.TxInputType import TxInputType
from apps.common import address_type
from apps.common.coininfo import CoinInfo
from apps.common.readers import BytearrayReader, read_bitcoin_varint
from apps.common.readers import read_bitcoin_varint
from apps.common.writers import empty_bytearray, write_bitcoin_varint
from . import common
@ -145,9 +145,9 @@ def input_script_p2pkh_or_p2sh(
return w
def parse_input_script_p2pkh(script_sig: bytes,) -> Tuple[bytes, bytes, int]:
def parse_input_script_p2pkh(script_sig: bytes) -> Tuple[bytes, bytes, int]:
try:
r = BytearrayReader(script_sig)
r = utils.BufferReader(script_sig)
n = read_op_push(r)
signature = r.read(n - 1)
hash_type = r.get()
@ -156,7 +156,7 @@ def parse_input_script_p2pkh(script_sig: bytes,) -> Tuple[bytes, bytes, int]:
pubkey = r.read()
if len(pubkey) != n:
raise ValueError
except (ValueError, IndexError):
except (ValueError, EOFError):
wire.DataError("Invalid scriptSig.")
return pubkey, signature, hash_type
@ -274,7 +274,7 @@ def witness_p2wpkh(signature: bytes, pubkey: bytes, hash_type: int) -> bytearray
def parse_witness_p2wpkh(witness: bytes) -> Tuple[bytes, bytes, int]:
try:
r = BytearrayReader(witness)
r = utils.BufferReader(witness)
if r.get() != 2:
# num of stack items, in P2WPKH it's always 2
@ -287,7 +287,7 @@ def parse_witness_p2wpkh(witness: bytes) -> Tuple[bytes, bytes, int]:
pubkey = read_bytes_prefixed(r)
if r.remaining_count():
raise ValueError
except (ValueError, IndexError):
except (ValueError, EOFError):
raise wire.DataError("Invalid witness.")
return pubkey, signature, hash_type
@ -344,7 +344,7 @@ def witness_multisig(
def parse_witness_multisig(witness: bytes) -> Tuple[bytes, List[Tuple[bytes, int]]]:
try:
r = BytearrayReader(witness)
r = utils.BufferReader(witness)
# Get number of witness stack items.
item_count = read_bitcoin_varint(r)
@ -363,7 +363,7 @@ def parse_witness_multisig(witness: bytes) -> Tuple[bytes, List[Tuple[bytes, int
script = read_bytes_prefixed(r)
if r.remaining_count():
raise ValueError
except (ValueError, IndexError):
except (ValueError, EOFError):
raise wire.DataError("Invalid witness.")
return script, signatures
@ -422,7 +422,7 @@ def parse_input_script_multisig(
script_sig: bytes,
) -> Tuple[bytes, List[Tuple[bytes, int]]]:
try:
r = BytearrayReader(script_sig)
r = utils.BufferReader(script_sig)
# Skip over OP_FALSE, which is due to the old OP_CHECKMULTISIG bug.
if r.get() != 0:
@ -439,7 +439,7 @@ def parse_input_script_multisig(
script = r.read()
if len(script) != n:
raise ValueError
except (ValueError, IndexError):
except (ValueError, EOFError):
raise wire.DataError("Invalid scriptSig.")
return script, signatures
@ -472,7 +472,7 @@ def output_script_multisig_length(pubkeys: List[bytes], m: int) -> int:
def parse_output_script_multisig(script: bytes) -> Tuple[List[bytes], int]:
try:
r = BytearrayReader(script)
r = utils.BufferReader(script)
threshold = r.get() - 0x50
pubkey_count = script[-2] - 0x50
@ -497,7 +497,7 @@ def parse_output_script_multisig(script: bytes) -> Tuple[List[bytes], int]:
if r.remaining_count():
raise ValueError
except (ValueError, IndexError):
except (ValueError, IndexError, EOFError):
raise wire.DataError("Invalid multisig script")
return public_keys, threshold
@ -548,7 +548,7 @@ def write_bip322_signature_proof(
w.extend(witness)
def read_bip322_signature_proof(r: BytearrayReader) -> Tuple[bytes, bytes]:
def read_bip322_signature_proof(r: utils.BufferReader) -> Tuple[bytes, bytes]:
script_sig = read_bytes_prefixed(r)
witness = r.read()
return script_sig, witness

33
core/src/apps/common/readers.py
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@ -1,36 +1,7 @@
if False:
from typing import Optional
from trezor.utils import BufferReader
class BytearrayReader:
def __init__(self, data: bytes):
self.data = data
self.offset = 0
def get(self) -> int:
ret = self.data[self.offset]
self.offset += 1
return ret
def peek(self) -> int:
return self.data[self.offset]
def read(self, i: Optional[int] = None) -> bytes:
if i is None:
ret = self.data[self.offset :]
self.offset = len(self.data)
elif 0 <= i <= len(self.data) - self.offset:
ret = self.data[self.offset : self.offset + i]
self.offset += i
else:
raise IndexError
return ret
def remaining_count(self) -> int:
return len(self.data) - self.offset
def read_bitcoin_varint(r: BytearrayReader) -> int:
def read_bitcoin_varint(r: BufferReader) -> int:
prefix = r.get()
if prefix < 253:
n = prefix

8
core/src/trezor/crypto/der.py
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@ -1,4 +1,4 @@
from apps.common.readers import BytearrayReader
from trezor.utils import BufferReader
if False:
from typing import List
@ -15,7 +15,7 @@ def encode_length(l: int) -> bytes:
raise ValueError
def decode_length(r: BytearrayReader) -> int:
def decode_length(r: BufferReader) -> int:
init = r.get()
if init < 0x80:
# short form encodes length in initial octet
@ -45,7 +45,7 @@ def encode_int(i: bytes) -> bytes:
return b"\x02" + encode_length(len(i)) + i
def decode_int(r: BytearrayReader) -> bytes:
def decode_int(r: BufferReader) -> bytes:
if r.get() != 0x02:
raise ValueError
@ -76,7 +76,7 @@ def encode_seq(seq: tuple) -> bytes:
def decode_seq(data: bytes) -> List[bytes]:
r = BytearrayReader(data)
r = BufferReader(data)
if r.get() != 0x30:
raise ValueError

4
core/src/trezor/utils.py
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@ -208,10 +208,14 @@ class BufferReader:
def peek(self) -> int:
"""Peek the ordinal value of the next byte to be read."""
if self.offset >= len(self.buffer):
raise EOFError
return self.buffer[self.offset]
def get(self) -> int:
"""Read exactly one byte and return its ordinal value."""
if self.offset >= len(self.buffer):
raise EOFError
byte = self.buffer[self.offset]
self.offset += 1
return byte

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