mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-27 01:48:17 +00:00
268 lines
6.8 KiB
Python
268 lines
6.8 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import functools
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import hashlib
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import re
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import struct
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import unicodedata
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from typing import List, NewType
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from .coins import slip44
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from .exceptions import TrezorFailure
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CallException = TrezorFailure
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HARDENED_FLAG = 1 << 31
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Address = NewType("Address", List[int])
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def H_(x: int) -> int:
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"""
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Shortcut function that "hardens" a number in a BIP44 path.
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"""
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return x | HARDENED_FLAG
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def btc_hash(data):
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"""
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Double-SHA256 hash as used in BTC
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"""
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return hashlib.sha256(hashlib.sha256(data).digest()).digest()
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def hash_160(public_key):
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md = hashlib.new("ripemd160")
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md.update(hashlib.sha256(public_key).digest())
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return md.digest()
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def hash_160_to_bc_address(h160, address_type):
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vh160 = struct.pack("<B", address_type) + h160
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h = btc_hash(vh160)
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addr = vh160 + h[0:4]
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return b58encode(addr)
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def compress_pubkey(public_key):
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if public_key[0] == 4:
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return bytes((public_key[64] & 1) + 2) + public_key[1:33]
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raise ValueError("Pubkey is already compressed")
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def public_key_to_bc_address(public_key, address_type, compress=True):
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if public_key[0] == "\x04" and compress:
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public_key = compress_pubkey(public_key)
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h160 = hash_160(public_key)
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return hash_160_to_bc_address(h160, address_type)
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__b58chars = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
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__b58base = len(__b58chars)
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def b58encode(v):
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""" encode v, which is a string of bytes, to base58."""
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long_value = 0
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for c in v:
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long_value = long_value * 256 + c
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result = ""
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while long_value >= __b58base:
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div, mod = divmod(long_value, __b58base)
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result = __b58chars[mod] + result
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long_value = div
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result = __b58chars[long_value] + result
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# Bitcoin does a little leading-zero-compression:
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# leading 0-bytes in the input become leading-1s
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nPad = 0
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for c in v:
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if c == 0:
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nPad += 1
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else:
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break
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return (__b58chars[0] * nPad) + result
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def b58decode(v, length=None):
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""" decode v into a string of len bytes."""
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if isinstance(v, bytes):
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v = v.decode()
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long_value = 0
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for (i, c) in enumerate(v[::-1]):
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long_value += __b58chars.find(c) * (__b58base ** i)
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result = b""
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while long_value >= 256:
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div, mod = divmod(long_value, 256)
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result = struct.pack("B", mod) + result
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long_value = div
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result = struct.pack("B", long_value) + result
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nPad = 0
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for c in v:
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if c == __b58chars[0]:
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nPad += 1
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else:
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break
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result = b"\x00" * nPad + result
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if length is not None and len(result) != length:
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return None
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return result
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def b58check_encode(v):
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checksum = btc_hash(v)[:4]
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return b58encode(v + checksum)
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def b58check_decode(v, length=None):
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dec = b58decode(v, length)
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data, checksum = dec[:-4], dec[-4:]
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if btc_hash(data)[:4] != checksum:
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raise ValueError("invalid checksum")
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return data
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def parse_path(nstr: str) -> Address:
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"""
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Convert BIP32 path string to list of uint32 integers with hardened flags.
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Several conventions are supported to set the hardened flag: -1, 1', 1h
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e.g.: "0/1h/1" -> [0, 0x80000001, 1]
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:param nstr: path string
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:return: list of integers
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"""
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if not nstr:
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return []
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n = nstr.split("/")
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# m/a/b/c => a/b/c
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if n[0] == "m":
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n = n[1:]
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# coin_name/a/b/c => 44'/SLIP44_constant'/a/b/c
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if n[0] in slip44:
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coin_id = slip44[n[0]]
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n[0:1] = ["44h", "{}h".format(coin_id)]
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def str_to_harden(x: str) -> int:
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if x.startswith("-"):
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return H_(abs(int(x)))
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elif x.endswith(("h", "'")):
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return H_(int(x[:-1]))
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else:
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return int(x)
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try:
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return [str_to_harden(x) for x in n]
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except Exception:
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raise ValueError("Invalid BIP32 path", nstr)
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def normalize_nfc(txt):
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"""
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Normalize message to NFC and return bytes suitable for protobuf.
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This seems to be bitcoin-qt standard of doing things.
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"""
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if isinstance(txt, bytes):
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txt = txt.decode()
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return unicodedata.normalize("NFC", txt).encode()
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class expect:
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# Decorator checks if the method
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# returned one of expected protobuf messages
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# or raises an exception
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def __init__(self, expected, field=None):
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self.expected = expected
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self.field = field
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def __call__(self, f):
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@functools.wraps(f)
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def wrapped_f(*args, **kwargs):
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__tracebackhide__ = True # for pytest # pylint: disable=W0612
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ret = f(*args, **kwargs)
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if not isinstance(ret, self.expected):
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raise RuntimeError(
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"Got %s, expected %s" % (ret.__class__, self.expected)
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)
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if self.field is not None:
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return getattr(ret, self.field)
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else:
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return ret
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return wrapped_f
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def session(f):
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# Decorator wraps a BaseClient method
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# with session activation / deactivation
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@functools.wraps(f)
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def wrapped_f(client, *args, **kwargs):
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__tracebackhide__ = True # for pytest # pylint: disable=W0612
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client.open()
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try:
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return f(client, *args, **kwargs)
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finally:
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client.close()
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return wrapped_f
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# de-camelcasifier
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# https://stackoverflow.com/a/1176023/222189
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FIRST_CAP_RE = re.compile("(.)([A-Z][a-z]+)")
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ALL_CAP_RE = re.compile("([a-z0-9])([A-Z])")
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def from_camelcase(s):
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s = FIRST_CAP_RE.sub(r"\1_\2", s)
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return ALL_CAP_RE.sub(r"\1_\2", s).lower()
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def dict_from_camelcase(d, renames=None):
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if not isinstance(d, dict):
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return d
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if renames is None:
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renames = {}
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res = {}
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for key, value in d.items():
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newkey = from_camelcase(key)
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renamed_key = renames.get(newkey) or renames.get(key)
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if renamed_key:
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newkey = renamed_key
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if isinstance(value, list):
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res[newkey] = [dict_from_camelcase(v, renames) for v in value]
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else:
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res[newkey] = dict_from_camelcase(value, renames)
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return res
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