/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/kdf/x963kdf.py is in python3-cryptography 2.1.4-1ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | # This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import struct
from cryptography import utils
from cryptography.exceptions import (
AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import constant_time, hashes
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
def _int_to_u32be(n):
return struct.pack('>I', n)
@utils.register_interface(KeyDerivationFunction)
class X963KDF(object):
def __init__(self, algorithm, length, sharedinfo, backend):
max_len = algorithm.digest_size * (2 ** 32 - 1)
if length > max_len:
raise ValueError(
"Can not derive keys larger than {0} bits.".format(max_len))
if not (sharedinfo is None or isinstance(sharedinfo, bytes)):
raise TypeError("sharedinfo must be bytes.")
self._algorithm = algorithm
self._length = length
self._sharedinfo = sharedinfo
if not isinstance(backend, HashBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HashBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
self._backend = backend
self._used = False
def derive(self, key_material):
if self._used:
raise AlreadyFinalized
self._used = True
if not isinstance(key_material, bytes):
raise TypeError("key_material must be bytes.")
output = [b""]
outlen = 0
counter = 1
while self._length > outlen:
h = hashes.Hash(self._algorithm, self._backend)
h.update(key_material)
h.update(_int_to_u32be(counter))
if self._sharedinfo is not None:
h.update(self._sharedinfo)
output.append(h.finalize())
outlen += len(output[-1])
counter += 1
return b"".join(output)[:self._length]
def verify(self, key_material, expected_key):
if not constant_time.bytes_eq(self.derive(key_material), expected_key):
raise InvalidKey
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