/usr/lib/python2.7/dist-packages/cryptography/hazmat/primitives/kdf/hkdf.py is in python-cryptography 1.2.3-1.
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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 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | # 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 six
from cryptography import utils
from cryptography.exceptions import (
AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import constant_time, hmac
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
@utils.register_interface(KeyDerivationFunction)
class HKDF(object):
def __init__(self, algorithm, length, salt, info, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
self._algorithm = algorithm
if not (salt is None or isinstance(salt, bytes)):
raise TypeError("salt must be bytes.")
if salt is None:
salt = b"\x00" * (self._algorithm.digest_size // 8)
self._salt = salt
self._backend = backend
self._hkdf_expand = HKDFExpand(self._algorithm, length, info, backend)
def _extract(self, key_material):
h = hmac.HMAC(self._salt, self._algorithm, backend=self._backend)
h.update(key_material)
return h.finalize()
def derive(self, key_material):
if not isinstance(key_material, bytes):
raise TypeError("key_material must be bytes.")
return self._hkdf_expand.derive(self._extract(key_material))
def verify(self, key_material, expected_key):
if not constant_time.bytes_eq(self.derive(key_material), expected_key):
raise InvalidKey
@utils.register_interface(KeyDerivationFunction)
class HKDFExpand(object):
def __init__(self, algorithm, length, info, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
self._algorithm = algorithm
self._backend = backend
max_length = 255 * (algorithm.digest_size // 8)
if length > max_length:
raise ValueError(
"Can not derive keys larger than {0} octets.".format(
max_length
))
self._length = length
if not (info is None or isinstance(info, bytes)):
raise TypeError("info must be bytes.")
if info is None:
info = b""
self._info = info
self._used = False
def _expand(self, key_material):
output = [b""]
counter = 1
while (self._algorithm.digest_size // 8) * len(output) < self._length:
h = hmac.HMAC(key_material, self._algorithm, backend=self._backend)
h.update(output[-1])
h.update(self._info)
h.update(six.int2byte(counter))
output.append(h.finalize())
counter += 1
return b"".join(output)[:self._length]
def derive(self, key_material):
if not isinstance(key_material, bytes):
raise TypeError("key_material must be bytes.")
if self._used:
raise AlreadyFinalized
self._used = True
return self._expand(key_material)
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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