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# 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 HMACBackend
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import constant_time, hashes, hmac
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
def _int_to_u32be(n):
return struct.pack('>I', n)
def _common_args_checks(algorithm, length, otherinfo):
max_length = algorithm.digest_size * (2 ** 32 - 1)
if length > max_length:
raise ValueError(
"Can not derive keys larger than {0} bits.".format(
max_length
))
if otherinfo is not None:
utils._check_bytes("otherinfo", otherinfo)
def _concatkdf_derive(key_material, length, auxfn, otherinfo):
utils._check_byteslike("key_material", key_material)
output = [b""]
outlen = 0
counter = 1
while (length > outlen):
h = auxfn()
h.update(_int_to_u32be(counter))
h.update(key_material)
h.update(otherinfo)
output.append(h.finalize())
outlen += len(output[-1])
counter += 1
return b"".join(output)[:length]
@utils.register_interface(KeyDerivationFunction)
class ConcatKDFHash(object):
def __init__(self, algorithm, length, otherinfo, backend):
_common_args_checks(algorithm, length, otherinfo)
self._algorithm = algorithm
self._length = length
self._otherinfo = otherinfo
if self._otherinfo is None:
self._otherinfo = b""
if not isinstance(backend, HashBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HashBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
self._backend = backend
self._used = False
def _hash(self):
return hashes.Hash(self._algorithm, self._backend)
def derive(self, key_material):
if self._used:
raise AlreadyFinalized
self._used = True
return _concatkdf_derive(key_material, self._length,
self._hash, self._otherinfo)
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 ConcatKDFHMAC(object):
def __init__(self, algorithm, length, salt, otherinfo, backend):
_common_args_checks(algorithm, length, otherinfo)
self._algorithm = algorithm
self._length = length
self._otherinfo = otherinfo
if self._otherinfo is None:
self._otherinfo = b""
if salt is None:
salt = b"\x00" * algorithm.block_size
else:
utils._check_bytes("salt", salt)
self._salt = salt
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
self._backend = backend
self._used = False
def _hmac(self):
return hmac.HMAC(self._salt, self._algorithm, self._backend)
def derive(self, key_material):
if self._used:
raise AlreadyFinalized
self._used = True
return _concatkdf_derive(key_material, self._length,
self._hmac, self._otherinfo)
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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