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__pycache__	-	Open
concatkdf.py	3.68 MB	View DL Edit
hkdf.py	2.96 MB	View DL Edit
kbkdf.py	7.49 MB	View DL Edit
pbkdf2.py	1.98 MB	View DL Edit
scrypt.py	2.18 MB	View DL Edit
x963kdf.py	1.96 MB	View DL Edit
__init__.py	715 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives/kdf/x963kdf.py

# 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.

import struct
import typing

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    InvalidKey,
)
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)

class X963KDF(KeyDerivationFunction):
    def __init__(
        self,
        algorithm: hashes.HashAlgorithm,
        length: int,
        sharedinfo: typing.Optional[bytes],
        backend: typing.Any = None,
    ):
        max_len = algorithm.digest_size * (2 ** 32 - 1)
        if length > max_len:
            raise ValueError(
                "Cannot derive keys larger than {} bits.".format(max_len)
            )
        if sharedinfo is not None:
            utils._check_bytes("sharedinfo", sharedinfo)

self._algorithm = algorithm
        self._length = length
        self._sharedinfo = sharedinfo
        self._used = False

def derive(self, key_material: bytes) -> bytes:
        if self._used:
            raise AlreadyFinalized
        self._used = True
        utils._check_byteslike("key_material", key_material)
        output = [b""]
        outlen = 0
        counter = 1

while self._length > outlen:
            h = hashes.Hash(self._algorithm)
            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: bytes, expected_key: bytes) -> None:
        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
            raise InvalidKey

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