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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 annotations

import typing

from cryptography import utils
from cryptography.exceptions import AlreadyFinalized, InvalidKey
from cryptography.hazmat.primitives import constant_time, hashes, hmac
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction


def _int_to_u32be(n: int) -> bytes:
    return n.to_bytes(length=4, byteorder="big")


def _common_args_checks(
    algorithm: hashes.HashAlgorithm,
    length: int,
    otherinfo: typing.Optional[bytes],
) -> None:
    max_length = algorithm.digest_size * (2**32 - 1)
    if length > max_length:
        raise ValueError(f"Cannot derive keys larger than {max_length} bits.")
    if otherinfo is not None:
        utils._check_bytes("otherinfo", otherinfo)


def _concatkdf_derive(
    key_material: bytes,
    length: int,
    auxfn: typing.Callable[[], hashes.HashContext],
    otherinfo: bytes,
) -> bytes:
    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]


class ConcatKDFHash(KeyDerivationFunction):
    def __init__(
        self,
        algorithm: hashes.HashAlgorithm,
        length: int,
        otherinfo: typing.Optional[bytes],
        backend: typing.Any = None,
    ):
        _common_args_checks(algorithm, length, otherinfo)
        self._algorithm = algorithm
        self._length = length
        self._otherinfo: bytes = otherinfo if otherinfo is not None else b""

        self._used = False

    def _hash(self) -> hashes.Hash:
        return hashes.Hash(self._algorithm)

    def derive(self, key_material: bytes) -> bytes:
        if self._used:
            raise AlreadyFinalized
        self._used = True
        return _concatkdf_derive(
            key_material, self._length, self._hash, self._otherinfo
        )

    def verify(self, key_material: bytes, expected_key: bytes) -> None:
        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
            raise InvalidKey


class ConcatKDFHMAC(KeyDerivationFunction):
    def __init__(
        self,
        algorithm: hashes.HashAlgorithm,
        length: int,
        salt: typing.Optional[bytes],
        otherinfo: typing.Optional[bytes],
        backend: typing.Any = None,
    ):
        _common_args_checks(algorithm, length, otherinfo)
        self._algorithm = algorithm
        self._length = length
        self._otherinfo: bytes = otherinfo if otherinfo is not None else b""

        if algorithm.block_size is None:
            raise TypeError(f"{algorithm.name} is unsupported for ConcatKDF")

        if salt is None:
            salt = b"\x00" * algorithm.block_size
        else:
            utils._check_bytes("salt", salt)

        self._salt = salt

        self._used = False

    def _hmac(self) -> hmac.HMAC:
        return hmac.HMAC(self._salt, self._algorithm)

    def derive(self, key_material: bytes) -> bytes:
        if self._used:
            raise AlreadyFinalized
        self._used = True
        return _concatkdf_derive(
            key_material, self._length, self._hmac, self._otherinfo
        )

    def verify(self, key_material: bytes, expected_key: bytes) -> None:
        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
            raise InvalidKey

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 750 B 0644
concatkdf.py File 3.64 KB 0644
hkdf.py File 2.97 KB 0644
kbkdf.py File 9.02 KB 0644
pbkdf2.py File 1.96 KB 0644
scrypt.py File 2.3 KB 0644
x963kdf.py File 1.96 KB 0644
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