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File Name : _cipheralgorithm.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.

from __future__ import annotations

import abc

from cryptography import utils

# This exists to break an import cycle. It is normally accessible from the
# ciphers module.

class CipherAlgorithm(metaclass=abc.ABCMeta):
    @property
    @abc.abstractmethod
    def name(self) -> str:
        """
        A string naming this mode (e.g. "AES", "Camellia").
        """

@property
    @abc.abstractmethod
    def key_sizes(self) -> frozenset[int]:
        """
        Valid key sizes for this algorithm in bits
        """

@property
    @abc.abstractmethod
    def key_size(self) -> int:
        """
        The size of the key being used as an integer in bits (e.g. 128, 256).
        """

class BlockCipherAlgorithm(CipherAlgorithm):
    key: bytes

@property
    @abc.abstractmethod
    def block_size(self) -> int:
        """
        The size of a block as an integer in bits (e.g. 64, 128).
        """

def _verify_key_size(algorithm: CipherAlgorithm, key: bytes) -> bytes:
    # Verify that the key is instance of bytes
    utils._check_byteslike("key", key)

# Verify that the key size matches the expected key size
    if len(key) * 8 not in algorithm.key_sizes:
        raise ValueError(
            f"Invalid key size ({len(key) * 8}) for {algorithm.name}."
        )
    return key

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-03-03 09:07:10
..	dir	-	root/root	0755	2026-03-03 09:07:10
__pycache__	dir	-	root/root	0755	2026-03-03 09:07:11
asymmetric	dir	-	root/root	0755	2026-03-03 09:07:10
ciphers	dir	-	root/root	0755	2026-03-03 09:07:10
kdf	dir	-	root/root	0755	2026-03-03 09:07:10
serialization	dir	-	root/root	0755	2026-03-03 09:07:10
twofactor	dir	-	root/root	0755	2026-03-03 09:07:10
__init__.py	text/plain	180 B	root/root	0644	2026-02-13 12:40:40
_asymmetric.py	text/x-script.python	532 B	root/root	0644	2026-02-13 12:40:40
_cipheralgorithm.py	text/x-script.python	1.46 KB	root/root	0644	2026-02-13 12:40:40
_serialization.py	text/x-script.python	5.02 KB	root/root	0644	2026-02-13 12:40:40
cmac.py	text/x-script.python	338 B	root/root	0644	2026-02-13 12:40:40
constant_time.py	text/x-script.python	422 B	root/root	0644	2026-02-13 12:40:40
hashes.py	text/x-script.python	4.97 KB	root/root	0644	2026-02-13 12:40:40
hmac.py	text/x-script.python	423 B	root/root	0644	2026-02-13 12:40:40
keywrap.py	text/x-script.python	5.52 KB	root/root	0644	2026-02-13 12:40:40
padding.py	text/x-script.python	5.39 KB	root/root	0644	2026-02-13 12:40:40
poly1305.py	text/x-script.python	355 B	root/root	0644	2026-02-13 12:40:40

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