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Synss / python-mbedtls / 8860635695

27 Apr 2024 02:49PM CUT coverage: 87.47%. Remained the same
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2583 of 2953 relevant lines covered (87.47%)

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93.33
/src/mbedtls/cipher/DES.py
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# SPDX-License-Identifier: MIT
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# Copyright (c) 2016, Elaborated Networks GmbH
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# Copyright (c) 2019, Mathias Laurin
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"""Data Encryption Standard (DES) cipher developed by IBM
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in the 70's."""
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from __future__ import annotations
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from typing import Final, Literal, Optional, Union
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from mbedtls.exceptions import TLSError
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from ._cipher import Cipher, Mode
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__all__ = ["block_size", "key_size", "new"]
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block_size: Final = 8
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key_size: Final = 8
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def new(
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    key: bytes,
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    mode: Union[int, Literal[Mode.CBC, Mode.ECB]],
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    iv: Optional[bytes] = None,
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) -> Cipher:
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    """Return a `Cipher` object that can perform DES encryption and
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    decryption.
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    Data Encryption Standard (DES) cipher developed by IBM in the 70's.
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    Parameters:
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        key: The key to encrypt decrypt.  If None,
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            encryption and decryption are unavailable.
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        mode: The mode of operation of the cipher.
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        iv: The initialization vector (IV).  The IV is
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            required for every mode but ECB and CTR where it is ignored.
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            If not set, the IV is initialized to all 0, which should not
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            be used for encryption.
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    """
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    mode_ = Mode(mode)
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    if len(key) != key_size:
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        raise TLSError(msg="key size must be 16 bytes, got %r" % len(key))
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    if mode_ not in {Mode.CBC, Mode.ECB}:
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        raise TLSError(msg="unsupported mode %r" % mode_)
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    name = ("DES-%s" % mode_.name).encode("ascii")
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    return Cipher(name, key, mode_, iv)
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