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File Name : padding.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
import typing

from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives._asymmetric import (
    AsymmetricPadding as AsymmetricPadding,
)
from cryptography.hazmat.primitives.asymmetric import rsa

class PKCS1v15(AsymmetricPadding):
    name = "EMSA-PKCS1-v1_5"

class _MaxLength:
    "Sentinel value for `MAX_LENGTH`."

class _Auto:
    "Sentinel value for `AUTO`."

class _DigestLength:
    "Sentinel value for `DIGEST_LENGTH`."

class PSS(AsymmetricPadding):
    MAX_LENGTH = _MaxLength()
    AUTO = _Auto()
    DIGEST_LENGTH = _DigestLength()
    name = "EMSA-PSS"
    _salt_length: typing.Union[int, _MaxLength, _Auto, _DigestLength]

def __init__(
        self,
        mgf: MGF,
        salt_length: typing.Union[int, _MaxLength, _Auto, _DigestLength],
    ) -> None:
        self._mgf = mgf

if not isinstance(
            salt_length, (int, _MaxLength, _Auto, _DigestLength)
        ):
            raise TypeError(
                "salt_length must be an integer, MAX_LENGTH, "
                "DIGEST_LENGTH, or AUTO"
            )

if isinstance(salt_length, int) and salt_length < 0:
            raise ValueError("salt_length must be zero or greater.")

self._salt_length = salt_length

class OAEP(AsymmetricPadding):
    name = "EME-OAEP"

def __init__(
        self,
        mgf: MGF,
        algorithm: hashes.HashAlgorithm,
        label: typing.Optional[bytes],
    ):
        if not isinstance(algorithm, hashes.HashAlgorithm):
            raise TypeError("Expected instance of hashes.HashAlgorithm.")

self._mgf = mgf
        self._algorithm = algorithm
        self._label = label

class MGF(metaclass=abc.ABCMeta):
    _algorithm: hashes.HashAlgorithm

class MGF1(MGF):
    MAX_LENGTH = _MaxLength()

def __init__(self, algorithm: hashes.HashAlgorithm):
        if not isinstance(algorithm, hashes.HashAlgorithm):
            raise TypeError("Expected instance of hashes.HashAlgorithm.")

self._algorithm = algorithm

def calculate_max_pss_salt_length(
    key: typing.Union[rsa.RSAPrivateKey, rsa.RSAPublicKey],
    hash_algorithm: hashes.HashAlgorithm,
) -> int:
    if not isinstance(key, (rsa.RSAPrivateKey, rsa.RSAPublicKey)):
        raise TypeError("key must be an RSA public or private key")
    # bit length - 1 per RFC 3447
    emlen = (key.key_size + 6) // 8
    salt_length = emlen - hash_algorithm.digest_size - 2
    assert salt_length >= 0
    return salt_length

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-05-15 05:02:27
..	dir	-	0755	2025-05-15 05:02:27
__pycache__	dir	-	0755	2025-05-15 05:02:29
__init__.py	text/plain	180 B	0644	2025-04-17 01:10:59
dh.py	text/x-script.python	6.85 KB	0644	2025-04-17 01:10:59
dsa.py	text/x-script.python	8.07 KB	0644	2025-04-17 01:10:59
ec.py	text/x-script.python	12.57 KB	0644	2025-04-17 01:10:59
ed25519.py	text/x-script.python	3.41 KB	0644	2025-04-17 01:10:59
ed448.py	text/x-script.python	3.36 KB	0644	2025-04-17 01:10:59
padding.py	text/x-script.python	2.65 KB	0644	2025-04-17 01:10:59
rsa.py	text/x-script.python	11.35 KB	0644	2025-04-17 01:10:59
types.py	text/x-script.python	2.93 KB	0644	2025-04-17 01:10:59
utils.py	text/x-script.python	790 B	0644	2025-04-17 01:10:59
x25519.py	text/x-script.python	3.36 KB	0644	2025-04-17 01:10:59
x448.py	text/x-script.python	3.28 KB	0644	2025-04-17 01:10:59