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__pycache__	-	Open
dh.py	6.42 MB	View DL Edit
dsa.py	8.21 MB	View DL Edit
ec.py	14.67 MB	View DL Edit
ed448.py	2.58 MB	View DL Edit
ed25519.py	2.66 MB	View DL Edit
padding.py	2.09 MB	View DL Edit
rsa.py	11.53 MB	View DL Edit
types.py	896 B	View DL Edit
utils.py	742 B	View DL Edit
x448.py	2.5 MB	View DL Edit
x25519.py	2.53 MB	View DL Edit
__init__.py	956 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives/asymmetric/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.

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 PSS(AsymmetricPadding):
    MAX_LENGTH = object()
    name = "EMSA-PSS"

def __init__(self, mgf, salt_length):
        self._mgf = mgf

if (
            not isinstance(salt_length, int)
            and salt_length is not self.MAX_LENGTH
        ):
            raise TypeError("salt_length must be an integer.")

if salt_length is not self.MAX_LENGTH 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: "MGF1",
        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 MGF1(object):
    MAX_LENGTH = object()

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

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