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?? ..
?? __init__.py(1020 B)
?? __pycache__
?? dh.py(5.53 KB)
?? dsa.py(7.01 KB)
?? ec.py(13.68 KB)
?? ed25519.py(2.34 KB)
?? ed448.py(2.27 KB)
?? padding.py(2.2 KB)
?? rsa.py(10.25 KB)
?? utils.py(1.33 KB)
?? x25519.py(2.22 KB)
?? x448.py(2.2 KB)

Editing: 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 absolute_import, division, print_function

import abc

import six

from cryptography import utils
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import rsa

@six.add_metaclass(abc.ABCMeta)
class AsymmetricPadding(object):
    @abc.abstractproperty
    def name(self):
        """
        A string naming this padding (e.g. "PSS", "PKCS1").
        """

@utils.register_interface(AsymmetricPadding)
class PKCS1v15(object):
    name = "EMSA-PKCS1-v1_5"

@utils.register_interface(AsymmetricPadding)
class PSS(object):
    MAX_LENGTH = object()
    name = "EMSA-PSS"

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

if (
            not isinstance(salt_length, six.integer_types)
            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

@utils.register_interface(AsymmetricPadding)
class OAEP(object):
    name = "EME-OAEP"

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

self._algorithm = algorithm

def calculate_max_pss_salt_length(key, hash_algorithm):
    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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