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Current File : //proc/self/root/lib64/python2.7/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.

from __future__ import absolute_import, division, print_function

import abc
import math

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 = int(math.ceil((key.key_size - 1) / 8.0))
    salt_length = emlen - hash_algorithm.digest_size - 2
    assert salt_length >= 0
    return salt_length

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