/usr/lib/python2.7/dist-packages/cryptography/hazmat/primitives/asymmetric/padding.py is in python-cryptography 1.2.3-1ubuntu0.2.
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# 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
@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
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