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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
from cryptography.hazmat.primitives import interfaces
class Cipher(object):
def __init__(self, algorithm, mode, backend=None):
super(Cipher, self).__init__()
if backend is None:
from cryptography.hazmat.bindings import (
_default_backend as backend,
)
self.algorithm = algorithm
self.mode = mode
self._backend = backend
def encryptor(self):
return _CipherContext(
self._backend.ciphers.create_encrypt_ctx(self.algorithm,
self.mode))
def decryptor(self):
return _CipherContext(
self._backend.ciphers.create_decrypt_ctx(self.algorithm,
self.mode))
@interfaces.register(interfaces.CipherContext)
class _CipherContext(object):
def __init__(self, ctx):
self._ctx = ctx
def update(self, data):
if self._ctx is None:
raise ValueError("Context was already finalized")
return self._ctx.update(data)
def finalize(self):
if self._ctx is None:
raise ValueError("Context was already finalized")
data = self._ctx.finalize()
self._ctx = None
return data
class AES(object):
name = "AES"
block_size = 128
key_sizes = frozenset([128, 192, 256])
def __init__(self, key):
super(AES, self).__init__()
self.key = key
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))
@property
def key_size(self):
return len(self.key) * 8
class Camellia(object):
name = "camellia"
block_size = 128
key_sizes = frozenset([128, 192, 256])
def __init__(self, key):
super(Camellia, self).__init__()
self.key = key
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))
@property
def key_size(self):
return len(self.key) * 8
class TripleDES(object):
name = "3DES"
block_size = 64
key_sizes = frozenset([64, 128, 192])
def __init__(self, key):
super(TripleDES, self).__init__()
if len(key) == 8:
key += key + key
elif len(key) == 16:
key += key[:8]
self.key = key
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))
@property
def key_size(self):
return len(self.key) * 8
class Blowfish(object):
name = "Blowfish"
block_size = 64
key_sizes = frozenset(range(32, 449, 8))
def __init__(self, key):
super(Blowfish, self).__init__()
self.key = key
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))
@property
def key_size(self):
return len(self.key) * 8
class CAST5(object):
name = "CAST5"
block_size = 64
key_sizes = frozenset([40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128])
def __init__(self, key):
super(CAST5, self).__init__()
self.key = key
# Verify that the key size matches the expected key size
if self.key_size not in self.key_sizes:
raise ValueError("Invalid key size ({0}) for {1}".format(
self.key_size, self.name
))
@property
def key_size(self):
return len(self.key) * 8
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