108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
|
# 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 import utils
|
||
|
|
from cryptography.hazmat.primitives import interfaces
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
@utils.register_interface(interfaces.ModeWithInitializationVector)
|
||
|
|
class CBC(object):
|
||
|
|
name = "CBC"
|
||
|
|
|
||
|
|
def __init__(self, initialization_vector):
|
||
|
|
self.initialization_vector = initialization_vector
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
if len(self.initialization_vector) * 8 != algorithm.block_size:
|
||
|
|
raise ValueError("Invalid iv size ({0}) for {1}".format(
|
||
|
|
len(self.initialization_vector), self.name
|
||
|
|
))
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
class ECB(object):
|
||
|
|
name = "ECB"
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
@utils.register_interface(interfaces.ModeWithInitializationVector)
|
||
|
|
class OFB(object):
|
||
|
|
name = "OFB"
|
||
|
|
|
||
|
|
def __init__(self, initialization_vector):
|
||
|
|
self.initialization_vector = initialization_vector
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
if len(self.initialization_vector) * 8 != algorithm.block_size:
|
||
|
|
raise ValueError("Invalid iv size ({0}) for {1}".format(
|
||
|
|
len(self.initialization_vector), self.name
|
||
|
|
))
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
@utils.register_interface(interfaces.ModeWithInitializationVector)
|
||
|
|
class CFB(object):
|
||
|
|
name = "CFB"
|
||
|
|
|
||
|
|
def __init__(self, initialization_vector):
|
||
|
|
self.initialization_vector = initialization_vector
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
if len(self.initialization_vector) * 8 != algorithm.block_size:
|
||
|
|
raise ValueError("Invalid iv size ({0}) for {1}".format(
|
||
|
|
len(self.initialization_vector), self.name
|
||
|
|
))
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
@utils.register_interface(interfaces.ModeWithNonce)
|
||
|
|
class CTR(object):
|
||
|
|
name = "CTR"
|
||
|
|
|
||
|
|
def __init__(self, nonce):
|
||
|
|
self.nonce = nonce
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
if len(self.nonce) * 8 != algorithm.block_size:
|
||
|
|
raise ValueError("Invalid nonce size ({0}) for {1}".format(
|
||
|
|
len(self.nonce), self.name
|
||
|
|
))
|
||
|
|
|
||
|
|
|
||
|
|
@utils.register_interface(interfaces.Mode)
|
||
|
|
@utils.register_interface(interfaces.ModeWithInitializationVector)
|
||
|
|
@utils.register_interface(interfaces.ModeWithAuthenticationTag)
|
||
|
|
class GCM(object):
|
||
|
|
name = "GCM"
|
||
|
|
|
||
|
|
def __init__(self, initialization_vector, tag=None):
|
||
|
|
# len(initialization_vector) must in [1, 2 ** 64), but it's impossible
|
||
|
|
# to actually construct a bytes object that large, so we don't check
|
||
|
|
# for it
|
||
|
|
if tag is not None and len(tag) < 4:
|
||
|
|
raise ValueError(
|
||
|
|
"Authentication tag must be 4 bytes or longer"
|
||
|
|
)
|
||
|
|
|
||
|
|
self.initialization_vector = initialization_vector
|
||
|
|
self.tag = tag
|
||
|
|
|
||
|
|
def validate_for_algorithm(self, algorithm):
|
||
|
|
pass
|