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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
import abc
import six
class CipherAlgorithm(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def name(self):
"""
A string naming this mode (e.g. "AES", "Camellia").
"""
@abc.abstractproperty
def key_size(self):
"""
The size of the key being used as an integer in bits (e.g. 128, 256).
"""
class BlockCipherAlgorithm(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def block_size(self):
"""
The size of a block as an integer in bits (e.g. 64, 128).
"""
class Mode(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def name(self):
"""
A string naming this mode (e.g. "ECB", "CBC").
"""
class ModeWithInitializationVector(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def initialization_vector(self):
"""
The value of the initialization vector for this mode as bytes.
"""
class ModeWithNonce(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def nonce(self):
"""
The value of the nonce for this mode as bytes.
"""
class ModeWithAuthenticationTag(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def tag(self):
"""
The value of the tag supplied to the constructor of this mode.
"""
class CipherContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes through the cipher and returns the results
as bytes.
"""
@abc.abstractmethod
def finalize(self):
"""
Returns the results of processing the final block as bytes.
"""
class AEADCipherContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def authenticate_additional_data(self, data):
"""
Authenticates the provided bytes.
"""
class AEADEncryptionContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def tag(self):
"""
Returns tag bytes. This is only available after encryption is
finalized.
"""
class PaddingContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def update(self, data):
"""
Pads the provided bytes and returns any available data as bytes.
"""
@abc.abstractmethod
def finalize(self):
"""
Finalize the padding, returns bytes.
"""
class HashAlgorithm(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def name(self):
"""
A string naming this algorithm (e.g. "sha256", "md5").
"""
@abc.abstractproperty
def digest_size(self):
"""
The size of the resulting digest in bytes.
"""
@abc.abstractproperty
def block_size(self):
"""
The internal block size of the hash algorithm in bytes.
"""
class HashContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractproperty
def algorithm(self):
"""
A HashAlgorithm that will be used by this context.
"""
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes through the hash.
"""
@abc.abstractmethod
def finalize(self):
"""
Finalizes the hash context and returns the hash digest as bytes.
"""
@abc.abstractmethod
def copy(self):
"""
Return a HashContext that is a copy of the current context.
"""
@abc.abstractmethod
def verify(self, signature):
"""
Compare hash digest to signature and raises InvalidSignature
if they are not equal.
"""
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