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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 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 CipherContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def update(self, data):
"""
update takes bytes and return bytes
"""
@abc.abstractmethod
def finalize(self):
"""
finalize return bytes
"""
class PaddingContext(six.with_metaclass(abc.ABCMeta)):
@abc.abstractmethod
def update(self, data):
"""
update takes bytes and return bytes
"""
@abc.abstractmethod
def finalize(self):
"""
finalize return 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):
"""
hash data as bytes
"""
@abc.abstractmethod
def finalize(self):
"""
finalize this copy of the hash and return the digest as bytes.
"""
@abc.abstractmethod
def copy(self):
"""
return a HashContext that is a copy of the current context.
"""
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