OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 __init__.py	246 bytes	11/30/2017 01:53:32 AM	rw-r--r--
📁 __pycache__	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📁 asymmetric	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📁 ciphers	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 cmac.py	2.17 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 constant_time.py	798 bytes	11/30/2017 01:53:32 AM	rw-r--r--
📄 hashes.py	4.7 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 hmac.py	2.28 KB	11/30/2017 01:53:32 AM	rw-r--r--
📁 kdf	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 keywrap.py	3.19 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 mac.py	884 bytes	11/30/2017 01:53:32 AM	rw-r--r--
📄 padding.py	5.6 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 serialization.py	5.38 KB	11/30/2017 01:53:32 AM	rw-r--r--
📁 twofactor	-	11/05/2020 06:02:51 AM	rwxr-xr-x

Editing: cmac.py

# This file is dual licensed under the terms of the Apache License, Version
# 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

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import CMACBackend
from cryptography.hazmat.primitives import ciphers, mac

@utils.register_interface(mac.MACContext)
class CMAC(object):
    def __init__(self, algorithm, backend, ctx=None):
        if not isinstance(backend, CMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement CMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError(
                "Expected instance of BlockCipherAlgorithm."
            )
        self._algorithm = algorithm

self._backend = backend
        if ctx is None:
            self._ctx = self._backend.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx

def update(self, data):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        if not isinstance(data, bytes):
            raise TypeError("data must be bytes.")
        self._ctx.update(data)

def finalize(self):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        digest = self._ctx.finalize()
        self._ctx = None
        return digest

def verify(self, signature):
        if not isinstance(signature, bytes):
            raise TypeError("signature must be bytes.")
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")

ctx, self._ctx = self._ctx, None
        ctx.verify(signature)

def copy(self):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        return CMAC(
            self._algorithm,
            backend=self._backend,
            ctx=self._ctx.copy()
        )