golden hour

/usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives

File/Folder	Size	Actions
__init__.py	246 B
__init__.pyc	284 B
__init__.pyo	284 B
asymmetric	-
ciphers	-
cmac.py	2.18 KB
cmac.pyc	2.91 KB
cmac.pyo	2.91 KB
constant_time.py	798 B
constant_time.pyc	1.12 KB
constant_time.pyo	1.12 KB
hashes.py	4.96 KB
hashes.pyc	8.23 KB
hashes.pyo	8.23 KB
hmac.py	2.3 KB
hmac.pyc	3.03 KB
hmac.pyo	3.03 KB
interfaces	-
kdf	-
keywrap.py	2.98 KB
keywrap.pyc	2.94 KB
keywrap.pyo	2.85 KB
padding.py	5.6 KB
padding.pyc	9.17 KB
padding.pyo	9.17 KB
serialization.py	5.16 KB
serialization.pyc	7.86 KB
serialization.pyo	7.86 KB
twofactor	-

Edit: hmac.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 HMACBackend
from cryptography.hazmat.primitives import hashes, interfaces

@utils.register_interface(interfaces.MACContext)
@utils.register_interface(hashes.HashContext)
class HMAC(object):
    def __init__(self, key, algorithm, backend, ctx=None):
        if not isinstance(backend, HMACBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement HMACBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )

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

self._backend = backend
        self._key = key
        if ctx is None:
            self._ctx = self._backend.create_hmac_ctx(key, self.algorithm)
        else:
            self._ctx = ctx

algorithm = utils.read_only_property("_algorithm")

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 copy(self):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        return HMAC(
            self._key,
            self.algorithm,
            backend=self._backend,
            ctx=self._ctx.copy()
        )

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)