/usr/lib/python2.7/dist-packages/cryptography/hazmat/backends/commoncrypto/hmac.py is in python-cryptography 0.6.1-1+deb8u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | # 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.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.primitives import interfaces
@utils.register_interface(interfaces.HashContext)
class _HMACContext(object):
def __init__(self, backend, key, algorithm, ctx=None):
self.algorithm = algorithm
self._backend = backend
if ctx is None:
ctx = self._backend._ffi.new("CCHmacContext *")
try:
alg = self._backend._supported_hmac_algorithms[algorithm.name]
except KeyError:
raise UnsupportedAlgorithm(
"{0} is not a supported HMAC hash on this backend.".format(
algorithm.name),
_Reasons.UNSUPPORTED_HASH
)
self._backend._lib.CCHmacInit(ctx, alg, key, len(key))
self._ctx = ctx
self._key = key
def copy(self):
copied_ctx = self._backend._ffi.new("CCHmacContext *")
# CommonCrypto has no APIs for copying HMACs, so we have to copy the
# underlying struct.
copied_ctx[0] = self._ctx[0]
return _HMACContext(
self._backend, self._key, self.algorithm, ctx=copied_ctx
)
def update(self, data):
self._backend._lib.CCHmacUpdate(self._ctx, data, len(data))
def finalize(self):
buf = self._backend._ffi.new("unsigned char[]",
self.algorithm.digest_size)
self._backend._lib.CCHmacFinal(self._ctx, buf)
return self._backend._ffi.buffer(buf)[:]
|