Current File : //lib64/python2.7/site-packages/cryptography/hazmat/backends/commoncrypto/hashes.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 UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.primitives import hashes
@utils.register_interface(hashes.HashContext)
class _HashContext(object):
def __init__(self, backend, algorithm, ctx=None):
self._algorithm = algorithm
self._backend = backend
if ctx is None:
try:
methods = self._backend._hash_mapping[self.algorithm.name]
except KeyError:
raise UnsupportedAlgorithm(
"{0} is not a supported hash on this backend.".format(
algorithm.name),
_Reasons.UNSUPPORTED_HASH
)
ctx = self._backend._ffi.new(methods.ctx)
res = methods.hash_init(ctx)
assert res == 1
self._ctx = ctx
algorithm = utils.read_only_property("_algorithm")
def copy(self):
methods = self._backend._hash_mapping[self.algorithm.name]
new_ctx = self._backend._ffi.new(methods.ctx)
# CommonCrypto has no APIs for copying hashes, so we have to copy the
# underlying struct.
new_ctx[0] = self._ctx[0]
return _HashContext(self._backend, self.algorithm, ctx=new_ctx)
def update(self, data):
methods = self._backend._hash_mapping[self.algorithm.name]
res = methods.hash_update(self._ctx, data, len(data))
assert res == 1
def finalize(self):
methods = self._backend._hash_mapping[self.algorithm.name]
buf = self._backend._ffi.new("unsigned char[]",
self.algorithm.digest_size)
res = methods.hash_final(buf, self._ctx)
assert res == 1
return self._backend._ffi.buffer(buf)[:]
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