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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 six
from cryptography import utils
from cryptography.exceptions import AlreadyFinalized
from cryptography.hazmat.primitives import interfaces
@utils.register_interface(interfaces.HashContext)
class Hash(object):
def __init__(self, algorithm, backend=None, ctx=None):
if not isinstance(algorithm, interfaces.HashAlgorithm):
raise TypeError("Expected instance of interfaces.HashAlgorithm.")
self.algorithm = algorithm
if backend is None:
from cryptography.hazmat.bindings import _default_backend
backend = _default_backend
self._backend = backend
if ctx is None:
self._ctx = self._backend.create_hash_ctx(self.algorithm)
else:
self._ctx = ctx
def update(self, data):
if self._ctx is None:
raise AlreadyFinalized("Context was already finalized")
if isinstance(data, six.text_type):
raise TypeError("Unicode-objects must be encoded before hashing")
self._ctx.update(data)
def copy(self):
if self._ctx is None:
raise AlreadyFinalized("Context was already finalized")
return Hash(
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
@utils.register_interface(interfaces.HashAlgorithm)
class SHA1(object):
name = "sha1"
digest_size = 20
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA224(object):
name = "sha224"
digest_size = 28
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA256(object):
name = "sha256"
digest_size = 32
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA384(object):
name = "sha384"
digest_size = 48
block_size = 128
@utils.register_interface(interfaces.HashAlgorithm)
class SHA512(object):
name = "sha512"
digest_size = 64
block_size = 128
@utils.register_interface(interfaces.HashAlgorithm)
class RIPEMD160(object):
name = "ripemd160"
digest_size = 20
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class Whirlpool(object):
name = "whirlpool"
digest_size = 64
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class MD5(object):
name = "md5"
digest_size = 16
block_size = 64
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