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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 abc
import binascii
import six
from cryptography.bindings import _default_api
class BaseHash(six.with_metaclass(abc.ABCMeta)):
def __init__(self, api=None, ctx=None):
if api is None:
api = _default_api
self._api = api
self._ctx = self._api.create_hash_context(self) if ctx is None else ctx
def update(self, data):
self._api.update_hash_context(self._ctx, data)
def copy(self):
return self.__class__(ctx=self._copy_ctx())
def digest(self):
return self._api.finalize_hash_context(self._copy_ctx(),
self.digest_size)
def hexdigest(self):
return binascii.hexlify(self.digest()).decode("ascii")
def _copy_ctx(self):
return self._api.copy_hash_context(self._ctx)
class SHA1(BaseHash):
name = "sha1"
digest_size = 20
block_size = 64
class SHA224(BaseHash):
name = "sha224"
digest_size = 28
block_size = 64
class SHA256(BaseHash):
name = "sha256"
digest_size = 32
block_size = 64
class SHA384(BaseHash):
name = "sha384"
digest_size = 48
block_size = 128
class SHA512(BaseHash):
name = "sha512"
digest_size = 64
block_size = 128
class RIPEMD160(BaseHash):
name = "ripemd160"
digest_size = 20
block_size = 64
class Whirlpool(BaseHash):
name = "whirlpool"
digest_size = 64
block_size = 64
class MD5(BaseHash):
name = "md5"
digest_size = 16
block_size = 64
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