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Diffstat (limited to 'src/cryptography/hazmat/primitives/hashes.py')
-rw-r--r-- | src/cryptography/hazmat/primitives/hashes.py | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/cryptography/hazmat/primitives/hashes.py b/src/cryptography/hazmat/primitives/hashes.py new file mode 100644 index 00000000..8c2284e3 --- /dev/null +++ b/src/cryptography/hazmat/primitives/hashes.py @@ -0,0 +1,121 @@ +# 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 ( + AlreadyFinalized, UnsupportedAlgorithm, _Reasons +) +from cryptography.hazmat.backends.interfaces import HashBackend +from cryptography.hazmat.primitives import interfaces + + +@utils.register_interface(interfaces.HashContext) +class Hash(object): + def __init__(self, algorithm, backend, ctx=None): + if not isinstance(backend, HashBackend): + raise UnsupportedAlgorithm( + "Backend object does not implement HashBackend.", + _Reasons.BACKEND_MISSING_INTERFACE + ) + + if not isinstance(algorithm, interfaces.HashAlgorithm): + raise TypeError("Expected instance of interfaces.HashAlgorithm.") + self._algorithm = algorithm + + self._backend = backend + + if ctx is None: + self._ctx = self._backend.create_hash_ctx(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 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 |