C///

\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # 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 import abc import six from cryptography import utils from cryptography.exceptions import ( AlreadyFinalized, UnsupportedAlgorithm, _Reasons ) from cryptography.hazmat.backends.interfaces import HashBackend @six.add_metaclass(abc.ABCMeta) class HashAlgorithm(object): @abc.abstractproperty def name(self): """ A string naming this algorithm (e.g. "sha256", "md5"). """ @abc.abstractproperty def digest_size(self): """ The size of the resulting digest in bytes. """ @abc.abstractproperty def block_size(self): """ The internal block size of the hash algorithm in bytes. """ @six.add_metaclass(abc.ABCMeta) class HashContext(object): @abc.abstractproperty def algorithm(self): """ A HashAlgorithm that will be used by this context. """ @abc.abstractmethod def update(self, data): """ Processes the provided bytes through the hash. """ @abc.abstractmethod def finalize(self): """ Finalizes the hash context and returns the hash digest as bytes. """ @abc.abstractmethod def copy(self): """ Return a HashContext that is a copy of the current context. """ @utils.register_interface(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, HashAlgorithm): raise TypeError("Expected instance of hashes.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(HashAlgorithm) class SHA1(object): name = "sha1" digest_size = 20 block_size = 64 @utils.register_interface(HashAlgorithm) class SHA224(object): name = "sha224" digest_size = 28 block_size = 64 @utils.register_interface(HashAlgorithm) class SHA256(object): name = "sha256" digest_size = 32 block_size = 64 @uti