The requested URL was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
355ž cThe requested URL was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
! lae Ju@plJbѿ l! .. hazmat:: Bindings ======== .. module:: cryptography.hazmat.bindings ``cryptography`` aims to provide low-level CFFI based bindings to multiple native C libraries. These provide no automatic initialization of the library and may not provide complete wrappers for its API. Using these functions directly is likely to require you to be careful in managing memory allocation, locking and other resources. Individual bindings ------------------- .. toctree:: :maxdepth: 1 openssl commoncrypto t d .. hazmat:: Message digests =============== .. module:: cryptography.hazmat.primitives.hashes .. class:: Hash(algorithm, backend) A cryptographic hash function takes an arbitrary block of data and calculates a fixed-size bit string (a digest), such that different data results (with a high probability) in different digests. This is an implementation of :class:`~cryptography.hazmat.primitives.hashes.HashContext` meant to be used with :class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm` implementations to provide an incremental interface to calculating various message digests. .. doctest:: >>> from cryptography.hazmat.backends import default_backend >>> from cryptography.hazmat.primitives import hashes >>> digest = hashes.Hash(hashes.SHA256(), backend=default_backend()) >>> digest.update(b"abc") >>> digest.update(b"123") >>> digest.finalize() 'l\xa1=R\xcap\xc8\x83\xe0\xf0\xbb\x10\x1eBZ\x89\xe8bM\xe5\x1d\xb2\xd29%\x93\xafj\x84\x11\x80\x90' If the backend doesn't support the requested ``algorithm`` an :class:`~cryptography.exceptions.UnsupportedAlgorithm` exception will be raised. Keep in mind that attacks against cryptographic hashes only get stronger with time, and that often algorithms that were once thought to be strong, become broken. Because of this it's important to include a plan for upgrading the hash algorithm you use over time. For more information, see `Lifetimes of cryptographic hash functions`_. :param algorithm: A :class:`~cryptography.hazmat.primitives.hashes.HashAlgorithm` instance such as those described in :ref:`below