OVMS3/OVMS.V3/components/wolfssl/wrapper/python/wolfcrypt/docs/digest.rst

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Message Digests
===============
.. module:: wolfcrypt.hashes
A **message digest** is the output of a **cryptographic hash function**
containing a string of bytes created by a **one-way formula** using the
original message as input.
Message digests are designed to protect the integrity of a piece of data or
media to detect changes and alterations to any part of a message.
Hashing Classes
---------------
Interface
~~~~~~~~~
All Hashing Functions available in this module implements the following
interface:
.. autoclass:: _Hash
:members:
SHA-1
~~~~~
.. attention::
NIST has deprecated SHA-1 in favor of the SHA-2 variants. New applications
are strongly suggested to use SHA-2 over SHA-1.
.. autoclass:: Sha
SHA-2 family
~~~~~~~~~~~~
.. autoclass:: Sha256
.. autoclass:: Sha384
.. autoclass:: Sha512
Example
-------
.. doctest::
>>> from wolfcrypt.hashes import Sha256
>>>
>>> s = Sha256()
>>> s.update(b'wolf')
>>> s.update(b'crypt')
>>> s.digest()
b'\x96\xe0.{\x1c\xbc\xd6\xf1\x04\xfe\x1f\xdbFR\x02zU\x05\xb6\x86R\xb7\x00\x95\xc61\x8f\x9d\xce\r\x18D'
>>> s.hexdigest()
b'96e02e7b1cbcd6f104fe1fdb4652027a5505b68652b70095c6318f9dce0d1844'
>>>
>>> s.update(b'rocks')
>>> s.hexdigest()
b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'
>>>
>>> Sha256(b'wolfcryptrocks').hexdigest()
b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'
>>>
>>> Sha256.new(b'wolfcryptrocks').hexdigest()
b'e1a50df419d65715c48316bdc6a6f7f0485f4b26c1b107228faf17988b61c83f'