======
pysha3

SHA-3 wrapper (keccak) for Python. The package is a wrapper around the
optimized Keccak Code Package, https://github.com/gvanas/KeccakCodePackage .

The module is a standalone version of my SHA-3 module from Python 3.6
(currently under development). The code in sha3module.c has been modified to
be compatible with Python 2.7 to 3.5. Python 2.6 and earlier are not
supported.

Updates since pysha 0.3

pysha3 1.0 is not compatible with pysha3 0.3!

pysha3 < 1.0 used the old Keccak implementation. During the finalization of
SHA3, NIST changed the delimiter suffix from 0x01 to 0x06. The Keccak sponge
function stayed the same. pysha3 1.0 provides the previous Keccak hash, too.

Platforms

pysha3 has been successfully tested on several platforms:

Linux (GCC, clang) on X86, X86_64 and ARMv6 (little endian)
Windows (VS 2008, VS 2010, VS2015) on X86 and X86_64

Usage

The sha3 module contains several constructors for hash objects with a
PEP 247 compatible interface. The module provides SHA3, SHAKE and Keccak:

sha3_228(), sha3_256(), sha3_384(), and sha3_512()
shake_128(), shake_256()
keccak_228(), keccak_256(), keccak_384(), and keccak_512()

The sha3 module monkey patches the hashlib module . The monkey patch is
automatically activated with the first import of the sha3 module. The
hashlib module of Python 3.6 will support the four SHA-3 algorithms and
the two SHAKE algorithms on all platforms. Therefore you shouldn't use the
sha3 module directly and rather go through the hashlib interface::

import sys
import hashlib
if sys.version_info < (3, 6):
... import sha3

s = hashlib.sha3_512()
s.name
'sha3_512'

s.digest_size
64

s.update(b"data")
s.hexdigest()
'ceca4daf960c2bbfb4a9edaca9b8137a801b65bae377e0f534ef9141c8684c0fedc1768d1afde9766572846c42b935f61177eaf97d355fa8dc2bca3fecfa754d'

s = hashlib.shake_256()
s.update(b"data")
s.hexdigest(4)
'c73dbed8'

s.hexdigest(8)
'c73dbed8527f5ae0'

s.hexdigest(16)
'c73dbed8527f5ae0568679f30ecc5cb6'

import sha3
k = sha3.keccak_512()
k.update(b"data")
k.hexdigest()
'1065aceeded3a5e4412e2187e919bffeadf815f5bd73d37fe00d384fe29f55f08462fdabe1007b993ce5b8119630e7db93101d9425d6e352e22ffe3dcb56b825'

Changelog

pysha3 1.0.2

Release: 05-Feb-2017

Rename internal C extension to _pysha3 to avoild conflict with Python 3.6'
_sha3 extension.

pysha3 1.0.1

Release: 24-Jan-2017

Fix github.org -> github.com (Pi Delport)
Fix endianness checks for Python 2 (William Grant)
Fix changelog, the Christmas release was 1.0.0, not 1.1.0

pysha3 1.0.0

Release date: 24-Dec-2016

Synchronize with Python 3.6.0 release
Move all backport related additions to backport.inc
Fix flake8 violations

pysha3 1.0b1

Release date: 01-May-2016

Update backend to use the latest Keccak Code Package. pysha3 now implements
the official NIST standard. The old Keccak hashes are available with
keccak prefix.
Add SHAKE support.
All sha3, shake and keccak variants are separate types instead of factory
functions that return the same type.
Drop Python 2.6 and Python 3.0 to 3.3 support.
Fix typo that disabled threading optimization.
Add vector files for additional tests.
Add experimental HMAC support based on examples from
http://wolfgang-ehrhardt.de/hmac-sha3-testvectors.html .
Test hashing of unaligned data.
Add ISO C11 memset_s() function as _Py_memset_s() in order to securely
wipe memory that holds sensitive data. The page
https://www.securecoding.cert.org/confluence/display/seccode/MSC06-C.+Be+aware+of+compiler+optimization+when+dealing+with+sensitive+data
explains the motivation for memset_s().
Add tox support.
Add Travis and appveyor integration.
Add _capacity_bits, _rate_bits and _suffix attributes for diagnostic
purposes.

pysha3 0.3

Release date: 14-Oct-2012

Fix 64bit big endian support
Add workaround for alignment error on 64bit SPARC machine by using the opt32
implementation.
block_size now returns NotImplemented to prevent users from using pysha3
with the hmac module.

pysha3 0.2.2

Release date: 07-Oct-2012

Re-add brg_endian.h to fix issue on Solaris (big endian platform)

pysha3 0.2.1

Release date: 06-Oct-2012

Fix MANIFEST.in to include Makefile and tests.py
Add setup.py test command with hack for inplace builds
Enhance README.txt and fixed its markup

pysha3 0.2

Release date: 06-Oct-2012

Change directory struct to use the same directory layout as Python 3.4.
Remove C++ comments from Keccak sources for ANSI C compatibility.
Declare all Keccak functions and globals as static to avoid name clashes.
Remove alias sha3() for sha3_512().
Add block_size attribute. Keccak has a internal sponge size of 1600 bits.
Release GIL around SHA3_update() calls.
Monkey patch the hashlib module to support, e.g. hashlib.sha3_512() and
hashlib.new("sha3_512")
Release GIL around SHA3_update() when the data exceeds a certain size.
Fix build on platforms with an unsigned 64bit integer type (uint64_t). The
module falls back to 32bit implementation of Keccak with interleave tables.

pysha3 0.1

Release date: 04-Oct-2012

first release
based on KeccakReferenceAndOptimized-3.2.zip

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