SHA-3 (Keccak) for Python 2.6 - 3.4
Project description
pysha3
SHA-3 wrapper (keccak) for Python. The package is a wrapper around the optimized reference implementation from http://keccak.noekeon.org/ . Only the optimizations for 32 and 64bit platforms are used. The optimized SSE and ARM assembly variants are ignored for now.
The module is a standalone version of the SHA-3 implemention of Python 3.4 (currently under development).
Usage
The sha3 module contains several constructors for hash objects with a PEP 247 compatible interface. The module provides sha3_228(), sha3_256(), sha3_384(), and sha3_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 3.4 will support the four SHA-3 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, 4):
... import sha3
>>> s = hashlib.new("sha3_512")
>>> s = hashlib.sha3_512() # alternative
>>> s.name
'sha3_512'
>>> s.digest_size
64
>>> s.update(b"data")
>>> s.hexdigest()
'1065aceeded3a5e4412e2187e919bffeadf815f5bd73d37fe00d384fe29f55f08462fdabe1007b993ce5b8119630e7db93101d9425d6e352e22ffe3dcb56b825'
Changelog
pysha3 0.2.1
Release date: 06-Oct-2012
fixed MANIFEST.in to include Makefile and tests.py
added setup.py test command with hack for inplace builds
enhanced 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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Comments from sha3module header
The code is based on KeccakReferenceAndOptimized-3.2.zip from 29 May 2012.
C++ comments are converted to ANSI C comments.
All functions and globals are declared static.
The typedef for UINT64 is commented out.
brg_endian.h is removed.
KeccakF-1600-opt[32|64]-settings.h are commented out
Some unused functions are commented out to silence compiler warnings.
In order to avoid name clashes with other software I have to declare all Keccak functions and global data as static. The C code is directly included into this file in order to access the static functions.
Keccak can be tuned with several paramenters. I try to explain all options as far as I understand them. The reference implementation also contains assembler code for ARM platforms (NEON instructions).
Common
64bit platforms
default settings of common options
Additional optimiation instructions (disabled by default):
When neither UseSSE, UseMMX nor UseXOP is configured, ROL64 (rotate left 64) is implemented as:
UseBebigokimisa can’t be used in combination with UseSSE, UseMMX or UseXOP. UseOnlySIMD64 has no effect unless UseSSE is specified.
Tests have shown that UseSSE + UseOnlySIMD64 is about three to four times SLOWER than UseBebigokimisa. UseSSE and UseMMX are about two times slower. (tested by CH and AP)
32bit platforms
default settings of common options