anycrc 0.3.0

Python CRC Computation Library

This is a Cython module with bindings to the crcany library. It supports calculating CRC hashes of arbitary sizes as well as updating a crc hash over time.

Installation

pip install anycrc

Usage

Use an existing model:

>>> import anycrc
>>> crc32 = anycrc.Model('CRC32-ISO-HDLC')
>>> crc32.calc(b'Hello World!')
472456355

Read the data in chunks:

>>> crc32.reset() #set to the initial value
>>> crc32.calc(b'Hello ')
3928882368
>>> crc32.calc(b'World!')
472456355

Specify your own CRC parameters:

>>> # width, poly, init, refin, refout, xorout
>>> my_crc = anycrc.CRC(10, 0b0101010101, 0x3ff, True, False, 0)
>>> my_crc.calc('Hello World!')
35

For a list of pre-built models, check models.py

Benchmarks

Calculating the CRC32 for lorem ipsum 10 million times:

Module	Time Elapsed	Average Time	Relative
anycrc	7.732s	0.773 us/run	1.000
binascii	7.612s	0.761 us/run	0.984
fastcrc	16.483s	1.648 us/run	2.132
crcmod-plus	18.259s	1.826 us/run	2.361