blievrouw / crc64iso

64-bit CRC (ISO 3309) checksum generator using python 3.x

CRC64ISO

Package for calculating checksums using 64-bit cyclic redundancy checks (CRC) according to the ISO 3309 standard.

Generator polynomial: x⁶⁴ + x⁴ + x³ + x + 1

Reference: W. H. Press, S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, "Numerical recipes in C", 2nd ed., Cambridge University Press. Pages 896ff.

Requirements

• python 3.x

Installation

pip install crc64iso

PyPI

Examples

• Calculate 64-bit checksum from a string:

from crc64iso.crc64iso import crc64

checksum = crc64iso.crc64("ILOVEMATH")

• Calculate 64-bit checksum from incremental (bytes) data:

from crc64iso.crc64iso import crc64_pair, format_crc64_pair

crc_pair_1 = crc64_pair("ILOVE".encode())
crc_pair_2 = crc64_pair("MATH".encode(), crc_pair_1)
checksum = format_crc64_pair(crc_pair_2)