zlib_checksums.py

#1/usr/bin/env python

# this is from The Python
# Standard Library by example
# ISBN13: 9780321767349

import zlib

data = open('lorem.txt', 'r').read()

cksum = zlib.adler32(data)
print 'Adler32: %12d' % cksum
print '       : %12d' % zlib.adler32(data, cksum)

cksum = zlib.crc32(data)
print 'CRC-32 : %12d' % cksum
print '       : %12d' % zlib.crc32(data, cksum)