check stored sha256 value

file_integrity_check.py

#!/usr/bin/env python3
# file_integrity_check.py
# check file integrity from a list
# use shasum -a 256 <filename> to generate initial checksum

import hashlib
from filechecksums import *     # gets precomputed variables
import os.path

def filesha256(filename, check, block_size=2**20):
    # first check if the file is there
    if os.path.isfile(filename):
        f = open(filename, "rb")
        sha256 = hashlib.sha256()
        while True:
            data = f.read(block_size)
            if not data:
                break
            sha256.update(data)
        f.close()
        result = sha256.hexdigest()
        if check == result:
            print('file integrity for', filename, 'confirmed')
        else:
            print(filename, 'SHA256 *** mismatch ***')
    else:
        print('file not found', filename)

filesha256('/Users/sable/code/test.py', test)