sha1.py

import sys, os, time
import subprocess as sp
import hashlib

def measure_time(func):
    def f(*args):
        t0 = time.time()
        print('    SHA1:', func(*args))
        print('    Time:', time.time() - t0, 's')
    return f

@measure_time
def openssl_sha1(file):
    args = ('openssl', 'sha1', file)
    ossl = sp.run(args, capture_output=True)

    if ossl.returncode == 0:
        stdout = ossl.stdout.decode()
        _, sha1 = stdout.rsplit(maxsplit=1)
        return sha1

    stderr = ossl.stderr.decode()
    args_str = ' '.join(args)
    msg = f'"{args_str}" returned {ossl.returncode}:\n{stderr}'
    raise Exception(msg)

@measure_time
def hashlib_sha1(file):
    sha1 = hashlib.sha1()
    with open(file, 'rb') as f:
        while chunk := f.read(1048576):
            sha1.update(chunk)
        return sha1.hexdigest()

print('OpenSSL:')
openssl_sha1(sys.argv[1])

print('hashlib:')
hashlib_sha1(sys.argv[1])