gistfile1.txt

import hashlib
import hmac
import base64
import argparse


def mact_hash(mact_id, secret_key):
	"""Twitter's base hashing algorithm for MACT"""
	
	return base64.b64encode(
		hmac.new(secret_key, mact_id, hashlib.sha256).digest())


def test_mact_hash(mact_id, expected, secret_key):
	"""Simple hash equality test."""

	actual = mact_hash(mact_id, secret_key)
	if actual == expected:
		print 'Hashes match:'
	else:
		print 'Hashes do not match:'
	print 'expected:', expected
	print 'actual:  ', actual


if __name__ == "__main__":
	parser = argparse.ArgumentParser(description='Calculate MACT Hash.')
	parser.add_argument('--key', dest='secret_key', required=True,
	                   help='hmac secret key (base64)')
	parser.add_argument('--id', dest='mact_id', required=True,
	                   help='Google Ad ID, iOS IDFA, or sha1(Android ID)')
	parser.add_argument('--expected', dest='expected',
	                   required=False, help='The expected hash value.')	
	args = parser.parse_args()

	secret_key = base64.b64decode(args.secret_key)
	if args.expected:
		test_mact_hash(args.mact_id, args.expected, secret_key)
	else:
		print mact_hash(args.mact_id, secret_key)