def create_check(signature, amount):
"""
Creates a check to sign
"""
random_number = random.getrandbits(128)
check = {
"amount": amount,
"signature_customer_public_key": signature,
"merchant_id": "01",
"token": random_number
}
return serialize(check).decode()
def test_merchant_changed_check(self):
path = "./cryptobank/test/functionalTests/keys/"
"""
Check that a merchant cannot change the content of a check without the bank noticing
"""
client_key = Key.import_key_from_path(path + "customer.pubkey")
with open(path + "check.json", "r") as file_:
signed_check = unserialize(file_.readline())
check_signature = signed_check["signature"]
base64_check = signed_check["base64_check"]
#self.assertTrue(verify_signature_check(client_key, check_signature, base64_check))
# check that if someone has changed something to the check, the bank does not accept the check
false_check = unserialize(base64_check)
false_check["amount"] = 100
false_check_64 = serialize(false_check).decode()
self.assertFalse(verify_signature_check(client_key, check_signature, false_check_64))
