def test_26_is_previous_otp(self):
# check if the OTP was used previously
serial = "previous"
db_token = Token(serial, tokentype="totp")
db_token.save()
token = TotpTokenClass(db_token)
token.set_otpkey(self.otpkey)
token.set_hashlib("sha1")
token.set_otplen(6)
# Authenticate with the current OTP value
counter = token._time2counter(time.time(), timeStepping=30)
otp_now = token._calc_otp(counter)
r = token.check_otp(otp_now, window=180)
self.assertEqual(r, counter)
# Now we try several is_previous_otp and the timeShift must stay the same!
ts0 = float(token.get_tokeninfo("timeShift"))
self.assertTrue(-181 < ts0 < 181)
# Too old
r = token.is_previous_otp(token._calc_otp(counter - 3))
self.assertEqual(r, False)
ts = float(token.get_tokeninfo("timeShift"))
self.assertEqual(ts, ts0)
# The same OTP value
r = token.is_previous_otp(otp_now)
self.assertEqual(r, True)
ts = float(token.get_tokeninfo("timeShift"))
self.assertEqual(ts, ts0)
# Future value
r = token.is_previous_otp(token._calc_otp(counter + 8))
self.assertEqual(r, False)
ts = float(token.get_tokeninfo("timeShift"))
self.assertEqual(ts, ts0)
