ÿØÿàJFIFÿþ ÿÛC       ÿÛC ÿÀÿÄÿÄ"#QrÿÄÿÄ&1!A"2qQaáÿÚ ?Øy,æ/3JæݹÈ߲؋5êXw²±ÉyˆR”¾I0ó2—PI¾IÌÚiMö¯–þrìN&"KgX:Šíµ•nTJnLK„…@!‰-ý ùúmë;ºgµŒ&ó±hw’¯Õ@”Ü— 9ñ-ë.²1<yà‚¹ïQÐU„ہ?.’¦èûbß±©Ö«Âw*VŒ) `$‰bØԟ’ëXÖ-ËTÜíGÚ3ð«g Ÿ§¯—Jx„–’U/ÂÅv_s(Hÿ@TñJÑãõçn­‚!ÈgfbÓc­:él[ðQe 9ÀPLbÃãCµm[5¿ç'ªjglå‡Ûí_§Úõl-;"PkÞÞÁQâ¼_Ñ^¢SŸx?"¸¦ùY騐ÒOÈ q’`~~ÚtËU¹CڒêV  I1Áß_ÿÙ# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function from cryptography.exceptions import UnsupportedAlgorithm, _Reasons from cryptography.hazmat.backends import _get_backend from cryptography.hazmat.backends.interfaces import HMACBackend from cryptography.hazmat.primitives import constant_time from cryptography.hazmat.primitives.twofactor import InvalidToken from cryptography.hazmat.primitives.twofactor.hotp import HOTP from cryptography.hazmat.primitives.twofactor.utils import _generate_uri class TOTP(object): def __init__( self, key, length, algorithm, time_step, backend=None, enforce_key_length=True, ): backend = _get_backend(backend) if not isinstance(backend, HMACBackend): raise UnsupportedAlgorithm( "Backend object does not implement HMACBackend.", _Reasons.BACKEND_MISSING_INTERFACE, ) self._time_step = time_step self._hotp = HOTP(key, length, algorithm, backend, enforce_key_length) def generate(self, time): counter = int(time / self._time_step) return self._hotp.generate(counter) def verify(self, totp, time): if not constant_time.bytes_eq(self.generate(time), totp): raise InvalidToken("Supplied TOTP value does not match.") def get_provisioning_uri(self, account_name, issuer): return _generate_uri( self._hotp, "totp", account_name, issuer, [("period", int(self._time_step))], )