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__init__.py 0000644 00000000440 15204267724 0006664 0 ustar 00 # 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 class InvalidToken(Exception): pass totp.py 0000644 00000003364 15204267724 0006123 0 ustar 00 # 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))], ) __pycache__/totp.cpython-36.opt-1.pyc 0000644 00000003510 15204267724 0013337 0 ustar 00 3 l�_� � @ s� d dl mZmZmZ d dlmZmZ d dlmZ d dl m Z d dl m Z d dl mZ d dlmZ d dlmZ G d d � d e�Zd S ) � )�absolute_import�division�print_function)�UnsupportedAlgorithm�_Reasons)� _get_backend)� HMACBackend)� constant_time)� InvalidToken)�HOTP)� _generate_uric @ s. e Zd Zd dd�Zdd� Zdd� Zd d � ZdS ) �TOTPNTc C s: t |�}t|t�s tdtj��|| _t|||||�| _d S )Nz.Backend object does not implement HMACBackend.) r � isinstancer r r ZBACKEND_MISSING_INTERFACE� _time_stepr �_hotp)�self�keyZlength� algorithmZ 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Zcryptography.exceptionsr r Z cryptography.hazmat.backendsr Z'cryptography.hazmat.backends.interfacesr Z cryptography.hazmat.primitivesr r Z%cryptography.hazmat.primitives.hashesr r r Z(cryptography.hazmat.primitives.twofactorr Z.cryptography.hazmat.primitives.twofactor.utilsr �objectr r r r r! �<module> s utils.py 0000644 00000001726 15204267724 0006275 0 ustar 00 # 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 import base64 from six.moves.urllib.parse import quote, urlencode def _generate_uri(hotp, type_name, account_name, issuer, extra_parameters): parameters = [ ("digits", hotp._length), ("secret", base64.b32encode(hotp._key)), ("algorithm", hotp._algorithm.name.upper()), ] if issuer is not None: parameters.append(("issuer", issuer)) parameters.extend(extra_parameters) uriparts = { "type": type_name, "label": ( "%s:%s" % (quote(issuer), quote(account_name)) if issuer else quote(account_name) ), "parameters": urlencode(parameters), } return "otpauth://{type}/{label}?{parameters}".format(**uriparts) hotp.py 0000644 00000005167 15204267724 0006112 0 ustar 00 # 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 import struct import six 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, hmac from cryptography.hazmat.primitives.hashes import SHA1, SHA256, SHA512 from cryptography.hazmat.primitives.twofactor import InvalidToken from cryptography.hazmat.primitives.twofactor.utils import _generate_uri class HOTP(object): def __init__( self, key, length, algorithm, 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, ) if len(key) < 16 and enforce_key_length is True: raise ValueError("Key length has to be at least 128 bits.") if not isinstance(length, six.integer_types): raise TypeError("Length parameter must be an integer type.") if length < 6 or length > 8: raise ValueError("Length of HOTP has to be between 6 to 8.") if not isinstance(algorithm, (SHA1, SHA256, SHA512)): raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.") self._key = key self._length = length self._algorithm = algorithm self._backend = backend def generate(self, counter): truncated_value = self._dynamic_truncate(counter) hotp = truncated_value % (10 ** self._length) return "{0:0{1}}".format(hotp, self._length).encode() def verify(self, hotp, counter): if not constant_time.bytes_eq(self.generate(counter), hotp): raise InvalidToken("Supplied HOTP value does not match.") def _dynamic_truncate(self, counter): ctx = hmac.HMAC(self._key, self._algorithm, self._backend) ctx.update(struct.pack(">Q", counter)) hmac_value = ctx.finalize() offset = six.indexbytes(hmac_value, len(hmac_value) - 1) & 0b1111 p = hmac_value[offset : offset + 4] return struct.unpack(">I", p)[0] & 0x7FFFFFFF def get_provisioning_uri(self, account_name, counter, issuer): return _generate_uri( self, "hotp", account_name, issuer, [("counter", int(counter))] )
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