moving to scripts

asq-env/lib/python3.9/site-packages/cryptography/hazmat/primitives/twofactor/__init__.py

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+# 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.
+
+
+class InvalidToken(Exception):
+    pass

asq-env/lib/python3.9/site-packages/cryptography/hazmat/primitives/twofactor/hotp.py

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+# 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.
+
+
+import base64
+import struct
+import typing
+from urllib.parse import quote, urlencode
+
+from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
+from cryptography.hazmat.backends import _get_backend
+from cryptography.hazmat.backends.interfaces import Backend, 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
+
+
+_ALLOWED_HASH_TYPES = typing.Union[SHA1, SHA256, SHA512]
+
+
+def _generate_uri(
+    hotp: "HOTP",
+    type_name: str,
+    account_name: str,
+    issuer: typing.Optional[str],
+    extra_parameters: typing.List[typing.Tuple[str, int]],
+) -> str:
+    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)
+
+
+class HOTP(object):
+    def __init__(
+        self,
+        key: bytes,
+        length: int,
+        algorithm: _ALLOWED_HASH_TYPES,
+        backend: typing.Optional[Backend] = None,
+        enforce_key_length: bool = True,
+    ) -> None:
+        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, int):
+            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: int) -> bytes:
+        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: bytes, counter: int) -> None:
+        if not constant_time.bytes_eq(self.generate(counter), hotp):
+            raise InvalidToken("Supplied HOTP value does not match.")
+
+    def _dynamic_truncate(self, counter: int) -> int:
+        ctx = hmac.HMAC(self._key, self._algorithm, self._backend)
+        ctx.update(struct.pack(">Q", counter))
+        hmac_value = ctx.finalize()
+
+        offset = 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: str, counter: int, issuer: typing.Optional[str]
+    ) -> str:
+        return _generate_uri(
+            self, "hotp", account_name, issuer, [("counter", int(counter))]
+        )

asq-env/lib/python3.9/site-packages/cryptography/hazmat/primitives/twofactor/totp.py

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+# 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.
+
+import typing
+
+from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
+from cryptography.hazmat.backends import _get_backend
+from cryptography.hazmat.backends.interfaces import Backend, HMACBackend
+from cryptography.hazmat.primitives import constant_time
+from cryptography.hazmat.primitives.twofactor import InvalidToken
+from cryptography.hazmat.primitives.twofactor.hotp import (
+    HOTP,
+    _ALLOWED_HASH_TYPES,
+    _generate_uri,
+)
+
+
+class TOTP(object):
+    def __init__(
+        self,
+        key: bytes,
+        length: int,
+        algorithm: _ALLOWED_HASH_TYPES,
+        time_step: int,
+        backend: typing.Optional[Backend] = None,
+        enforce_key_length: bool = 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: typing.Union[int, float]) -> bytes:
+        counter = int(time / self._time_step)
+        return self._hotp.generate(counter)
+
+    def verify(self, totp: bytes, time: int) -> None:
+        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: str, issuer: typing.Optional[str]
+    ) -> str:
+        return _generate_uri(
+            self._hotp,
+            "totp",
+            account_name,
+            issuer,
+            [("period", int(self._time_step))],
+        )