Source code for nacl.utils

# Copyright 2013 Donald Stufft and individual contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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import os
from typing import SupportsBytes, Type, TypeVar

import nacl.bindings
from nacl import encoding

_EncryptedMessage = TypeVar("_EncryptedMessage", bound="EncryptedMessage")


[docs]class EncryptedMessage(bytes): """ A bytes subclass that holds a messaged that has been encrypted by a :class:`SecretBox`. """ _nonce: bytes _ciphertext: bytes @classmethod def _from_parts( cls: Type[_EncryptedMessage], nonce: bytes, ciphertext: bytes, combined: bytes, ) -> _EncryptedMessage: obj = cls(combined) obj._nonce = nonce obj._ciphertext = ciphertext return obj @property def nonce(self) -> bytes: """ The nonce used during the encryption of the :class:`EncryptedMessage`. """ return self._nonce @property def ciphertext(self) -> bytes: """ The ciphertext contained within the :class:`EncryptedMessage`. """ return self._ciphertext
class StringFixer: def __str__(self: SupportsBytes) -> str: return str(self.__bytes__()) def bytes_as_string(bytes_in: bytes) -> str: return bytes_in.decode("ascii")
[docs]def random(size: int = 32) -> bytes: return os.urandom(size)
[docs]def randombytes_deterministic( size: int, seed: bytes, encoder: encoding.Encoder = encoding.RawEncoder ) -> bytes: """ Returns ``size`` number of deterministically generated pseudorandom bytes from a seed :param size: int :param seed: bytes :param encoder: The encoder class used to encode the produced bytes :rtype: bytes """ raw_data = nacl.bindings.randombytes_buf_deterministic(size, seed) return encoder.encode(raw_data)