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
# limitations under the License.

from __future__ import absolute_import, division, print_function

import os

import six

import nacl.bindings
from nacl import encoding


[docs]class EncryptedMessage(bytes): """ A bytes subclass that holds a messaged that has been encrypted by a :class:`SecretBox`. """ @classmethod def _from_parts(cls, nonce, ciphertext, combined): obj = cls(combined) obj._nonce = nonce obj._ciphertext = ciphertext return obj @property def nonce(self): """ The nonce used during the encryption of the :class:`EncryptedMessage`. """ return self._nonce @property def ciphertext(self): """ The ciphertext contained within the :class:`EncryptedMessage`. """ return self._ciphertext
class StringFixer(object): def __str__(self): if six.PY3: return str(self.__bytes__()) else: return self.__bytes__() def bytes_as_string(bytes_in): if six.PY3: return bytes_in.decode("ascii") else: return bytes_in
[docs]def random(size=32): return os.urandom(size)
[docs]def randombytes_deterministic(size, seed, encoder=encoding.RawEncoder): """ 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)