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File Content: `randombytes.py`

# 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 nacl import exceptions as exc
from nacl._sodium import ffi, lib

randombytes_SEEDBYTES: int = lib.randombytes_seedbytes()


def randombytes(size: int) -> bytes:
    """
    Returns ``size`` number of random bytes from a cryptographically secure
    random source.

    :param size: int
    :rtype: bytes
    """
    buf = ffi.new("unsigned char[]", size)
    lib.randombytes(buf, size)
    return ffi.buffer(buf, size)[:]


def randombytes_buf_deterministic(size: int, seed: bytes) -> bytes:
    """
    Returns ``size`` number of deterministically generated pseudorandom bytes
    from a seed

    :param size: int
    :param seed: bytes
    :rtype: bytes
    """
    if len(seed) != randombytes_SEEDBYTES:
        raise exc.TypeError(
            "Deterministic random bytes must be generated from 32 bytes"
        )

    buf = ffi.new("unsigned char[]", size)
    lib.randombytes_buf_deterministic(buf, size, seed)
    return ffi.buffer(buf, size)[:]

Name	Size	Permission
__pycache__	---	0755
__init__.py	16997 bytes	0644
crypto_aead.py	15597 bytes	0644
crypto_box.py	10139 bytes	0644
crypto_core.py	13736 bytes	0644
crypto_generichash.py	8852 bytes	0644
crypto_hash.py	2175 bytes	0644
crypto_kx.py	6723 bytes	0644
crypto_pwhash.py	18848 bytes	0644
crypto_scalarmult.py	8244 bytes	0644
crypto_secretbox.py	2914 bytes	0644
crypto_secretstream.py	11165 bytes	0644
crypto_shorthash.py	2603 bytes	0644
crypto_sign.py	10342 bytes	0644
randombytes.py	1563 bytes	0644
sodium_core.py	1039 bytes	0644
utils.py	4298 bytes	0644

File Content: randombytes.py

File Content: `randombytes.py`