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# 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

from nacl._sodium import ffi, lib


def randombytes(size):
    """
    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)[:]