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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 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)[:]
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