/**
 * \file doc_rng.h
 *
 * \brief Random number generator (RNG) module documentation file.
 */
/*
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 2.0:
 *
 *  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.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  **********
 */

/**
 * @addtogroup rng_module Random number generator (RNG) module
 *
 * The Random number generator (RNG) module provides random number
 * generation, see \c mbedtls_ctr_drbg_random().
 *
 * The block-cipher counter-mode based deterministic random
 * bit generator (CTR_DBRG) as specified in NIST SP800-90. It needs an external
 * source of entropy. For these purposes \c mbedtls_entropy_func() can be used.
 * This is an implementation based on a simple entropy accumulator design.
 *
 * The other number generator that is included is less strong and uses the
 * HAVEGE (HArdware Volatile Entropy Gathering and Expansion) software heuristic
 * which considered unsafe for primary usage, but provides additional random
 * to the entropy pool if enables.
 *
 * Meaning that there seems to be no practical algorithm that can guess
 * the next bit with a probability larger than 1/2 in an output sequence.
 *
 * This module can be used to generate random numbers.
 */