mbedtls/doxygen/input/doc_rng.h

/**
 * @file
 * Random number generator (RNG) module documentation file.
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 *
 *  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 ctr_dbrg_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.
 */