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lwip/netif/ppp/randm.h@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /*****************************************************************************
grzemich 0:d7bd7384a37c 2 * randm.h - Random number generator header file.
grzemich 0:d7bd7384a37c 3 *
grzemich 0:d7bd7384a37c 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
grzemich 0:d7bd7384a37c 5 * Copyright (c) 1998 Global Election Systems Inc.
grzemich 0:d7bd7384a37c 6 *
grzemich 0:d7bd7384a37c 7 * The authors hereby grant permission to use, copy, modify, distribute,
grzemich 0:d7bd7384a37c 8 * and license this software and its documentation for any purpose, provided
grzemich 0:d7bd7384a37c 9 * that existing copyright notices are retained in all copies and that this
grzemich 0:d7bd7384a37c 10 * notice and the following disclaimer are included verbatim in any
grzemich 0:d7bd7384a37c 11 * distributions. No written agreement, license, or royalty fee is required
grzemich 0:d7bd7384a37c 12 * for any of the authorized uses.
grzemich 0:d7bd7384a37c 13 *
grzemich 0:d7bd7384a37c 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
grzemich 0:d7bd7384a37c 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
grzemich 0:d7bd7384a37c 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
grzemich 0:d7bd7384a37c 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
grzemich 0:d7bd7384a37c 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
grzemich 0:d7bd7384a37c 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
grzemich 0:d7bd7384a37c 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
grzemich 0:d7bd7384a37c 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
grzemich 0:d7bd7384a37c 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
grzemich 0:d7bd7384a37c 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
grzemich 0:d7bd7384a37c 24 *
grzemich 0:d7bd7384a37c 25 ******************************************************************************
grzemich 0:d7bd7384a37c 26 * REVISION HISTORY
grzemich 0:d7bd7384a37c 27 *
grzemich 0:d7bd7384a37c 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
grzemich 0:d7bd7384a37c 29 * Ported to lwIP.
grzemich 0:d7bd7384a37c 30 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
grzemich 0:d7bd7384a37c 31 * Extracted from avos.
grzemich 0:d7bd7384a37c 32 *****************************************************************************/
grzemich 0:d7bd7384a37c 33
grzemich 0:d7bd7384a37c 34 #ifndef RANDM_H
grzemich 0:d7bd7384a37c 35 #define RANDM_H
grzemich 0:d7bd7384a37c 36
grzemich 0:d7bd7384a37c 37 /***********************
grzemich 0:d7bd7384a37c 38 *** PUBLIC FUNCTIONS ***
grzemich 0:d7bd7384a37c 39 ***********************/
grzemich 0:d7bd7384a37c 40 /*
grzemich 0:d7bd7384a37c 41 * Initialize the random number generator.
grzemich 0:d7bd7384a37c 42 */
grzemich 0:d7bd7384a37c 43 void avRandomInit(void);
grzemich 0:d7bd7384a37c 44
grzemich 0:d7bd7384a37c 45 /*
grzemich 0:d7bd7384a37c 46 * Churn the randomness pool on a random event. Call this early and often
grzemich 0:d7bd7384a37c 47 * on random and semi-random system events to build randomness in time for
grzemich 0:d7bd7384a37c 48 * usage. For randomly timed events, pass a null pointer and a zero length
grzemich 0:d7bd7384a37c 49 * and this will use the system timer and other sources to add randomness.
grzemich 0:d7bd7384a37c 50 * If new random data is available, pass a pointer to that and it will be
grzemich 0:d7bd7384a37c 51 * included.
grzemich 0:d7bd7384a37c 52 */
grzemich 0:d7bd7384a37c 53 void avChurnRand(char *randData, u32_t randLen);
grzemich 0:d7bd7384a37c 54
grzemich 0:d7bd7384a37c 55 /*
grzemich 0:d7bd7384a37c 56 * Randomize our random seed value. To be called for truely random events
grzemich 0:d7bd7384a37c 57 * such as user operations and network traffic.
grzemich 0:d7bd7384a37c 58 */
grzemich 0:d7bd7384a37c 59 #if MD5_SUPPORT
grzemich 0:d7bd7384a37c 60 #define avRandomize() avChurnRand(NULL, 0)
grzemich 0:d7bd7384a37c 61 #else /* MD5_SUPPORT */
grzemich 0:d7bd7384a37c 62 void avRandomize(void);
grzemich 0:d7bd7384a37c 63 #endif /* MD5_SUPPORT */
grzemich 0:d7bd7384a37c 64
grzemich 0:d7bd7384a37c 65 /*
grzemich 0:d7bd7384a37c 66 * Use the random pool to generate random data. This degrades to pseudo
grzemich 0:d7bd7384a37c 67 * random when used faster than randomness is supplied using churnRand().
grzemich 0:d7bd7384a37c 68 * Thus it's important to make sure that the results of this are not
grzemich 0:d7bd7384a37c 69 * published directly because one could predict the next result to at
grzemich 0:d7bd7384a37c 70 * least some degree. Also, it's important to get a good seed before
grzemich 0:d7bd7384a37c 71 * the first use.
grzemich 0:d7bd7384a37c 72 */
grzemich 0:d7bd7384a37c 73 void avGenRand(char *buf, u32_t bufLen);
grzemich 0:d7bd7384a37c 74
grzemich 0:d7bd7384a37c 75 /*
grzemich 0:d7bd7384a37c 76 * Return a new random number.
grzemich 0:d7bd7384a37c 77 */
grzemich 0:d7bd7384a37c 78 u32_t avRandom(void);
grzemich 0:d7bd7384a37c 79
grzemich 0:d7bd7384a37c 80
grzemich 0:d7bd7384a37c 81 #endif /* RANDM_H */