Donatien Garnier / LwIPNetworking

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Dependencies:   DebugLib Socket lwip lwip-sys

Dependents:   EthernetInterface

Fork of NetworkingCoreLib by Donatien Garnier

main/lwip/src/netif/ppp/randm.h@0:013f5d54248c, 2012-05-24 (annotated)

Committer:
donatien
Date:
Thu May 24 14:49:40 2012 +0000
Revision:
0:013f5d54248c
Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:013f5d54248c 1 /*****************************************************************************
donatien 0:013f5d54248c 2 * randm.h - Random number generator header file.
donatien 0:013f5d54248c 3 *
donatien 0:013f5d54248c 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
donatien 0:013f5d54248c 5 * Copyright (c) 1998 Global Election Systems Inc.
donatien 0:013f5d54248c 6 *
donatien 0:013f5d54248c 7 * The authors hereby grant permission to use, copy, modify, distribute,
donatien 0:013f5d54248c 8 * and license this software and its documentation for any purpose, provided
donatien 0:013f5d54248c 9 * that existing copyright notices are retained in all copies and that this
donatien 0:013f5d54248c 10 * notice and the following disclaimer are included verbatim in any
donatien 0:013f5d54248c 11 * distributions. No written agreement, license, or royalty fee is required
donatien 0:013f5d54248c 12 * for any of the authorized uses.
donatien 0:013f5d54248c 13 *
donatien 0:013f5d54248c 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
donatien 0:013f5d54248c 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
donatien 0:013f5d54248c 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
donatien 0:013f5d54248c 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
donatien 0:013f5d54248c 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
donatien 0:013f5d54248c 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
donatien 0:013f5d54248c 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
donatien 0:013f5d54248c 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
donatien 0:013f5d54248c 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
donatien 0:013f5d54248c 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
donatien 0:013f5d54248c 24 *
donatien 0:013f5d54248c 25 ******************************************************************************
donatien 0:013f5d54248c 26 * REVISION HISTORY
donatien 0:013f5d54248c 27 *
donatien 0:013f5d54248c 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
donatien 0:013f5d54248c 29 * Ported to lwIP.
donatien 0:013f5d54248c 30 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
donatien 0:013f5d54248c 31 * Extracted from avos.
donatien 0:013f5d54248c 32 *****************************************************************************/
donatien 0:013f5d54248c 33
donatien 0:013f5d54248c 34 #ifndef RANDM_H
donatien 0:013f5d54248c 35 #define RANDM_H
donatien 0:013f5d54248c 36
donatien 0:013f5d54248c 37 /***********************
donatien 0:013f5d54248c 38 *** PUBLIC FUNCTIONS ***
donatien 0:013f5d54248c 39 ***********************/
donatien 0:013f5d54248c 40 /*
donatien 0:013f5d54248c 41 * Initialize the random number generator.
donatien 0:013f5d54248c 42 */
donatien 0:013f5d54248c 43 void avRandomInit(void);
donatien 0:013f5d54248c 44
donatien 0:013f5d54248c 45 /*
donatien 0:013f5d54248c 46 * Churn the randomness pool on a random event. Call this early and often
donatien 0:013f5d54248c 47 * on random and semi-random system events to build randomness in time for
donatien 0:013f5d54248c 48 * usage. For randomly timed events, pass a null pointer and a zero length
donatien 0:013f5d54248c 49 * and this will use the system timer and other sources to add randomness.
donatien 0:013f5d54248c 50 * If new random data is available, pass a pointer to that and it will be
donatien 0:013f5d54248c 51 * included.
donatien 0:013f5d54248c 52 */
donatien 0:013f5d54248c 53 void avChurnRand(char *randData, u32_t randLen);
donatien 0:013f5d54248c 54
donatien 0:013f5d54248c 55 /*
donatien 0:013f5d54248c 56 * Randomize our random seed value. To be called for truely random events
donatien 0:013f5d54248c 57 * such as user operations and network traffic.
donatien 0:013f5d54248c 58 */
donatien 0:013f5d54248c 59 #if MD5_SUPPORT
donatien 0:013f5d54248c 60 #define avRandomize() avChurnRand(NULL, 0)
donatien 0:013f5d54248c 61 #else /* MD5_SUPPORT */
donatien 0:013f5d54248c 62 void avRandomize(void);
donatien 0:013f5d54248c 63 #endif /* MD5_SUPPORT */
donatien 0:013f5d54248c 64
donatien 0:013f5d54248c 65 /*
donatien 0:013f5d54248c 66 * Use the random pool to generate random data. This degrades to pseudo
donatien 0:013f5d54248c 67 * random when used faster than randomness is supplied using churnRand().
donatien 0:013f5d54248c 68 * Thus it's important to make sure that the results of this are not
donatien 0:013f5d54248c 69 * published directly because one could predict the next result to at
donatien 0:013f5d54248c 70 * least some degree. Also, it's important to get a good seed before
donatien 0:013f5d54248c 71 * the first use.
donatien 0:013f5d54248c 72 */
donatien 0:013f5d54248c 73 void avGenRand(char *buf, u32_t bufLen);
donatien 0:013f5d54248c 74
donatien 0:013f5d54248c 75 /*
donatien 0:013f5d54248c 76 * Return a new random number.
donatien 0:013f5d54248c 77 */
donatien 0:013f5d54248c 78 u32_t avRandom(void);
donatien 0:013f5d54248c 79
donatien 0:013f5d54248c 80
donatien 0:013f5d54248c 81 #endif /* RANDM_H */