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NetServices/lwip/netif/ppp/randm.h@0:05ccbd4f84f1, 2013-12-02 (annotated)

Committer:
hendrikvincent
Date:
Mon Dec 02 09:01:23 2013 +0000
Revision:
0:05ccbd4f84f1
eerste programma;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hendrikvincent 0:05ccbd4f84f1 1 /*****************************************************************************
hendrikvincent 0:05ccbd4f84f1 2 * randm.h - Random number generator header file.
hendrikvincent 0:05ccbd4f84f1 3 *
hendrikvincent 0:05ccbd4f84f1 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
hendrikvincent 0:05ccbd4f84f1 5 * Copyright (c) 1998 Global Election Systems Inc.
hendrikvincent 0:05ccbd4f84f1 6 *
hendrikvincent 0:05ccbd4f84f1 7 * The authors hereby grant permission to use, copy, modify, distribute,
hendrikvincent 0:05ccbd4f84f1 8 * and license this software and its documentation for any purpose, provided
hendrikvincent 0:05ccbd4f84f1 9 * that existing copyright notices are retained in all copies and that this
hendrikvincent 0:05ccbd4f84f1 10 * notice and the following disclaimer are included verbatim in any
hendrikvincent 0:05ccbd4f84f1 11 * distributions. No written agreement, license, or royalty fee is required
hendrikvincent 0:05ccbd4f84f1 12 * for any of the authorized uses.
hendrikvincent 0:05ccbd4f84f1 13 *
hendrikvincent 0:05ccbd4f84f1 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
hendrikvincent 0:05ccbd4f84f1 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
hendrikvincent 0:05ccbd4f84f1 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
hendrikvincent 0:05ccbd4f84f1 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
hendrikvincent 0:05ccbd4f84f1 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
hendrikvincent 0:05ccbd4f84f1 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
hendrikvincent 0:05ccbd4f84f1 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
hendrikvincent 0:05ccbd4f84f1 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
hendrikvincent 0:05ccbd4f84f1 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
hendrikvincent 0:05ccbd4f84f1 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
hendrikvincent 0:05ccbd4f84f1 24 *
hendrikvincent 0:05ccbd4f84f1 25 ******************************************************************************
hendrikvincent 0:05ccbd4f84f1 26 * REVISION HISTORY
hendrikvincent 0:05ccbd4f84f1 27 *
hendrikvincent 0:05ccbd4f84f1 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
hendrikvincent 0:05ccbd4f84f1 29 * Ported to lwIP.
hendrikvincent 0:05ccbd4f84f1 30 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
hendrikvincent 0:05ccbd4f84f1 31 * Extracted from avos.
hendrikvincent 0:05ccbd4f84f1 32 *****************************************************************************/
hendrikvincent 0:05ccbd4f84f1 33
hendrikvincent 0:05ccbd4f84f1 34 #ifndef RANDM_H
hendrikvincent 0:05ccbd4f84f1 35 #define RANDM_H
hendrikvincent 0:05ccbd4f84f1 36
hendrikvincent 0:05ccbd4f84f1 37 /***********************
hendrikvincent 0:05ccbd4f84f1 38 *** PUBLIC FUNCTIONS ***
hendrikvincent 0:05ccbd4f84f1 39 ***********************/
hendrikvincent 0:05ccbd4f84f1 40 /*
hendrikvincent 0:05ccbd4f84f1 41 * Initialize the random number generator.
hendrikvincent 0:05ccbd4f84f1 42 */
hendrikvincent 0:05ccbd4f84f1 43 void avRandomInit(void);
hendrikvincent 0:05ccbd4f84f1 44
hendrikvincent 0:05ccbd4f84f1 45 /*
hendrikvincent 0:05ccbd4f84f1 46 * Churn the randomness pool on a random event. Call this early and often
hendrikvincent 0:05ccbd4f84f1 47 * on random and semi-random system events to build randomness in time for
hendrikvincent 0:05ccbd4f84f1 48 * usage. For randomly timed events, pass a null pointer and a zero length
hendrikvincent 0:05ccbd4f84f1 49 * and this will use the system timer and other sources to add randomness.
hendrikvincent 0:05ccbd4f84f1 50 * If new random data is available, pass a pointer to that and it will be
hendrikvincent 0:05ccbd4f84f1 51 * included.
hendrikvincent 0:05ccbd4f84f1 52 */
hendrikvincent 0:05ccbd4f84f1 53 void avChurnRand(char *randData, u32_t randLen);
hendrikvincent 0:05ccbd4f84f1 54
hendrikvincent 0:05ccbd4f84f1 55 /*
hendrikvincent 0:05ccbd4f84f1 56 * Randomize our random seed value. To be called for truely random events
hendrikvincent 0:05ccbd4f84f1 57 * such as user operations and network traffic.
hendrikvincent 0:05ccbd4f84f1 58 */
hendrikvincent 0:05ccbd4f84f1 59 #if MD5_SUPPORT
hendrikvincent 0:05ccbd4f84f1 60 #define avRandomize() avChurnRand(NULL, 0)
hendrikvincent 0:05ccbd4f84f1 61 #else /* MD5_SUPPORT */
hendrikvincent 0:05ccbd4f84f1 62 void avRandomize(void);
hendrikvincent 0:05ccbd4f84f1 63 #endif /* MD5_SUPPORT */
hendrikvincent 0:05ccbd4f84f1 64
hendrikvincent 0:05ccbd4f84f1 65 /*
hendrikvincent 0:05ccbd4f84f1 66 * Use the random pool to generate random data. This degrades to pseudo
hendrikvincent 0:05ccbd4f84f1 67 * random when used faster than randomness is supplied using churnRand().
hendrikvincent 0:05ccbd4f84f1 68 * Thus it's important to make sure that the results of this are not
hendrikvincent 0:05ccbd4f84f1 69 * published directly because one could predict the next result to at
hendrikvincent 0:05ccbd4f84f1 70 * least some degree. Also, it's important to get a good seed before
hendrikvincent 0:05ccbd4f84f1 71 * the first use.
hendrikvincent 0:05ccbd4f84f1 72 */
hendrikvincent 0:05ccbd4f84f1 73 void avGenRand(char *buf, u32_t bufLen);
hendrikvincent 0:05ccbd4f84f1 74
hendrikvincent 0:05ccbd4f84f1 75 /*
hendrikvincent 0:05ccbd4f84f1 76 * Return a new random number.
hendrikvincent 0:05ccbd4f84f1 77 */
hendrikvincent 0:05ccbd4f84f1 78 u32_t avRandom(void);
hendrikvincent 0:05ccbd4f84f1 79
hendrikvincent 0:05ccbd4f84f1 80
hendrikvincent 0:05ccbd4f84f1 81 #endif /* RANDM_H */