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netif/ppp/randm.h@0:51ac1d130fd4, 2012-06-22 (annotated)

Committer:
mbed_official
Date:
Fri Jun 22 09:25:39 2012 +0000
Revision:
0:51ac1d130fd4
Initial import from lwip-1.4.0: http://download.savannah.gnu.org/releases/lwip/lwip-1.4.0.zip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /*****************************************************************************
mbed_official 0:51ac1d130fd4 2 * randm.h - Random number generator header file.
mbed_official 0:51ac1d130fd4 3 *
mbed_official 0:51ac1d130fd4 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
mbed_official 0:51ac1d130fd4 5 * Copyright (c) 1998 Global Election Systems Inc.
mbed_official 0:51ac1d130fd4 6 *
mbed_official 0:51ac1d130fd4 7 * The authors hereby grant permission to use, copy, modify, distribute,
mbed_official 0:51ac1d130fd4 8 * and license this software and its documentation for any purpose, provided
mbed_official 0:51ac1d130fd4 9 * that existing copyright notices are retained in all copies and that this
mbed_official 0:51ac1d130fd4 10 * notice and the following disclaimer are included verbatim in any
mbed_official 0:51ac1d130fd4 11 * distributions. No written agreement, license, or royalty fee is required
mbed_official 0:51ac1d130fd4 12 * for any of the authorized uses.
mbed_official 0:51ac1d130fd4 13 *
mbed_official 0:51ac1d130fd4 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
mbed_official 0:51ac1d130fd4 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
mbed_official 0:51ac1d130fd4 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
mbed_official 0:51ac1d130fd4 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mbed_official 0:51ac1d130fd4 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
mbed_official 0:51ac1d130fd4 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
mbed_official 0:51ac1d130fd4 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
mbed_official 0:51ac1d130fd4 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
mbed_official 0:51ac1d130fd4 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
mbed_official 0:51ac1d130fd4 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 24 *
mbed_official 0:51ac1d130fd4 25 ******************************************************************************
mbed_official 0:51ac1d130fd4 26 * REVISION HISTORY
mbed_official 0:51ac1d130fd4 27 *
mbed_official 0:51ac1d130fd4 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
mbed_official 0:51ac1d130fd4 29 * Ported to lwIP.
mbed_official 0:51ac1d130fd4 30 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
mbed_official 0:51ac1d130fd4 31 * Extracted from avos.
mbed_official 0:51ac1d130fd4 32 *****************************************************************************/
mbed_official 0:51ac1d130fd4 33
mbed_official 0:51ac1d130fd4 34 #ifndef RANDM_H
mbed_official 0:51ac1d130fd4 35 #define RANDM_H
mbed_official 0:51ac1d130fd4 36
mbed_official 0:51ac1d130fd4 37 /***********************
mbed_official 0:51ac1d130fd4 38 *** PUBLIC FUNCTIONS ***
mbed_official 0:51ac1d130fd4 39 ***********************/
mbed_official 0:51ac1d130fd4 40 /*
mbed_official 0:51ac1d130fd4 41 * Initialize the random number generator.
mbed_official 0:51ac1d130fd4 42 */
mbed_official 0:51ac1d130fd4 43 void avRandomInit(void);
mbed_official 0:51ac1d130fd4 44
mbed_official 0:51ac1d130fd4 45 /*
mbed_official 0:51ac1d130fd4 46 * Churn the randomness pool on a random event. Call this early and often
mbed_official 0:51ac1d130fd4 47 * on random and semi-random system events to build randomness in time for
mbed_official 0:51ac1d130fd4 48 * usage. For randomly timed events, pass a null pointer and a zero length
mbed_official 0:51ac1d130fd4 49 * and this will use the system timer and other sources to add randomness.
mbed_official 0:51ac1d130fd4 50 * If new random data is available, pass a pointer to that and it will be
mbed_official 0:51ac1d130fd4 51 * included.
mbed_official 0:51ac1d130fd4 52 */
mbed_official 0:51ac1d130fd4 53 void avChurnRand(char *randData, u32_t randLen);
mbed_official 0:51ac1d130fd4 54
mbed_official 0:51ac1d130fd4 55 /*
mbed_official 0:51ac1d130fd4 56 * Randomize our random seed value. To be called for truely random events
mbed_official 0:51ac1d130fd4 57 * such as user operations and network traffic.
mbed_official 0:51ac1d130fd4 58 */
mbed_official 0:51ac1d130fd4 59 #if MD5_SUPPORT
mbed_official 0:51ac1d130fd4 60 #define avRandomize() avChurnRand(NULL, 0)
mbed_official 0:51ac1d130fd4 61 #else /* MD5_SUPPORT */
mbed_official 0:51ac1d130fd4 62 void avRandomize(void);
mbed_official 0:51ac1d130fd4 63 #endif /* MD5_SUPPORT */
mbed_official 0:51ac1d130fd4 64
mbed_official 0:51ac1d130fd4 65 /*
mbed_official 0:51ac1d130fd4 66 * Use the random pool to generate random data. This degrades to pseudo
mbed_official 0:51ac1d130fd4 67 * random when used faster than randomness is supplied using churnRand().
mbed_official 0:51ac1d130fd4 68 * Thus it's important to make sure that the results of this are not
mbed_official 0:51ac1d130fd4 69 * published directly because one could predict the next result to at
mbed_official 0:51ac1d130fd4 70 * least some degree. Also, it's important to get a good seed before
mbed_official 0:51ac1d130fd4 71 * the first use.
mbed_official 0:51ac1d130fd4 72 */
mbed_official 0:51ac1d130fd4 73 void avGenRand(char *buf, u32_t bufLen);
mbed_official 0:51ac1d130fd4 74
mbed_official 0:51ac1d130fd4 75 /*
mbed_official 0:51ac1d130fd4 76 * Return a new random number.
mbed_official 0:51ac1d130fd4 77 */
mbed_official 0:51ac1d130fd4 78 u32_t avRandom(void);
mbed_official 0:51ac1d130fd4 79
mbed_official 0:51ac1d130fd4 80
mbed_official 0:51ac1d130fd4 81 #endif /* RANDM_H */