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Dependencies:   TextLCD mbed

EthernetNetIf/LPC1768/lwip/netif/ppp/randm.h@0:66c7c9c4f765, 2012-08-31 (annotated)

Committer:
nxpfan
Date:
Fri Aug 31 08:19:51 2012 +0000
Revision:
0:66c7c9c4f765
version with newer libraries

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nxpfan 0:66c7c9c4f765 1 /*****************************************************************************
nxpfan 0:66c7c9c4f765 2 * randm.h - Random number generator header file.
nxpfan 0:66c7c9c4f765 3 *
nxpfan 0:66c7c9c4f765 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
nxpfan 0:66c7c9c4f765 5 * Copyright (c) 1998 Global Election Systems Inc.
nxpfan 0:66c7c9c4f765 6 *
nxpfan 0:66c7c9c4f765 7 * The authors hereby grant permission to use, copy, modify, distribute,
nxpfan 0:66c7c9c4f765 8 * and license this software and its documentation for any purpose, provided
nxpfan 0:66c7c9c4f765 9 * that existing copyright notices are retained in all copies and that this
nxpfan 0:66c7c9c4f765 10 * notice and the following disclaimer are included verbatim in any
nxpfan 0:66c7c9c4f765 11 * distributions. No written agreement, license, or royalty fee is required
nxpfan 0:66c7c9c4f765 12 * for any of the authorized uses.
nxpfan 0:66c7c9c4f765 13 *
nxpfan 0:66c7c9c4f765 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
nxpfan 0:66c7c9c4f765 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
nxpfan 0:66c7c9c4f765 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
nxpfan 0:66c7c9c4f765 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
nxpfan 0:66c7c9c4f765 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
nxpfan 0:66c7c9c4f765 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nxpfan 0:66c7c9c4f765 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nxpfan 0:66c7c9c4f765 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nxpfan 0:66c7c9c4f765 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
nxpfan 0:66c7c9c4f765 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nxpfan 0:66c7c9c4f765 24 *
nxpfan 0:66c7c9c4f765 25 ******************************************************************************
nxpfan 0:66c7c9c4f765 26 * REVISION HISTORY
nxpfan 0:66c7c9c4f765 27 *
nxpfan 0:66c7c9c4f765 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
nxpfan 0:66c7c9c4f765 29 * Ported to lwIP.
nxpfan 0:66c7c9c4f765 30 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
nxpfan 0:66c7c9c4f765 31 * Extracted from avos.
nxpfan 0:66c7c9c4f765 32 *****************************************************************************/
nxpfan 0:66c7c9c4f765 33
nxpfan 0:66c7c9c4f765 34 #ifndef RANDM_H
nxpfan 0:66c7c9c4f765 35 #define RANDM_H
nxpfan 0:66c7c9c4f765 36
nxpfan 0:66c7c9c4f765 37 /***********************
nxpfan 0:66c7c9c4f765 38 *** PUBLIC FUNCTIONS ***
nxpfan 0:66c7c9c4f765 39 ***********************/
nxpfan 0:66c7c9c4f765 40 /*
nxpfan 0:66c7c9c4f765 41 * Initialize the random number generator.
nxpfan 0:66c7c9c4f765 42 */
nxpfan 0:66c7c9c4f765 43 void avRandomInit(void);
nxpfan 0:66c7c9c4f765 44
nxpfan 0:66c7c9c4f765 45 /*
nxpfan 0:66c7c9c4f765 46 * Churn the randomness pool on a random event. Call this early and often
nxpfan 0:66c7c9c4f765 47 * on random and semi-random system events to build randomness in time for
nxpfan 0:66c7c9c4f765 48 * usage. For randomly timed events, pass a null pointer and a zero length
nxpfan 0:66c7c9c4f765 49 * and this will use the system timer and other sources to add randomness.
nxpfan 0:66c7c9c4f765 50 * If new random data is available, pass a pointer to that and it will be
nxpfan 0:66c7c9c4f765 51 * included.
nxpfan 0:66c7c9c4f765 52 */
nxpfan 0:66c7c9c4f765 53 void avChurnRand(char *randData, u32_t randLen);
nxpfan 0:66c7c9c4f765 54
nxpfan 0:66c7c9c4f765 55 /*
nxpfan 0:66c7c9c4f765 56 * Randomize our random seed value. To be called for truely random events
nxpfan 0:66c7c9c4f765 57 * such as user operations and network traffic.
nxpfan 0:66c7c9c4f765 58 */
nxpfan 0:66c7c9c4f765 59 #if MD5_SUPPORT
nxpfan 0:66c7c9c4f765 60 #define avRandomize() avChurnRand(NULL, 0)
nxpfan 0:66c7c9c4f765 61 #else /* MD5_SUPPORT */
nxpfan 0:66c7c9c4f765 62 void avRandomize(void);
nxpfan 0:66c7c9c4f765 63 #endif /* MD5_SUPPORT */
nxpfan 0:66c7c9c4f765 64
nxpfan 0:66c7c9c4f765 65 /*
nxpfan 0:66c7c9c4f765 66 * Use the random pool to generate random data. This degrades to pseudo
nxpfan 0:66c7c9c4f765 67 * random when used faster than randomness is supplied using churnRand().
nxpfan 0:66c7c9c4f765 68 * Thus it's important to make sure that the results of this are not
nxpfan 0:66c7c9c4f765 69 * published directly because one could predict the next result to at
nxpfan 0:66c7c9c4f765 70 * least some degree. Also, it's important to get a good seed before
nxpfan 0:66c7c9c4f765 71 * the first use.
nxpfan 0:66c7c9c4f765 72 */
nxpfan 0:66c7c9c4f765 73 void avGenRand(char *buf, u32_t bufLen);
nxpfan 0:66c7c9c4f765 74
nxpfan 0:66c7c9c4f765 75 /*
nxpfan 0:66c7c9c4f765 76 * Return a new random number.
nxpfan 0:66c7c9c4f765 77 */
nxpfan 0:66c7c9c4f765 78 u32_t avRandom(void);
nxpfan 0:66c7c9c4f765 79
nxpfan 0:66c7c9c4f765 80
nxpfan 0:66c7c9c4f765 81 #endif /* RANDM_H */