/***************************************************************************** * randm.h - Random number generator header file. * * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. * Copyright (c) 1998 Global Election Systems Inc. * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice and the following disclaimer are included verbatim in any * distributions. No written agreement, license, or royalty fee is required * for any of the authorized uses. * * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** * REVISION HISTORY * * 03-01-01 Marc Boucher * Ported to lwIP. * 98-05-29 Guy Lancaster , Global Election Systems Inc. * Extracted from avos. *****************************************************************************/ #ifndef RANDM_H #define RANDM_H /*********************** *** PUBLIC FUNCTIONS *** ***********************/ /* * Initialize the random number generator. */ void avRandomInit(void); /* * Churn the randomness pool on a random event. Call this early and often * on random and semi-random system events to build randomness in time for * usage. For randomly timed events, pass a null pointer and a zero length * and this will use the system timer and other sources to add randomness. * If new random data is available, pass a pointer to that and it will be * included. */ void avChurnRand(char *randData, u32_t randLen); /* * Randomize our random seed value. To be called for truely random events * such as user operations and network traffic. */ #if MD5_SUPPORT #define avRandomize() avChurnRand(NULL, 0) #else void avRandomize(void); #endif /* * Use the random pool to generate random data. This degrades to pseudo * random when used faster than randomness is supplied using churnRand(). * Thus it's important to make sure that the results of this are not * published directly because one could predict the next result to at * least some degree. Also, it's important to get a good seed before * the first use. */ void avGenRand(char *buf, u32_t bufLen); /* * Return a new random number. */ u32_t avRandom(void); /* * Initialize Borland's random number generator. This is a library function * but we declare it here rather than including the entire header file * for it. */ //void srand(unsigned seed); #endif /* RANDM_H */