/****************************************************************************** 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 <marc@mbsi.ca>*   Ported to lwIP.* 98-05-29 Guy Lancaster <glanca@gesn.com>, 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)#elsevoid 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);#endif /* RANDM_H */