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