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