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randm.h
00001 /***************************************************************************** 00002 * randm.h - Random number generator header file. 00003 * 00004 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. 00005 * Copyright (c) 1998 Global Election Systems Inc. 00006 * 00007 * The authors hereby grant permission to use, copy, modify, distribute, 00008 * and license this software and its documentation for any purpose, provided 00009 * that existing copyright notices are retained in all copies and that this 00010 * notice and the following disclaimer are included verbatim in any 00011 * distributions. No written agreement, license, or royalty fee is required 00012 * for any of the authorized uses. 00013 * 00014 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR 00015 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00016 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 00017 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00018 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 00019 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00020 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00021 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00022 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 00023 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00024 * 00025 ****************************************************************************** 00026 * REVISION HISTORY 00027 * 00028 * 03-01-01 Marc Boucher <marc@mbsi.ca> 00029 * Ported to lwIP. 00030 * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc. 00031 * Extracted from avos. 00032 *****************************************************************************/ 00033 00034 #ifndef RANDM_H 00035 #define RANDM_H 00036 00037 /*********************** 00038 *** PUBLIC FUNCTIONS *** 00039 ***********************/ 00040 /* 00041 * Initialize the random number generator. 00042 */ 00043 void avRandomInit(void); 00044 00045 /* 00046 * Churn the randomness pool on a random event. Call this early and often 00047 * on random and semi-random system events to build randomness in time for 00048 * usage. For randomly timed events, pass a null pointer and a zero length 00049 * and this will use the system timer and other sources to add randomness. 00050 * If new random data is available, pass a pointer to that and it will be 00051 * included. 00052 */ 00053 void avChurnRand(char *randData, u32_t randLen); 00054 00055 /* 00056 * Randomize our random seed value. To be called for truely random events 00057 * such as user operations and network traffic. 00058 */ 00059 #if MD5_SUPPORT 00060 #define avRandomize() avChurnRand(NULL, 0) 00061 #else /* MD5_SUPPORT */ 00062 void avRandomize(void); 00063 #endif /* MD5_SUPPORT */ 00064 00065 /* 00066 * Use the random pool to generate random data. This degrades to pseudo 00067 * random when used faster than randomness is supplied using churnRand(). 00068 * Thus it's important to make sure that the results of this are not 00069 * published directly because one could predict the next result to at 00070 * least some degree. Also, it's important to get a good seed before 00071 * the first use. 00072 */ 00073 void avGenRand(char *buf, u32_t bufLen); 00074 00075 /* 00076 * Return a new random number. 00077 */ 00078 u32_t avRandom(void); 00079 00080 00081 #endif /* RANDM_H */
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