| /***************************************************************************** |
| * 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) |
| #else /* MD5_SUPPORT */ |
| void avRandomize(void); |
| #endif /* MD5_SUPPORT */ |
| |
| /* |
| * 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 */ |
