82 lines
3.1 KiB
C
82 lines
3.1 KiB
C
|
/*****************************************************************************
|
||
|
|
* 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 */
|