[164] | 1 | /*****************************************************************************
|
---|
| 2 | * randm.h - Random number generator header file.
|
---|
| 3 | *
|
---|
| 4 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
|
---|
| 5 | * Copyright (c) 1998 Global Election Systems Inc.
|
---|
| 6 | *
|
---|
| 7 | * The authors hereby grant permission to use, copy, modify, distribute,
|
---|
| 8 | * and license this software and its documentation for any purpose, provided
|
---|
| 9 | * that existing copyright notices are retained in all copies and that this
|
---|
| 10 | * notice and the following disclaimer are included verbatim in any
|
---|
| 11 | * distributions. No written agreement, license, or royalty fee is required
|
---|
| 12 | * for any of the authorized uses.
|
---|
| 13 | *
|
---|
| 14 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
|
---|
| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
---|
| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
---|
| 17 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
---|
| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
---|
| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
---|
| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
---|
| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
---|
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
---|
| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
---|
| 24 | *
|
---|
| 25 | ******************************************************************************
|
---|
| 26 | * REVISION HISTORY
|
---|
| 27 | *
|
---|
| 28 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
|
---|
| 29 | * Ported to lwIP.
|
---|
| 30 | * 98-05-29 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
|
---|
| 31 | * Extracted from avos.
|
---|
| 32 | *****************************************************************************/
|
---|
| 33 |
|
---|
| 34 | #ifndef RANDM_H
|
---|
| 35 | #define RANDM_H
|
---|
| 36 |
|
---|
| 37 | /***********************
|
---|
| 38 | *** PUBLIC FUNCTIONS ***
|
---|
| 39 | ***********************/
|
---|
| 40 | /*
|
---|
| 41 | * Initialize the random number generator.
|
---|
| 42 | */
|
---|
| 43 | void avRandomInit(void);
|
---|
| 44 |
|
---|
| 45 | /*
|
---|
| 46 | * Churn the randomness pool on a random event. Call this early and often
|
---|
| 47 | * on random and semi-random system events to build randomness in time for
|
---|
| 48 | * usage. For randomly timed events, pass a null pointer and a zero length
|
---|
| 49 | * and this will use the system timer and other sources to add randomness.
|
---|
| 50 | * If new random data is available, pass a pointer to that and it will be
|
---|
| 51 | * included.
|
---|
| 52 | */
|
---|
| 53 | void avChurnRand(char *randData, u32_t randLen);
|
---|
| 54 |
|
---|
| 55 | /*
|
---|
| 56 | * Randomize our random seed value. To be called for truely random events
|
---|
| 57 | * such as user operations and network traffic.
|
---|
| 58 | */
|
---|
| 59 | #if MD5_SUPPORT
|
---|
| 60 | #define avRandomize() avChurnRand(NULL, 0)
|
---|
| 61 | #else /* MD5_SUPPORT */
|
---|
| 62 | void avRandomize(void);
|
---|
| 63 | #endif /* MD5_SUPPORT */
|
---|
| 64 |
|
---|
| 65 | /*
|
---|
| 66 | * Use the random pool to generate random data. This degrades to pseudo
|
---|
| 67 | * random when used faster than randomness is supplied using churnRand().
|
---|
| 68 | * Thus it's important to make sure that the results of this are not
|
---|
| 69 | * published directly because one could predict the next result to at
|
---|
| 70 | * least some degree. Also, it's important to get a good seed before
|
---|
| 71 | * the first use.
|
---|
| 72 | */
|
---|
| 73 | void avGenRand(char *buf, u32_t bufLen);
|
---|
| 74 |
|
---|
| 75 | /*
|
---|
| 76 | * Return a new random number.
|
---|
| 77 | */
|
---|
| 78 | u32_t avRandom(void);
|
---|
| 79 |
|
---|
| 80 |
|
---|
| 81 | #endif /* RANDM_H */
|
---|