source: UsbWattMeter/trunk/lwip-1.4.1/src/netif/ppp/randm.h@ 164

Last change on this file since 164 was 164, checked in by coas-nagasima, 6 years ago

TOPPERS/ECNLサンプルアプリ「USB充電器電力計」を追加

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
  • Property svn:mime-type set to text/x-chdr
File size: 3.1 KB
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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 */
43void 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 */
53void 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 */
62void 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 */
73void avGenRand(char *buf, u32_t bufLen);
74
75/*
76 * Return a new random number.
77 */
78u32_t avRandom(void);
79
80
81#endif /* RANDM_H */
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