Diff: src/netif/ppp/randm.h

Revision:

0:8e01dca41002

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/netif/ppp/randm.h	Thu May 24 15:53:48 2012 +0000
@@ -0,0 +1,81 @@
+/*****************************************************************************
+* 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 */