71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* $KAME: arc4random.c,v 1.1 2002/06/04 05:20:27 itojun Exp $ */
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/*
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* Copyright (C) 2000 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* a stub function to make random() to return good random numbers.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: arc4random.c,v 1.2 2003/07/12 09:37:13 itojun Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#include "arc4random.h"
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static int fd = -1;
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static void
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arc4random_init()
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{
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fd = open("/dev/urandom", O_RDONLY, 0600);
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if (fd < 0) {
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err(1, "/dev/urandom");
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/*NOTREACHED*/
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}
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}
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u_int32_t
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arc4random()
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{
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u_int32_t v;
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if (fd < 0)
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arc4random_init();
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read(fd, &v, sizeof(v));
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return v;
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}
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