NetBSD/crypto/dist/ssh/random.c

109 lines
3.1 KiB
C

/* $NetBSD: random.c,v 1.4 2001/02/14 04:46:58 itojun Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND 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 FOUNDATION OR 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: random.c,v 1.4 2001/02/14 04:46:58 itojun Exp $");
#endif
/*
* Functions for stirring in additional noise into the
* cryptographically strong PRNG.
* the functions are not using "arc4" in any ways, they are placed here
* to make porting easy.
*/
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <openssl/rand.h>
#include "includes.h"
#include "pathnames.h"
#include "random.h"
#include "log.h"
#define BUFSIZE 32
static const char *rndfail = "random number device is mandatory. see rnd(4).";
int
arc4random_check(void)
{
int fd;
fd = open(_PATH_URANDOM, O_RDONLY, 0666);
if (fd < 0) {
fatal(rndfail);
/*NOTREACHED*/
}
close(fd);
return 0;
}
void
arc4random_stir(void)
{
u_char buf[BUFSIZE];
ssize_t len;
int fd;
fd = open(_PATH_URANDOM, O_RDONLY, 0666);
if (fd != -1) {
len = read(fd, buf, sizeof(buf));
if (len != -1)
RAND_seed(buf, len);
(void) close(fd);
memset(buf, 0, sizeof(buf));
} else {
fatal(rndfail);
/*NOTREACHED*/
}
}
u_int32_t
arc4random(void)
{
u_int32_t v;
RAND_pseudo_bytes((u_char *)&v, sizeof(v));
return v;
}