85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
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/* $NetBSD: random.c,v 1.1.1.1 2000/09/28 22:10:08 thorpej Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: random.c,v 1.1.1.1 2000/09/28 22:10:08 thorpej Exp $");
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#endif
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/*
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* Functions for stirring in additional noise into the
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* cryptographically strong PRNG.
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <openssl/rand.h>
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#include "includes.h"
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#include "ssh.h"
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#include "pathnames.h"
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#define BUFSIZE 32
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void
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ssh_random_stir(void)
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{
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u_char buf[BUFSIZE];
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ssize_t len;
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int fd;
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fd = open(_PATH_URANDOM, O_RDONLY, 0666);
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if (fd != -1) {
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len = read(fd, buf, sizeof(buf));
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if (len != -1)
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RAND_seed(buf, len);
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(void) close(fd);
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memset(buf, 0, sizeof(buf));
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} else {
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/*
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* XXX We should stir in other environmental
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* XXX noise, here.
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*/
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RAND_pseudo_bytes(buf, sizeof(buf) >> 1);
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RAND_seed(buf, sizeof(buf) >> 1);
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}
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}
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