mirror of git://anongit.mindrot.org/openssh.git
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
|
|
* Copyright (c) 1999-2000 Damien Miller. All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "includes.h"
|
|
|
|
#ifndef HAVE_ARC4RANDOM
|
|
|
|
#include <openssl/rand.h>
|
|
#include <openssl/rc4.h>
|
|
|
|
/* Size of key to use */
|
|
#define SEED_SIZE 20
|
|
|
|
/* Number of bytes to reseed after */
|
|
#define REKEY_BYTES (1 << 24)
|
|
|
|
static int rc4_ready = 0;
|
|
static RC4_KEY rc4;
|
|
|
|
unsigned int arc4random(void)
|
|
{
|
|
unsigned int r = 0;
|
|
|
|
if (rc4_ready <= 0)
|
|
arc4random_stir();
|
|
|
|
RC4(&rc4, sizeof(r), (unsigned char *)&r, (unsigned char *)&r);
|
|
|
|
rc4_ready -= sizeof(r);
|
|
|
|
return(r);
|
|
}
|
|
|
|
void arc4random_stir(void)
|
|
{
|
|
unsigned char rand_buf[SEED_SIZE];
|
|
|
|
memset(&rc4, 0, sizeof(rc4));
|
|
|
|
seed_rng();
|
|
|
|
RAND_bytes(rand_buf, sizeof(rand_buf));
|
|
|
|
RC4_set_key(&rc4, sizeof(rand_buf), rand_buf);
|
|
|
|
memset(rand_buf, 0, sizeof(rand_buf));
|
|
|
|
rc4_ready = REKEY_BYTES;
|
|
}
|
|
#endif /* !HAVE_ARC4RANDOM */
|