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/*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Markus Friedl.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_STDDEF_H
#include <stddef.h>
#endif
#include "xmalloc.h"
#include "ssh.h"
#include "bsd-misc.h"
#include "entropy.h"
#ifndef HAVE_ARC4RANDOM
typedef struct
{
unsigned int s[256];
int i;
int j;
} rc4_t;
void rc4_key(rc4_t *r, unsigned char *key, int len);
void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
static rc4_t *rc4 = NULL;
void rc4_key(rc4_t *r, unsigned char *key, int len)
{
int t;
for(r->i = 0; r->i < 256; r->i++)
r->s[r->i] = r->i;
r->j = 0;
for(r->i = 0; r->i < 256; r->i++)
{
r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
t = r->s[r->i];
r->s[r->i] = r->s[r->j];
r->s[r->j] = t;
}
r->i = r->j = 0;
}
void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
{
int t;
int c;
c = 0;
while(c < len)
{
r->i = (r->i + 1) % 256;
r->j = (r->j + r->s[r->i]) % 256;
t = r->s[r->i];
r->s[r->i] = r->s[r->j];
r->s[r->j] = t;
t = (r->s[r->i] + r->s[r->j]) % 256;
buffer[c] = r->s[t];
c++;
}
}
unsigned int arc4random(void)
{
unsigned int r;
if (rc4 == NULL)
arc4random_stir();
rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
return(r);
}
void arc4random_stir(void)
{
unsigned char rand_buf[32];
if (rc4 == NULL)
rc4 = xmalloc(sizeof(*rc4));
seed_rng();
RAND_bytes(rand_buf, sizeof(rand_buf));
seed_rng();
rc4_key(rc4, rand_buf, sizeof(rand_buf));
memset(rand_buf, 0, sizeof(rand_buf));
}
#endif /* !HAVE_ARC4RANDOM */
#ifndef HAVE_SETPROCTITLE
void setproctitle(const char *fmt, ...)
{
/* FIXME */
}
#endif /* !HAVE_SETPROCTITLE */
#ifndef HAVE_SETLOGIN
int setlogin(const char *name)
{
return(0);
}
#endif /* !HAVE_SETLOGIN */
#ifndef HAVE_INNETGR
int innetgr(const char *netgroup, const char *host,
const char *user, const char *domain)
{
return(0);
}
#endif /* HAVE_INNETGR */
#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
int seteuid(uid_t euid)
{
return(setreuid(-1,euid));
}
#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */
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