160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/*
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* Copyright (c) 1999-2000 Damien Miller. 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. 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 Markus Friedl.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_STDDEF_H
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#include <stddef.h>
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#endif
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#include "xmalloc.h"
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#include "ssh.h"
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#include "bsd-misc.h"
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#include "entropy.h"
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#include <openssl/rand.h>
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#ifndef HAVE_ARC4RANDOM
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typedef struct
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{
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unsigned int s[256];
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int i;
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int j;
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} rc4_t;
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void rc4_key(rc4_t *r, unsigned char *key, int len);
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void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len);
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static rc4_t *rc4 = NULL;
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void rc4_key(rc4_t *r, unsigned char *key, int len)
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{
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int t;
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for(r->i = 0; r->i < 256; r->i++)
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r->s[r->i] = r->i;
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r->j = 0;
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for(r->i = 0; r->i < 256; r->i++)
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{
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r->j = (r->j + r->s[r->i] + key[r->i % len]) % 256;
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t = r->s[r->i];
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r->s[r->i] = r->s[r->j];
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r->s[r->j] = t;
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}
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r->i = r->j = 0;
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}
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void rc4_getbytes(rc4_t *r, unsigned char *buffer, int len)
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{
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int t;
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int c;
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c = 0;
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while(c < len)
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{
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r->i = (r->i + 1) % 256;
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r->j = (r->j + r->s[r->i]) % 256;
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t = r->s[r->i];
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r->s[r->i] = r->s[r->j];
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r->s[r->j] = t;
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t = (r->s[r->i] + r->s[r->j]) % 256;
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buffer[c] = r->s[t];
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c++;
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}
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}
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unsigned int arc4random(void)
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{
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unsigned int r;
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if (rc4 == NULL)
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arc4random_stir();
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rc4_getbytes(rc4, (unsigned char *)&r, sizeof(r));
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return(r);
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}
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void arc4random_stir(void)
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{
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unsigned char rand_buf[32];
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if (rc4 == NULL)
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rc4 = xmalloc(sizeof(*rc4));
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seed_rng();
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RAND_bytes(rand_buf, sizeof(rand_buf));
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rc4_key(rc4, rand_buf, sizeof(rand_buf));
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memset(rand_buf, 0, sizeof(rand_buf));
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}
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#endif /* !HAVE_ARC4RANDOM */
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#ifndef HAVE_SETPROCTITLE
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void setproctitle(const char *fmt, ...)
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{
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/* FIXME */
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}
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#endif /* !HAVE_SETPROCTITLE */
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#ifndef HAVE_SETLOGIN
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int setlogin(const char *name)
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{
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return(0);
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}
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#endif /* !HAVE_SETLOGIN */
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#ifndef HAVE_INNETGR
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int innetgr(const char *netgroup, const char *host,
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const char *user, const char *domain)
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{
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return(0);
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}
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#endif /* HAVE_INNETGR */
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#if !defined(HAVE_SETEUID) && defined(HAVE_SETREUID)
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int seteuid(uid_t euid)
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{
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return(setreuid(-1,euid));
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}
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#endif /* !defined(HAVE_SETEUID) && defined(HAVE_SETREUID) */
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