mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/* rand-dummy.c - INSECURE dummy random device
|
|
* Copyright (C) 1998 Free Software Foundation, Inc.
|
|
*
|
|
* This file is part of GNUPG.
|
|
*
|
|
* GNUPG is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GNUPG is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
|
|
#include <config.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#ifdef HAVE_GETHRTIME
|
|
#include <sys/times.h>
|
|
#endif
|
|
#ifndef HAVE_GETTIMEOFTIME
|
|
#include <sys/times.h>
|
|
#endif
|
|
#ifdef HAVE_GETRUSAGE
|
|
#include <sys/resource.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include "util.h"
|
|
#include "ttyio.h"
|
|
#include "i18n.h"
|
|
#include "rand-internal.h"
|
|
#ifdef USE_RAND_DUMMY /* a dummy random file so we can do some tests */
|
|
|
|
|
|
#ifndef RAND_MAX /* for SunOS */
|
|
#define RAND_MAX 32767
|
|
#endif
|
|
|
|
#if __GNUC__
|
|
#warning Using the insecure dummy random device
|
|
#endif
|
|
|
|
void
|
|
random_poll()
|
|
{
|
|
char buf[POOLSIZE/5];
|
|
read_random_source( buf, POOLSIZE/5, 1 ); /* read dummy data */
|
|
add_randomness( buf, POOLSIZE/5, 2);
|
|
memset( buf, 0, POOLSIZE/5);
|
|
}
|
|
|
|
|
|
void
|
|
fast_random_poll()
|
|
{
|
|
#if HAVE_GETHRTIME
|
|
{ hrtime_t tv;
|
|
tv = gethrtime();
|
|
add_randomness( &tv, sizeof(tv), 1 );
|
|
}
|
|
#elif HAVE_GETTIMEOFTIME
|
|
{ struct timeval tv;
|
|
if( gettimeofday( &tv, NULL ) )
|
|
BUG();
|
|
add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
|
|
add_randomness( &tv.tv_usec, sizeof(tv.tv_usec), 1 );
|
|
}
|
|
#else /* use times */
|
|
{ struct tms buf;
|
|
times( &buf );
|
|
add_randomness( &buf, sizeof buf, 1 );
|
|
}
|
|
#endif
|
|
#ifdef HAVE_GETRUSAGE
|
|
{ struct rusage buf;
|
|
if( getrusage( RUSAGE_SELF, &buf ) )
|
|
BUG();
|
|
add_randomness( &buf, sizeof buf, 1 );
|
|
memset( &buf, 0, sizeof buf );
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
|
|
void
|
|
read_random_source( byte *buffer, size_t length, int level )
|
|
{
|
|
static int initialized=0;
|
|
|
|
if( !initialized ) {
|
|
log_info(_("warning: using insecure random number generator!!\n"));
|
|
tty_printf(_("The random number generator is only a kludge to let\n"
|
|
"it compile - it is in no way a strong RNG!\n\n"
|
|
"DON'T USE ANY DATA GENERATED BY THIS PROGRAM!!\n\n"));
|
|
initialized=1;
|
|
#ifdef HAVE_RAND
|
|
srand(make_timestamp()*getpid());
|
|
#else
|
|
srandom(make_timestamp()*getpid());
|
|
#endif
|
|
}
|
|
|
|
#ifdef HAVE_RAND
|
|
while( length-- )
|
|
*buffer++ = ((unsigned)(1 + (int) (256.0*rand()/(RAND_MAX+1.0)))-1);
|
|
#else
|
|
while( length-- )
|
|
*buffer++ = ((unsigned)(1 + (int) (256.0*random()/(RAND_MAX+1.0)))-1);
|
|
#endif
|
|
}
|
|
|
|
|
|
#endif /* USE_RAND_DUMMY */
|