mirror of git://git.gnupg.org/gnupg.git
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/* rand-dummy.c - INSECURE dummy random device
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* Copyright (C) 1998 Free Software Foundation, Inc.
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*
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* This file is part of GNUPG.
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*
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* GNUPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GNUPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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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 <assert.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_GETHRTIME
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#include <sys/times.h>
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#endif
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#ifdef HAVE_GETTIMEOFDAY
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#include <sys/times.h>
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#endif
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#ifdef HAVE_GETRUSAGE
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#include <sys/resource.h>
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#endif
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#include <string.h>
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#include <unistd.h>
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#ifdef __MINGW32__
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#include <process.h>
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#endif
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#include <fcntl.h>
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#include "util.h"
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#include "ttyio.h"
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#include "i18n.h"
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#include "rand-internal.h"
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#ifdef USE_RAND_DUMMY /* a dummy random file so we can do some tests */
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#ifndef RAND_MAX /* for SunOS */
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#define RAND_MAX 32767
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#endif
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#if __GNUC__
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#warning Using the insecure dummy random device
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#endif
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void
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random_poll()
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{
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char buf[POOLSIZE/5];
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read_random_source( buf, POOLSIZE/5, 1 ); /* read dummy data */
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add_randomness( buf, POOLSIZE/5, 2);
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memset( buf, 0, POOLSIZE/5);
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}
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void
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fast_random_poll()
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{
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#if HAVE_GETHRTIME
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{ hrtime_t tv;
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tv = gethrtime();
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add_randomness( &tv, sizeof(tv), 1 );
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}
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#elif HAVE_GETTIMEOFDAY
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{ struct timeval tv;
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if( gettimeofday( &tv, NULL ) )
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BUG();
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add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
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add_randomness( &tv.tv_usec, sizeof(tv.tv_usec), 1 );
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}
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#else /* use times */
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{
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#ifndef __MINGW32__
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struct tms buf;
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times( &buf );
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add_randomness( &buf, sizeof buf, 1 );
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#endif
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}
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#endif
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#ifdef HAVE_GETRUSAGE
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{ struct rusage buf;
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if( getrusage( RUSAGE_SELF, &buf ) )
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BUG();
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add_randomness( &buf, sizeof buf, 1 );
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memset( &buf, 0, sizeof buf );
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}
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#endif
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}
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void
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read_random_source( byte *buffer, size_t length, int level )
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{
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static int initialized=0;
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if( !initialized ) {
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log_info(_("WARNING: using insecure random number generator!!\n"));
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tty_printf(_("The random number generator is only a kludge to let\n"
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"it compile - it is in no way a strong RNG!\n\n"
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"DON'T USE ANY DATA GENERATED BY THIS PROGRAM!!\n\n"));
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initialized=1;
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#ifdef HAVE_RAND
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srand(make_timestamp()*getpid());
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#else
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srandom(make_timestamp()*getpid());
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#endif
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}
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#ifdef HAVE_RAND
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while( length-- )
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*buffer++ = ((unsigned)(1 + (int) (256.0*rand()/(RAND_MAX+1.0)))-1);
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#else
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while( length-- )
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*buffer++ = ((unsigned)(1 + (int) (256.0*random()/(RAND_MAX+1.0)))-1);
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#endif
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}
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#endif /* USE_RAND_DUMMY */
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