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/* random.c - part of the Libgcrypt test suite.
Copyright (C) 2005 Free Software Foundation, Inc.
This program 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.
This program 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. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <sys/wait.h>
#include "../src/gcrypt.h"
static int verbose;
static void
die (const char *format, ...)
{
va_list arg_ptr;
va_start (arg_ptr, format);
vfprintf (stderr, format, arg_ptr);
va_end (arg_ptr);
exit (1);
}
static void
print_hex (const char *text, const void *buf, size_t n)
{
const unsigned char *p = buf;
fputs (text, stdout);
for (; n; n--, p++)
printf ("%02X", *p);
putchar ('\n');
}
static int
writen (int fd, const void *buf, size_t nbytes)
{
size_t nleft = nbytes;
int nwritten;
while (nleft > 0)
{
nwritten = write (fd, buf, nleft);
if (nwritten < 0)
{
if (errno == EINTR)
nwritten = 0;
else
return -1;
}
nleft -= nwritten;
buf = (const char*)buf + nwritten;
}
return 0;
}
static int
readn (int fd, void *buf, size_t buflen, size_t *ret_nread)
{
size_t nleft = buflen;
int nread;
char *p;
p = buf;
while ( nleft > 0 )
{
nread = read ( fd, buf, nleft );
if (nread < 0)
{
if (nread == EINTR)
nread = 0;
else
return -1;
}
else if (!nread)
break; /* EOF */
nleft -= nread;
buf = (char*)buf + nread;
}
if (ret_nread)
*ret_nread = buflen - nleft;
return 0;
}
/* Check that forking won't return the same random. */
static void
check_forking (void)
{
pid_t pid;
int rp[2];
int i, status;
size_t nread;
char tmp1[16], tmp1c[16], tmp1p[16];
/* We better make sure that the RNG has been initialzied. */
gcry_randomize (tmp1, sizeof tmp1, GCRY_STRONG_RANDOM);
if (verbose)
print_hex ("initial random: ", tmp1, sizeof tmp1);
if (pipe (rp) == -1)
die ("pipe failed: %s\n", strerror (errno));
pid = fork ();
if (pid == (pid_t)(-1))
die ("fork failed: %s\n", strerror (errno));
if (!pid)
{
gcry_randomize (tmp1c, sizeof tmp1c, GCRY_STRONG_RANDOM);
if (writen (rp[1], tmp1c, sizeof tmp1c))
die ("write failed: %s\n", strerror (errno));
if (verbose)
{
print_hex (" child random: ", tmp1c, sizeof tmp1c);
fflush (stdout);
}
_exit (0);
}
gcry_randomize (tmp1p, sizeof tmp1p, GCRY_STRONG_RANDOM);
if (verbose)
print_hex (" parent random: ", tmp1p, sizeof tmp1p);
close (rp[1]);
if (readn (rp[0], tmp1c, sizeof tmp1c, &nread))
die ("read failed: %s\n", strerror (errno));
if (nread != sizeof tmp1c)
die ("read too short\n");
while ( (i=waitpid (pid, &status, 0)) == -1 && errno == EINTR)
;
if (i != (pid_t)(-1)
&& WIFEXITED (status) && !WEXITSTATUS (status))
;
else
die ("child failed\n");
if (!memcmp (tmp1p, tmp1c, sizeof tmp1c))
die ("parent and child got the same random number\n");
}
/* Check that forking won't return the same nonce. */
static void
check_nonce_forking (void)
{
pid_t pid;
int rp[2];
int i, status;
size_t nread;
char nonce1[10], nonce1c[10], nonce1p[10];
/* We won't get the same nonce back if we never initialized the
nonce subsystem, thus we get one nonce here and forget about
it. */
gcry_create_nonce (nonce1, sizeof nonce1);
if (verbose)
print_hex ("initial nonce: ", nonce1, sizeof nonce1);
if (pipe (rp) == -1)
die ("pipe failed: %s\n", strerror (errno));
pid = fork ();
if (pid == (pid_t)(-1))
die ("fork failed: %s\n", strerror (errno));
if (!pid)
{
gcry_create_nonce (nonce1c, sizeof nonce1c);
if (writen (rp[1], nonce1c, sizeof nonce1c))
die ("write failed: %s\n", strerror (errno));
if (verbose)
{
print_hex (" child nonce: ", nonce1c, sizeof nonce1c);
fflush (stdout);
}
_exit (0);
}
gcry_create_nonce (nonce1p, sizeof nonce1p);
if (verbose)
print_hex (" parent nonce: ", nonce1p, sizeof nonce1p);
close (rp[1]);
if (readn (rp[0], nonce1c, sizeof nonce1c, &nread))
die ("read failed: %s\n", strerror (errno));
if (nread != sizeof nonce1c)
die ("read too short\n");
while ( (i=waitpid (pid, &status, 0)) == -1 && errno == EINTR)
;
if (i != (pid_t)(-1)
&& WIFEXITED (status) && !WEXITSTATUS (status))
;
else
die ("child failed\n");
if (!memcmp (nonce1p, nonce1c, sizeof nonce1c))
die ("parent and child got the same nonce\n");
}
int
main (int argc, char **argv)
{
int debug = 0;
if ((argc > 1) && (! strcmp (argv[1], "--verbose")))
verbose = 1;
else if ((argc > 1) && (! strcmp (argv[1], "--debug")))
verbose = debug = 1;
signal (SIGPIPE, SIG_IGN);
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
if (!gcry_check_version (GCRYPT_VERSION))
die ("version mismatch\n");
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
if (debug)
gcry_control (GCRYCTL_SET_DEBUG_FLAGS, 1u, 0);
check_forking ();
check_nonce_forking ();
return 0;
}
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