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gnupg/cipher/rndriscos.c
David Shaw 90279250e8 * blowfish.c (burn_stack), cast5.c (burn_stack), des.c (burn_stack), md5.c
(burn_stack), random.c (burn_stack, read_pool, fast_random_poll),
rijndael.c (burn_stack), rmd160.c (burn_stack), rndegd.c
(rndegd_gather_random), rndlinux.c (rndlinux_gather_random), rndriscos.c
(rndriscos_gather_random), sha1.c (burn_stack), tiger.c (burn_stack),
twofish.c (burn_stack): Replace various calls to memset() with the more
secure wipememory().
2002-11-06 15:28:12 +00:00

96 lines
2.5 KiB
C

/* rndriscos.c - raw random number for RISC OS
* Copyright (C) 2001 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>
#ifdef USE_RNDRISCOS
#include <string.h>
#include <kernel.h>
#include <swis.h>
#include "util.h"
static int init_device(void);
#define CryptRandom_Byte 0x51980
static const char * const path[] = {
"GnuPG:CryptRandom",
"GnuPG:CryptRand",
"System:Modules.CryptRandom"
"System:Modules.CryptRand",
NULL
};
/****************
* Used to load the CryptRandom module if it isn't already loaded
*/
static int
init_device(void)
{
int i;
/* Is CryptRandom already loaded? */
if (!_swix(OS_Module, _INR(0,1), 18, "CryptRandom"))
return 1;
/* Check all the places where the module could be located */
for (i=0; path[i]; ++i)
if (!_swix(OS_Module, _INR(0,1), 1, path[i]))
return 1;
/* Can't find CryptRandom in the default locations */
g10_log_fatal("Can't load module CryptRandom.\n");
return 0; /* never reached, but don't throw a warning */
}
/****************
* Get the random bytes from module
*/
int
rndriscos_gather_random(void (*add)(const void*, size_t, int), int requester,
size_t length, int level)
{
static int initialized = 0;
int n;
byte buffer[768];
if (!initialized)
initialized = init_device();
while (length) {
int nbytes = length < sizeof(buffer) ? length : sizeof(buffer);
for (n = 0; n < nbytes; ++n)
if (_swix(CryptRandom_Byte, _OUT(0), &buffer[n]))
g10_log_fatal("CryptRandom module isn't working as expected!\n");
(*add)(buffer, n, requester);
length -= n;
}
wipememory(buffer, sizeof(buffer));
return 0; /* success */
}
#endif /*USE_RNDRISCOS */