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/* 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>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <kernel.h>
#include <swis.h>
#include "util.h"
#include "dynload.h"
static int init_device(void);
static int gather_random(void (*add)(const void*, size_t, int), int requester,
size_t length, int level);
#define CryptRandom_Byte 0x51980
/****************
* Used to load the CryptRandom module if it isn't already loaded
*/
static int
init_device(void)
{
_kernel_swi_regs r;
/* Is CryptRandom already loaded? */
r.r[0] = 18;
r.r[1] = (int) "CryptRandom";
if (!_kernel_swi(OS_Module, &r, &r))
return 1;
/* Is it named CryptRand and inside GnuPG$Path? */
r.r[0] = 1;
r.r[1] = (int) "GnuPG:CryptRand";
if (!_kernel_swi(OS_Module, &r, &r))
return 1;
/* Is it named CryptRandom and inside GnuPG$Path? */
r.r[0] = 1;
r.r[1] = (int) "GnuPG:CryptRandom";
if (!_kernel_swi(OS_Module, &r, &r))
return 1;
/* Can't find CryptRandom in the default locations */
g10_log_fatal("Can't load module CryptRandom.\n");
}
/****************
*/
static int
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];
_kernel_swi_regs r;
_kernel_oserror *e;
if (!initialized)
initialized = init_device();
while (length) {
int nbytes = length < sizeof(buffer) ? length : sizeof(buffer);
for (n = 0; n < nbytes; n++) {
if (e = _kernel_swi(CryptRandom_Byte, &r, &r))
g10_log_fatal("CryptRandom module isn't working as expected!\n");
buffer[n] = (byte) r.r[0];
}
(*add)(buffer, n, requester);
length -= n;
}
memset(buffer, 0, sizeof(buffer));
return 0; /* success */
}
#ifndef IS_MODULE
static
#endif
const char * const gnupgext_version = "RNDRISCOS ($Revision$)";
static struct {
int class;
int version;
int (*func)(void);
} func_table[] = {
{ 40, 1, (int (*)(void))gather_random },
};
#ifndef IS_MODULE
static
#endif
void *
gnupgext_enum_func( int what, int *sequence, int *class, int *vers )
{
void *ret;
int i = *sequence;
do {
if ( i >= DIM(func_table) || i < 0 ) {
return NULL;
}
*class = func_table[i].class;
*vers = func_table[i].version;
ret = (void*) func_table[i].func;
i++;
} while ( what && what != *class );
*sequence = i;
return ret;
}
#ifndef IS_MODULE
void
rndriscos_constructor(void)
{
register_internal_cipher_extension( gnupgext_version,
gnupgext_enum_func );
}
#endif
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