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148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/* rndriscos.c - raw random number for RISC OS
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* Copyright (C) 2001 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 <errno.h>
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#include <string.h>
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#include <kernel.h>
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#include <swis.h>
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#include "util.h"
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#include "dynload.h"
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static int init_device(void);
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static int gather_random(void (*add)(const void*, size_t, int), int requester,
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size_t length, int level);
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#define CryptRandom_Byte 0x51980
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/****************
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* Used to load the CryptRandom module if it isn't already loaded
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*/
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static int
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init_device(void)
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{
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_kernel_swi_regs r;
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/* Is CryptRandom already loaded? */
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r.r[0] = 18;
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r.r[1] = (int) "CryptRandom";
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if (!_kernel_swi(OS_Module, &r, &r))
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return 1;
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/* Is it named CryptRand and inside GnuPG$Path? */
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r.r[0] = 1;
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r.r[1] = (int) "GnuPG:CryptRand";
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if (!_kernel_swi(OS_Module, &r, &r))
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return 1;
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/* Is it named CryptRandom and inside GnuPG$Path? */
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r.r[0] = 1;
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r.r[1] = (int) "GnuPG:CryptRandom";
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if (!_kernel_swi(OS_Module, &r, &r))
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return 1;
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/* Can't find CryptRandom in the default locations */
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g10_log_fatal("Can't load module CryptRandom.\n");
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}
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/****************
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*/
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static int
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gather_random(void (*add)(const void*, size_t, int), int requester,
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size_t length, int level)
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{
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static int initialized = 0;
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int n;
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byte buffer[768];
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_kernel_swi_regs r;
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_kernel_oserror *e;
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if (!initialized)
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initialized = init_device();
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while (length) {
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int nbytes = length < sizeof(buffer) ? length : sizeof(buffer);
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for (n = 0; n < nbytes; n++) {
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if (e = _kernel_swi(CryptRandom_Byte, &r, &r))
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g10_log_fatal("CryptRandom module isn't working as expected!\n");
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buffer[n] = (byte) r.r[0];
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}
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(*add)(buffer, n, requester);
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length -= n;
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}
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memset(buffer, 0, sizeof(buffer));
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return 0; /* success */
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}
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#ifndef IS_MODULE
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static
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#endif
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const char * const gnupgext_version = "RNDRISCOS ($Revision$)";
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static struct {
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int class;
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int version;
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int (*func)(void);
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} func_table[] = {
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{ 40, 1, (int (*)(void))gather_random },
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};
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#ifndef IS_MODULE
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static
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#endif
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void *
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gnupgext_enum_func( int what, int *sequence, int *class, int *vers )
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{
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void *ret;
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int i = *sequence;
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do {
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if ( i >= DIM(func_table) || i < 0 ) {
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return NULL;
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}
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*class = func_table[i].class;
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*vers = func_table[i].version;
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ret = (void*) func_table[i].func;
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i++;
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} while ( what && what != *class );
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*sequence = i;
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return ret;
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}
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#ifndef IS_MODULE
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void
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rndriscos_constructor(void)
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{
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register_internal_cipher_extension( gnupgext_version,
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gnupgext_enum_func );
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}
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#endif
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