mirror of
git://git.gnupg.org/gnupg.git
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260 lines
7.1 KiB
C
260 lines
7.1 KiB
C
/* rndw32.c - interface to the Winseed DLL
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* Copyright (C) 1999 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 <string.h>
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#include <windows.h>
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#include "types.h"
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#include "util.h"
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#include "dynload.h"
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#ifdef IS_MODULE
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#define _(a) (a)
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#else
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#include "i18n.h"
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#endif
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#define WIN32_SLOW_SEEDER 0
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#define WIN32_FAST_SEEDER 1
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#define PCP_SUCCESS 0
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#define PCP_NULL_POINTER 1
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#define PCP_SEEDER_FAILED 2
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#define PCP_SEEDER_NO_MEM 3
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#define PCP_SEEDER_TOO_SMALL 4
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#define PCP_DLL_LOAD_FAILED 5
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#define PCP_UNKNOWN_PLATFORM 6
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#define PCP_ERROR_VERSION 7
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#define PCP_DLL_FUNC 8
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#define PCP_UNKNOWN_SEEDER_TYPE 9
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typedef void *WIN32_SEEDER;
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static WIN32_SEEDER (WINAPI *create_instance)( byte type, unsigned int *reason);
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static void (WINAPI *delete_instance)( WIN32_SEEDER that );
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static unsigned int (WINAPI *get_internal_seed_size)( WIN32_SEEDER that );
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static void (WINAPI *set_internal_seed_size)( WIN32_SEEDER that,
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unsigned int new_size);
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static unsigned int (WINAPI *get_expected_seed_size)( WIN32_SEEDER that);
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static unsigned int (WINAPI *get_seed)( WIN32_SEEDER that, byte *buffer,
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unsigned int *desired_length);
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static WIN32_SEEDER slow_seeder, fast_seeder;
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static byte *entropy_buffer;
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static size_t entropy_buffer_size;
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/****************
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* Load and initialize the winseed DLL
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* NOTE: winseed is not part of the GnuPG distribution. It should be available
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* at the GNU crypto FTP server site.
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* We do not load the DLL on demand to have a better control over the
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* location of the library.
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*/
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static void
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load_and_init_winseed( void )
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{
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int hInstance;
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void *addr;
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unsigned int reason = 0;
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unsigned int n1, n2;
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const char *dllname;
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dllname = read_w32_registry_string( "HKEY_LOCAL_MACHINE",
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"Software\\GNU\\GnuPG",
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"EntropyDLL" );
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if( !dllname )
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dllname = "c:/gnupg/entropy.dll";
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hInstance = LoadLibrary( dllname );
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if( !hInstance )
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goto failure;
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if( !(addr = GetProcAddress( hInstance, "WS_create_instance" )) )
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goto failure;
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create_instance = addr;
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if( !(addr = GetProcAddress( hInstance, "WS_delete_instance" )) )
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goto failure;
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delete_instance = addr;
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if( !(addr = GetProcAddress( hInstance, "WS_get_internal_seed_size" )) )
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goto failure;
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get_internal_seed_size = addr;
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if( !(addr = GetProcAddress( hInstance, "WS_set_internal_seed_size" )) )
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goto failure;
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set_internal_seed_size = addr;
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if( !(addr = GetProcAddress( hInstance, "WS_get_expected_seed_size" )) )
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goto failure;
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get_expected_seed_size = addr;
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if( !(addr = GetProcAddress( hInstance, "WS_get_seed" )) )
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goto failure;
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get_seed = addr;
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/* we have all the functions - init the system */
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slow_seeder = create_instance( WIN32_SLOW_SEEDER, &reason);
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if( !slow_seeder ) {
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g10_log_fatal("error creating winseed slow seeder: rc=%u\n", reason );
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goto failure;
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}
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fast_seeder = create_instance( WIN32_FAST_SEEDER, &reason);
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if( !fast_seeder ) {
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g10_log_fatal("error creating winseed fast seeder: rc=%u\n", reason );
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goto failure;
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}
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n1 = get_internal_seed_size( slow_seeder );
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/*g10_log_info("slow buffer size=%u\n", n1);*/
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n2 = get_internal_seed_size( fast_seeder );
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/*g10_log_info("fast buffer size=%u\n", n2);*/
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entropy_buffer_size = n1 > n2? n1: n2;
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entropy_buffer = m_alloc( entropy_buffer_size );
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/*g10_log_info("using a buffer of size=%u\n", entropy_buffer_size );*/
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return;
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failure:
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g10_log_fatal("error loading winseed DLL `%s'\n", dllname );
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}
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/* Note: we always use the highest level.
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* TO boost the performance we may want to add some
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* additional code for level 1
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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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unsigned int result;
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unsigned int nbytes;
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if( !slow_seeder )
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load_and_init_winseed();
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/* Our estimation on how much entropy we should use is very vague.
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* Winseed delivers some amount of entropy on each slow poll and
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* we add it to our random pool. Depending on the required quality
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* level we adjust the requested length so that for higer quality
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* we make sure to add more entropy to our pool. However, as we don't
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* like to waste any entropy collected by winseed, we always add
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* at least everything we got from winseed.
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*/
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if( level > 1 )
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length *= 100;
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else if( level > 0 )
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length *= 10;
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for(;;) {
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nbytes = entropy_buffer_size;
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result = get_seed( slow_seeder, entropy_buffer, &nbytes);
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if( result ) {
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g10_log_fatal("rndw32: get_seed(slow) failed: rc=%u\n", result);
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return -1; /* actually never reached */
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}
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/*g10_log_info("rndw32: slow poll level %d, need %u, got %u\n",
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level, (unsigned int)length, (unsigned int)nbytes );*/
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(*add)( entropy_buffer, nbytes, requester );
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if( length <= nbytes )
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return 0; /* okay */
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length -= nbytes;
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}
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}
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static int
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gather_random_fast( void (*add)(const void*, size_t, int), int requester )
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{
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unsigned int result;
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unsigned int nbytes;
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if( !fast_seeder )
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load_and_init_winseed();
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/* winseed delivers a constant ammount of entropy for a fast
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* poll. We can simply use this and add it to the pool; no need
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* a loop like it is used in the slow poll */
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nbytes = entropy_buffer_size;
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result = get_seed( fast_seeder, entropy_buffer, &nbytes);
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if( result ) {
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g10_log_fatal("rndw32: get_seed(fast) failed: rc=%u\n", result);
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return -1; /* actually never reached */
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}
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/*g10_log_info("rndw32: fast poll got %u\n", (unsigned int)nbytes );*/
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(*add)( entropy_buffer, nbytes, requester );
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return 0;
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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 = "RNDW32 ($Revision$)";
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static struct {
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int class;
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int version;
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void *func;
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} func_table[] = {
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{ 40, 1, gather_random },
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{ 41, 1, gather_random_fast },
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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 = 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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rndw32_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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