source: roaraudio/libroar/random.c @ 5396:e2e5f307ef8b

Last change on this file since 5396:e2e5f307ef8b was 5381:430b1d26e12d, checked in by phi, 12 years ago

updated copyright years

File size: 5.3 KB
Line 
1//random.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2012
5 *
6 *  This file is part of libroar a part of RoarAudio,
7 *  a cross-platform sound system for both, home and professional use.
8 *  See README for details.
9 *
10 *  This file is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 3
12 *  as published by the Free Software Foundation.
13 *
14 *  libroar is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this software; see the file COPYING.  If not, write to
21 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 *  NOTE for everyone want's to change something and send patches:
25 *  read README and HACKING! There a addition information on
26 *  the license of this document you need to read before you send
27 *  any patches.
28 *
29 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
30 *  or libpulse*:
31 *  The libs libroaresd, libroararts and libroarpulse link this lib
32 *  and are therefore GPL. Because of this it may be illigal to use
33 *  them with any software that uses libesd, libartsc or libpulse*.
34 */
35
36#include "libroar.h"
37
38#ifdef ROAR_HAVE_LIBGCRYPT
39#include <gcrypt.h>
40#endif
41
42static void roar_random_init (void) {
43 static int inited = 0;
44
45 if (inited)
46  return;
47
48 // add stuff here needed to bring up random source.
49 roar_crypto_init();
50
51 inited = 1;
52}
53
54#define TIGER_BLOCKLEN  55
55#define TIGER_DIGESTLEN (3*8)
56
57static size_t roar_nonce_salt_len = 0;
58static void * roar_nonce_salt     = NULL;
59
60static unsigned char roar_nonce_pool[TIGER_DIGESTLEN];
61static size_t        roar_nonce_pool_len = 0;
62
63int roar_random_gen_nonce(void * buffer, size_t len) {
64 static uint32_t buf[14];
65 static int inited = 0;
66 static int idx = 0;
67 volatile pid_t pid = getpid();
68 size_t i, writelen;
69 void * off = buf;
70#ifdef ROAR_HAVE_TIME
71 volatile uint32_t now = time(NULL);
72#endif
73
74 roar_random_init();
75
76 if ( !inited ) {
77  for (i = 0; i < (sizeof(buf)/sizeof(*buf)); i++) {
78#ifdef ROAR_HAVE_RAND
79   buf[i] = rand() + pid;
80#else
81   buf[i] = pid;
82#endif
83  }
84
85#ifdef ROAR_HAVE_TIME
86  buf[11] += now;
87#endif
88
89  roar_hash_buffer(off,                 buf, TIGER_BLOCKLEN, ROAR_HT_TIGER);
90  roar_hash_buffer(off+TIGER_DIGESTLEN, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER);
91
92  inited = 1;
93 }
94
95 while (len) {
96
97#ifdef ROAR_HAVE_TIME
98  buf[12] += now;
99#endif
100
101#ifdef ROAR_HAVE_RAND
102  buf[12] += rand();
103#endif
104
105  buf[12] += pid;
106  buf[13] += pid;
107
108  off = buf;
109  if ( idx ) {
110   off += TIGER_DIGESTLEN;
111   idx  = 0;
112  } else {
113   idx  = 1;
114  }
115
116  roar_hash_salted_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER, roar_nonce_salt, roar_nonce_salt_len);
117
118  writelen = len >= TIGER_DIGESTLEN ? TIGER_DIGESTLEN : len;
119  memcpy(buffer, off, writelen);
120
121  buffer += writelen;
122  len    -= writelen;
123 }
124
125 return 0;
126}
127
128int roar_random_salt_nonce (void * salt, size_t len) {
129 char buf[1];
130 int ret;
131
132 roar_nonce_salt     = salt;
133 roar_nonce_salt_len = len;
134
135 ret = roar_random_gen_nonce(buf, sizeof(buf));
136
137 roar_nonce_salt     = NULL;
138 roar_nonce_salt_len = 0;
139
140 return ret;
141}
142
143uint16_t roar_random_uint16(void) {
144 uint16_t ret;
145
146 if ( roar_nonce_pool_len < 2 ) {
147  roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool));
148  roar_nonce_pool_len = sizeof(roar_nonce_pool);
149 }
150
151 ret  = roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] <<  0;
152 ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] <<  8;
153
154 roar_nonce_pool_len -= 2;
155
156 return ret;
157}
158
159uint32_t roar_random_uint32(void) {
160 uint32_t ret;
161
162 if ( roar_nonce_pool_len < 4 ) {
163  roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool));
164  roar_nonce_pool_len = sizeof(roar_nonce_pool);
165 }
166
167 ret  = (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] <<  0;
168 ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] <<  8;
169 ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+2] << 16;
170 ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+3] << 24;
171
172 roar_nonce_pool_len -= 4;
173
174 return ret;
175}
176
177int roar_random_gen(void * buffer, size_t len, int quality) {
178 if ( len == 0 )
179  return 0;
180
181 if ( buffer == NULL )
182  return -1;
183
184 roar_random_init();
185
186 switch (quality) {
187  case ROAR_RANDOM_NONE:
188    // no entropy:
189    memset(buffer, 0, len);
190   break;
191  case ROAR_RANDOM_VERY_WEAK:
192    return roar_random_gen_nonce(buffer, len);
193   break;
194#ifdef ROAR_HAVE_LIBGCRYPT
195  case ROAR_RANDOM_WEAK:
196    gcry_create_nonce(buffer, len);
197   break;
198  case ROAR_RANDOM_NORMAL:
199  case ROAR_RANDOM_STRONG:
200    gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
201   break;
202  case ROAR_RANDOM_VERY_STRONG:
203    gcry_randomize(buffer, len, GCRY_VERY_STRONG_RANDOM);
204   break;
205#endif
206  default:
207    return -1;
208   break;
209 }
210
211 return 0;
212}
213
214void * roar_random_genbuf(size_t len, int quality, int locked) {
215 void * ret = roar_mm_malloc(len);
216
217 if (ret == NULL)
218  return NULL;
219
220 if ( locked ) {
221  if ( roar_mm_mlock(ret, len) == -1 ) {
222   roar_mm_free(ret);
223   return NULL;
224  }
225 }
226
227 if ( roar_random_gen(ret, len, quality) == -1 ) {
228  roar_mm_free(ret);
229  return NULL;
230 }
231
232 return ret;
233}
234
235//ll
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