[4446] | 1 | //random.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010 |
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| 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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[4447] | 38 | #ifdef ROAR_HAVE_LIBGCRYPT |
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| 39 | #include <gcrypt.h> |
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| 40 | #endif |
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| 41 | |
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| 42 | static void roar_random_init (void) { |
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| 43 | static int inited = 0; |
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| 44 | |
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| 45 | if (inited) |
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| 46 | return; |
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| 47 | |
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| 48 | // add stuff here needed to bring up random source. |
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[4454] | 49 | roar_crypto_init(); |
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[4447] | 50 | |
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| 51 | inited = 1; |
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| 52 | } |
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| 53 | |
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[4672] | 54 | #define TIGER_BLOCKLEN 55 |
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| 55 | #define TIGER_DIGESTLEN (3*8) |
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| 56 | |
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| 57 | int roar_random_gen_nonce(void * buffer, size_t len) { |
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| 58 | static uint32_t buf[14]; |
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| 59 | static int inited = 0; |
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| 60 | static int idx = 0; |
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| 61 | volatile pid_t pid = getpid(); |
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| 62 | size_t i, writelen; |
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| 63 | void * off = buf; |
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| 64 | |
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| 65 | roar_random_init(); |
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| 66 | |
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| 67 | if ( !inited ) { |
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| 68 | for (i = 0; i < (sizeof(buf)/sizeof(*buf)); i++) { |
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| 69 | #ifdef ROAR_HAVE_RAND |
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| 70 | buf[i] = rand() + pid; |
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| 71 | #else |
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| 72 | buf[i] = pid; |
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| 73 | #endif |
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| 74 | } |
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| 75 | |
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| 76 | roar_hash_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER); |
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| 77 | roar_hash_buffer(off+TIGER_DIGESTLEN, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER); |
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| 78 | |
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| 79 | inited = 1; |
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| 80 | } |
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| 81 | |
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| 82 | while (len) { |
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| 83 | |
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| 84 | #ifdef ROAR_HAVE_TIME |
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| 85 | buf[12] += time(NULL); |
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| 86 | #endif |
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| 87 | |
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| 88 | #ifdef ROAR_HAVE_RAND |
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| 89 | buf[12] += rand(); |
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| 90 | #endif |
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| 91 | |
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| 92 | buf[12] += pid; |
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| 93 | buf[13] += pid; |
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| 94 | |
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| 95 | off = buf; |
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| 96 | if ( idx ) { |
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| 97 | off += TIGER_DIGESTLEN; |
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| 98 | idx = 0; |
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| 99 | } else { |
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| 100 | idx = 1; |
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| 101 | } |
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| 102 | |
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| 103 | roar_hash_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER); |
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| 104 | |
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| 105 | writelen = len >= TIGER_DIGESTLEN ? TIGER_DIGESTLEN : len; |
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| 106 | memcpy(buffer, off, writelen); |
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| 107 | |
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| 108 | buffer += writelen; |
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| 109 | len -= writelen; |
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| 110 | } |
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| 111 | |
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| 112 | return 0; |
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| 113 | } |
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| 114 | |
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[4447] | 115 | int roar_random_gen(void * buffer, size_t len, int quality) { |
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| 116 | if ( len == 0 ) |
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| 117 | return 0; |
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| 118 | |
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| 119 | if ( buffer == NULL ) |
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| 120 | return -1; |
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| 121 | |
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| 122 | roar_random_init(); |
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| 123 | |
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| 124 | switch (quality) { |
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| 125 | case ROAR_RANDOM_NONE: |
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| 126 | // no entropy: |
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| 127 | memset(buffer, 0, len); |
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| 128 | break; |
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[4673] | 129 | case ROAR_RANDOM_VERY_WEAK: |
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| 130 | return roar_random_gen_nonce(buffer, len); |
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| 131 | break; |
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[4447] | 132 | #ifdef ROAR_HAVE_LIBGCRYPT |
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| 133 | case ROAR_RANDOM_WEAK: |
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| 134 | gcry_create_nonce(buffer, len); |
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| 135 | break; |
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| 136 | case ROAR_RANDOM_NORMAL: |
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| 137 | case ROAR_RANDOM_STRONG: |
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| 138 | gcry_randomize(buffer, len, GCRY_STRONG_RANDOM); |
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| 139 | break; |
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| 140 | case ROAR_RANDOM_VERY_STRONG: |
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| 141 | gcry_randomize(buffer, len, GCRY_VERY_STRONG_RANDOM); |
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| 142 | break; |
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| 143 | #endif |
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| 144 | default: |
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| 145 | return -1; |
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| 146 | break; |
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| 147 | } |
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| 148 | |
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| 149 | return 0; |
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| 150 | } |
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| 151 | |
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| 152 | void * roar_random_genbuf(size_t len, int quality, int locked) { |
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| 153 | void * ret = roar_mm_malloc(len); |
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| 154 | |
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| 155 | if (ret == NULL) |
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| 156 | return NULL; |
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| 157 | |
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| 158 | if ( locked ) { |
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| 159 | if ( roar_mm_mlock(ret, len) == -1 ) { |
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| 160 | roar_mm_free(ret); |
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| 161 | return NULL; |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | if ( roar_random_gen(ret, len, quality) == -1 ) { |
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| 166 | roar_mm_free(ret); |
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| 167 | return NULL; |
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| 168 | } |
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| 169 | |
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| 170 | return ret; |
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| 171 | } |
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| 172 | |
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[4446] | 173 | //ll |
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