[4446] | 1 | //random.c: |
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| 2 | |
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| 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2012 |
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[4446] | 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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[5506] | 54 | #define TIGER_BLOCKLEN 64 |
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[4672] | 55 | #define TIGER_DIGESTLEN (3*8) |
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| 56 | |
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[4674] | 57 | static size_t roar_nonce_salt_len = 0; |
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| 58 | static void * roar_nonce_salt = NULL; |
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| 59 | |
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[4785] | 60 | static unsigned char roar_nonce_pool[TIGER_DIGESTLEN]; |
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| 61 | static size_t roar_nonce_pool_len = 0; |
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| 62 | |
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[4672] | 63 | int roar_random_gen_nonce(void * buffer, size_t len) { |
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[5506] | 64 | static uint32_t buf[TIGER_BLOCKLEN/4]; |
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[4672] | 65 | static int inited = 0; |
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| 66 | static int idx = 0; |
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| 67 | volatile pid_t pid = getpid(); |
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| 68 | size_t i, writelen; |
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| 69 | void * off = buf; |
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[4677] | 70 | #ifdef ROAR_HAVE_TIME |
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| 71 | volatile uint32_t now = time(NULL); |
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| 72 | #endif |
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[4672] | 73 | |
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| 74 | roar_random_init(); |
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| 75 | |
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| 76 | if ( !inited ) { |
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| 77 | for (i = 0; i < (sizeof(buf)/sizeof(*buf)); i++) { |
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| 78 | #ifdef ROAR_HAVE_RAND |
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| 79 | buf[i] = rand() + pid; |
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| 80 | #else |
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| 81 | buf[i] = pid; |
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| 82 | #endif |
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| 83 | } |
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| 84 | |
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[4755] | 85 | #ifdef ROAR_HAVE_TIME |
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| 86 | buf[11] += now; |
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| 87 | #endif |
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| 88 | |
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[4672] | 89 | roar_hash_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER); |
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| 90 | roar_hash_buffer(off+TIGER_DIGESTLEN, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER); |
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| 91 | |
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| 92 | inited = 1; |
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| 93 | } |
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| 94 | |
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| 95 | while (len) { |
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| 96 | |
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| 97 | #ifdef ROAR_HAVE_TIME |
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[4677] | 98 | buf[12] += now; |
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[4672] | 99 | #endif |
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| 100 | |
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| 101 | #ifdef ROAR_HAVE_RAND |
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| 102 | buf[12] += rand(); |
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| 103 | #endif |
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| 104 | |
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| 105 | buf[12] += pid; |
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| 106 | buf[13] += pid; |
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| 107 | |
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| 108 | off = buf; |
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| 109 | if ( idx ) { |
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| 110 | off += TIGER_DIGESTLEN; |
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| 111 | idx = 0; |
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| 112 | } else { |
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| 113 | idx = 1; |
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| 114 | } |
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| 115 | |
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[5506] | 116 | ROAR_DBG("roar_random_gen_nonce(*): buf={0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x, 0x%.8x}", |
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| 117 | (unsigned int)buf[0], (unsigned int)buf[1], (unsigned int)buf[2], (unsigned int)buf[3], (unsigned int)buf[4], (unsigned int)buf[5], (unsigned int)buf[6], (unsigned int)buf[7], (unsigned int)buf[8], (unsigned int)buf[9], (unsigned int)buf[10], (unsigned int)buf[11], (unsigned int)buf[12], (unsigned int)buf[13], (unsigned int)buf[14], (unsigned int)buf[15]); |
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| 118 | |
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[4674] | 119 | roar_hash_salted_buffer(off, buf, TIGER_BLOCKLEN, ROAR_HT_TIGER, roar_nonce_salt, roar_nonce_salt_len); |
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[4672] | 120 | |
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| 121 | writelen = len >= TIGER_DIGESTLEN ? TIGER_DIGESTLEN : len; |
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| 122 | memcpy(buffer, off, writelen); |
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| 123 | |
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| 124 | buffer += writelen; |
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| 125 | len -= writelen; |
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| 126 | } |
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| 127 | |
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| 128 | return 0; |
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| 129 | } |
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| 130 | |
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[4674] | 131 | int roar_random_salt_nonce (void * salt, size_t len) { |
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| 132 | char buf[1]; |
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| 133 | int ret; |
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| 134 | |
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| 135 | roar_nonce_salt = salt; |
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| 136 | roar_nonce_salt_len = len; |
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| 137 | |
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| 138 | ret = roar_random_gen_nonce(buf, sizeof(buf)); |
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| 139 | |
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| 140 | roar_nonce_salt = NULL; |
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| 141 | roar_nonce_salt_len = 0; |
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| 142 | |
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| 143 | return ret; |
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| 144 | } |
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| 145 | |
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[4785] | 146 | uint16_t roar_random_uint16(void) { |
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| 147 | uint16_t ret; |
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| 148 | |
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| 149 | if ( roar_nonce_pool_len < 2 ) { |
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| 150 | roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool)); |
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| 151 | roar_nonce_pool_len = sizeof(roar_nonce_pool); |
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| 152 | } |
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| 153 | |
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| 154 | ret = roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] << 0; |
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| 155 | ret |= roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] << 8; |
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| 156 | |
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| 157 | roar_nonce_pool_len -= 2; |
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| 158 | |
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| 159 | return ret; |
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| 160 | } |
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| 161 | |
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| 162 | uint32_t roar_random_uint32(void) { |
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| 163 | uint32_t ret; |
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| 164 | |
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| 165 | if ( roar_nonce_pool_len < 4 ) { |
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| 166 | roar_random_gen_nonce(roar_nonce_pool, sizeof(roar_nonce_pool)); |
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| 167 | roar_nonce_pool_len = sizeof(roar_nonce_pool); |
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| 168 | } |
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| 169 | |
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[5007] | 170 | ret = (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+0] << 0; |
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| 171 | ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+1] << 8; |
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| 172 | ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+2] << 16; |
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| 173 | ret |= (uint32_t)roar_nonce_pool[sizeof(roar_nonce_pool)-roar_nonce_pool_len+3] << 24; |
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[4785] | 174 | |
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| 175 | roar_nonce_pool_len -= 4; |
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| 176 | |
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| 177 | return ret; |
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| 178 | } |
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| 179 | |
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[4447] | 180 | int roar_random_gen(void * buffer, size_t len, int quality) { |
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| 181 | if ( len == 0 ) |
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| 182 | return 0; |
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| 183 | |
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| 184 | if ( buffer == NULL ) |
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| 185 | return -1; |
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| 186 | |
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| 187 | roar_random_init(); |
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| 188 | |
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| 189 | switch (quality) { |
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| 190 | case ROAR_RANDOM_NONE: |
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| 191 | // no entropy: |
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| 192 | memset(buffer, 0, len); |
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| 193 | break; |
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[4673] | 194 | case ROAR_RANDOM_VERY_WEAK: |
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| 195 | return roar_random_gen_nonce(buffer, len); |
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| 196 | break; |
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[4447] | 197 | #ifdef ROAR_HAVE_LIBGCRYPT |
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| 198 | case ROAR_RANDOM_WEAK: |
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| 199 | gcry_create_nonce(buffer, len); |
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| 200 | break; |
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| 201 | case ROAR_RANDOM_NORMAL: |
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| 202 | case ROAR_RANDOM_STRONG: |
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| 203 | gcry_randomize(buffer, len, GCRY_STRONG_RANDOM); |
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| 204 | break; |
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| 205 | case ROAR_RANDOM_VERY_STRONG: |
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| 206 | gcry_randomize(buffer, len, GCRY_VERY_STRONG_RANDOM); |
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| 207 | break; |
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| 208 | #endif |
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| 209 | default: |
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| 210 | return -1; |
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| 211 | break; |
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| 212 | } |
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| 213 | |
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| 214 | return 0; |
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| 215 | } |
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| 216 | |
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| 217 | void * roar_random_genbuf(size_t len, int quality, int locked) { |
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| 218 | void * ret = roar_mm_malloc(len); |
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| 219 | |
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| 220 | if (ret == NULL) |
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| 221 | return NULL; |
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| 222 | |
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| 223 | if ( locked ) { |
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| 224 | if ( roar_mm_mlock(ret, len) == -1 ) { |
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| 225 | roar_mm_free(ret); |
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| 226 | return NULL; |
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| 227 | } |
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| 228 | } |
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| 229 | |
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| 230 | if ( roar_random_gen(ret, len, quality) == -1 ) { |
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| 231 | roar_mm_free(ret); |
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| 232 | return NULL; |
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| 233 | } |
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| 234 | |
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| 235 | return ret; |
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| 236 | } |
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| 237 | |
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[4446] | 238 | //ll |
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