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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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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49 | roar_crypto_init(); |
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50 | |
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51 | inited = 1; |
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52 | } |
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53 | |
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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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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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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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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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173 | //ll |
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