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 | |
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50 | inited = 1; |
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51 | } |
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52 | |
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53 | int roar_random_gen(void * buffer, size_t len, int quality) { |
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54 | if ( len == 0 ) |
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55 | return 0; |
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56 | |
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57 | if ( buffer == NULL ) |
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58 | return -1; |
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59 | |
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60 | roar_random_init(); |
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61 | |
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62 | switch (quality) { |
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63 | case ROAR_RANDOM_NONE: |
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64 | // no entropy: |
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65 | memset(buffer, 0, len); |
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66 | break; |
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67 | #ifdef ROAR_HAVE_LIBGCRYPT |
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68 | case ROAR_RANDOM_VERY_WEAK: |
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69 | case ROAR_RANDOM_WEAK: |
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70 | gcry_create_nonce(buffer, len); |
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71 | break; |
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72 | case ROAR_RANDOM_NORMAL: |
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73 | case ROAR_RANDOM_STRONG: |
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74 | gcry_randomize(buffer, len, GCRY_STRONG_RANDOM); |
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75 | break; |
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76 | case ROAR_RANDOM_VERY_STRONG: |
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77 | gcry_randomize(buffer, len, GCRY_VERY_STRONG_RANDOM); |
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78 | break; |
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79 | #endif |
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80 | default: |
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81 | return -1; |
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82 | break; |
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83 | } |
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84 | |
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85 | return 0; |
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86 | } |
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87 | |
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88 | void * roar_random_genbuf(size_t len, int quality, int locked) { |
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89 | void * ret = roar_mm_malloc(len); |
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90 | |
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91 | if (ret == NULL) |
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92 | return NULL; |
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93 | |
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94 | if ( locked ) { |
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95 | if ( roar_mm_mlock(ret, len) == -1 ) { |
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96 | roar_mm_free(ret); |
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97 | return NULL; |
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98 | } |
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99 | } |
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100 | |
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101 | if ( roar_random_gen(ret, len, quality) == -1 ) { |
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102 | roar_mm_free(ret); |
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103 | return NULL; |
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104 | } |
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105 | |
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106 | return ret; |
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107 | } |
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108 | |
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109 | //ll |
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