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1 /* crypto/rand/rand_lib.c */ |
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2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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3 * All rights reserved. |
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4 * |
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5 * This package is an SSL implementation written |
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6 * by Eric Young (eay@cryptsoft.com). |
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7 * The implementation was written so as to conform with Netscapes SSL. |
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8 * |
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9 * This library is free for commercial and non-commercial use as long as |
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10 * the following conditions are aheared to. The following conditions |
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11 * apply to all code found in this distribution, be it the RC4, RSA, |
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12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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13 * included with this distribution is covered by the same copyright terms |
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14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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15 * |
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16 * Copyright remains Eric Young's, and as such any Copyright notices in |
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17 * the code are not to be removed. |
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18 * If this package is used in a product, Eric Young should be given attribution |
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19 * as the author of the parts of the library used. |
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20 * This can be in the form of a textual message at program startup or |
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21 * in documentation (online or textual) provided with the package. |
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22 * |
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23 * Redistribution and use in source and binary forms, with or without |
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24 * modification, are permitted provided that the following conditions |
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25 * are met: |
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26 * 1. Redistributions of source code must retain the copyright |
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27 * notice, this list of conditions and the following disclaimer. |
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28 * 2. Redistributions in binary form must reproduce the above copyright |
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29 * notice, this list of conditions and the following disclaimer in the |
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30 * documentation and/or other materials provided with the distribution. |
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31 * 3. All advertising materials mentioning features or use of this software |
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32 * must display the following acknowledgement: |
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33 * "This product includes cryptographic software written by |
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34 * Eric Young (eay@cryptsoft.com)" |
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35 * The word 'cryptographic' can be left out if the rouines from the library |
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36 * being used are not cryptographic related :-). |
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37 * 4. If you include any Windows specific code (or a derivative thereof) from |
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38 * the apps directory (application code) you must include an acknowledgement: |
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39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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40 * |
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41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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51 * SUCH DAMAGE. |
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52 * |
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53 * The licence and distribution terms for any publically available version or |
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54 * derivative of this code cannot be changed. i.e. this code cannot simply be |
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55 * copied and put under another distribution licence |
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56 * [including the GNU Public Licence.] |
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57 */ |
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58 /* |
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59 © Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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60 */ |
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61 |
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62 |
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63 #include <stdio.h> |
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64 #include <time.h> |
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65 #include "cryptlib.h" |
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66 #include <openssl/rand.h> |
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67 #ifndef OPENSSL_NO_ENGINE |
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68 #include <openssl/engine.h> |
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69 #endif |
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70 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__))) |
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71 #include "libcrypto_wsd_macros.h" |
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72 #include "libcrypto_wsd.h" |
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73 #endif |
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74 |
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75 |
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76 #ifndef OPENSSL_NO_ENGINE |
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77 /* non-NULL if default_RAND_meth is ENGINE-provided */ |
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78 static ENGINE *funct_ref =NULL; |
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79 #endif |
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80 #ifndef EMULATOR |
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81 static const RAND_METHOD *default_RAND_meth = NULL; |
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82 #else |
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83 GET_STATIC_VAR_FROM_TLS(default_RAND_meth,rand_lib,const RAND_METHOD *) |
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84 #define default_RAND_meth (*GET_WSD_VAR_NAME(default_RAND_meth,rand_lib, s)()) |
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85 #endif |
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86 |
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87 EXPORT_C int RAND_set_rand_method(const RAND_METHOD *meth) |
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88 { |
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89 #ifndef OPENSSL_NO_ENGINE |
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90 if(funct_ref) |
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91 { |
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92 ENGINE_finish(funct_ref); |
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93 funct_ref = NULL; |
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94 } |
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95 #endif |
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96 default_RAND_meth = meth; |
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97 return 1; |
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98 } |
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99 |
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100 EXPORT_C const RAND_METHOD *RAND_get_rand_method(void) |
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101 { |
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102 if (!default_RAND_meth) |
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103 { |
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104 #ifndef OPENSSL_NO_ENGINE |
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105 ENGINE *e = ENGINE_get_default_RAND(); |
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106 if(e) |
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107 { |
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108 default_RAND_meth = ENGINE_get_RAND(e); |
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109 if(!default_RAND_meth) |
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110 { |
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111 ENGINE_finish(e); |
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112 e = NULL; |
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113 } |
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114 } |
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115 if(e) |
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116 funct_ref = e; |
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117 else |
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118 #endif |
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119 default_RAND_meth = RAND_SSLeay(); |
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120 } |
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121 return default_RAND_meth; |
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122 } |
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123 |
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124 #ifndef OPENSSL_NO_ENGINE |
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125 EXPORT_C int RAND_set_rand_engine(ENGINE *engine) |
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126 { |
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127 const RAND_METHOD *tmp_meth = NULL; |
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128 if(engine) |
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129 { |
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130 if(!ENGINE_init(engine)) |
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131 return 0; |
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132 tmp_meth = ENGINE_get_RAND(engine); |
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133 if(!tmp_meth) |
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134 { |
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135 ENGINE_finish(engine); |
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136 return 0; |
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137 } |
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138 } |
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139 /* This function releases any prior ENGINE so call it first */ |
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140 RAND_set_rand_method(tmp_meth); |
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141 funct_ref = engine; |
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142 return 1; |
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143 } |
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144 #endif |
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145 |
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146 EXPORT_C void RAND_cleanup(void) |
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147 { |
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148 const RAND_METHOD *meth = RAND_get_rand_method(); |
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149 if (meth && meth->cleanup) |
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150 meth->cleanup(); |
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151 RAND_set_rand_method(NULL); |
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152 } |
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153 |
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154 EXPORT_C void RAND_seed(const void *buf, int num) |
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155 { |
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156 const RAND_METHOD *meth = RAND_get_rand_method(); |
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157 if (meth && meth->seed) |
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158 meth->seed(buf,num); |
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159 } |
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160 |
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161 EXPORT_C void RAND_add(const void *buf, int num, double entropy) |
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162 { |
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163 const RAND_METHOD *meth = RAND_get_rand_method(); |
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164 if (meth && meth->add) |
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165 meth->add(buf,num,entropy); |
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166 } |
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167 |
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168 EXPORT_C int RAND_bytes(unsigned char *buf, int num) |
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169 { |
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170 const RAND_METHOD *meth = RAND_get_rand_method(); |
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171 if (meth && meth->bytes) |
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172 return meth->bytes(buf,num); |
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173 return(-1); |
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174 } |
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175 |
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176 EXPORT_C int RAND_pseudo_bytes(unsigned char *buf, int num) |
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177 { |
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178 const RAND_METHOD *meth = RAND_get_rand_method(); |
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179 if (meth && meth->pseudorand) |
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180 return meth->pseudorand(buf,num); |
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181 return(-1); |
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182 } |
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183 |
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184 EXPORT_C int RAND_status(void) |
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185 { |
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186 const RAND_METHOD *meth = RAND_get_rand_method(); |
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187 if (meth && meth->status) |
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188 return meth->status(); |
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189 return 0; |
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190 } |