1 /* crypto/rand/rand_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 #include <time.h> 61 #include "cryptlib.h" 62 #include <openssl/rand.h> 63 #include "rand_lcl.h" 64 #ifdef OPENSSL_FIPS 65 #include <openssl/fips.h> 66 #include <openssl/fips_rand.h> 67 #endif 68 69 #ifndef OPENSSL_NO_ENGINE 70 #include <openssl/engine.h> 71 #endif 72 73 static const RAND_METHOD *default_RAND_meth = NULL; 74 75 #ifdef OPENSSL_FIPS 76 77 static int fips_RAND_set_rand_method(const RAND_METHOD *meth, 78 const RAND_METHOD **pmeth) 79 { 80 *pmeth = meth; 81 return 1; 82 } 83 84 static const RAND_METHOD *fips_RAND_get_rand_method(const RAND_METHOD **pmeth) 85 { 86 if (!*pmeth) 87 { 88 if(FIPS_mode()) 89 *pmeth=FIPS_rand_method(); 90 else 91 *pmeth = RAND_SSLeay(); 92 } 93 94 if(FIPS_mode() 95 && *pmeth != FIPS_rand_check()) 96 { 97 RANDerr(RAND_F_FIPS_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD); 98 return 0; 99 } 100 101 return *pmeth; 102 } 103 104 static int (*RAND_set_rand_method_func)(const RAND_METHOD *meth, 105 const RAND_METHOD **pmeth) 106 = fips_RAND_set_rand_method; 107 static const RAND_METHOD *(*RAND_get_rand_method_func) 108 (const RAND_METHOD **pmeth) 109 = fips_RAND_get_rand_method; 110 111 #ifndef OPENSSL_NO_ENGINE 112 void int_RAND_set_callbacks( 113 int (*set_rand_func)(const RAND_METHOD *meth, 114 const RAND_METHOD **pmeth), 115 const RAND_METHOD *(*get_rand_func) 116 (const RAND_METHOD **pmeth)) 117 { 118 RAND_set_rand_method_func = set_rand_func; 119 RAND_get_rand_method_func = get_rand_func; 120 } 121 #endif 122 123 int RAND_set_rand_method(const RAND_METHOD *meth) 124 { 125 return RAND_set_rand_method_func(meth, &default_RAND_meth); 126 } 127 128 const RAND_METHOD *RAND_get_rand_method(void) 129 { 130 return RAND_get_rand_method_func(&default_RAND_meth); 131 } 132 133 #else 134 135 #ifndef OPENSSL_NO_ENGINE 136 /* non-NULL if default_RAND_meth is ENGINE-provided */ 137 static ENGINE *funct_ref =NULL; 138 #endif 139 140 int RAND_set_rand_method(const RAND_METHOD *meth) 141 { 142 #ifndef OPENSSL_NO_ENGINE 143 if(funct_ref) 144 { 145 ENGINE_finish(funct_ref); 146 funct_ref = NULL; 147 } 148 #endif 149 default_RAND_meth = meth; 150 return 1; 151 } 152 153 const RAND_METHOD *RAND_get_rand_method(void) 154 { 155 if (!default_RAND_meth) 156 { 157 #ifndef OPENSSL_NO_ENGINE 158 ENGINE *e = ENGINE_get_default_RAND(); 159 if(e) 160 { 161 default_RAND_meth = ENGINE_get_RAND(e); 162 if(!default_RAND_meth) 163 { 164 ENGINE_finish(e); 165 e = NULL; 166 } 167 } 168 if(e) 169 funct_ref = e; 170 else 171 #endif 172 default_RAND_meth = RAND_SSLeay(); 173 } 174 return default_RAND_meth; 175 } 176 177 #ifndef OPENSSL_NO_ENGINE 178 int RAND_set_rand_engine(ENGINE *engine) 179 { 180 const RAND_METHOD *tmp_meth = NULL; 181 if(engine) 182 { 183 if(!ENGINE_init(engine)) 184 return 0; 185 tmp_meth = ENGINE_get_RAND(engine); 186 if(!tmp_meth) 187 { 188 ENGINE_finish(engine); 189 return 0; 190 } 191 } 192 /* This function releases any prior ENGINE so call it first */ 193 RAND_set_rand_method(tmp_meth); 194 funct_ref = engine; 195 return 1; 196 } 197 #endif 198 199 #endif 200 201 void RAND_cleanup(void) 202 { 203 const RAND_METHOD *meth = RAND_get_rand_method(); 204 if (meth && meth->cleanup) 205 meth->cleanup(); 206 RAND_set_rand_method(NULL); 207 } 208 209 void RAND_seed(const void *buf, int num) 210 { 211 const RAND_METHOD *meth = RAND_get_rand_method(); 212 if (meth && meth->seed) 213 meth->seed(buf,num); 214 } 215 216 void RAND_add(const void *buf, int num, double entropy) 217 { 218 const RAND_METHOD *meth = RAND_get_rand_method(); 219 if (meth && meth->add) 220 meth->add(buf,num,entropy); 221 } 222 223 int RAND_bytes(unsigned char *buf, int num) 224 { 225 const RAND_METHOD *meth = RAND_get_rand_method(); 226 if (meth && meth->bytes) 227 return meth->bytes(buf,num); 228 return(-1); 229 } 230 231 int RAND_pseudo_bytes(unsigned char *buf, int num) 232 { 233 const RAND_METHOD *meth = RAND_get_rand_method(); 234 if (meth && meth->pseudorand) 235 return meth->pseudorand(buf,num); 236 return(-1); 237 } 238 239 int RAND_status(void) 240 { 241 const RAND_METHOD *meth = RAND_get_rand_method(); 242 if (meth && meth->status) 243 return meth->status(); 244 return 0; 245 } 246