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 #ifndef OPENSSL_NO_ENGINE 64 #include <openssl/engine.h> 65 #endif 66 #include <openssl/fips.h> 67 #include <openssl/fips_rand.h> 68 69 #ifndef OPENSSL_NO_ENGINE 70 /* non-NULL if default_RAND_meth is ENGINE-provided */ 71 static ENGINE *funct_ref =NULL; 72 #endif 73 static const RAND_METHOD *default_RAND_meth = NULL; 74 75 int RAND_set_rand_method(const RAND_METHOD *meth) 76 { 77 #ifndef OPENSSL_NO_ENGINE 78 if(funct_ref) 79 { 80 ENGINE_finish(funct_ref); 81 funct_ref = NULL; 82 } 83 #endif 84 default_RAND_meth = meth; 85 return 1; 86 } 87 88 const RAND_METHOD *RAND_get_rand_method(void) 89 { 90 #ifdef OPENSSL_FIPS 91 if(FIPS_mode() 92 && default_RAND_meth != FIPS_rand_check()) 93 { 94 RANDerr(RAND_F_RAND_GET_RAND_METHOD,RAND_R_NON_FIPS_METHOD); 95 return 0; 96 } 97 #endif 98 99 100 if (!default_RAND_meth) 101 { 102 #ifndef OPENSSL_NO_ENGINE 103 ENGINE *e = ENGINE_get_default_RAND(); 104 if(e) 105 { 106 default_RAND_meth = ENGINE_get_RAND(e); 107 if(!default_RAND_meth) 108 { 109 ENGINE_finish(e); 110 e = NULL; 111 } 112 } 113 if(e) 114 funct_ref = e; 115 else 116 #endif 117 default_RAND_meth = RAND_SSLeay(); 118 } 119 return default_RAND_meth; 120 } 121 122 #ifndef OPENSSL_NO_ENGINE 123 int RAND_set_rand_engine(ENGINE *engine) 124 { 125 const RAND_METHOD *tmp_meth = NULL; 126 if(engine) 127 { 128 if(!ENGINE_init(engine)) 129 return 0; 130 tmp_meth = ENGINE_get_RAND(engine); 131 if(!tmp_meth) 132 { 133 ENGINE_finish(engine); 134 return 0; 135 } 136 } 137 /* This function releases any prior ENGINE so call it first */ 138 RAND_set_rand_method(tmp_meth); 139 funct_ref = engine; 140 return 1; 141 } 142 #endif 143 144 void RAND_cleanup(void) 145 { 146 const RAND_METHOD *meth = RAND_get_rand_method(); 147 if (meth && meth->cleanup) 148 meth->cleanup(); 149 RAND_set_rand_method(NULL); 150 } 151 152 void RAND_seed(const void *buf, int num) 153 { 154 const RAND_METHOD *meth = RAND_get_rand_method(); 155 if (meth && meth->seed) 156 meth->seed(buf,num); 157 } 158 159 void RAND_add(const void *buf, int num, double entropy) 160 { 161 const RAND_METHOD *meth = RAND_get_rand_method(); 162 if (meth && meth->add) 163 meth->add(buf,num,entropy); 164 } 165 166 int RAND_bytes(unsigned char *buf, int num) 167 { 168 const RAND_METHOD *meth = RAND_get_rand_method(); 169 if (meth && meth->bytes) 170 return meth->bytes(buf,num); 171 return(-1); 172 } 173 174 int RAND_pseudo_bytes(unsigned char *buf, int num) 175 { 176 const RAND_METHOD *meth = RAND_get_rand_method(); 177 if (meth && meth->pseudorand) 178 return meth->pseudorand(buf,num); 179 return(-1); 180 } 181 182 int RAND_status(void) 183 { 184 const RAND_METHOD *meth = RAND_get_rand_method(); 185 if (meth && meth->status) 186 return meth->status(); 187 return 0; 188 } 189