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