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 <openssl/rand.h> 62 #include <openssl/engine.h> 63 64 static ENGINE *rand_engine=NULL; 65 66 #if 0 67 void RAND_set_rand_method(RAND_METHOD *meth) 68 { 69 rand_meth=meth; 70 } 71 #else 72 int RAND_set_rand_method(ENGINE *engine) 73 { 74 ENGINE *mtmp; 75 mtmp = rand_engine; 76 if (!ENGINE_init(engine)) 77 return 0; 78 rand_engine = engine; 79 /* SHOULD ERROR CHECK THIS!!! */ 80 ENGINE_finish(mtmp); 81 return 1; 82 } 83 #endif 84 85 RAND_METHOD *RAND_get_rand_method(void) 86 { 87 if (rand_engine == NULL 88 && (rand_engine = ENGINE_get_default_RAND()) == NULL) 89 return NULL; 90 return ENGINE_get_RAND(rand_engine); 91 } 92 93 void RAND_cleanup(void) 94 { 95 RAND_METHOD *meth = RAND_get_rand_method(); 96 if (meth && meth->cleanup) 97 meth->cleanup(); 98 } 99 100 void RAND_seed(const void *buf, int num) 101 { 102 RAND_METHOD *meth = RAND_get_rand_method(); 103 if (meth && meth->seed) 104 meth->seed(buf,num); 105 } 106 107 void RAND_add(const void *buf, int num, double entropy) 108 { 109 RAND_METHOD *meth = RAND_get_rand_method(); 110 if (meth && meth->add) 111 meth->add(buf,num,entropy); 112 } 113 114 int RAND_bytes(unsigned char *buf, int num) 115 { 116 RAND_METHOD *meth = RAND_get_rand_method(); 117 if (meth && meth->bytes) 118 return meth->bytes(buf,num); 119 return(-1); 120 } 121 122 int RAND_pseudo_bytes(unsigned char *buf, int num) 123 { 124 RAND_METHOD *meth = RAND_get_rand_method(); 125 if (meth && meth->pseudorand) 126 return meth->pseudorand(buf,num); 127 return(-1); 128 } 129 130 int RAND_status(void) 131 { 132 RAND_METHOD *meth = RAND_get_rand_method(); 133 if (meth && meth->status) 134 return meth->status(); 135 return 0; 136 } 137