Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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> |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 63 | #ifndef OPENSSL_NO_ENGINE |
| 64 | #include <openssl/engine.h> |
| 65 | #endif |
| 66 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | } |