rand_lib.c revision 109998
155714Skris/* crypto/rand/rand_lib.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <stdio.h> 6055714Skris#include <time.h> 61109998Smarkm#include "cryptlib.h" 6255714Skris#include <openssl/rand.h> 63109998Smarkm#include <openssl/engine.h> 6455714Skris 65109998Smarkm/* non-NULL if default_RAND_meth is ENGINE-provided */ 66109998Smarkmstatic ENGINE *funct_ref =NULL; 67109998Smarkmstatic const RAND_METHOD *default_RAND_meth = NULL; 6855714Skris 69109998Smarkmint RAND_set_rand_method(const RAND_METHOD *meth) 7055714Skris { 71109998Smarkm if(funct_ref) 72109998Smarkm { 73109998Smarkm ENGINE_finish(funct_ref); 74109998Smarkm funct_ref = NULL; 75109998Smarkm } 76109998Smarkm default_RAND_meth = meth; 77109998Smarkm return 1; 7855714Skris } 7955714Skris 80109998Smarkmconst RAND_METHOD *RAND_get_rand_method(void) 8155714Skris { 82109998Smarkm if (!default_RAND_meth) 83109998Smarkm { 84109998Smarkm ENGINE *e = ENGINE_get_default_RAND(); 85109998Smarkm if(e) 86109998Smarkm { 87109998Smarkm default_RAND_meth = ENGINE_get_RAND(e); 88109998Smarkm if(!default_RAND_meth) 89109998Smarkm { 90109998Smarkm ENGINE_finish(e); 91109998Smarkm e = NULL; 92109998Smarkm } 93109998Smarkm } 94109998Smarkm if(e) 95109998Smarkm funct_ref = e; 96109998Smarkm else 97109998Smarkm default_RAND_meth = RAND_SSLeay(); 98109998Smarkm } 99109998Smarkm return default_RAND_meth; 10055714Skris } 10155714Skris 102109998Smarkmint RAND_set_rand_engine(ENGINE *engine) 103109998Smarkm { 104109998Smarkm const RAND_METHOD *tmp_meth = NULL; 105109998Smarkm if(engine) 106109998Smarkm { 107109998Smarkm if(!ENGINE_init(engine)) 108109998Smarkm return 0; 109109998Smarkm tmp_meth = ENGINE_get_RAND(engine); 110109998Smarkm if(!tmp_meth) 111109998Smarkm { 112109998Smarkm ENGINE_finish(engine); 113109998Smarkm return 0; 114109998Smarkm } 115109998Smarkm } 116109998Smarkm /* This function releases any prior ENGINE so call it first */ 117109998Smarkm RAND_set_rand_method(tmp_meth); 118109998Smarkm funct_ref = engine; 119109998Smarkm return 1; 120109998Smarkm } 121109998Smarkm 12255714Skrisvoid RAND_cleanup(void) 12355714Skris { 124109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 125109998Smarkm if (meth && meth->cleanup) 126109998Smarkm meth->cleanup(); 127109998Smarkm RAND_set_rand_method(NULL); 12855714Skris } 12955714Skris 13055714Skrisvoid RAND_seed(const void *buf, int num) 13155714Skris { 132109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 133109998Smarkm if (meth && meth->seed) 134109998Smarkm meth->seed(buf,num); 13555714Skris } 13655714Skris 13759191Skrisvoid RAND_add(const void *buf, int num, double entropy) 13855714Skris { 139109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 140109998Smarkm if (meth && meth->add) 141109998Smarkm meth->add(buf,num,entropy); 14255714Skris } 14355714Skris 14459191Skrisint RAND_bytes(unsigned char *buf, int num) 14559191Skris { 146109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 147109998Smarkm if (meth && meth->bytes) 148109998Smarkm return meth->bytes(buf,num); 14959191Skris return(-1); 15059191Skris } 15159191Skris 15259191Skrisint RAND_pseudo_bytes(unsigned char *buf, int num) 15359191Skris { 154109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 155109998Smarkm if (meth && meth->pseudorand) 156109998Smarkm return meth->pseudorand(buf,num); 15759191Skris return(-1); 15859191Skris } 15959191Skris 16059191Skrisint RAND_status(void) 16159191Skris { 162109998Smarkm const RAND_METHOD *meth = RAND_get_rand_method(); 163109998Smarkm if (meth && meth->status) 164109998Smarkm return meth->status(); 16559191Skris return 0; 16659191Skris } 167