/* crypto/rand/rand_lib.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <stdio.h> #include <time.h> #include "cryptlib.h" #include <openssl/rand.h> #ifndef OPENSSL_NO_ENGINE #include <openssl/engine.h> #endif #ifndef OPENSSL_NO_ENGINE /* non-NULL if default_RAND_meth is ENGINE-provided */ static ENGINE *funct_ref =NULL; #endif static const RAND_METHOD *default_RAND_meth = NULL; int RAND_set_rand_method(const RAND_METHOD *meth) { #ifndef OPENSSL_NO_ENGINE if(funct_ref) { ENGINE_finish(funct_ref); funct_ref = NULL; } #endif default_RAND_meth = meth; return 1; } const RAND_METHOD *RAND_get_rand_method(void) { if (!default_RAND_meth) { #ifndef OPENSSL_NO_ENGINE ENGINE *e = ENGINE_get_default_RAND(); if(e) { default_RAND_meth = ENGINE_get_RAND(e); if(!default_RAND_meth) { ENGINE_finish(e); e = NULL; } } if(e) funct_ref = e; else #endif default_RAND_meth = RAND_SSLeay(); } return default_RAND_meth; } #ifndef OPENSSL_NO_ENGINE int RAND_set_rand_engine(ENGINE *engine) { const RAND_METHOD *tmp_meth = NULL; if(engine) { if(!ENGINE_init(engine)) return 0; tmp_meth = ENGINE_get_RAND(engine); if(!tmp_meth) { ENGINE_finish(engine); return 0; } } /* This function releases any prior ENGINE so call it first */ RAND_set_rand_method(tmp_meth); funct_ref = engine; return 1; } #endif void RAND_cleanup(void) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->cleanup) meth->cleanup(); RAND_set_rand_method(NULL); } void RAND_seed(const void *buf, int num) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->seed) meth->seed(buf,num); } void RAND_add(const void *buf, int num, double entropy) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->add) meth->add(buf,num,entropy); } int RAND_bytes(unsigned char *buf, int num) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->bytes) return meth->bytes(buf,num); return(-1); } int RAND_pseudo_bytes(unsigned char *buf, int num) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->pseudorand) return meth->pseudorand(buf,num); return(-1); } int RAND_status(void) { const RAND_METHOD *meth = RAND_get_rand_method(); if (meth && meth->status) return meth->status(); return 0; }