sl@0: /* crypto/rand/rand_lib.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <time.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/rand.h>
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: #include <openssl/engine.h>
sl@0: #endif
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: 
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: /* non-NULL if default_RAND_meth is ENGINE-provided */
sl@0: static ENGINE *funct_ref =NULL;
sl@0: #endif
sl@0: #ifndef EMULATOR
sl@0: static const RAND_METHOD *default_RAND_meth = NULL;
sl@0: #else
sl@0: GET_STATIC_VAR_FROM_TLS(default_RAND_meth,rand_lib,const RAND_METHOD *)
sl@0: #define default_RAND_meth (*GET_WSD_VAR_NAME(default_RAND_meth,rand_lib, s)())
sl@0: #endif
sl@0: 
sl@0: EXPORT_C int RAND_set_rand_method(const RAND_METHOD *meth)
sl@0: 	{
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if(funct_ref)
sl@0: 		{
sl@0: 		ENGINE_finish(funct_ref);
sl@0: 		funct_ref = NULL;
sl@0: 		}
sl@0: #endif
sl@0: 	default_RAND_meth = meth;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const RAND_METHOD *RAND_get_rand_method(void)
sl@0: 	{
sl@0: 	if (!default_RAND_meth)
sl@0: 		{
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 		ENGINE *e = ENGINE_get_default_RAND();
sl@0: 		if(e)
sl@0: 			{
sl@0: 			default_RAND_meth = ENGINE_get_RAND(e);
sl@0: 			if(!default_RAND_meth)
sl@0: 				{
sl@0: 				ENGINE_finish(e);
sl@0: 				e = NULL;
sl@0: 				}
sl@0: 			}
sl@0: 		if(e)
sl@0: 			funct_ref = e;
sl@0: 		else
sl@0: #endif
sl@0: 			default_RAND_meth = RAND_SSLeay();
sl@0: 		}
sl@0: 	return default_RAND_meth;
sl@0: 	}
sl@0: 
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: EXPORT_C int RAND_set_rand_engine(ENGINE *engine)
sl@0: 	{
sl@0: 	const RAND_METHOD *tmp_meth = NULL;
sl@0: 	if(engine)
sl@0: 		{
sl@0: 		if(!ENGINE_init(engine))
sl@0: 			return 0;
sl@0: 		tmp_meth = ENGINE_get_RAND(engine);
sl@0: 		if(!tmp_meth)
sl@0: 			{
sl@0: 			ENGINE_finish(engine);
sl@0: 			return 0;
sl@0: 			}
sl@0: 		}
sl@0: 	/* This function releases any prior ENGINE so call it first */
sl@0: 	RAND_set_rand_method(tmp_meth);
sl@0: 	funct_ref = engine;
sl@0: 	return 1;
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: EXPORT_C void RAND_cleanup(void)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->cleanup)
sl@0: 		meth->cleanup();
sl@0: 	RAND_set_rand_method(NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void RAND_seed(const void *buf, int num)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->seed)
sl@0: 		meth->seed(buf,num);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void RAND_add(const void *buf, int num, double entropy)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->add)
sl@0: 		meth->add(buf,num,entropy);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int RAND_bytes(unsigned char *buf, int num)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->bytes)
sl@0: 		return meth->bytes(buf,num);
sl@0: 	return(-1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int RAND_pseudo_bytes(unsigned char *buf, int num)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->pseudorand)
sl@0: 		return meth->pseudorand(buf,num);
sl@0: 	return(-1);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int RAND_status(void)
sl@0: 	{
sl@0: 	const RAND_METHOD *meth = RAND_get_rand_method();
sl@0: 	if (meth && meth->status)
sl@0: 		return meth->status();
sl@0: 	return 0;
sl@0: 	}