/* 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.]

 */

/*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stdio.h>

#include <time.h>

#include "cryptlib.h"

#include <openssl/rand.h>

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

#ifndef OPENSSL_NO_ENGINE

/* non-NULL if default_RAND_meth is ENGINE-provided */

static ENGINE *funct_ref =NULL;

#endif

#ifndef EMULATOR

static const RAND_METHOD *default_RAND_meth = NULL;

#else

GET_STATIC_VAR_FROM_TLS(default_RAND_meth,rand_lib,const RAND_METHOD *)

#define default_RAND_meth (*GET_WSD_VAR_NAME(default_RAND_meth,rand_lib, s)())

#endif

EXPORT_C 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;

	}

EXPORT_C 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

EXPORT_C 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

EXPORT_C void RAND_cleanup(void)

	{

	const RAND_METHOD *meth = RAND_get_rand_method();

	if (meth && meth->cleanup)

		meth->cleanup();

	RAND_set_rand_method(NULL);

	}

EXPORT_C void RAND_seed(const void *buf, int num)

	{

	const RAND_METHOD *meth = RAND_get_rand_method();

	if (meth && meth->seed)

		meth->seed(buf,num);

	}

EXPORT_C 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);

	}

EXPORT_C 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);

	}

EXPORT_C 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);

	}

EXPORT_C int RAND_status(void)

	{

	const RAND_METHOD *meth = RAND_get_rand_method();

	if (meth && meth->status)

		return meth->status();

	return 0;

	}