/* crypto/engine/tb_ecdh.c */

/* ====================================================================

 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.

 *

 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included

 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed

 * to the OpenSSL project.

 *

 * The ECC Code is licensed pursuant to the OpenSSL open source

 * license provided below.

 *

 * The ECDH engine software is originally written by Nils Gura and

 * Douglas Stebila of Sun Microsystems Laboratories.

 *

 */

/* ====================================================================

 * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

 /*

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

 */

#include "eng_int.h"

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

#include "libcrypto_wsd_macros.h"

#include "libcrypto_wsd.h"

#endif

/* If this symbol is defined then ENGINE_get_default_ECDH(), the function that is

 * used by ECDH to hook in implementation code and cache defaults (etc), will

 * display brief debugging summaries to stderr with the 'nid'. */

/* #define ENGINE_ECDH_DEBUG */

#ifndef EMULATOR

static ENGINE_TABLE *ecdh_table = NULL;

#else

GET_STATIC_VAR_FROM_TLS(ecdh_table,tb_ecdh,ENGINE_TABLE *)

#define ecdh_table (*GET_WSD_VAR_NAME(ecdh_table,tb_ecdh, s)())

#endif

static const int dummy_nid = 1;

void ENGINE_unregister_ECDH(ENGINE *e)

	{

	engine_table_unregister(&ecdh_table, e);

	}

static void engine_unregister_all_ECDH(void)

	{

	engine_table_cleanup(&ecdh_table);

	}

int ENGINE_register_ECDH(ENGINE *e)

	{

	if(e->ecdh_meth)

		return engine_table_register(&ecdh_table,

				engine_unregister_all_ECDH, e, &dummy_nid, 1, 0);

	return 1;

	}

void ENGINE_register_all_ECDH()

	{

	ENGINE *e;

	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))

		ENGINE_register_ECDH(e);

	}

int ENGINE_set_default_ECDH(ENGINE *e)

	{

	if(e->ecdh_meth)

		return engine_table_register(&ecdh_table,

				engine_unregister_all_ECDH, e, &dummy_nid, 1, 1);

	return 1;

	}

/* Exposed API function to get a functional reference from the implementation

 * table (ie. try to get a functional reference from the tabled structural

 * references). */

ENGINE *ENGINE_get_default_ECDH(void)

	{

	return engine_table_select(&ecdh_table, dummy_nid);

	}

/* Obtains an ECDH implementation from an ENGINE functional reference */

const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e)

	{

	return e->ecdh_meth;

	}

/* Sets an ECDH implementation in an ENGINE structure */

int ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth)

	{

	e->ecdh_meth = ecdh_meth;

	return 1;

	}