tb_ecdh.c

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/* 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/)"
 *
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 *    prior written permission. For written permission, please contact
 *    [email protected].
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 * 5. Products derived from this software may not be called "OpenSSL"
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
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 *
 * 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
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 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
 *
 */

#include "eng_int.h"

/* 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 */

static ENGINE_TABLE *ecdh_table = NULL;
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;
    }