/* crypto/ecdh/ech_lib.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 software is originally written by Douglas Stebila of

 * Sun Microsystems Laboratories.

 *

 */

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

 * Copyright (c) 1998-2003 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

 *    openssl-core@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).

 *

 */

#include "ech_locl.h"

#include <string.h>

#ifndef OPENSSL_NO_ENGINE

# include <openssl/engine.h>

#endif

#include <openssl/err.h>

#ifdef OPENSSL_FIPS

# include <openssl/fips.h>

#endif

const char ECDH_version[] = "ECDH" OPENSSL_VERSION_PTEXT;

static const ECDH_METHOD *default_ECDH_method = NULL;

static void *ecdh_data_new(void);

static void *ecdh_data_dup(void *);

static void ecdh_data_free(void *);

void ECDH_set_default_method(const ECDH_METHOD *meth)

{

    default_ECDH_method = meth;

}

const ECDH_METHOD *ECDH_get_default_method(void)

{

    if (!default_ECDH_method) {

#ifdef OPENSSL_FIPS

        if (FIPS_mode())

            return FIPS_ecdh_openssl();

        else

            return ECDH_OpenSSL();

#else

        default_ECDH_method = ECDH_OpenSSL();

#endif

    }

    return default_ECDH_method;

}

int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)

{

    ECDH_DATA *ecdh;

    ecdh = ecdh_check(eckey);

    if (ecdh == NULL)

        return 0;

#if 0

    mtmp = ecdh->meth;

    if (mtmp->finish)

        mtmp->finish(eckey);

#endif

#ifndef OPENSSL_NO_ENGINE

    if (ecdh->engine) {

        ENGINE_finish(ecdh->engine);

        ecdh->engine = NULL;

    }

#endif

    ecdh->meth = meth;

#if 0

    if (meth->init)

        meth->init(eckey);

#endif

    return 1;

}

static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)

{

    ECDH_DATA *ret;

    ret = (ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));

    if (ret == NULL) {

        ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);

        return (NULL);

    }

    ret->init = NULL;

    ret->meth = ECDH_get_default_method();

    ret->engine = engine;

#ifndef OPENSSL_NO_ENGINE

    if (!ret->engine)

        ret->engine = ENGINE_get_default_ECDH();

    if (ret->engine) {

        ret->meth = ENGINE_get_ECDH(ret->engine);

        if (!ret->meth) {

            ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);

            ENGINE_finish(ret->engine);

            OPENSSL_free(ret);

            return NULL;

        }

    }

#endif

    ret->flags = ret->meth->flags;

    CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);

#if 0

    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {

        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);

        OPENSSL_free(ret);

        ret = NULL;

    }

#endif

    return (ret);

}

static void *ecdh_data_new(void)

{

    return (void *)ECDH_DATA_new_method(NULL);

}

static void *ecdh_data_dup(void *data)

{

    ECDH_DATA *r = (ECDH_DATA *)data;

    /* XXX: dummy operation */

    if (r == NULL)

        return NULL;

    return (void *)ecdh_data_new();

}

void ecdh_data_free(void *data)

{

    ECDH_DATA *r = (ECDH_DATA *)data;

#ifndef OPENSSL_NO_ENGINE

    if (r->engine)

        ENGINE_finish(r->engine);

#endif

    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);

    OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));

    OPENSSL_free(r);

}

ECDH_DATA *ecdh_check(EC_KEY *key)

{

    ECDH_DATA *ecdh_data;

    void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,

                                            ecdh_data_free, ecdh_data_free);

    if (data == NULL) {

        ecdh_data = (ECDH_DATA *)ecdh_data_new();

        if (ecdh_data == NULL)

            return NULL;

        data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,

                                             ecdh_data_dup, ecdh_data_free,

                                             ecdh_data_free);

        if (data != NULL) {

            /*

             * Another thread raced us to install the key_method data and

             * won.

             */

            ecdh_data_free(ecdh_data);

            ecdh_data = (ECDH_DATA *)data;

        } else if (EC_KEY_get_key_method_data(key, ecdh_data_dup,

                                              ecdh_data_free,

                                              ecdh_data_free) != ecdh_data) {

            /* Or an out of memory error in EC_KEY_insert_key_method_data. */

            ecdh_data_free(ecdh_data);

            return NULL;

        }

    } else {

        ecdh_data = (ECDH_DATA *)data;

    }

#ifdef OPENSSL_FIPS

    if (FIPS_mode() && !(ecdh_data->flags & ECDH_FLAG_FIPS_METHOD)

        && !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) {

        ECDHerr(ECDH_F_ECDH_CHECK, ECDH_R_NON_FIPS_METHOD);

        return NULL;

    }

#endif

    return ecdh_data;

}

int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

{

    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,

                                   new_func, dup_func, free_func);

}

int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)

{

    ECDH_DATA *ecdh;

    ecdh = ecdh_check(d);

    if (ecdh == NULL)

        return 0;

    return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg));

}

void *ECDH_get_ex_data(EC_KEY *d, int idx)

{

    ECDH_DATA *ecdh;

    ecdh = ecdh_check(d);

    if (ecdh == NULL)

        return NULL;

    return (CRYPTO_get_ex_data(&ecdh->ex_data, idx));

}