/*

 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "eng_local.h"

#include <openssl/evp.h>

static ENGINE_TABLE *pkey_meth_table = NULL;

void ENGINE_unregister_pkey_meths(ENGINE *e)

{

    engine_table_unregister(&pkey_meth_table, e);

}

static void engine_unregister_all_pkey_meths(void)

{

    engine_table_cleanup(&pkey_meth_table);

}

int ENGINE_register_pkey_meths(ENGINE *e)

{

    if (e->pkey_meths) {

        const int *nids;

        int num_nids = e->pkey_meths(e, NULL, &nids, 0);

        if (num_nids > 0)

            return engine_table_register(&pkey_meth_table,

                                         engine_unregister_all_pkey_meths, e,

                                         nids, num_nids, 0);

    }

    return 1;

}

void ENGINE_register_all_pkey_meths(void)

{

    ENGINE *e;

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

        ENGINE_register_pkey_meths(e);

}

int ENGINE_set_default_pkey_meths(ENGINE *e)

{

    if (e->pkey_meths) {

        const int *nids;

        int num_nids = e->pkey_meths(e, NULL, &nids, 0);

        if (num_nids > 0)

            return engine_table_register(&pkey_meth_table,

                                         engine_unregister_all_pkey_meths, e,

                                         nids, num_nids, 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) for a given pkey_meth 'nid'

 */

ENGINE *ENGINE_get_pkey_meth_engine(int nid)

{

    return engine_table_select(&pkey_meth_table, nid);

}

/* Obtains a pkey_meth implementation from an ENGINE functional reference */

const EVP_PKEY_METHOD *ENGINE_get_pkey_meth(ENGINE *e, int nid)

{

    EVP_PKEY_METHOD *ret;

    ENGINE_PKEY_METHS_PTR fn = ENGINE_get_pkey_meths(e);

    if (!fn || !fn(e, &ret, NULL, nid)) {

        ENGINEerr(ENGINE_F_ENGINE_GET_PKEY_METH,

                  ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);

        return NULL;

    }

    return ret;

}

/* Gets the pkey_meth callback from an ENGINE structure */

ENGINE_PKEY_METHS_PTR ENGINE_get_pkey_meths(const ENGINE *e)

{

    return e->pkey_meths;

}

/* Sets the pkey_meth callback in an ENGINE structure */

int ENGINE_set_pkey_meths(ENGINE *e, ENGINE_PKEY_METHS_PTR f)

{

    e->pkey_meths = f;

    return 1;

}

/*

 * Internal function to free up EVP_PKEY_METHOD structures before an ENGINE

 * is destroyed

 */

void engine_pkey_meths_free(ENGINE *e)

{

    int i;

    EVP_PKEY_METHOD *pkm;

    if (e->pkey_meths) {

        const int *pknids;

        int npknids;

        npknids = e->pkey_meths(e, NULL, &pknids, 0);

        for (i = 0; i < npknids; i++) {

            if (e->pkey_meths(e, &pkm, NULL, pknids[i])) {

                EVP_PKEY_meth_free(pkm);

            }

        }

    }

}