/*

 * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/* We need to use some engine deprecated APIs */

#define OPENSSL_SUPPRESS_DEPRECATED

#include "eng_local.h"

static ENGINE_TABLE *digest_table = NULL;

void ENGINE_unregister_digests(ENGINE *e)

{

    engine_table_unregister(&digest_table, e);

}

static void engine_unregister_all_digests(void)

{

    engine_table_cleanup(&digest_table);

}

int ENGINE_register_digests(ENGINE *e)

{

    if (e->digests) {

        const int *nids;

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

        if (num_nids > 0)

            return engine_table_register(&digest_table,

                                         engine_unregister_all_digests, e,

                                         nids, num_nids, 0);

    }

    return 1;

}

void ENGINE_register_all_digests(void)

{

    ENGINE *e;

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

        ENGINE_register_digests(e);

}

int ENGINE_set_default_digests(ENGINE *e)

{

    if (e->digests) {

        const int *nids;

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

        if (num_nids > 0)

            return engine_table_register(&digest_table,

                                         engine_unregister_all_digests, 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 digest 'nid'

 */

ENGINE *ENGINE_get_digest_engine(int nid)

{

    return ossl_engine_table_select(&digest_table, nid,

                                    OPENSSL_FILE, OPENSSL_LINE);

}

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

const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid)

{

    const EVP_MD *ret;

    ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);

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

        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_UNIMPLEMENTED_DIGEST);

        return NULL;

    }

    return ret;

}

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

ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e)

{

    return e->digests;

}

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

int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)

{

    e->digests = f;

    return 1;

}