/*

 * Copyright 2020-2021 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

 */

#include <string.h> /* strcmp */

#include <openssl/dh.h>

#include "internal/nelem.h"

#include "crypto/dh.h"

typedef struct dh_name2id_st{

    const char *name;

    int id;

    int type;

} DH_GENTYPE_NAME2ID;

/* Indicates that the paramgen_type can be used for either DH or DHX */

#define TYPE_ANY -1

#ifndef OPENSSL_NO_DH

# define TYPE_DH    DH_FLAG_TYPE_DH

# define TYPE_DHX   DH_FLAG_TYPE_DHX

#else

# define TYPE_DH    0

# define TYPE_DHX   0

#endif

static const DH_GENTYPE_NAME2ID dhtype2id[] =

{

    { "group", DH_PARAMGEN_TYPE_GROUP, TYPE_ANY },

    { "generator", DH_PARAMGEN_TYPE_GENERATOR, TYPE_DH },

    { "fips186_4", DH_PARAMGEN_TYPE_FIPS_186_4, TYPE_DHX },

    { "fips186_2", DH_PARAMGEN_TYPE_FIPS_186_2, TYPE_DHX },

};

const char *ossl_dh_gen_type_id2name(int id)

{

    size_t i;

    for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {

        if (dhtype2id[i].id == id)

            return dhtype2id[i].name;

    }

    return NULL;

}

#ifndef OPENSSL_NO_DH

int ossl_dh_gen_type_name2id(const char *name, int type)

{

    size_t i;

    for (i = 0; i < OSSL_NELEM(dhtype2id); ++i) {

        if ((dhtype2id[i].type == TYPE_ANY

             || type == dhtype2id[i].type)

            && strcmp(dhtype2id[i].name, name) == 0)

            return dhtype2id[i].id;

    }

    return -1;

}

#endif