/*

 * 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 "internal/deprecated.h"

#include <openssl/objects.h>

#include <openssl/core_names.h>

#include <openssl/evp.h>

#include <openssl/core.h>

#include "prov/securitycheck.h"

#include "internal/nelem.h"

/*

 * Internal library code deals with NIDs, so we need to translate from a name.

 * We do so using EVP_MD_is_a(), and therefore need a name to NID map.

 */

int ossl_digest_md_to_nid(const EVP_MD *md, const OSSL_ITEM *it, size_t it_len)

{

    size_t i;

    if (md == NULL)

        return NID_undef;

    for (i = 0; i < it_len; i++)

        if (EVP_MD_is_a(md, it[i].ptr))

            return (int)it[i].id;

    return NID_undef;

}

/*

 * Retrieve one of the FIPS approved hash algorithms by nid.

 * See FIPS 180-4 "Secure Hash Standard" and FIPS 202 - SHA-3.

 */

int ossl_digest_get_approved_nid(const EVP_MD *md)

{

    static const OSSL_ITEM name_to_nid[] = {

        { NID_sha1,      OSSL_DIGEST_NAME_SHA1      },

        { NID_sha224,    OSSL_DIGEST_NAME_SHA2_224  },

        { NID_sha256,    OSSL_DIGEST_NAME_SHA2_256  },

        { NID_sha384,    OSSL_DIGEST_NAME_SHA2_384  },

        { NID_sha512,    OSSL_DIGEST_NAME_SHA2_512  },

        { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },

        { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },

        { NID_sha3_224,  OSSL_DIGEST_NAME_SHA3_224  },

        { NID_sha3_256,  OSSL_DIGEST_NAME_SHA3_256  },

        { NID_sha3_384,  OSSL_DIGEST_NAME_SHA3_384  },

        { NID_sha3_512,  OSSL_DIGEST_NAME_SHA3_512  },

    };

    return ossl_digest_md_to_nid(md, name_to_nid, OSSL_NELEM(name_to_nid));

}