1/*
2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "internal/deprecated.h"
11
12#include <openssl/objects.h>
13#include <openssl/core_names.h>
14#include <openssl/evp.h>
15#include <openssl/core.h>
16#include "prov/securitycheck.h"
17#include "internal/nelem.h"
18
19/*
20 * Internal library code deals with NIDs, so we need to translate from a name.
21 * We do so using EVP_MD_is_a(), and therefore need a name to NID map.
22 */
23int ossl_digest_md_to_nid(const EVP_MD *md, const OSSL_ITEM *it, size_t it_len)
24{
25    size_t i;
26
27    if (md == NULL)
28        return NID_undef;
29
30    for (i = 0; i < it_len; i++)
31        if (EVP_MD_is_a(md, it[i].ptr))
32            return (int)it[i].id;
33    return NID_undef;
34}
35
36/*
37 * Retrieve one of the FIPS approved hash algorithms by nid.
38 * See FIPS 180-4 "Secure Hash Standard" and FIPS 202 - SHA-3.
39 */
40int ossl_digest_get_approved_nid(const EVP_MD *md)
41{
42    static const OSSL_ITEM name_to_nid[] = {
43        { NID_sha1,      OSSL_DIGEST_NAME_SHA1      },
44        { NID_sha224,    OSSL_DIGEST_NAME_SHA2_224  },
45        { NID_sha256,    OSSL_DIGEST_NAME_SHA2_256  },
46        { NID_sha384,    OSSL_DIGEST_NAME_SHA2_384  },
47        { NID_sha512,    OSSL_DIGEST_NAME_SHA2_512  },
48        { NID_sha512_224, OSSL_DIGEST_NAME_SHA2_512_224 },
49        { NID_sha512_256, OSSL_DIGEST_NAME_SHA2_512_256 },
50        { NID_sha3_224,  OSSL_DIGEST_NAME_SHA3_224  },
51        { NID_sha3_256,  OSSL_DIGEST_NAME_SHA3_256  },
52        { NID_sha3_384,  OSSL_DIGEST_NAME_SHA3_384  },
53        { NID_sha3_512,  OSSL_DIGEST_NAME_SHA3_512  },
54    };
55
56    return ossl_digest_md_to_nid(md, name_to_nid, OSSL_NELEM(name_to_nid));
57}
58