providers/common/digest_to_nid.c

   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  */
  23 int 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  */
  40 int 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 }