crypto/libressl/crypto/engine/tb_digest.c

   1 /* $OpenBSD: tb_digest.c,v 1.6 2014/06/12 15:49:29 deraadt Exp $ */
   2 /* ====================================================================
   3  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    licensing@OpenSSL.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 #include <openssl/err.h>
  57
  58 #include "eng_int.h"
  59
  60 /* If this symbol is defined then ENGINE_get_digest_engine(), the function that
  61  * is used by EVP to hook in digest code and cache defaults (etc), will display
  62  * brief debugging summaries to stderr with the 'nid'. */
  63 /* #define ENGINE_DIGEST_DEBUG */
  64
  65 static ENGINE_TABLE *digest_table = NULL;
  66
  67 void
  68 ENGINE_unregister_digests(ENGINE *e)
  69 {
  70         engine_table_unregister(&digest_table, e);
  71 }
  72
  73 static void
  74 engine_unregister_all_digests(void)
  75 {
  76         engine_table_cleanup(&digest_table);
  77 }
  78
  79 int
  80 ENGINE_register_digests(ENGINE *e)
  81 {
  82         if (e->digests) {
  83                 const int *nids;
  84                 int num_nids = e->digests(e, NULL, &nids, 0);
  85                 if (num_nids > 0)
  86                         return engine_table_register(&digest_table,
  87                             engine_unregister_all_digests, e, nids,
  88                             num_nids, 0);
  89         }
  90         return 1;
  91 }
  92
  93 void
  94 ENGINE_register_all_digests(void)
  95 {
  96         ENGINE *e;
  97
  98         for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
  99                 ENGINE_register_digests(e);
 100 }
 101
 102 int
 103 ENGINE_set_default_digests(ENGINE *e)
 104 {
 105         if (e->digests) {
 106                 const int *nids;
 107                 int num_nids = e->digests(e, NULL, &nids, 0);
 108                 if (num_nids > 0)
 109                         return engine_table_register(&digest_table,
 110                             engine_unregister_all_digests, e, nids,
 111                             num_nids, 1);
 112         }
 113         return 1;
 114 }
 115
 116 /* Exposed API function to get a functional reference from the implementation
 117  * table (ie. try to get a functional reference from the tabled structural
 118  * references) for a given digest 'nid' */
 119 ENGINE *
 120 ENGINE_get_digest_engine(int nid)
 121 {
 122         return engine_table_select(&digest_table, nid);
 123 }
 124
 125 /* Obtains a digest implementation from an ENGINE functional reference */
 126 const EVP_MD *
 127 ENGINE_get_digest(ENGINE *e, int nid)
 128 {
 129         const EVP_MD *ret;
 130         ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
 131
 132         if (!fn || !fn(e, &ret, NULL, nid)) {
 133                 ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST,
 134                     ENGINE_R_UNIMPLEMENTED_DIGEST);
 135                 return NULL;
 136         }
 137         return ret;
 138 }
 139
 140 /* Gets the digest callback from an ENGINE structure */
 141 ENGINE_DIGESTS_PTR
 142 ENGINE_get_digests(const ENGINE *e)
 143 {
 144         return e->digests;
 145 }
 146
 147 /* Sets the digest callback in an ENGINE structure */
 148 int
 149 ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
 150 {
 151         e->digests = f;
 152         return 1;
 153 }