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