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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_default_DH(), the function that is
     58  * used by DH to hook in implementation code and cache defaults (etc), will
     59  * display brief debugging summaries to stderr with the 'nid'. */
     60 /* #define ENGINE_DH_DEBUG */
     61 
     62 static ENGINE_TABLE *dh_table = NULL;
     63 static const int dummy_nid = 1;
     64 
     65 void ENGINE_unregister_DH(ENGINE *e)
     66 	{
     67 	engine_table_unregister(&dh_table, e);
     68 	}
     69 
     70 static void engine_unregister_all_DH(void)
     71 	{
     72 	engine_table_cleanup(&dh_table);
     73 	}
     74 
     75 int ENGINE_register_DH(ENGINE *e)
     76 	{
     77 	if(e->dh_meth)
     78 		return engine_table_register(&dh_table,
     79 				engine_unregister_all_DH, e, &dummy_nid, 1, 0);
     80 	return 1;
     81 	}
     82 
     83 void ENGINE_register_all_DH()
     84 	{
     85 	ENGINE *e;
     86 
     87 	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
     88 		ENGINE_register_DH(e);
     89 	}
     90 
     91 int ENGINE_set_default_DH(ENGINE *e)
     92 	{
     93 	if(e->dh_meth)
     94 		return engine_table_register(&dh_table,
     95 				engine_unregister_all_DH, e, &dummy_nid, 1, 1);
     96 	return 1;
     97 	}
     98 
     99 /* Exposed API function to get a functional reference from the implementation
    100  * table (ie. try to get a functional reference from the tabled structural
    101  * references). */
    102 ENGINE *ENGINE_get_default_DH(void)
    103 	{
    104 	return engine_table_select(&dh_table, dummy_nid);
    105 	}
    106 
    107 /* Obtains an DH implementation from an ENGINE functional reference */
    108 const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
    109 	{
    110 	return e->dh_meth;
    111 	}
    112 
    113 /* Sets an DH implementation in an ENGINE structure */
    114 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
    115 	{
    116 	e->dh_meth = dh_meth;
    117 	return 1;
    118 	}
    119