crypto/engine/tb_dh.c

   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@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@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <openssl/evp.h>
  56 #include <openssl/engine.h>
  57 #include "eng_int.h"
  58
  59 /* If this symbol is defined then ENGINE_get_default_DH(), the function that is
  60  * used by DH to hook in implementation code and cache defaults (etc), will
  61  * display brief debugging summaries to stderr with the 'nid'. */
  62 /* #define ENGINE_DH_DEBUG */
  63
  64 static ENGINE_TABLE *dh_table = NULL;
  65 static const int dummy_nid = 1;
  66
  67 void ENGINE_unregister_DH(ENGINE *e)
  68         {
  69         engine_table_unregister(&dh_table, e);
  70         }
  71
  72 static void engine_unregister_all_DH()
  73         {
  74         engine_table_cleanup(&dh_table);
  75         }
  76
  77 int ENGINE_register_DH(ENGINE *e)
  78         {
  79         if(e->dh_meth)
  80                 return engine_table_register(&dh_table,
  81                                 &engine_unregister_all_DH, e, &dummy_nid, 1, 0);
  82         return 1;
  83         }
  84
  85 void ENGINE_register_all_DH()
  86         {
  87         ENGINE *e;
  88
  89         for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
  90                 ENGINE_register_DH(e);
  91         }
  92
  93 int ENGINE_set_default_DH(ENGINE *e)
  94         {
  95         if(e->dh_meth)
  96                 return engine_table_register(&dh_table,
  97                                 &engine_unregister_all_DH, e, &dummy_nid, 1, 1);
  98         return 1;
  99         }
 100
 101 /* Exposed API function to get a functional reference from the implementation
 102  * table (ie. try to get a functional reference from the tabled structural
 103  * references). */
 104 ENGINE *ENGINE_get_default_DH(void)
 105         {
 106         return engine_table_select(&dh_table, dummy_nid);
 107         }
 108
 109 /* Obtains an DH implementation from an ENGINE functional reference */
 110 const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
 111         {
 112         return e->dh_meth;
 113         }
 114
 115 /* Sets an DH implementation in an ENGINE structure */
 116 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
 117         {
 118         e->dh_meth = dh_meth;
 119         return 1;
 120         }