lib/libcrypto/engine/tb_ecdh.c

   1 /* $OpenBSD: tb_ecdh.c,v 1.4 2014/06/12 15:49:29 deraadt Exp $ */
   2 /* ====================================================================
   3  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
   4  *
   5  * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
   6  * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
   7  * to the OpenSSL project.
   8  *
   9  * The ECC Code is licensed pursuant to the OpenSSL open source
  10  * license provided below.
  11  *
  12  * The ECDH engine software is originally written by Nils Gura and
  13  * Douglas Stebila of Sun Microsystems Laboratories.
  14  *
  15  */
  16 /* ====================================================================
  17  * Copyright (c) 2000-2002 The OpenSSL Project.  All rights reserved.
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  *
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  *
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *
  31  * 3. All advertising materials mentioning features or use of this
  32  *    software must display the following acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  35  *
  36  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  37  *    endorse or promote products derived from this software without
  38  *    prior written permission. For written permission, please contact
  39  *    licensing@OpenSSL.org.
  40  *
  41  * 5. Products derived from this software may not be called "OpenSSL"
  42  *    nor may "OpenSSL" appear in their names without prior written
  43  *    permission of the OpenSSL Project.
  44  *
  45  * 6. Redistributions of any form whatsoever must retain the following
  46  *    acknowledgment:
  47  *    "This product includes software developed by the OpenSSL Project
  48  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  51  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  53  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  54  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  56  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  57  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  59  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  60  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  61  * OF THE POSSIBILITY OF SUCH DAMAGE.
  62  * ====================================================================
  63  *
  64  * This product includes cryptographic software written by Eric Young
  65  * (eay@cryptsoft.com).  This product includes software written by Tim
  66  * Hudson (tjh@cryptsoft.com).
  67  *
  68  */
  69
  70 #include "eng_int.h"
  71
  72 /* If this symbol is defined then ENGINE_get_default_ECDH(), the function that is
  73  * used by ECDH to hook in implementation code and cache defaults (etc), will
  74  * display brief debugging summaries to stderr with the 'nid'. */
  75 /* #define ENGINE_ECDH_DEBUG */
  76
  77 static ENGINE_TABLE *ecdh_table = NULL;
  78 static const int dummy_nid = 1;
  79
  80 void
  81 ENGINE_unregister_ECDH(ENGINE *e)
  82 {
  83         engine_table_unregister(&ecdh_table, e);
  84 }
  85
  86 static void
  87 engine_unregister_all_ECDH(void)
  88 {
  89         engine_table_cleanup(&ecdh_table);
  90 }
  91
  92 int
  93 ENGINE_register_ECDH(ENGINE *e)
  94 {
  95         if (e->ecdh_meth)
  96                 return engine_table_register(&ecdh_table,
  97                     engine_unregister_all_ECDH, e, &dummy_nid, 1, 0);
  98         return 1;
  99 }
 100
 101 void
 102 ENGINE_register_all_ECDH(void)
 103 {
 104         ENGINE *e;
 105
 106         for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
 107                 ENGINE_register_ECDH(e);
 108 }
 109
 110 int
 111 ENGINE_set_default_ECDH(ENGINE *e)
 112 {
 113         if (e->ecdh_meth)
 114                 return engine_table_register(&ecdh_table,
 115                     engine_unregister_all_ECDH, e, &dummy_nid, 1, 1);
 116         return 1;
 117 }
 118
 119 /* Exposed API function to get a functional reference from the implementation
 120  * table (ie. try to get a functional reference from the tabled structural
 121  * references). */
 122 ENGINE *
 123 ENGINE_get_default_ECDH(void)
 124 {
 125         return engine_table_select(&ecdh_table, dummy_nid);
 126 }
 127
 128 /* Obtains an ECDH implementation from an ENGINE functional reference */
 129 const ECDH_METHOD *
 130 ENGINE_get_ECDH(const ENGINE *e)
 131 {
 132         return e->ecdh_meth;
 133 }
 134
 135 /* Sets an ECDH implementation in an ENGINE structure */
 136 int
 137 ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth)
 138 {
 139         e->ecdh_meth = ecdh_meth;
 140         return 1;
 141 }