crypto/ecdh/ech_lib.c

   1 /* crypto/ecdh/ech_lib.c */
   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 software is originally written by Douglas Stebila of
  13  * Sun Microsystems Laboratories.
  14  *
  15  */
  16 /* ====================================================================
  17  * Copyright (c) 1998-2003 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  *    openssl-core@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 "ech_locl.h"
  71 #include <string.h>
  72 #ifndef OPENSSL_NO_ENGINE
  73 #include <openssl/engine.h>
  74 #endif
  75 #include <openssl/err.h>
  76
  77 const char ECDH_version[]="ECDH" OPENSSL_VERSION_PTEXT;
  78
  79 static const ECDH_METHOD *default_ECDH_method = NULL;
  80
  81 static void *ecdh_data_new(void);
  82 static void *ecdh_data_dup(void *);
  83 static void  ecdh_data_free(void *);
  84
  85 void ECDH_set_default_method(const ECDH_METHOD *meth)
  86         {
  87         default_ECDH_method = meth;
  88         }
  89
  90 const ECDH_METHOD *ECDH_get_default_method(void)
  91         {
  92         if(!default_ECDH_method)
  93                 default_ECDH_method = ECDH_OpenSSL();
  94         return default_ECDH_method;
  95         }
  96
  97 int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
  98         {
  99         const ECDH_METHOD *mtmp;
 100         ECDH_DATA *ecdh;
 101
 102         ecdh = ecdh_check(eckey);
 103
 104         if (ecdh == NULL)
 105                 return 0;
 106
 107         mtmp = ecdh->meth;
 108 #if 0
 109         if (mtmp->finish)
 110                 mtmp->finish(eckey);
 111 #endif
 112 #ifndef OPENSSL_NO_ENGINE
 113         if (ecdh->engine)
 114                 {
 115                 ENGINE_finish(ecdh->engine);
 116                 ecdh->engine = NULL;
 117                 }
 118 #endif
 119         ecdh->meth = meth;
 120 #if 0
 121         if (meth->init)
 122                 meth->init(eckey);
 123 #endif
 124         return 1;
 125         }
 126
 127 static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
 128         {
 129         ECDH_DATA *ret;
 130
 131         ret=(ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
 132         if (ret == NULL)
 133                 {
 134                 ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 135                 return(NULL);
 136                 }
 137
 138         ret->init = NULL;
 139
 140         ret->meth = ECDH_get_default_method();
 141         ret->engine = engine;
 142 #ifndef OPENSSL_NO_ENGINE
 143         if (!ret->engine)
 144                 ret->engine = ENGINE_get_default_ECDH();
 145         if (ret->engine)
 146                 {
 147                 ret->meth = ENGINE_get_ECDH(ret->engine);
 148                 if (!ret->meth)
 149                         {
 150                         ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
 151                         ENGINE_finish(ret->engine);
 152                         OPENSSL_free(ret);
 153                         return NULL;
 154                         }
 155                 }
 156 #endif
 157
 158         ret->flags = ret->meth->flags;
 159         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
 160 #if 0
 161         if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 162                 {
 163                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
 164                 OPENSSL_free(ret);
 165                 ret=NULL;
 166                 }
 167 #endif
 168         return(ret);
 169         }
 170
 171 static void *ecdh_data_new(void)
 172         {
 173         return (void *)ECDH_DATA_new_method(NULL);
 174         }
 175
 176 static void *ecdh_data_dup(void *data)
 177 {
 178         ECDH_DATA *r = (ECDH_DATA *)data;
 179
 180         /* XXX: dummy operation */
 181         if (r == NULL)
 182                 return NULL;
 183
 184         return (void *)ecdh_data_new();
 185 }
 186
 187 void ecdh_data_free(void *data)
 188         {
 189         ECDH_DATA *r = (ECDH_DATA *)data;
 190
 191 #ifndef OPENSSL_NO_ENGINE
 192         if (r->engine)
 193                 ENGINE_finish(r->engine);
 194 #endif
 195
 196         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
 197
 198         OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
 199
 200         OPENSSL_free(r);
 201         }
 202
 203 ECDH_DATA *ecdh_check(EC_KEY *key)
 204         {
 205         ECDH_DATA *ecdh_data;
 206
 207         void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
 208                                         ecdh_data_free, ecdh_data_free);
 209         if (data == NULL)
 210         {
 211                 ecdh_data = (ECDH_DATA *)ecdh_data_new();
 212                 if (ecdh_data == NULL)
 213                         return NULL;
 214                 EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
 215                         ecdh_data_dup, ecdh_data_free, ecdh_data_free);
 216         }
 217         else
 218                 ecdh_data = (ECDH_DATA *)data;
 219
 220
 221         return ecdh_data;
 222         }
 223
 224 int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 225              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 226         {
 227         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
 228                                 new_func, dup_func, free_func);
 229         }
 230
 231 int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
 232         {
 233         ECDH_DATA *ecdh;
 234         ecdh = ecdh_check(d);
 235         if (ecdh == NULL)
 236                 return 0;
 237         return(CRYPTO_set_ex_data(&ecdh->ex_data,idx,arg));
 238         }
 239
 240 void *ECDH_get_ex_data(EC_KEY *d, int idx)
 241         {
 242         ECDH_DATA *ecdh;
 243         ecdh = ecdh_check(d);
 244         if (ecdh == NULL)
 245                 return NULL;
 246         return(CRYPTO_get_ex_data(&ecdh->ex_data,idx));
 247         }