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     ECDH_DATA *ecdh;
 100
 101     ecdh = ecdh_check(eckey);
 102
 103     if (ecdh == NULL)
 104         return 0;
 105
 106 #if 0
 107     mtmp = ecdh->meth;
 108     if (mtmp->finish)
 109         mtmp->finish(eckey);
 110 #endif
 111 #ifndef OPENSSL_NO_ENGINE
 112     if (ecdh->engine) {
 113         ENGINE_finish(ecdh->engine);
 114         ecdh->engine = NULL;
 115     }
 116 #endif
 117     ecdh->meth = meth;
 118 #if 0
 119     if (meth->init)
 120         meth->init(eckey);
 121 #endif
 122     return 1;
 123 }
 124
 125 static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
 126 {
 127     ECDH_DATA *ret;
 128
 129     ret = (ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
 130     if (ret == NULL) {
 131         ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 132         return (NULL);
 133     }
 134
 135     ret->init = NULL;
 136
 137     ret->meth = ECDH_get_default_method();
 138     ret->engine = engine;
 139 #ifndef OPENSSL_NO_ENGINE
 140     if (!ret->engine)
 141         ret->engine = ENGINE_get_default_ECDH();
 142     if (ret->engine) {
 143         ret->meth = ENGINE_get_ECDH(ret->engine);
 144         if (!ret->meth) {
 145             ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
 146             ENGINE_finish(ret->engine);
 147             OPENSSL_free(ret);
 148             return NULL;
 149         }
 150     }
 151 #endif
 152
 153     ret->flags = ret->meth->flags;
 154     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
 155 #if 0
 156     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 157         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
 158         OPENSSL_free(ret);
 159         ret = NULL;
 160     }
 161 #endif
 162     return (ret);
 163 }
 164
 165 static void *ecdh_data_new(void)
 166 {
 167     return (void *)ECDH_DATA_new_method(NULL);
 168 }
 169
 170 static void *ecdh_data_dup(void *data)
 171 {
 172     ECDH_DATA *r = (ECDH_DATA *)data;
 173
 174     /* XXX: dummy operation */
 175     if (r == NULL)
 176         return NULL;
 177
 178     return (void *)ecdh_data_new();
 179 }
 180
 181 void ecdh_data_free(void *data)
 182 {
 183     ECDH_DATA *r = (ECDH_DATA *)data;
 184
 185 #ifndef OPENSSL_NO_ENGINE
 186     if (r->engine)
 187         ENGINE_finish(r->engine);
 188 #endif
 189
 190     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
 191
 192     OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
 193
 194     OPENSSL_free(r);
 195 }
 196
 197 ECDH_DATA *ecdh_check(EC_KEY *key)
 198 {
 199     ECDH_DATA *ecdh_data;
 200
 201     void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
 202                                             ecdh_data_free, ecdh_data_free);
 203     if (data == NULL) {
 204         ecdh_data = (ECDH_DATA *)ecdh_data_new();
 205         if (ecdh_data == NULL)
 206             return NULL;
 207         data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
 208                                              ecdh_data_dup, ecdh_data_free,
 209                                              ecdh_data_free);
 210         if (data != NULL) {
 211             /*
 212              * Another thread raced us to install the key_method data and
 213              * won.
 214              */
 215             ecdh_data_free(ecdh_data);
 216             ecdh_data = (ECDH_DATA *)data;
 217         }
 218     } else
 219         ecdh_data = (ECDH_DATA *)data;
 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 }