crypto/ec/ec_kmeth.c

   1 /* crypto/ec/ec_kmeth.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   4  * project.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  */
  54
  55 #include <openssl/ec.h>
  56 #ifndef OPENSSL_NO_ENGINE
  57 # include <openssl/engine.h>
  58 #endif
  59 #include <openssl/err.h>
  60 #include "ec_lcl.h"
  61
  62
  63 static const EC_KEY_METHOD openssl_ec_key_method = {
  64     "OpenSSL EC_KEY method",
  65     0,
  66     0,0,0,
  67     ossl_ec_key_gen,
  68     ossl_ecdh_compute_key
  69 };
  70
  71 const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
  72
  73 const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
  74 {
  75     return &openssl_ec_key_method;
  76 }
  77
  78 const EC_KEY_METHOD *EC_KEY_get_default_method(void)
  79 {
  80     return default_ec_key_meth;
  81 }
  82
  83 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
  84 {
  85     if (meth == NULL)
  86         default_ec_key_meth = &openssl_ec_key_method;
  87     else
  88         default_ec_key_meth = meth;
  89 }
  90
  91 EC_KEY *EC_KEY_new_method(ENGINE *engine)
  92 {
  93     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
  94
  95     if (ret == NULL) {
  96         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  97         return (NULL);
  98     }
  99     ret->meth = EC_KEY_get_default_method();
 100 #ifndef OPENSSL_NO_ENGINE
 101     if (engine) {
 102         if (!ENGINE_init(engine)) {
 103             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 104             OPENSSL_free(ret);
 105             return NULL;
 106         }
 107         ret->engine = engine;
 108     } else
 109         ret->engine = ENGINE_get_default_EC_KEY();
 110     if (ret->engine) {
 111         ret->meth = ENGINE_get_EC_KEY(ret->engine);
 112         if (!ret->meth) {
 113             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 114             ENGINE_finish(ret->engine);
 115             OPENSSL_free(ret);
 116             return NULL;
 117         }
 118     }
 119 #endif
 120
 121     ret->version = 1;
 122     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 123     ret->references = 1;
 124     if (ret->meth->init && ret->meth->init(ret) == 0) {
 125         EC_KEY_free(ret);
 126         return NULL;
 127     }
 128     return ret;
 129 }
 130
 131 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 132                      EC_KEY *eckey,
 133                      void *(*KDF) (const void *in, size_t inlen, void *out,
 134                                    size_t *outlen))
 135 {
 136     if (eckey->meth->compute_key)
 137         return eckey->meth->compute_key(out, outlen, pub_key, eckey, KDF);
 138     ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 139     return 0;
 140 }