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     0,0,0,0,0,0,
  67     ossl_ec_key_gen,
  68     ossl_ecdh_compute_key,
  69     ossl_ecdsa_sign_setup,
  70     ossl_ecdsa_sign_sig,
  71     ossl_ecdsa_verify_sig
  72 };
  73
  74 const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
  75
  76 const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
  77 {
  78     return &openssl_ec_key_method;
  79 }
  80
  81 const EC_KEY_METHOD *EC_KEY_get_default_method(void)
  82 {
  83     return default_ec_key_meth;
  84 }
  85
  86 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
  87 {
  88     if (meth == NULL)
  89         default_ec_key_meth = &openssl_ec_key_method;
  90     else
  91         default_ec_key_meth = meth;
  92 }
  93
  94 EC_KEY *EC_KEY_new_method(ENGINE *engine)
  95 {
  96     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
  97
  98     if (ret == NULL) {
  99         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 100         return (NULL);
 101     }
 102     ret->meth = EC_KEY_get_default_method();
 103 #ifndef OPENSSL_NO_ENGINE
 104     if (engine) {
 105         if (!ENGINE_init(engine)) {
 106             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 107             OPENSSL_free(ret);
 108             return NULL;
 109         }
 110         ret->engine = engine;
 111     } else
 112         ret->engine = ENGINE_get_default_EC();
 113     if (ret->engine) {
 114         ret->meth = ENGINE_get_EC(ret->engine);
 115         if (!ret->meth) {
 116             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 117             ENGINE_finish(ret->engine);
 118             OPENSSL_free(ret);
 119             return NULL;
 120         }
 121     }
 122 #endif
 123
 124     ret->version = 1;
 125     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 126     ret->references = 1;
 127     if (ret->meth->init && ret->meth->init(ret) == 0) {
 128         EC_KEY_free(ret);
 129         return NULL;
 130     }
 131     return ret;
 132 }
 133
 134 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 135                      EC_KEY *eckey,
 136                      void *(*KDF) (const void *in, size_t inlen, void *out,
 137                                    size_t *outlen))
 138 {
 139     if (eckey->meth->compute_key)
 140         return eckey->meth->compute_key(out, outlen, pub_key, eckey, KDF);
 141     ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 142     return 0;
 143 }