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,
  70     ossl_ecdsa_sign_setup,
  71     ossl_ecdsa_sign_sig,
  72     ossl_ecdsa_verify,
  73     ossl_ecdsa_verify_sig
  74 };
  75
  76 static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
  77
  78 const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
  79 {
  80     return &openssl_ec_key_method;
  81 }
  82
  83 const EC_KEY_METHOD *EC_KEY_get_default_method(void)
  84 {
  85     return default_ec_key_meth;
  86 }
  87
  88 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
  89 {
  90     if (meth == NULL)
  91         default_ec_key_meth = &openssl_ec_key_method;
  92     else
  93         default_ec_key_meth = meth;
  94 }
  95
  96 EC_KEY *EC_KEY_new_method(ENGINE *engine)
  97 {
  98     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
  99
 100     if (ret == NULL) {
 101         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 102         return (NULL);
 103     }
 104     ret->meth = EC_KEY_get_default_method();
 105 #ifndef OPENSSL_NO_ENGINE
 106     if (engine != NULL) {
 107         if (!ENGINE_init(engine)) {
 108             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 109             OPENSSL_free(ret);
 110             return NULL;
 111         }
 112         ret->engine = engine;
 113     } else
 114         ret->engine = ENGINE_get_default_EC();
 115     if (ret->engine != NULL) {
 116         ret->meth = ENGINE_get_EC(ret->engine);
 117         if (ret->meth == NULL) {
 118             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 119             ENGINE_finish(ret->engine);
 120             OPENSSL_free(ret);
 121             return NULL;
 122         }
 123     }
 124 #endif
 125
 126     ret->version = 1;
 127     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 128     ret->references = 1;
 129     if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
 130         EC_KEY_free(ret);
 131         return NULL;
 132     }
 133     return ret;
 134 }
 135
 136 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 137                      const EC_KEY *eckey,
 138                      void *(*KDF) (const void *in, size_t inlen, void *out,
 139                                    size_t *outlen))
 140 {
 141     if (eckey->meth->compute_key != NULL)
 142         return eckey->meth->compute_key(out, outlen, pub_key, eckey, KDF);
 143     ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 144     return 0;
 145 }
 146
 147 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
 148 {
 149     EC_KEY_METHOD *ret;
 150     ret = OPENSSL_zalloc(sizeof(*meth));
 151     if (ret == NULL)
 152         return NULL;
 153     if (meth != NULL)
 154         *ret = *meth;
 155     ret->flags |= EC_KEY_METHOD_DYNAMIC;
 156     return ret;
 157 }
 158
 159 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
 160 {
 161     if (meth->flags & EC_KEY_METHOD_DYNAMIC)
 162         OPENSSL_free(meth);
 163 }
 164
 165 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
 166                             int (*init)(EC_KEY *key),
 167                             void (*finish)(EC_KEY *key),
 168                             int (*copy)(EC_KEY *dest, const EC_KEY *src),
 169                             int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
 170                             int (*set_private)(EC_KEY *key,
 171                                                const BIGNUM *priv_key),
 172                             int (*set_public)(EC_KEY *key,
 173                                               const EC_POINT *pub_key))
 174 {
 175     meth->init = init;
 176     meth->finish = finish;
 177     meth->copy = copy;
 178     meth->set_group = set_group;
 179     meth->set_private = set_private;
 180     meth->set_public = set_public;
 181 }
 182
 183 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
 184                               int (*keygen)(EC_KEY *key))
 185 {
 186     meth->keygen = keygen;
 187 }
 188
 189 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
 190                                    int (*ckey)(void *out,
 191                                                size_t outlen,
 192                                                const EC_POINT *pub_key,
 193                                                const EC_KEY *ecdh,
 194                                                void *(*KDF) (const void *in,
 195                                                              size_t inlen,
 196                                                              void *out,
 197                                                              size_t *outlen)))
 198 {
 199     meth->compute_key = ckey;
 200 }
 201
 202 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
 203                             int (*sign)(int type, const unsigned char *dgst,
 204                                         int dlen, unsigned char *sig,
 205                                         unsigned int *siglen,
 206                                         const BIGNUM *kinv, const BIGNUM *r,
 207                                         EC_KEY *eckey),
 208                             int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 209                                               BIGNUM **kinvp, BIGNUM **rp),
 210                             ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
 211                                                    int dgst_len,
 212                                                    const BIGNUM *in_kinv,
 213                                                    const BIGNUM *in_r,
 214                                                    EC_KEY *eckey))
 215 {
 216     meth->sign = sign;
 217     meth->sign_setup = sign_setup;
 218     meth->sign_sig = sign_sig;
 219 }
 220
 221 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
 222                               int (*verify)(int type, const unsigned
 223                                             char *dgst, int dgst_len,
 224                                             const unsigned char *sigbuf,
 225                                             int sig_len, EC_KEY *eckey),
 226                               int (*verify_sig)(const unsigned char *dgst,
 227                                                 int dgst_len,
 228                                                 const ECDSA_SIG *sig,
 229                                                 EC_KEY *eckey))
 230 {
 231     meth->verify = verify;
 232     meth->verify_sig = verify_sig;
 233 }
 234
 235 void EC_KEY_METHOD_get_init(EC_KEY_METHOD *meth,
 236                             int (**pinit)(EC_KEY *key),
 237                             void (**pfinish)(EC_KEY *key),
 238                             int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
 239                             int (**pset_group)(EC_KEY *key,
 240                                                const EC_GROUP *grp),
 241                             int (**pset_private)(EC_KEY *key,
 242                                                  const BIGNUM *priv_key),
 243                             int (**pset_public)(EC_KEY *key,
 244                                                 const EC_POINT *pub_key))
 245 {
 246     if (pinit != NULL)
 247         *pinit = meth->init;
 248     if (pfinish != NULL)
 249         *pfinish = meth->finish;
 250     if (pcopy != NULL)
 251         *pcopy = meth->copy;
 252     if (pset_group != NULL)
 253         *pset_group = meth->set_group;
 254     if (pset_private != NULL)
 255         *pset_private = meth->set_private;
 256     if (pset_public != NULL)
 257         *pset_public = meth->set_public;
 258 }
 259
 260 void EC_KEY_METHOD_get_keygen(EC_KEY_METHOD *meth,
 261                               int (**pkeygen)(EC_KEY *key))
 262 {
 263     if (pkeygen != NULL)
 264         *pkeygen = meth->keygen;
 265 }
 266
 267 void EC_KEY_METHOD_get_compute_key(EC_KEY_METHOD *meth,
 268                                    int (**pck)(void *out,
 269                                                size_t outlen,
 270                                                const EC_POINT *pub_key,
 271                                                const EC_KEY *ecdh,
 272                                                void *(*KDF) (const void *in,
 273                                                              size_t inlen,
 274                                                              void *out,
 275                                                              size_t *outlen)))
 276 {
 277     if (pck != NULL)
 278         *pck = meth->compute_key;
 279 }
 280
 281 void EC_KEY_METHOD_get_sign(EC_KEY_METHOD *meth,
 282                             int (**psign)(int type, const unsigned char *dgst,
 283                                           int dlen, unsigned char *sig,
 284                                           unsigned int *siglen,
 285                                           const BIGNUM *kinv, const BIGNUM *r,
 286                                           EC_KEY *eckey),
 287                             int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 288                                                 BIGNUM **kinvp, BIGNUM **rp),
 289                             ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
 290                                                      int dgst_len,
 291                                                      const BIGNUM *in_kinv,
 292                                                      const BIGNUM *in_r,
 293                                                      EC_KEY *eckey))
 294 {
 295     if (psign != NULL)
 296         *psign = meth->sign;
 297     if (psign_setup != NULL)
 298         *psign_setup = meth->sign_setup;
 299     if (psign_sig != NULL)
 300         *psign_sig = meth->sign_sig;
 301 }
 302
 303 void EC_KEY_METHOD_get_verify(EC_KEY_METHOD *meth,
 304                               int (**pverify)(int type, const unsigned
 305                                               char *dgst, int dgst_len,
 306                                               const unsigned char *sigbuf,
 307                                               int sig_len, EC_KEY *eckey),
 308                               int (**pverify_sig)(const unsigned char *dgst,
 309                                                   int dgst_len,
 310                                                   const ECDSA_SIG *sig,
 311                                                   EC_KEY *eckey))
 312 {
 313     if (pverify != NULL)
 314         *pverify = meth->verify;
 315     if (pverify_sig != NULL)
 316         *pverify_sig = meth->verify_sig;
 317 }