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 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
  97 {
  98     return key->meth;
  99 }
 100
 101 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
 102 {
 103     void (*finish)(EC_KEY *key) = key->meth->finish;
 104
 105     if (finish != NULL)
 106         finish(key);
 107
 108 #ifndef OPENSSL_NO_ENGINE
 109     if (key->engine != NULL) {
 110         ENGINE_finish(key->engine);
 111         key->engine = NULL;
 112     }
 113 #endif
 114
 115     key->meth = meth;
 116     if (meth->init != NULL)
 117         return meth->init(key);
 118     return 1;
 119 }
 120
 121 EC_KEY *EC_KEY_new_method(ENGINE *engine)
 122 {
 123     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
 124
 125     if (ret == NULL) {
 126         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 127         return (NULL);
 128     }
 129     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
 130         OPENSSL_free(ret);
 131         return NULL;
 132     }
 133
 134     ret->meth = EC_KEY_get_default_method();
 135 #ifndef OPENSSL_NO_ENGINE
 136     if (engine != NULL) {
 137         if (!ENGINE_init(engine)) {
 138             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 139             OPENSSL_free(ret);
 140             return NULL;
 141         }
 142         ret->engine = engine;
 143     } else
 144         ret->engine = ENGINE_get_default_EC();
 145     if (ret->engine != NULL) {
 146         ret->meth = ENGINE_get_EC(ret->engine);
 147         if (ret->meth == NULL) {
 148             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 149             ENGINE_finish(ret->engine);
 150             OPENSSL_free(ret);
 151             return NULL;
 152         }
 153     }
 154 #endif
 155
 156     ret->version = 1;
 157     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 158     ret->references = 1;
 159     if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
 160         EC_KEY_free(ret);
 161         return NULL;
 162     }
 163     return ret;
 164 }
 165
 166 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 167                      const EC_KEY *eckey,
 168                      void *(*KDF) (const void *in, size_t inlen, void *out,
 169                                    size_t *outlen))
 170 {
 171     if (eckey->meth->compute_key != NULL)
 172         return eckey->meth->compute_key(out, outlen, pub_key, eckey, KDF);
 173     ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 174     return 0;
 175 }
 176
 177 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
 178 {
 179     EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
 180
 181     if (ret == NULL)
 182         return NULL;
 183     if (meth != NULL)
 184         *ret = *meth;
 185     ret->flags |= EC_KEY_METHOD_DYNAMIC;
 186     return ret;
 187 }
 188
 189 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
 190 {
 191     if (meth->flags & EC_KEY_METHOD_DYNAMIC)
 192         OPENSSL_free(meth);
 193 }
 194
 195 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
 196                             int (*init)(EC_KEY *key),
 197                             void (*finish)(EC_KEY *key),
 198                             int (*copy)(EC_KEY *dest, const EC_KEY *src),
 199                             int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
 200                             int (*set_private)(EC_KEY *key,
 201                                                const BIGNUM *priv_key),
 202                             int (*set_public)(EC_KEY *key,
 203                                               const EC_POINT *pub_key))
 204 {
 205     meth->init = init;
 206     meth->finish = finish;
 207     meth->copy = copy;
 208     meth->set_group = set_group;
 209     meth->set_private = set_private;
 210     meth->set_public = set_public;
 211 }
 212
 213 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
 214                               int (*keygen)(EC_KEY *key))
 215 {
 216     meth->keygen = keygen;
 217 }
 218
 219 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
 220                                    int (*ckey)(void *out,
 221                                                size_t outlen,
 222                                                const EC_POINT *pub_key,
 223                                                const EC_KEY *ecdh,
 224                                                void *(*KDF) (const void *in,
 225                                                              size_t inlen,
 226                                                              void *out,
 227                                                              size_t *outlen)))
 228 {
 229     meth->compute_key = ckey;
 230 }
 231
 232 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
 233                             int (*sign)(int type, const unsigned char *dgst,
 234                                         int dlen, unsigned char *sig,
 235                                         unsigned int *siglen,
 236                                         const BIGNUM *kinv, const BIGNUM *r,
 237                                         EC_KEY *eckey),
 238                             int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 239                                               BIGNUM **kinvp, BIGNUM **rp),
 240                             ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
 241                                                    int dgst_len,
 242                                                    const BIGNUM *in_kinv,
 243                                                    const BIGNUM *in_r,
 244                                                    EC_KEY *eckey))
 245 {
 246     meth->sign = sign;
 247     meth->sign_setup = sign_setup;
 248     meth->sign_sig = sign_sig;
 249 }
 250
 251 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
 252                               int (*verify)(int type, const unsigned
 253                                             char *dgst, int dgst_len,
 254                                             const unsigned char *sigbuf,
 255                                             int sig_len, EC_KEY *eckey),
 256                               int (*verify_sig)(const unsigned char *dgst,
 257                                                 int dgst_len,
 258                                                 const ECDSA_SIG *sig,
 259                                                 EC_KEY *eckey))
 260 {
 261     meth->verify = verify;
 262     meth->verify_sig = verify_sig;
 263 }
 264
 265 void EC_KEY_METHOD_get_init(EC_KEY_METHOD *meth,
 266                             int (**pinit)(EC_KEY *key),
 267                             void (**pfinish)(EC_KEY *key),
 268                             int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
 269                             int (**pset_group)(EC_KEY *key,
 270                                                const EC_GROUP *grp),
 271                             int (**pset_private)(EC_KEY *key,
 272                                                  const BIGNUM *priv_key),
 273                             int (**pset_public)(EC_KEY *key,
 274                                                 const EC_POINT *pub_key))
 275 {
 276     if (pinit != NULL)
 277         *pinit = meth->init;
 278     if (pfinish != NULL)
 279         *pfinish = meth->finish;
 280     if (pcopy != NULL)
 281         *pcopy = meth->copy;
 282     if (pset_group != NULL)
 283         *pset_group = meth->set_group;
 284     if (pset_private != NULL)
 285         *pset_private = meth->set_private;
 286     if (pset_public != NULL)
 287         *pset_public = meth->set_public;
 288 }
 289
 290 void EC_KEY_METHOD_get_keygen(EC_KEY_METHOD *meth,
 291                               int (**pkeygen)(EC_KEY *key))
 292 {
 293     if (pkeygen != NULL)
 294         *pkeygen = meth->keygen;
 295 }
 296
 297 void EC_KEY_METHOD_get_compute_key(EC_KEY_METHOD *meth,
 298                                    int (**pck)(void *out,
 299                                                size_t outlen,
 300                                                const EC_POINT *pub_key,
 301                                                const EC_KEY *ecdh,
 302                                                void *(*KDF) (const void *in,
 303                                                              size_t inlen,
 304                                                              void *out,
 305                                                              size_t *outlen)))
 306 {
 307     if (pck != NULL)
 308         *pck = meth->compute_key;
 309 }
 310
 311 void EC_KEY_METHOD_get_sign(EC_KEY_METHOD *meth,
 312                             int (**psign)(int type, const unsigned char *dgst,
 313                                           int dlen, unsigned char *sig,
 314                                           unsigned int *siglen,
 315                                           const BIGNUM *kinv, const BIGNUM *r,
 316                                           EC_KEY *eckey),
 317                             int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 318                                                 BIGNUM **kinvp, BIGNUM **rp),
 319                             ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
 320                                                      int dgst_len,
 321                                                      const BIGNUM *in_kinv,
 322                                                      const BIGNUM *in_r,
 323                                                      EC_KEY *eckey))
 324 {
 325     if (psign != NULL)
 326         *psign = meth->sign;
 327     if (psign_setup != NULL)
 328         *psign_setup = meth->sign_setup;
 329     if (psign_sig != NULL)
 330         *psign_sig = meth->sign_sig;
 331 }
 332
 333 void EC_KEY_METHOD_get_verify(EC_KEY_METHOD *meth,
 334                               int (**pverify)(int type, const unsigned
 335                                               char *dgst, int dgst_len,
 336                                               const unsigned char *sigbuf,
 337                                               int sig_len, EC_KEY *eckey),
 338                               int (**pverify_sig)(const unsigned char *dgst,
 339                                                   int dgst_len,
 340                                                   const ECDSA_SIG *sig,
 341                                                   EC_KEY *eckey))
 342 {
 343     if (pverify != NULL)
 344         *pverify = meth->verify;
 345     if (pverify_sig != NULL)
 346         *pverify_sig = meth->verify_sig;
 347 }