crypto/ec/ec_key.c

   1 /* crypto/ec/ec_key.c */
   2 /*
   3  * Written by Nils Larsch for the OpenSSL project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58 /* ====================================================================
  59  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  60  * Portions originally developed by SUN MICROSYSTEMS, INC., and
  61  * contributed to the OpenSSL project.
  62  */
  63
  64 #define OPENSSL_FIPSAPI
  65
  66 #include <string.h>
  67 #include "ec_lcl.h"
  68 #include <openssl/err.h>
  69 #include <string.h>
  70
  71 EC_KEY *EC_KEY_new(void)
  72         {
  73         EC_KEY *ret;
  74
  75         ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY));
  76         if (ret == NULL)
  77                 {
  78                 ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE);
  79                 return(NULL);
  80                 }
  81
  82         ret->version = 1;
  83         ret->flags = 0;
  84         ret->group   = NULL;
  85         ret->pub_key = NULL;
  86         ret->priv_key= NULL;
  87         ret->enc_flag= 0;
  88         ret->nonce_from_hash_flag = 0;
  89         ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
  90         ret->references= 1;
  91         ret->method_data = NULL;
  92         return(ret);
  93         }
  94
  95 EC_KEY *EC_KEY_new_by_curve_name(int nid)
  96         {
  97         EC_KEY *ret = EC_KEY_new();
  98         if (ret == NULL)
  99                 return NULL;
 100         ret->group = EC_GROUP_new_by_curve_name(nid);
 101         if (ret->group == NULL)
 102                 {
 103                 EC_KEY_free(ret);
 104                 return NULL;
 105                 }
 106         return ret;
 107         }
 108
 109 void EC_KEY_free(EC_KEY *r)
 110         {
 111         int i;
 112
 113         if (r == NULL) return;
 114
 115         i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC);
 116 #ifdef REF_PRINT
 117         REF_PRINT("EC_KEY",r);
 118 #endif
 119         if (i > 0) return;
 120 #ifdef REF_CHECK
 121         if (i < 0)
 122                 {
 123                 fprintf(stderr,"EC_KEY_free, bad reference count\n");
 124                 abort();
 125                 }
 126 #endif
 127
 128         if (r->group    != NULL)
 129                 EC_GROUP_free(r->group);
 130         if (r->pub_key  != NULL)
 131                 EC_POINT_free(r->pub_key);
 132         if (r->priv_key != NULL)
 133                 BN_clear_free(r->priv_key);
 134
 135         EC_EX_DATA_free_all_data(&r->method_data);
 136
 137         OPENSSL_cleanse((void *)r, sizeof(EC_KEY));
 138
 139         OPENSSL_free(r);
 140         }
 141
 142 EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
 143         {
 144         EC_EXTRA_DATA *d;
 145
 146         if (dest == NULL || src == NULL)
 147                 {
 148                 ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
 149                 return NULL;
 150                 }
 151         /* copy the parameters */
 152         if (src->group)
 153                 {
 154                 const EC_METHOD *meth = EC_GROUP_method_of(src->group);
 155                 /* clear the old group */
 156                 if (dest->group)
 157                         EC_GROUP_free(dest->group);
 158                 dest->group = EC_GROUP_new(meth);
 159                 if (dest->group == NULL)
 160                         return NULL;
 161                 if (!EC_GROUP_copy(dest->group, src->group))
 162                         return NULL;
 163                 }
 164         /*  copy the public key */
 165         if (src->pub_key && src->group)
 166                 {
 167                 if (dest->pub_key)
 168                         EC_POINT_free(dest->pub_key);
 169                 dest->pub_key = EC_POINT_new(src->group);
 170                 if (dest->pub_key == NULL)
 171                         return NULL;
 172                 if (!EC_POINT_copy(dest->pub_key, src->pub_key))
 173                         return NULL;
 174                 }
 175         /* copy the private key */
 176         if (src->priv_key)
 177                 {
 178                 if (dest->priv_key == NULL)
 179                         {
 180                         dest->priv_key = BN_new();
 181                         if (dest->priv_key == NULL)
 182                                 return NULL;
 183                         }
 184                 if (!BN_copy(dest->priv_key, src->priv_key))
 185                         return NULL;
 186                 }
 187         /* copy method/extra data */
 188         EC_EX_DATA_free_all_data(&dest->method_data);
 189
 190         for (d = src->method_data; d != NULL; d = d->next)
 191                 {
 192                 void *t = d->dup_func(d->data);
 193
 194                 if (t == NULL)
 195                         return 0;
 196                 if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func))
 197                         return 0;
 198                 }
 199
 200         /* copy the rest */
 201         dest->enc_flag  = src->enc_flag;
 202         dest->nonce_from_hash_flag = src->nonce_from_hash_flag;
 203         dest->conv_form = src->conv_form;
 204         dest->version   = src->version;
 205         dest->flags = src->flags;
 206
 207         return dest;
 208         }
 209
 210 EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
 211         {
 212         EC_KEY *ret = EC_KEY_new();
 213         if (ret == NULL)
 214                 return NULL;
 215         if (EC_KEY_copy(ret, ec_key) == NULL)
 216                 {
 217                 EC_KEY_free(ret);
 218                 return NULL;
 219                 }
 220         return ret;
 221         }
 222
 223 int EC_KEY_up_ref(EC_KEY *r)
 224         {
 225         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
 226 #ifdef REF_PRINT
 227         REF_PRINT("EC_KEY",r);
 228 #endif
 229 #ifdef REF_CHECK
 230         if (i < 2)
 231                 {
 232                 fprintf(stderr, "EC_KEY_up, bad reference count\n");
 233                 abort();
 234                 }
 235 #endif
 236         return ((i > 1) ? 1 : 0);
 237         }
 238
 239 #ifdef OPENSSL_FIPS
 240
 241 #include <openssl/evp.h>
 242 #include <openssl/fips.h>
 243 #include <openssl/fips_rand.h>
 244
 245 static int fips_check_ec(EC_KEY *key)
 246         {
 247         EVP_PKEY pk;
 248         unsigned char tbs[] = "ECDSA Pairwise Check Data";
 249         pk.type = EVP_PKEY_EC;
 250         pk.pkey.ec = key;
 251
 252         if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE,
 253                                         &pk, tbs, 0, NULL, 0, NULL, 0, NULL))
 254                 {
 255                 FIPSerr(FIPS_F_FIPS_CHECK_EC,FIPS_R_PAIRWISE_TEST_FAILED);
 256                 fips_set_selftest_fail();
 257                 return 0;
 258                 }
 259         return 1;
 260         }
 261
 262 int fips_check_ec_prng(EC_KEY *ec)
 263         {
 264         int bits, strength;
 265         if (!FIPS_module_mode())
 266                 return 1;
 267
 268         if (ec->flags & (EC_FLAG_NON_FIPS_ALLOW|EC_FLAG_FIPS_CHECKED))
 269                 return 1;
 270
 271         if (!ec->group)
 272                 return 1;
 273
 274         bits = BN_num_bits(&ec->group->order);
 275
 276         if (bits < 160)
 277                 {
 278                 FIPSerr(FIPS_F_FIPS_CHECK_EC_PRNG,FIPS_R_KEY_TOO_SHORT);
 279                 return 0;
 280                 }
 281         /* Comparable algorithm strengths: from SP800-57 table 2 */
 282         if (bits >= 512)
 283                 strength = 256;
 284         else if (bits >= 384)
 285                 strength = 192;
 286         else if (bits >= 256)
 287                 strength = 128;
 288         else if (bits >= 224)
 289                 strength = 112;
 290         else
 291                 strength = 80;
 292
 293
 294         if (FIPS_rand_strength() >= strength)
 295                 return 1;
 296
 297         FIPSerr(FIPS_F_FIPS_CHECK_EC_PRNG,FIPS_R_PRNG_STRENGTH_TOO_LOW);
 298         return 0;
 299
 300         }
 301
 302 #endif
 303
 304 int EC_KEY_generate_key(EC_KEY *eckey)
 305         {
 306         int     ok = 0;
 307         BN_CTX  *ctx = NULL;
 308         BIGNUM  *priv_key = NULL, *order = NULL;
 309         EC_POINT *pub_key = NULL;
 310
 311 #ifdef OPENSSL_FIPS
 312         if(FIPS_selftest_failed())
 313                 {
 314                 FIPSerr(FIPS_F_EC_KEY_GENERATE_KEY,FIPS_R_FIPS_SELFTEST_FAILED);
 315                 return 0;
 316                 }
 317 #endif
 318
 319         if (!eckey || !eckey->group)
 320                 {
 321                 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
 322                 return 0;
 323                 }
 324
 325         if ((order = BN_new()) == NULL) goto err;
 326         if ((ctx = BN_CTX_new()) == NULL) goto err;
 327
 328         if (eckey->priv_key == NULL)
 329                 {
 330                 priv_key = BN_new();
 331                 if (priv_key == NULL)
 332                         goto err;
 333                 }
 334         else
 335                 priv_key = eckey->priv_key;
 336
 337         if (!EC_GROUP_get_order(eckey->group, order, ctx))
 338                 goto err;
 339
 340 #ifdef OPENSSL_FIPS
 341         if (!fips_check_ec_prng(eckey))
 342                 goto err;
 343 #endif
 344
 345         do
 346                 if (!BN_rand_range(priv_key, order))
 347                         goto err;
 348         while (BN_is_zero(priv_key));
 349
 350         if (eckey->pub_key == NULL)
 351                 {
 352                 pub_key = EC_POINT_new(eckey->group);
 353                 if (pub_key == NULL)
 354                         goto err;
 355                 }
 356         else
 357                 pub_key = eckey->pub_key;
 358
 359         if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
 360                 goto err;
 361
 362         eckey->priv_key = priv_key;
 363         eckey->pub_key  = pub_key;
 364
 365 #ifdef OPENSSL_FIPS
 366         if(!fips_check_ec(eckey))
 367                 {
 368                 eckey->priv_key = NULL;
 369                 eckey->pub_key  = NULL;
 370                 goto err;
 371                 }
 372 #endif
 373
 374         ok=1;
 375
 376 err:
 377         if (order)
 378                 BN_free(order);
 379         if (pub_key  != NULL && eckey->pub_key  == NULL)
 380                 EC_POINT_free(pub_key);
 381         if (priv_key != NULL && eckey->priv_key == NULL)
 382                 BN_free(priv_key);
 383         if (ctx != NULL)
 384                 BN_CTX_free(ctx);
 385         return(ok);
 386         }
 387
 388 int EC_KEY_check_key(const EC_KEY *eckey)
 389         {
 390         int     ok   = 0;
 391         BN_CTX  *ctx = NULL;
 392         const BIGNUM    *order  = NULL;
 393         EC_POINT *point = NULL;
 394
 395         if (!eckey || !eckey->group || !eckey->pub_key)
 396                 {
 397                 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
 398                 return 0;
 399                 }
 400
 401         if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key))
 402                 {
 403                 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
 404                 goto err;
 405                 }
 406
 407         if ((ctx = BN_CTX_new()) == NULL)
 408                 goto err;
 409         if ((point = EC_POINT_new(eckey->group)) == NULL)
 410                 goto err;
 411
 412         /* testing whether the pub_key is on the elliptic curve */
 413         if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
 414                 {
 415                 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
 416                 goto err;
 417                 }
 418         /* testing whether pub_key * order is the point at infinity */
 419         order = &eckey->group->order;
 420         if (BN_is_zero(order))
 421                 {
 422                 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
 423                 goto err;
 424                 }
 425         if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx))
 426                 {
 427                 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
 428                 goto err;
 429                 }
 430         if (!EC_POINT_is_at_infinity(eckey->group, point))
 431                 {
 432                 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
 433                 goto err;
 434                 }
 435         /* in case the priv_key is present :
 436          * check if generator * priv_key == pub_key
 437          */
 438         if (eckey->priv_key)
 439                 {
 440                 if (BN_cmp(eckey->priv_key, order) >= 0)
 441                         {
 442                         ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
 443                         goto err;
 444                         }
 445                 if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
 446                         NULL, NULL, ctx))
 447                         {
 448                         ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
 449                         goto err;
 450                         }
 451                 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
 452                         ctx) != 0)
 453                         {
 454                         ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
 455                         goto err;
 456                         }
 457                 }
 458         ok = 1;
 459 err:
 460         if (ctx   != NULL)
 461                 BN_CTX_free(ctx);
 462         if (point != NULL)
 463                 EC_POINT_free(point);
 464         return(ok);
 465         }
 466
 467 int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, BIGNUM *y)
 468         {
 469         BN_CTX *ctx = NULL;
 470         BIGNUM *tx, *ty;
 471         EC_POINT *point = NULL;
 472         int ok = 0, tmp_nid, is_char_two = 0;
 473
 474         if (!key || !key->group || !x || !y)
 475                 {
 476                 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
 477                                                 ERR_R_PASSED_NULL_PARAMETER);
 478                 return 0;
 479                 }
 480         ctx = BN_CTX_new();
 481         if (!ctx)
 482                 goto err;
 483
 484         point = EC_POINT_new(key->group);
 485
 486         if (!point)
 487                 goto err;
 488
 489         tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
 490
 491         if (tmp_nid == NID_X9_62_characteristic_two_field)
 492                 is_char_two = 1;
 493
 494         tx = BN_CTX_get(ctx);
 495         ty = BN_CTX_get(ctx);
 496 #ifndef OPENSSL_NO_EC2M
 497         if (is_char_two)
 498                 {
 499                 if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
 500                                                                 x, y, ctx))
 501                         goto err;
 502                 if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
 503                                                                 tx, ty, ctx))
 504                         goto err;
 505                 }
 506         else
 507 #endif
 508                 {
 509                 if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
 510                                                                 x, y, ctx))
 511                         goto err;
 512                 if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
 513                                                                 tx, ty, ctx))
 514                         goto err;
 515                 }
 516         /* Check if retrieved coordinates match originals and are less than
 517          * field order: if not values are out of range.
 518          */
 519         if (BN_cmp(x, tx) || BN_cmp(y, ty)
 520                 || (BN_cmp(x, &key->group->field) >= 0)
 521                 || (BN_cmp(y, &key->group->field) >= 0))
 522                 {
 523                 ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
 524                         EC_R_COORDINATES_OUT_OF_RANGE);
 525                 goto err;
 526                 }
 527
 528         if (!EC_KEY_set_public_key(key, point))
 529                 goto err;
 530
 531         if (EC_KEY_check_key(key) == 0)
 532                 goto err;
 533
 534         ok = 1;
 535
 536         err:
 537         if (ctx)
 538                 BN_CTX_free(ctx);
 539         if (point)
 540                 EC_POINT_free(point);
 541         return ok;
 542
 543         }
 544
 545 const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
 546         {
 547         return key->group;
 548         }
 549
 550 int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
 551         {
 552         if (key->group != NULL)
 553                 EC_GROUP_free(key->group);
 554         key->group = EC_GROUP_dup(group);
 555         return (key->group == NULL) ? 0 : 1;
 556         }
 557
 558 const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
 559         {
 560         return key->priv_key;
 561         }
 562
 563 int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
 564         {
 565         if (key->priv_key)
 566                 BN_clear_free(key->priv_key);
 567         key->priv_key = BN_dup(priv_key);
 568         return (key->priv_key == NULL) ? 0 : 1;
 569         }
 570
 571 const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
 572         {
 573         return key->pub_key;
 574         }
 575
 576 int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
 577         {
 578         if (key->pub_key != NULL)
 579                 EC_POINT_free(key->pub_key);
 580         key->pub_key = EC_POINT_dup(pub_key, key->group);
 581         return (key->pub_key == NULL) ? 0 : 1;
 582         }
 583
 584 unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
 585         {
 586         return key->enc_flag;
 587         }
 588
 589 void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
 590         {
 591         key->enc_flag = flags;
 592         }
 593
 594 int EC_KEY_get_nonce_from_hash(const EC_KEY *key)
 595         {
 596         return key->nonce_from_hash_flag;
 597         }
 598
 599 void EC_KEY_set_nonce_from_hash(EC_KEY *key, int on)
 600         {
 601         key->nonce_from_hash_flag = on != 0;
 602         }
 603
 604 point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
 605         {
 606         return key->conv_form;
 607         }
 608
 609 void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
 610         {
 611         key->conv_form = cform;
 612         if (key->group != NULL)
 613                 EC_GROUP_set_point_conversion_form(key->group, cform);
 614         }
 615
 616 void *EC_KEY_get_key_method_data(EC_KEY *key,
 617         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 618         {
 619         void *ret;
 620
 621         CRYPTO_r_lock(CRYPTO_LOCK_EC);
 622         ret = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
 623         CRYPTO_r_unlock(CRYPTO_LOCK_EC);
 624
 625         return ret;
 626         }
 627
 628 void *EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
 629         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 630         {
 631         EC_EXTRA_DATA *ex_data;
 632
 633         CRYPTO_w_lock(CRYPTO_LOCK_EC);
 634         ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
 635         if (ex_data == NULL)
 636                 EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
 637         CRYPTO_w_unlock(CRYPTO_LOCK_EC);
 638
 639         return ex_data;
 640         }
 641
 642 void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
 643         {
 644         if (key->group != NULL)
 645                 EC_GROUP_set_asn1_flag(key->group, flag);
 646         }
 647
 648 int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
 649         {
 650         if (key->group == NULL)
 651                 return 0;
 652         return EC_GROUP_precompute_mult(key->group, ctx);
 653         }
 654
 655 int EC_KEY_get_flags(const EC_KEY *key)
 656         {
 657         return key->flags;
 658         }
 659
 660 void EC_KEY_set_flags(EC_KEY *key, int flags)
 661         {
 662         key->flags |= flags;
 663         }
 664
 665 void EC_KEY_clear_flags(EC_KEY *key, int flags)
 666         {
 667         key->flags &= ~flags;
 668         }