crypto/openssl-0.9/crypto/ec/ec_lib.c

   1 /* crypto/ec/ec_lib.c */
   2 /*
   3  * Originally written by Bodo Moeller for the OpenSSL project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1998-2003 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  * Binary polynomial ECC support in OpenSSL originally developed by
  61  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
  62  */
  63
  64 #include <string.h>
  65
  66 #include <openssl/err.h>
  67 #include <openssl/opensslv.h>
  68
  69 #include "ec_lcl.h"
  70
  71 static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
  72
  73
  74 /* functions for EC_GROUP objects */
  75
  76 EC_GROUP *EC_GROUP_new(const EC_METHOD *meth)
  77         {
  78         EC_GROUP *ret;
  79
  80         if (meth == NULL)
  81                 {
  82                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_PASSED_NULL_PARAMETER);
  83                 return NULL;
  84                 }
  85         if (meth->group_init == 0)
  86                 {
  87                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
  88                 return NULL;
  89                 }
  90
  91         ret = OPENSSL_malloc(sizeof *ret);
  92         if (ret == NULL)
  93                 {
  94                 ECerr(EC_F_EC_GROUP_NEW, ERR_R_MALLOC_FAILURE);
  95                 return NULL;
  96                 }
  97
  98         ret->meth = meth;
  99
 100         ret->extra_data = NULL;
 101
 102         ret->generator = NULL;
 103         BN_init(&ret->order);
 104         BN_init(&ret->cofactor);
 105
 106         ret->curve_name = 0;
 107         ret->asn1_flag  = 0;
 108         ret->asn1_form  = POINT_CONVERSION_UNCOMPRESSED;
 109
 110         ret->seed = NULL;
 111         ret->seed_len = 0;
 112
 113         if (!meth->group_init(ret))
 114                 {
 115                 OPENSSL_free(ret);
 116                 return NULL;
 117                 }
 118
 119         return ret;
 120         }
 121
 122
 123 void EC_GROUP_free(EC_GROUP *group)
 124         {
 125         if (!group) return;
 126
 127         if (group->meth->group_finish != 0)
 128                 group->meth->group_finish(group);
 129
 130         EC_EX_DATA_free_all_data(&group->extra_data);
 131
 132         if (group->generator != NULL)
 133                 EC_POINT_free(group->generator);
 134         BN_free(&group->order);
 135         BN_free(&group->cofactor);
 136
 137         if (group->seed)
 138                 OPENSSL_free(group->seed);
 139
 140         OPENSSL_free(group);
 141         }
 142
 143
 144 void EC_GROUP_clear_free(EC_GROUP *group)
 145         {
 146         if (!group) return;
 147
 148         if (group->meth->group_clear_finish != 0)
 149                 group->meth->group_clear_finish(group);
 150         else if (group->meth->group_finish != 0)
 151                 group->meth->group_finish(group);
 152
 153         EC_EX_DATA_clear_free_all_data(&group->extra_data);
 154
 155         if (group->generator != NULL)
 156                 EC_POINT_clear_free(group->generator);
 157         BN_clear_free(&group->order);
 158         BN_clear_free(&group->cofactor);
 159
 160         if (group->seed)
 161                 {
 162                 OPENSSL_cleanse(group->seed, group->seed_len);
 163                 OPENSSL_free(group->seed);
 164                 }
 165
 166         OPENSSL_cleanse(group, sizeof *group);
 167         OPENSSL_free(group);
 168         }
 169
 170
 171 int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src)
 172         {
 173         EC_EXTRA_DATA *d;
 174
 175         if (dest->meth->group_copy == 0)
 176                 {
 177                 ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 178                 return 0;
 179                 }
 180         if (dest->meth != src->meth)
 181                 {
 182                 ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS);
 183                 return 0;
 184                 }
 185         if (dest == src)
 186                 return 1;
 187
 188         EC_EX_DATA_free_all_data(&dest->extra_data);
 189
 190         for (d = src->extra_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->extra_data, t, d->dup_func, d->free_func, d->clear_free_func))
 197                         return 0;
 198                 }
 199
 200         if (src->generator != NULL)
 201                 {
 202                 if (dest->generator == NULL)
 203                         {
 204                         dest->generator = EC_POINT_new(dest);
 205                         if (dest->generator == NULL) return 0;
 206                         }
 207                 if (!EC_POINT_copy(dest->generator, src->generator)) return 0;
 208                 }
 209         else
 210                 {
 211                 /* src->generator == NULL */
 212                 if (dest->generator != NULL)
 213                         {
 214                         EC_POINT_clear_free(dest->generator);
 215                         dest->generator = NULL;
 216                         }
 217                 }
 218
 219         if (!BN_copy(&dest->order, &src->order)) return 0;
 220         if (!BN_copy(&dest->cofactor, &src->cofactor)) return 0;
 221
 222         dest->curve_name = src->curve_name;
 223         dest->asn1_flag  = src->asn1_flag;
 224         dest->asn1_form  = src->asn1_form;
 225
 226         if (src->seed)
 227                 {
 228                 if (dest->seed)
 229                         OPENSSL_free(dest->seed);
 230                 dest->seed = OPENSSL_malloc(src->seed_len);
 231                 if (dest->seed == NULL)
 232                         return 0;
 233                 if (!memcpy(dest->seed, src->seed, src->seed_len))
 234                         return 0;
 235                 dest->seed_len = src->seed_len;
 236                 }
 237         else
 238                 {
 239                 if (dest->seed)
 240                         OPENSSL_free(dest->seed);
 241                 dest->seed = NULL;
 242                 dest->seed_len = 0;
 243                 }
 244
 245
 246         return dest->meth->group_copy(dest, src);
 247         }
 248
 249
 250 EC_GROUP *EC_GROUP_dup(const EC_GROUP *a)
 251         {
 252         EC_GROUP *t = NULL;
 253         int ok = 0;
 254
 255         if (a == NULL) return NULL;
 256
 257         if ((t = EC_GROUP_new(a->meth)) == NULL) return(NULL);
 258         if (!EC_GROUP_copy(t, a)) goto err;
 259
 260         ok = 1;
 261
 262   err:
 263         if (!ok)
 264                 {
 265                 if (t) EC_GROUP_free(t);
 266                 return NULL;
 267                 }
 268         else return t;
 269         }
 270
 271
 272 const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group)
 273         {
 274         return group->meth;
 275         }
 276
 277
 278 int EC_METHOD_get_field_type(const EC_METHOD *meth)
 279         {
 280         return meth->field_type;
 281         }
 282
 283
 284 int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, const BIGNUM *order, const BIGNUM *cofactor)
 285         {
 286         if (generator == NULL)
 287                 {
 288                 ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER);
 289                 return 0   ;
 290                 }
 291
 292         if (group->generator == NULL)
 293                 {
 294                 group->generator = EC_POINT_new(group);
 295                 if (group->generator == NULL) return 0;
 296                 }
 297         if (!EC_POINT_copy(group->generator, generator)) return 0;
 298
 299         if (order != NULL)
 300                 { if (!BN_copy(&group->order, order)) return 0; }
 301         else
 302                 BN_zero(&group->order);
 303
 304         if (cofactor != NULL)
 305                 { if (!BN_copy(&group->cofactor, cofactor)) return 0; }
 306         else
 307                 BN_zero(&group->cofactor);
 308
 309         return 1;
 310         }
 311
 312
 313 const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group)
 314         {
 315         return group->generator;
 316         }
 317
 318
 319 int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx)
 320         {
 321         if (!BN_copy(order, &group->order))
 322                 return 0;
 323
 324         return !BN_is_zero(order);
 325         }
 326
 327
 328 int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, BN_CTX *ctx)
 329         {
 330         if (!BN_copy(cofactor, &group->cofactor))
 331                 return 0;
 332
 333         return !BN_is_zero(&group->cofactor);
 334         }
 335
 336
 337 void EC_GROUP_set_curve_name(EC_GROUP *group, int nid)
 338         {
 339         group->curve_name = nid;
 340         }
 341
 342
 343 int EC_GROUP_get_curve_name(const EC_GROUP *group)
 344         {
 345         return group->curve_name;
 346         }
 347
 348
 349 void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag)
 350         {
 351         group->asn1_flag = flag;
 352         }
 353
 354
 355 int EC_GROUP_get_asn1_flag(const EC_GROUP *group)
 356         {
 357         return group->asn1_flag;
 358         }
 359
 360
 361 void EC_GROUP_set_point_conversion_form(EC_GROUP *group,
 362                                         point_conversion_form_t form)
 363         {
 364         group->asn1_form = form;
 365         }
 366
 367
 368 point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP *group)
 369         {
 370         return group->asn1_form;
 371         }
 372
 373
 374 size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len)
 375         {
 376         if (group->seed)
 377                 {
 378                 OPENSSL_free(group->seed);
 379                 group->seed = NULL;
 380                 group->seed_len = 0;
 381                 }
 382
 383         if (!len || !p)
 384                 return 1;
 385
 386         if ((group->seed = OPENSSL_malloc(len)) == NULL)
 387                 return 0;
 388         memcpy(group->seed, p, len);
 389         group->seed_len = len;
 390
 391         return len;
 392         }
 393
 394
 395 unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group)
 396         {
 397         return group->seed;
 398         }
 399
 400
 401 size_t EC_GROUP_get_seed_len(const EC_GROUP *group)
 402         {
 403         return group->seed_len;
 404         }
 405
 406
 407 int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 408         {
 409         if (group->meth->group_set_curve == 0)
 410                 {
 411                 ECerr(EC_F_EC_GROUP_SET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 412                 return 0;
 413                 }
 414         return group->meth->group_set_curve(group, p, a, b, ctx);
 415         }
 416
 417
 418 int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
 419         {
 420         if (group->meth->group_get_curve == 0)
 421                 {
 422                 ECerr(EC_F_EC_GROUP_GET_CURVE_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 423                 return 0;
 424                 }
 425         return group->meth->group_get_curve(group, p, a, b, ctx);
 426         }
 427
 428
 429 int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
 430         {
 431         if (group->meth->group_set_curve == 0)
 432                 {
 433                 ECerr(EC_F_EC_GROUP_SET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 434                 return 0;
 435                 }
 436         return group->meth->group_set_curve(group, p, a, b, ctx);
 437         }
 438
 439
 440 int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, BN_CTX *ctx)
 441         {
 442         if (group->meth->group_get_curve == 0)
 443                 {
 444                 ECerr(EC_F_EC_GROUP_GET_CURVE_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 445                 return 0;
 446                 }
 447         return group->meth->group_get_curve(group, p, a, b, ctx);
 448         }
 449
 450
 451 int EC_GROUP_get_degree(const EC_GROUP *group)
 452         {
 453         if (group->meth->group_get_degree == 0)
 454                 {
 455                 ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 456                 return 0;
 457                 }
 458         return group->meth->group_get_degree(group);
 459         }
 460
 461
 462 int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
 463         {
 464         if (group->meth->group_check_discriminant == 0)
 465                 {
 466                 ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 467                 return 0;
 468                 }
 469         return group->meth->group_check_discriminant(group, ctx);
 470         }
 471
 472
 473 int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx)
 474         {
 475         int    r = 0;
 476         BIGNUM *a1, *a2, *a3, *b1, *b2, *b3;
 477         BN_CTX *ctx_new = NULL;
 478
 479         /* compare the field types*/
 480         if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) !=
 481             EC_METHOD_get_field_type(EC_GROUP_method_of(b)))
 482                 return 1;
 483         /* compare the curve name (if present) */
 484         if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) &&
 485             EC_GROUP_get_curve_name(a) == EC_GROUP_get_curve_name(b))
 486                 return 0;
 487
 488         if (!ctx)
 489                 ctx_new = ctx = BN_CTX_new();
 490         if (!ctx)
 491                 return -1;
 492
 493         BN_CTX_start(ctx);
 494         a1 = BN_CTX_get(ctx);
 495         a2 = BN_CTX_get(ctx);
 496         a3 = BN_CTX_get(ctx);
 497         b1 = BN_CTX_get(ctx);
 498         b2 = BN_CTX_get(ctx);
 499         b3 = BN_CTX_get(ctx);
 500         if (!b3)
 501                 {
 502                 BN_CTX_end(ctx);
 503                 if (ctx_new)
 504                         BN_CTX_free(ctx);
 505                 return -1;
 506                 }
 507
 508         /* XXX This approach assumes that the external representation
 509          * of curves over the same field type is the same.
 510          */
 511         if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) ||
 512             !b->meth->group_get_curve(b, b1, b2, b3, ctx))
 513                 r = 1;
 514
 515         if (r || BN_cmp(a1, b1) || BN_cmp(a2, b2) || BN_cmp(a3, b3))
 516                 r = 1;
 517
 518         /* XXX EC_POINT_cmp() assumes that the methods are equal */
 519         if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a),
 520             EC_GROUP_get0_generator(b), ctx))
 521                 r = 1;
 522
 523         if (!r)
 524                 {
 525                 /* compare the order and cofactor */
 526                 if (!EC_GROUP_get_order(a, a1, ctx) ||
 527                     !EC_GROUP_get_order(b, b1, ctx) ||
 528                     !EC_GROUP_get_cofactor(a, a2, ctx) ||
 529                     !EC_GROUP_get_cofactor(b, b2, ctx))
 530                         {
 531                         BN_CTX_end(ctx);
 532                         if (ctx_new)
 533                                 BN_CTX_free(ctx);
 534                         return -1;
 535                         }
 536                 if (BN_cmp(a1, b1) || BN_cmp(a2, b2))
 537                         r = 1;
 538                 }
 539
 540         BN_CTX_end(ctx);
 541         if (ctx_new)
 542                 BN_CTX_free(ctx);
 543
 544         return r;
 545         }
 546
 547
 548 /* this has 'package' visibility */
 549 int EC_EX_DATA_set_data(EC_EXTRA_DATA **ex_data, void *data,
 550         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 551         {
 552         EC_EXTRA_DATA *d;
 553
 554         if (ex_data == NULL)
 555                 return 0;
 556
 557         for (d = *ex_data; d != NULL; d = d->next)
 558                 {
 559                 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
 560                         {
 561                         ECerr(EC_F_EC_EX_DATA_SET_DATA, EC_R_SLOT_FULL);
 562                         return 0;
 563                         }
 564                 }
 565
 566         if (data == NULL)
 567                 /* no explicit entry needed */
 568                 return 1;
 569
 570         d = OPENSSL_malloc(sizeof *d);
 571         if (d == NULL)
 572                 return 0;
 573
 574         d->data = data;
 575         d->dup_func = dup_func;
 576         d->free_func = free_func;
 577         d->clear_free_func = clear_free_func;
 578
 579         d->next = *ex_data;
 580         *ex_data = d;
 581
 582         return 1;
 583         }
 584
 585 /* this has 'package' visibility */
 586 void *EC_EX_DATA_get_data(const EC_EXTRA_DATA *ex_data,
 587         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 588         {
 589         const EC_EXTRA_DATA *d;
 590
 591         for (d = ex_data; d != NULL; d = d->next)
 592                 {
 593                 if (d->dup_func == dup_func && d->free_func == free_func && d->clear_free_func == clear_free_func)
 594                         return d->data;
 595                 }
 596
 597         return NULL;
 598         }
 599
 600 /* this has 'package' visibility */
 601 void EC_EX_DATA_free_data(EC_EXTRA_DATA **ex_data,
 602         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 603         {
 604         EC_EXTRA_DATA **p;
 605
 606         if (ex_data == NULL)
 607                 return;
 608
 609         for (p = ex_data; *p != NULL; p = &((*p)->next))
 610                 {
 611                 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
 612                         {
 613                         EC_EXTRA_DATA *next = (*p)->next;
 614
 615                         (*p)->free_func((*p)->data);
 616                         OPENSSL_free(*p);
 617
 618                         *p = next;
 619                         return;
 620                         }
 621                 }
 622         }
 623
 624 /* this has 'package' visibility */
 625 void EC_EX_DATA_clear_free_data(EC_EXTRA_DATA **ex_data,
 626         void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
 627         {
 628         EC_EXTRA_DATA **p;
 629
 630         if (ex_data == NULL)
 631                 return;
 632
 633         for (p = ex_data; *p != NULL; p = &((*p)->next))
 634                 {
 635                 if ((*p)->dup_func == dup_func && (*p)->free_func == free_func && (*p)->clear_free_func == clear_free_func)
 636                         {
 637                         EC_EXTRA_DATA *next = (*p)->next;
 638
 639                         (*p)->clear_free_func((*p)->data);
 640                         OPENSSL_free(*p);
 641
 642                         *p = next;
 643                         return;
 644                         }
 645                 }
 646         }
 647
 648 /* this has 'package' visibility */
 649 void EC_EX_DATA_free_all_data(EC_EXTRA_DATA **ex_data)
 650         {
 651         EC_EXTRA_DATA *d;
 652
 653         if (ex_data == NULL)
 654                 return;
 655
 656         d = *ex_data;
 657         while (d)
 658                 {
 659                 EC_EXTRA_DATA *next = d->next;
 660
 661                 d->free_func(d->data);
 662                 OPENSSL_free(d);
 663
 664                 d = next;
 665                 }
 666         *ex_data = NULL;
 667         }
 668
 669 /* this has 'package' visibility */
 670 void EC_EX_DATA_clear_free_all_data(EC_EXTRA_DATA **ex_data)
 671         {
 672         EC_EXTRA_DATA *d;
 673
 674         if (ex_data == NULL)
 675                 return;
 676
 677         d = *ex_data;
 678         while (d)
 679                 {
 680                 EC_EXTRA_DATA *next = d->next;
 681
 682                 d->clear_free_func(d->data);
 683                 OPENSSL_free(d);
 684
 685                 d = next;
 686                 }
 687         *ex_data = NULL;
 688         }
 689
 690
 691 /* functions for EC_POINT objects */
 692
 693 EC_POINT *EC_POINT_new(const EC_GROUP *group)
 694         {
 695         EC_POINT *ret;
 696
 697         if (group == NULL)
 698                 {
 699                 ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER);
 700                 return NULL;
 701                 }
 702         if (group->meth->point_init == 0)
 703                 {
 704                 ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 705                 return NULL;
 706                 }
 707
 708         ret = OPENSSL_malloc(sizeof *ret);
 709         if (ret == NULL)
 710                 {
 711                 ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE);
 712                 return NULL;
 713                 }
 714
 715         ret->meth = group->meth;
 716
 717         if (!ret->meth->point_init(ret))
 718                 {
 719                 OPENSSL_free(ret);
 720                 return NULL;
 721                 }
 722
 723         return ret;
 724         }
 725
 726
 727 void EC_POINT_free(EC_POINT *point)
 728         {
 729         if (!point) return;
 730
 731         if (point->meth->point_finish != 0)
 732                 point->meth->point_finish(point);
 733         OPENSSL_free(point);
 734         }
 735
 736
 737 void EC_POINT_clear_free(EC_POINT *point)
 738         {
 739         if (!point) return;
 740
 741         if (point->meth->point_clear_finish != 0)
 742                 point->meth->point_clear_finish(point);
 743         else if (point->meth != NULL && point->meth->point_finish != 0)
 744                 point->meth->point_finish(point);
 745         OPENSSL_cleanse(point, sizeof *point);
 746         OPENSSL_free(point);
 747         }
 748
 749
 750 int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src)
 751         {
 752         if (dest->meth->point_copy == 0)
 753                 {
 754                 ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 755                 return 0;
 756                 }
 757         if (dest->meth != src->meth)
 758                 {
 759                 ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS);
 760                 return 0;
 761                 }
 762         if (dest == src)
 763                 return 1;
 764         return dest->meth->point_copy(dest, src);
 765         }
 766
 767
 768 EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group)
 769         {
 770         EC_POINT *t;
 771         int r;
 772
 773         if (a == NULL) return NULL;
 774
 775         t = EC_POINT_new(group);
 776         if (t == NULL) return(NULL);
 777         r = EC_POINT_copy(t, a);
 778         if (!r)
 779                 {
 780                 EC_POINT_free(t);
 781                 return NULL;
 782                 }
 783         else return t;
 784         }
 785
 786
 787 const EC_METHOD *EC_POINT_method_of(const EC_POINT *point)
 788         {
 789         return point->meth;
 790         }
 791
 792
 793 int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point)
 794         {
 795         if (group->meth->point_set_to_infinity == 0)
 796                 {
 797                 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 798                 return 0;
 799                 }
 800         if (group->meth != point->meth)
 801                 {
 802                 ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
 803                 return 0;
 804                 }
 805         return group->meth->point_set_to_infinity(group, point);
 806         }
 807
 808
 809 int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 810         const BIGNUM *x, const BIGNUM *y, const BIGNUM *z, BN_CTX *ctx)
 811         {
 812         if (group->meth->point_set_Jprojective_coordinates_GFp == 0)
 813                 {
 814                 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 815                 return 0;
 816                 }
 817         if (group->meth != point->meth)
 818                 {
 819                 ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 820                 return 0;
 821                 }
 822         return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
 823         }
 824
 825
 826 int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
 827         BIGNUM *x, BIGNUM *y, BIGNUM *z, BN_CTX *ctx)
 828         {
 829         if (group->meth->point_get_Jprojective_coordinates_GFp == 0)
 830                 {
 831                 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 832                 return 0;
 833                 }
 834         if (group->meth != point->meth)
 835                 {
 836                 ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 837                 return 0;
 838                 }
 839         return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, y, z, ctx);
 840         }
 841
 842
 843 int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 844         const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
 845         {
 846         if (group->meth->point_set_affine_coordinates == 0)
 847                 {
 848                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 849                 return 0;
 850                 }
 851         if (group->meth != point->meth)
 852                 {
 853                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 854                 return 0;
 855                 }
 856         return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
 857         }
 858
 859
 860 int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
 861         const BIGNUM *x, const BIGNUM *y, BN_CTX *ctx)
 862         {
 863         if (group->meth->point_set_affine_coordinates == 0)
 864                 {
 865                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 866                 return 0;
 867                 }
 868         if (group->meth != point->meth)
 869                 {
 870                 ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
 871                 return 0;
 872                 }
 873         return group->meth->point_set_affine_coordinates(group, point, x, y, ctx);
 874         }
 875
 876
 877 int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, const EC_POINT *point,
 878         BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
 879         {
 880         if (group->meth->point_get_affine_coordinates == 0)
 881                 {
 882                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 883                 return 0;
 884                 }
 885         if (group->meth != point->meth)
 886                 {
 887                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 888                 return 0;
 889                 }
 890         return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
 891         }
 892
 893
 894 int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, const EC_POINT *point,
 895         BIGNUM *x, BIGNUM *y, BN_CTX *ctx)
 896         {
 897         if (group->meth->point_get_affine_coordinates == 0)
 898                 {
 899                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 900                 return 0;
 901                 }
 902         if (group->meth != point->meth)
 903                 {
 904                 ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
 905                 return 0;
 906                 }
 907         return group->meth->point_get_affine_coordinates(group, point, x, y, ctx);
 908         }
 909
 910
 911 int EC_POINT_set_compressed_coordinates_GFp(const EC_GROUP *group, EC_POINT *point,
 912         const BIGNUM *x, int y_bit, BN_CTX *ctx)
 913         {
 914         if (group->meth->point_set_compressed_coordinates == 0)
 915                 {
 916                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 917                 return 0;
 918                 }
 919         if (group->meth != point->meth)
 920                 {
 921                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GFP, EC_R_INCOMPATIBLE_OBJECTS);
 922                 return 0;
 923                 }
 924         return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
 925         }
 926
 927
 928 int EC_POINT_set_compressed_coordinates_GF2m(const EC_GROUP *group, EC_POINT *point,
 929         const BIGNUM *x, int y_bit, BN_CTX *ctx)
 930         {
 931         if (group->meth->point_set_compressed_coordinates == 0)
 932                 {
 933                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 934                 return 0;
 935                 }
 936         if (group->meth != point->meth)
 937                 {
 938                 ECerr(EC_F_EC_POINT_SET_COMPRESSED_COORDINATES_GF2M, EC_R_INCOMPATIBLE_OBJECTS);
 939                 return 0;
 940                 }
 941         return group->meth->point_set_compressed_coordinates(group, point, x, y_bit, ctx);
 942         }
 943
 944
 945 size_t EC_POINT_point2oct(const EC_GROUP *group, const EC_POINT *point, point_conversion_form_t form,
 946         unsigned char *buf, size_t len, BN_CTX *ctx)
 947         {
 948         if (group->meth->point2oct == 0)
 949                 {
 950                 ECerr(EC_F_EC_POINT_POINT2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 951                 return 0;
 952                 }
 953         if (group->meth != point->meth)
 954                 {
 955                 ECerr(EC_F_EC_POINT_POINT2OCT, EC_R_INCOMPATIBLE_OBJECTS);
 956                 return 0;
 957                 }
 958         return group->meth->point2oct(group, point, form, buf, len, ctx);
 959         }
 960
 961
 962 int EC_POINT_oct2point(const EC_GROUP *group, EC_POINT *point,
 963         const unsigned char *buf, size_t len, BN_CTX *ctx)
 964         {
 965         if (group->meth->oct2point == 0)
 966                 {
 967                 ECerr(EC_F_EC_POINT_OCT2POINT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 968                 return 0;
 969                 }
 970         if (group->meth != point->meth)
 971                 {
 972                 ECerr(EC_F_EC_POINT_OCT2POINT, EC_R_INCOMPATIBLE_OBJECTS);
 973                 return 0;
 974                 }
 975         return group->meth->oct2point(group, point, buf, len, ctx);
 976         }
 977
 978
 979 int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
 980         {
 981         if (group->meth->add == 0)
 982                 {
 983                 ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
 984                 return 0;
 985                 }
 986         if ((group->meth != r->meth) || (r->meth != a->meth) || (a->meth != b->meth))
 987                 {
 988                 ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS);
 989                 return 0;
 990                 }
 991         return group->meth->add(group, r, a, b, ctx);
 992         }
 993
 994
 995 int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, BN_CTX *ctx)
 996         {
 997         if (group->meth->dbl == 0)
 998                 {
 999                 ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1000                 return 0;
1001                 }
1002         if ((group->meth != r->meth) || (r->meth != a->meth))
1003                 {
1004                 ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS);
1005                 return 0;
1006                 }
1007         return group->meth->dbl(group, r, a, ctx);
1008         }
1009
1010
1011 int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx)
1012         {
1013         if (group->meth->dbl == 0)
1014                 {
1015                 ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1016                 return 0;
1017                 }
1018         if (group->meth != a->meth)
1019                 {
1020                 ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS);
1021                 return 0;
1022                 }
1023         return group->meth->invert(group, a, ctx);
1024         }
1025
1026
1027 int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point)
1028         {
1029         if (group->meth->is_at_infinity == 0)
1030                 {
1031                 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1032                 return 0;
1033                 }
1034         if (group->meth != point->meth)
1035                 {
1036                 ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS);
1037                 return 0;
1038                 }
1039         return group->meth->is_at_infinity(group, point);
1040         }
1041
1042
1043 int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, BN_CTX *ctx)
1044         {
1045         if (group->meth->is_on_curve == 0)
1046                 {
1047                 ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1048                 return 0;
1049                 }
1050         if (group->meth != point->meth)
1051                 {
1052                 ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS);
1053                 return 0;
1054                 }
1055         return group->meth->is_on_curve(group, point, ctx);
1056         }
1057
1058
1059 int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, BN_CTX *ctx)
1060         {
1061         if (group->meth->point_cmp == 0)
1062                 {
1063                 ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1064                 return 0;
1065                 }
1066         if ((group->meth != a->meth) || (a->meth != b->meth))
1067                 {
1068                 ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS);
1069                 return 0;
1070                 }
1071         return group->meth->point_cmp(group, a, b, ctx);
1072         }
1073
1074
1075 int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
1076         {
1077         if (group->meth->make_affine == 0)
1078                 {
1079                 ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1080                 return 0;
1081                 }
1082         if (group->meth != point->meth)
1083                 {
1084                 ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1085                 return 0;
1086                 }
1087         return group->meth->make_affine(group, point, ctx);
1088         }
1089
1090
1091 int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, EC_POINT *points[], BN_CTX *ctx)
1092         {
1093         size_t i;
1094
1095         if (group->meth->points_make_affine == 0)
1096                 {
1097                 ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
1098                 return 0;
1099                 }
1100         for (i = 0; i < num; i++)
1101                 {
1102                 if (group->meth != points[i]->meth)
1103                         {
1104                         ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS);
1105                         return 0;
1106                         }
1107                 }
1108         return group->meth->points_make_affine(group, num, points, ctx);
1109         }
1110
1111
1112 /* Functions for point multiplication.
1113  *
1114  * If group->meth->mul is 0, we use the wNAF-based implementations in ec_mult.c;
1115  * otherwise we dispatch through methods.
1116  */
1117
1118 int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
1119         size_t num, const EC_POINT *points[], const BIGNUM *scalars[], BN_CTX *ctx)
1120         {
1121         if (group->meth->mul == 0)
1122                 /* use default */
1123                 return ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
1124
1125         return group->meth->mul(group, r, scalar, num, points, scalars, ctx);
1126         }
1127
1128 int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar,
1129         const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx)
1130         {
1131         /* just a convenient interface to EC_POINTs_mul() */
1132
1133         const EC_POINT *points[1];
1134         const BIGNUM *scalars[1];
1135
1136         points[0] = point;
1137         scalars[0] = p_scalar;
1138
1139         return EC_POINTs_mul(group, r, g_scalar, (point != NULL && p_scalar != NULL), points, scalars, ctx);
1140         }
1141
1142 int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
1143         {
1144         if (group->meth->mul == 0)
1145                 /* use default */
1146                 return ec_wNAF_precompute_mult(group, ctx);
1147
1148         if (group->meth->precompute_mult != 0)
1149                 return group->meth->precompute_mult(group, ctx);
1150         else
1151                 return 1; /* nothing to do, so report success */
1152         }
1153
1154 int EC_GROUP_have_precompute_mult(const EC_GROUP *group)
1155         {
1156         if (group->meth->mul == 0)
1157                 /* use default */
1158                 return ec_wNAF_have_precompute_mult(group);
1159
1160         if (group->meth->have_precompute_mult != 0)
1161                 return group->meth->have_precompute_mult(group);
1162         else
1163                 return 0; /* cannot tell whether precomputation has been performed */
1164         }